| 1 | /** |
| 2 | * Copyright (c) Meta Platforms, Inc. and affiliates. |
| 3 | * |
| 4 | * This source code is licensed under the MIT license found in the |
| 5 | * LICENSE file in the root directory of this source tree. |
| 6 | * |
| 7 | * @emails react-core |
| 8 | */ |
| 9 | |
| 10 | 'use strict'; |
| 11 | |
| 12 | let React; |
| 13 | let ReactDOMClient; |
| 14 | let ReactFreshRuntime; |
| 15 | let Scheduler; |
| 16 | let act; |
| 17 | let assertLog; |
| 18 | |
| 19 | const babel = require('@babel/core'); |
| 20 | const freshPlugin = require('react-refresh/babel'); |
| 21 | const ts = require('typescript'); |
| 22 | |
| 23 | describe('ReactFreshIntegration', () => { |
| 24 | let container; |
| 25 | let root; |
| 26 | let exportsObj; |
| 27 | |
| 28 | beforeEach(() => { |
| 29 | if (__DEV__) { |
| 30 | jest.resetModules(); |
| 31 | React = require('react'); |
| 32 | ReactFreshRuntime = require('react-refresh/runtime'); |
| 33 | ReactFreshRuntime.injectIntoGlobalHook(global); |
| 34 | ReactDOMClient = require('react-dom/client'); |
| 35 | Scheduler = require('scheduler/unstable_mock'); |
| 36 | ({act, assertLog} = require('internal-test-utils')); |
| 37 | container = document.createElement('div'); |
| 38 | document.body.appendChild(container); |
| 39 | root = ReactDOMClient.createRoot(container); |
| 40 | exportsObj = undefined; |
| 41 | } |
| 42 | }); |
| 43 | |
| 44 | afterEach(() => { |
| 45 | if (__DEV__) { |
| 46 | root.unmount(); |
| 47 | // Ensure we don't leak memory by holding onto dead roots. |
| 48 | expect(ReactFreshRuntime._getMountedRootCount()).toBe(0); |
| 49 | document.body.removeChild(container); |
| 50 | } |
| 51 | }); |
| 52 | |
| 53 | function executeJavaScript(source, compileDestructuring) { |
| 54 | const compiled = babel.transform(source, { |
| 55 | babelrc: false, |
| 56 | presets: ['@babel/react'], |
| 57 | plugins: [ |
| 58 | [freshPlugin, {skipEnvCheck: true}], |
| 59 | '@babel/plugin-transform-modules-commonjs', |
| 60 | compileDestructuring && '@babel/plugin-transform-destructuring', |
| 61 | ].filter(Boolean), |
| 62 | }).code; |
| 63 | return executeCompiled(compiled); |
| 64 | } |
| 65 | |
| 66 | function executeTypescript(source) { |
| 67 | const typescriptSource = babel.transform(source, { |
| 68 | babelrc: false, |
| 69 | configFile: false, |
| 70 | presets: ['@babel/react'], |
| 71 | plugins: [ |
| 72 | [freshPlugin, {skipEnvCheck: true}], |
| 73 | ['@babel/plugin-syntax-typescript', {isTSX: true}], |
| 74 | ], |
| 75 | }).code; |
| 76 | const compiled = ts.transpileModule(typescriptSource, { |
| 77 | module: ts.ModuleKind.CommonJS, |
| 78 | }).outputText; |
| 79 | return executeCompiled(compiled); |
| 80 | } |
| 81 | |
| 82 | function executeCompiled(compiled) { |
| 83 | exportsObj = {}; |
| 84 | // eslint-disable-next-line no-new-func |
| 85 | new Function( |
| 86 | 'global', |
| 87 | 'require', |
| 88 | 'React', |
| 89 | 'Scheduler', |
| 90 | 'exports', |
| 91 | '$RefreshReg$', |
| 92 | '$RefreshSig$', |
| 93 | compiled, |
| 94 | )( |
| 95 | global, |
| 96 | require, |
| 97 | React, |
| 98 | Scheduler, |
| 99 | exportsObj, |
| 100 | $RefreshReg$, |
| 101 | $RefreshSig$, |
| 102 | ); |
| 103 | // Module systems will register exports as a fallback. |
| 104 | // This is useful for cases when e.g. a class is exported, |
| 105 | // and we don't want to propagate the update beyond this module. |
| 106 | $RefreshReg$(exportsObj.default, 'exports.default'); |
| 107 | return exportsObj.default; |
| 108 | } |
| 109 | |
| 110 | function $RefreshReg$(type, id) { |
| 111 | ReactFreshRuntime.register(type, id); |
| 112 | } |
| 113 | |
| 114 | function $RefreshSig$() { |
| 115 | return ReactFreshRuntime.createSignatureFunctionForTransform(); |
| 116 | } |
| 117 | |
| 118 | describe.each([ |
| 119 | [ |
| 120 | 'JavaScript syntax with destructuring enabled', |
| 121 | source => executeJavaScript(source, true), |
| 122 | testJavaScript, |
| 123 | ], |
| 124 | [ |
| 125 | 'JavaScript syntax with destructuring disabled', |
| 126 | source => executeJavaScript(source, false), |
| 127 | testJavaScript, |
| 128 | ], |
| 129 | ['TypeScript syntax', executeTypescript, testTypeScript], |
| 130 | ])('%s', (language, execute, runTest) => { |
| 131 | async function render(source) { |
| 132 | const Component = execute(source); |
| 133 | await act(() => { |
| 134 | root.render(<Component />); |
| 135 | }); |
| 136 | // Module initialization shouldn't be counted as a hot update. |
| 137 | expect(ReactFreshRuntime.performReactRefresh()).toBe(null); |
| 138 | } |
| 139 | |
| 140 | async function patch(source) { |
| 141 | const prevExports = exportsObj; |
| 142 | execute(source); |
| 143 | const nextExports = exportsObj; |
| 144 | |
| 145 | // Check if exported families have changed. |
| 146 | // (In a real module system we'd do this for *all* exports.) |
| 147 | // For example, this can happen if you convert a class to a function. |
| 148 | // Or if you wrap something in a HOC. |
| 149 | const didExportsChange = |
| 150 | ReactFreshRuntime.getFamilyByType(prevExports.default) !== |
| 151 | ReactFreshRuntime.getFamilyByType(nextExports.default); |
| 152 | if (didExportsChange) { |
| 153 | // In a real module system, we would propagate such updates upwards, |
| 154 | // and re-execute modules that imported this one. (Just like if we edited them.) |
| 155 | // This makes adding/removing/renaming exports re-render references to them. |
| 156 | // Here, we'll just force a re-render using the newer type to emulate this. |
| 157 | const NextComponent = nextExports.default; |
| 158 | await act(() => { |
| 159 | root.render(<NextComponent />); |
| 160 | }); |
| 161 | } |
| 162 | await act(() => { |
| 163 | const result = ReactFreshRuntime.performReactRefresh(); |
| 164 | if (!didExportsChange) { |
| 165 | // Normally we expect that some components got updated in our tests. |
| 166 | expect(result).not.toBe(null); |
| 167 | } else { |
| 168 | // However, we have tests where we convert functions to classes, |
| 169 | // and in those cases it's expected nothing would get updated. |
| 170 | // (Instead, the export change branch above would take care of it.) |
| 171 | } |
| 172 | }); |
| 173 | expect(ReactFreshRuntime._getMountedRootCount()).toBe(1); |
| 174 | } |
| 175 | |
| 176 | runTest(render, patch); |
| 177 | }); |
| 178 | |
| 179 | function testJavaScript(render, patch) { |
| 180 | it('reloads function declarations', async () => { |
| 181 | if (__DEV__) { |
| 182 | await render(` |
| 183 | function Parent() { |
| 184 | return <Child prop="A" />; |
| 185 | }; |
| 186 | |
| 187 | function Child({prop}) { |
| 188 | return <h1>{prop}1</h1>; |
| 189 | }; |
| 190 | |
| 191 | export default Parent; |
| 192 | `); |
| 193 | const el = container.firstChild; |
| 194 | expect(el.textContent).toBe('A1'); |
| 195 | await patch(` |
| 196 | function Parent() { |
| 197 | return <Child prop="B" />; |
| 198 | }; |
| 199 | |
| 200 | function Child({prop}) { |
| 201 | return <h1>{prop}2</h1>; |
| 202 | }; |
| 203 | |
| 204 | export default Parent; |
| 205 | `); |
| 206 | expect(container.firstChild).toBe(el); |
| 207 | expect(el.textContent).toBe('B2'); |
| 208 | } |
| 209 | }); |
| 210 | |
| 211 | it('reloads arrow functions', async () => { |
| 212 | if (__DEV__) { |
| 213 | await render(` |
| 214 | const Parent = () => { |
| 215 | return <Child prop="A" />; |
| 216 | }; |
| 217 | |
| 218 | const Child = ({prop}) => { |
| 219 | return <h1>{prop}1</h1>; |
| 220 | }; |
| 221 | |
| 222 | export default Parent; |
| 223 | `); |
| 224 | const el = container.firstChild; |
| 225 | expect(el.textContent).toBe('A1'); |
| 226 | await patch(` |
| 227 | const Parent = () => { |
| 228 | return <Child prop="B" />; |
| 229 | }; |
| 230 | |
| 231 | const Child = ({prop}) => { |
| 232 | return <h1>{prop}2</h1>; |
| 233 | }; |
| 234 | |
| 235 | export default Parent; |
| 236 | `); |
| 237 | expect(container.firstChild).toBe(el); |
| 238 | expect(el.textContent).toBe('B2'); |
| 239 | } |
| 240 | }); |
| 241 | |
| 242 | it('reloads a combination of memo and forwardRef', async () => { |
| 243 | if (__DEV__) { |
| 244 | await render(` |
| 245 | const {memo} = React; |
| 246 | |
| 247 | const Parent = memo(React.forwardRef(function (props, ref) { |
| 248 | return <Child prop="A" ref={ref} />; |
| 249 | })); |
| 250 | |
| 251 | const Child = React.memo(({prop}) => { |
| 252 | return <h1>{prop}1</h1>; |
| 253 | }); |
| 254 | |
| 255 | export default React.memo(Parent); |
| 256 | `); |
| 257 | const el = container.firstChild; |
| 258 | expect(el.textContent).toBe('A1'); |
| 259 | await patch(` |
| 260 | const {memo} = React; |
| 261 | |
| 262 | const Parent = memo(React.forwardRef(function (props, ref) { |
| 263 | return <Child prop="B" ref={ref} />; |
| 264 | })); |
| 265 | |
| 266 | const Child = React.memo(({prop}) => { |
| 267 | return <h1>{prop}2</h1>; |
| 268 | }); |
| 269 | |
| 270 | export default React.memo(Parent); |
| 271 | `); |
| 272 | expect(container.firstChild).toBe(el); |
| 273 | expect(el.textContent).toBe('B2'); |
| 274 | } |
| 275 | }); |
| 276 | |
| 277 | it('reloads default export with named memo', async () => { |
| 278 | if (__DEV__) { |
| 279 | await render(` |
| 280 | const {memo} = React; |
| 281 | |
| 282 | const Child = React.memo(({prop}) => { |
| 283 | return <h1>{prop}1</h1>; |
| 284 | }); |
| 285 | |
| 286 | export default memo(React.forwardRef(function Parent(props, ref) { |
| 287 | return <Child prop="A" ref={ref} />; |
| 288 | })); |
| 289 | `); |
| 290 | const el = container.firstChild; |
| 291 | expect(el.textContent).toBe('A1'); |
| 292 | await patch(` |
| 293 | const {memo} = React; |
| 294 | |
| 295 | const Child = React.memo(({prop}) => { |
| 296 | return <h1>{prop}2</h1>; |
| 297 | }); |
| 298 | |
| 299 | export default memo(React.forwardRef(function Parent(props, ref) { |
| 300 | return <Child prop="B" ref={ref} />; |
| 301 | })); |
| 302 | `); |
| 303 | expect(container.firstChild).toBe(el); |
| 304 | expect(el.textContent).toBe('B2'); |
| 305 | } |
| 306 | }); |
| 307 | |
| 308 | // @gate __DEV__ |
| 309 | it('ignores ref for class component in hidden subtree', async () => { |
| 310 | const code = ` |
| 311 | import {Activity} from 'react'; |
| 312 | |
| 313 | // Avoid creating a new class on Fast Refresh. |
| 314 | global.A = global.A ?? class A extends React.Component { |
| 315 | render() { |
| 316 | return <div />; |
| 317 | } |
| 318 | } |
| 319 | const A = global.A; |
| 320 | |
| 321 | function hiddenRef() { |
| 322 | throw new Error('Unexpected hiddenRef() invocation.'); |
| 323 | } |
| 324 | |
| 325 | export default function App() { |
| 326 | return ( |
| 327 | <Activity mode="hidden"> |
| 328 | <A ref={hiddenRef} /> |
| 329 | </Activity> |
| 330 | ); |
| 331 | }; |
| 332 | `; |
| 333 | |
| 334 | await render(code); |
| 335 | await patch(code); |
| 336 | }); |
| 337 | |
| 338 | // @gate __DEV__ |
| 339 | it('ignores ref for hoistable resource in hidden subtree', async () => { |
| 340 | const code = ` |
| 341 | import {Activity} from 'react'; |
| 342 | |
| 343 | function hiddenRef() { |
| 344 | throw new Error('Unexpected hiddenRef() invocation.'); |
| 345 | } |
| 346 | |
| 347 | export default function App() { |
| 348 | return ( |
| 349 | <Activity mode="hidden"> |
| 350 | <link rel="preload" href="foo" ref={hiddenRef} /> |
| 351 | </Activity> |
| 352 | ); |
| 353 | }; |
| 354 | `; |
| 355 | |
| 356 | await render(code); |
| 357 | await patch(code); |
| 358 | }); |
| 359 | |
| 360 | // @gate __DEV__ |
| 361 | it('ignores ref for host component in hidden subtree', async () => { |
| 362 | const code = ` |
| 363 | import {Activity} from 'react'; |
| 364 | |
| 365 | function hiddenRef() { |
| 366 | throw new Error('Unexpected hiddenRef() invocation.'); |
| 367 | } |
| 368 | |
| 369 | export default function App() { |
| 370 | return ( |
| 371 | <Activity mode="hidden"> |
| 372 | <div ref={hiddenRef} /> |
| 373 | </Activity> |
| 374 | ); |
| 375 | }; |
| 376 | `; |
| 377 | |
| 378 | await render(code); |
| 379 | await patch(code); |
| 380 | }); |
| 381 | |
| 382 | // @gate __DEV__ |
| 383 | it('ignores ref for Activity in hidden subtree', async () => { |
| 384 | const code = ` |
| 385 | import {Activity} from 'react'; |
| 386 | |
| 387 | function hiddenRef(value) { |
| 388 | throw new Error('Unexpected hiddenRef() invocation.'); |
| 389 | } |
| 390 | |
| 391 | export default function App() { |
| 392 | return ( |
| 393 | <Activity mode="hidden"> |
| 394 | <Activity mode="visible" ref={hiddenRef}> |
| 395 | <div /> |
| 396 | </Activity> |
| 397 | </Activity> |
| 398 | ); |
| 399 | }; |
| 400 | `; |
| 401 | |
| 402 | await render(code); |
| 403 | await patch(code); |
| 404 | }); |
| 405 | |
| 406 | // @gate __DEV__ |
| 407 | it('ignores ref for Scope in hidden subtree', async () => { |
| 408 | const code = ` |
| 409 | import { |
| 410 | Activity, |
| 411 | unstable_Scope as Scope, |
| 412 | } from 'react'; |
| 413 | |
| 414 | function hiddenRef(value) { |
| 415 | throw new Error('Unexpected hiddenRef() invocation.'); |
| 416 | } |
| 417 | |
| 418 | export default function App() { |
| 419 | return ( |
| 420 | <Activity mode="hidden"> |
| 421 | <Scope ref={hiddenRef}> |
| 422 | <div /> |
| 423 | </Scope> |
| 424 | </Activity> |
| 425 | ); |
| 426 | }; |
| 427 | `; |
| 428 | |
| 429 | await render(code); |
| 430 | await patch(code); |
| 431 | }); |
| 432 | |
| 433 | // @gate __DEV__ |
| 434 | it('ignores ref for functional component in hidden subtree', async () => { |
| 435 | const code = ` |
| 436 | import {Activity} from 'react'; |
| 437 | |
| 438 | // Avoid creating a new component on Fast Refresh. |
| 439 | global.A = global.A ?? function A() { |
| 440 | return <div />; |
| 441 | } |
| 442 | const A = global.A; |
| 443 | |
| 444 | function hiddenRef() { |
| 445 | throw new Error('Unexpected hiddenRef() invocation.'); |
| 446 | } |
| 447 | |
| 448 | export default function App() { |
| 449 | return ( |
| 450 | <Activity mode="hidden"> |
| 451 | <A ref={hiddenRef} /> |
| 452 | </Activity> |
| 453 | ); |
| 454 | }; |
| 455 | `; |
| 456 | |
| 457 | await render(code); |
| 458 | await patch(code); |
| 459 | }); |
| 460 | |
| 461 | // @gate __DEV__ |
| 462 | it('ignores ref for ref forwarding component in hidden subtree', async () => { |
| 463 | const code = ` |
| 464 | import { |
| 465 | forwardRef, |
| 466 | Activity, |
| 467 | } from 'react'; |
| 468 | |
| 469 | // Avoid creating a new component on Fast Refresh. |
| 470 | global.A = global.A ?? forwardRef(function A(props, ref) { |
| 471 | return <div ref={ref} />; |
| 472 | }); |
| 473 | const A = global.A; |
| 474 | |
| 475 | function hiddenRef() { |
| 476 | throw new Error('Unexpected hiddenRef() invocation.'); |
| 477 | } |
| 478 | |
| 479 | export default function App() { |
| 480 | return ( |
| 481 | <Activity mode="hidden"> |
| 482 | <A ref={hiddenRef} /> |
| 483 | </Activity> |
| 484 | ); |
| 485 | }; |
| 486 | `; |
| 487 | |
| 488 | await render(code); |
| 489 | await patch(code); |
| 490 | }); |
| 491 | |
| 492 | // @gate __DEV__ |
| 493 | it('ignores ref for simple memo component in hidden subtree', async () => { |
| 494 | const code = ` |
| 495 | import { |
| 496 | memo, |
| 497 | Activity, |
| 498 | } from 'react'; |
| 499 | |
| 500 | // Avoid creating a new component on Fast Refresh. |
| 501 | global.A = global.A ?? memo(function A() { |
| 502 | return <div />; |
| 503 | }); |
| 504 | const A = global.A; |
| 505 | |
| 506 | function hiddenRef() { |
| 507 | throw new Error('Unexpected hiddenRef() invocation.'); |
| 508 | } |
| 509 | |
| 510 | export default function App() { |
| 511 | return ( |
| 512 | <Activity mode="hidden"> |
| 513 | <A ref={hiddenRef} /> |
| 514 | </Activity> |
| 515 | ); |
| 516 | }; |
| 517 | `; |
| 518 | |
| 519 | await render(code); |
| 520 | await patch(code); |
| 521 | }); |
| 522 | |
| 523 | // @gate __DEV__ |
| 524 | it('ignores ref for memo component in hidden subtree', async () => { |
| 525 | // A custom compare function means this won't use SimpleMemoComponent. |
| 526 | const code = ` |
| 527 | import { |
| 528 | memo, |
| 529 | Activity, |
| 530 | } from 'react'; |
| 531 | |
| 532 | // Avoid creating a new component on Fast Refresh. |
| 533 | global.A = global.A ?? memo( |
| 534 | function A() { |
| 535 | return <div />; |
| 536 | }, |
| 537 | () => false, |
| 538 | ); |
| 539 | const A = global.A; |
| 540 | |
| 541 | function hiddenRef() { |
| 542 | throw new Error('Unexpected hiddenRef() invocation.'); |
| 543 | } |
| 544 | |
| 545 | export default function App() { |
| 546 | return ( |
| 547 | <Activity mode="hidden"> |
| 548 | <A ref={hiddenRef} /> |
| 549 | </Activity> |
| 550 | ); |
| 551 | }; |
| 552 | `; |
| 553 | |
| 554 | await render(code); |
| 555 | await patch(code); |
| 556 | }); |
| 557 | |
| 558 | it('reloads HOCs if they return functions', async () => { |
| 559 | if (__DEV__) { |
| 560 | await render(` |
| 561 | function hoc(letter) { |
| 562 | return function() { |
| 563 | return <h1>{letter}1</h1>; |
| 564 | } |
| 565 | } |
| 566 | |
| 567 | export default function Parent() { |
| 568 | return <Child />; |
| 569 | } |
| 570 | |
| 571 | const Child = hoc('A'); |
| 572 | `); |
| 573 | const el = container.firstChild; |
| 574 | expect(el.textContent).toBe('A1'); |
| 575 | await patch(` |
| 576 | function hoc(letter) { |
| 577 | return function() { |
| 578 | return <h1>{letter}2</h1>; |
| 579 | } |
| 580 | } |
| 581 | |
| 582 | export default function Parent() { |
| 583 | return React.createElement(Child); |
| 584 | } |
| 585 | |
| 586 | const Child = hoc('B'); |
| 587 | `); |
| 588 | expect(container.firstChild).toBe(el); |
| 589 | expect(el.textContent).toBe('B2'); |
| 590 | } |
| 591 | }); |
| 592 | |
| 593 | it('resets state when renaming a state variable', async () => { |
| 594 | if (__DEV__) { |
| 595 | await render(` |
| 596 | const {useState} = React; |
| 597 | const S = 1; |
| 598 | |
| 599 | export default function App() { |
| 600 | const [foo, setFoo] = useState(S); |
| 601 | return <h1>A{foo}</h1>; |
| 602 | } |
| 603 | `); |
| 604 | const el = container.firstChild; |
| 605 | expect(el.textContent).toBe('A1'); |
| 606 | |
| 607 | await patch(` |
| 608 | const {useState} = React; |
| 609 | const S = 2; |
| 610 | |
| 611 | export default function App() { |
| 612 | const [foo, setFoo] = useState(S); |
| 613 | return <h1>B{foo}</h1>; |
| 614 | } |
| 615 | `); |
| 616 | // Same state variable name, so state is preserved. |
| 617 | expect(container.firstChild).toBe(el); |
| 618 | expect(el.textContent).toBe('B1'); |
| 619 | |
| 620 | await patch(` |
| 621 | const {useState} = React; |
| 622 | const S = 3; |
| 623 | |
| 624 | export default function App() { |
| 625 | const [bar, setBar] = useState(S); |
| 626 | return <h1>C{bar}</h1>; |
| 627 | } |
| 628 | `); |
| 629 | // Different state variable name, so state is reset. |
| 630 | expect(container.firstChild).not.toBe(el); |
| 631 | const newEl = container.firstChild; |
| 632 | expect(newEl.textContent).toBe('C3'); |
| 633 | } |
| 634 | }); |
| 635 | |
| 636 | it('resets state when renaming a state variable in a HOC', async () => { |
| 637 | if (__DEV__) { |
| 638 | await render(` |
| 639 | const {useState} = React; |
| 640 | const S = 1; |
| 641 | |
| 642 | function hoc(Wrapped) { |
| 643 | return function Generated() { |
| 644 | const [foo, setFoo] = useState(S); |
| 645 | return <Wrapped value={foo} />; |
| 646 | }; |
| 647 | } |
| 648 | |
| 649 | export default hoc(({ value }) => { |
| 650 | return <h1>A{value}</h1>; |
| 651 | }); |
| 652 | `); |
| 653 | const el = container.firstChild; |
| 654 | expect(el.textContent).toBe('A1'); |
| 655 | |
| 656 | await patch(` |
| 657 | const {useState} = React; |
| 658 | const S = 2; |
| 659 | |
| 660 | function hoc(Wrapped) { |
| 661 | return function Generated() { |
| 662 | const [foo, setFoo] = useState(S); |
| 663 | return <Wrapped value={foo} />; |
| 664 | }; |
| 665 | } |
| 666 | |
| 667 | export default hoc(({ value }) => { |
| 668 | return <h1>B{value}</h1>; |
| 669 | }); |
| 670 | `); |
| 671 | // Same state variable name, so state is preserved. |
| 672 | expect(container.firstChild).toBe(el); |
| 673 | expect(el.textContent).toBe('B1'); |
| 674 | |
| 675 | await patch(` |
| 676 | const {useState} = React; |
| 677 | const S = 3; |
| 678 | |
| 679 | function hoc(Wrapped) { |
| 680 | return function Generated() { |
| 681 | const [bar, setBar] = useState(S); |
| 682 | return <Wrapped value={bar} />; |
| 683 | }; |
| 684 | } |
| 685 | |
| 686 | export default hoc(({ value }) => { |
| 687 | return <h1>C{value}</h1>; |
| 688 | }); |
| 689 | `); |
| 690 | // Different state variable name, so state is reset. |
| 691 | expect(container.firstChild).not.toBe(el); |
| 692 | const newEl = container.firstChild; |
| 693 | expect(newEl.textContent).toBe('C3'); |
| 694 | } |
| 695 | }); |
| 696 | |
| 697 | it('resets state when renaming a state variable in a HOC with indirection', async () => { |
| 698 | if (__DEV__) { |
| 699 | await render(` |
| 700 | const {useState} = React; |
| 701 | const S = 1; |
| 702 | |
| 703 | function hoc(Wrapped) { |
| 704 | return function Generated() { |
| 705 | const [foo, setFoo] = useState(S); |
| 706 | return <Wrapped value={foo} />; |
| 707 | }; |
| 708 | } |
| 709 | |
| 710 | function Indirection({ value }) { |
| 711 | return <h1>A{value}</h1>; |
| 712 | } |
| 713 | |
| 714 | export default hoc(Indirection); |
| 715 | `); |
| 716 | const el = container.firstChild; |
| 717 | expect(el.textContent).toBe('A1'); |
| 718 | |
| 719 | await patch(` |
| 720 | const {useState} = React; |
| 721 | const S = 2; |
| 722 | |
| 723 | function hoc(Wrapped) { |
| 724 | return function Generated() { |
| 725 | const [foo, setFoo] = useState(S); |
| 726 | return <Wrapped value={foo} />; |
| 727 | }; |
| 728 | } |
| 729 | |
| 730 | function Indirection({ value }) { |
| 731 | return <h1>B{value}</h1>; |
| 732 | } |
| 733 | |
| 734 | export default hoc(Indirection); |
| 735 | `); |
| 736 | // Same state variable name, so state is preserved. |
| 737 | expect(container.firstChild).toBe(el); |
| 738 | expect(el.textContent).toBe('B1'); |
| 739 | |
| 740 | await patch(` |
| 741 | const {useState} = React; |
| 742 | const S = 3; |
| 743 | |
| 744 | function hoc(Wrapped) { |
| 745 | return function Generated() { |
| 746 | const [bar, setBar] = useState(S); |
| 747 | return <Wrapped value={bar} />; |
| 748 | }; |
| 749 | } |
| 750 | |
| 751 | function Indirection({ value }) { |
| 752 | return <h1>C{value}</h1>; |
| 753 | } |
| 754 | |
| 755 | export default hoc(Indirection); |
| 756 | `); |
| 757 | // Different state variable name, so state is reset. |
| 758 | expect(container.firstChild).not.toBe(el); |
| 759 | const newEl = container.firstChild; |
| 760 | expect(newEl.textContent).toBe('C3'); |
| 761 | } |
| 762 | }); |
| 763 | |
| 764 | it('resets state when renaming a state variable inside a HOC with direct call', async () => { |
| 765 | if (__DEV__) { |
| 766 | await render(` |
| 767 | const {useState} = React; |
| 768 | const S = 1; |
| 769 | |
| 770 | function hocWithDirectCall(Wrapped) { |
| 771 | return function Generated() { |
| 772 | return Wrapped(); |
| 773 | }; |
| 774 | } |
| 775 | |
| 776 | export default hocWithDirectCall(() => { |
| 777 | const [foo, setFoo] = useState(S); |
| 778 | return <h1>A{foo}</h1>; |
| 779 | }); |
| 780 | `); |
| 781 | const el = container.firstChild; |
| 782 | expect(el.textContent).toBe('A1'); |
| 783 | |
| 784 | await patch(` |
| 785 | const {useState} = React; |
| 786 | const S = 2; |
| 787 | |
| 788 | function hocWithDirectCall(Wrapped) { |
| 789 | return function Generated() { |
| 790 | return Wrapped(); |
| 791 | }; |
| 792 | } |
| 793 | |
| 794 | export default hocWithDirectCall(() => { |
| 795 | const [foo, setFoo] = useState(S); |
| 796 | return <h1>B{foo}</h1>; |
| 797 | }); |
| 798 | `); |
| 799 | // Same state variable name, so state is preserved. |
| 800 | expect(container.firstChild).toBe(el); |
| 801 | expect(el.textContent).toBe('B1'); |
| 802 | |
| 803 | await patch(` |
| 804 | const {useState} = React; |
| 805 | const S = 3; |
| 806 | |
| 807 | function hocWithDirectCall(Wrapped) { |
| 808 | return function Generated() { |
| 809 | return Wrapped(); |
| 810 | }; |
| 811 | } |
| 812 | |
| 813 | export default hocWithDirectCall(() => { |
| 814 | const [bar, setBar] = useState(S); |
| 815 | return <h1>C{bar}</h1>; |
| 816 | }); |
| 817 | `); |
| 818 | // Different state variable name, so state is reset. |
| 819 | expect(container.firstChild).not.toBe(el); |
| 820 | const newEl = container.firstChild; |
| 821 | expect(newEl.textContent).toBe('C3'); |
| 822 | } |
| 823 | }); |
| 824 | |
| 825 | it('does not crash when changing Hook order inside a HOC with direct call', async () => { |
| 826 | if (__DEV__) { |
| 827 | await render(` |
| 828 | const {useEffect} = React; |
| 829 | |
| 830 | function hocWithDirectCall(Wrapped) { |
| 831 | return function Generated() { |
| 832 | return Wrapped(); |
| 833 | }; |
| 834 | } |
| 835 | |
| 836 | export default hocWithDirectCall(() => { |
| 837 | useEffect(() => {}, []); |
| 838 | return <h1>A</h1>; |
| 839 | }); |
| 840 | `); |
| 841 | const el = container.firstChild; |
| 842 | expect(el.textContent).toBe('A'); |
| 843 | |
| 844 | await patch(` |
| 845 | const {useEffect} = React; |
| 846 | |
| 847 | function hocWithDirectCall(Wrapped) { |
| 848 | return function Generated() { |
| 849 | return Wrapped(); |
| 850 | }; |
| 851 | } |
| 852 | |
| 853 | export default hocWithDirectCall(() => { |
| 854 | useEffect(() => {}, []); |
| 855 | useEffect(() => {}, []); |
| 856 | return <h1>B</h1>; |
| 857 | }); |
| 858 | `); |
| 859 | // Hook order changed, so we remount. |
| 860 | expect(container.firstChild).not.toBe(el); |
| 861 | const newEl = container.firstChild; |
| 862 | expect(newEl.textContent).toBe('B'); |
| 863 | } |
| 864 | }); |
| 865 | |
| 866 | it('does not crash when changing Hook order inside a memo-ed HOC with direct call', async () => { |
| 867 | if (__DEV__) { |
| 868 | await render(` |
| 869 | const {useEffect, memo} = React; |
| 870 | |
| 871 | function hocWithDirectCall(Wrapped) { |
| 872 | return memo(function Generated() { |
| 873 | return Wrapped(); |
| 874 | }); |
| 875 | } |
| 876 | |
| 877 | export default hocWithDirectCall(() => { |
| 878 | useEffect(() => {}, []); |
| 879 | return <h1>A</h1>; |
| 880 | }); |
| 881 | `); |
| 882 | const el = container.firstChild; |
| 883 | expect(el.textContent).toBe('A'); |
| 884 | |
| 885 | await patch(` |
| 886 | const {useEffect, memo} = React; |
| 887 | |
| 888 | function hocWithDirectCall(Wrapped) { |
| 889 | return memo(function Generated() { |
| 890 | return Wrapped(); |
| 891 | }); |
| 892 | } |
| 893 | |
| 894 | export default hocWithDirectCall(() => { |
| 895 | useEffect(() => {}, []); |
| 896 | useEffect(() => {}, []); |
| 897 | return <h1>B</h1>; |
| 898 | }); |
| 899 | `); |
| 900 | // Hook order changed, so we remount. |
| 901 | expect(container.firstChild).not.toBe(el); |
| 902 | const newEl = container.firstChild; |
| 903 | expect(newEl.textContent).toBe('B'); |
| 904 | } |
| 905 | }); |
| 906 | |
| 907 | it('does not crash when changing Hook order inside a memo+forwardRef-ed HOC with direct call', async () => { |
| 908 | if (__DEV__) { |
| 909 | await render(` |
| 910 | const {useEffect, memo, forwardRef} = React; |
| 911 | |
| 912 | function hocWithDirectCall(Wrapped) { |
| 913 | return memo(forwardRef(function Generated() { |
| 914 | return Wrapped(); |
| 915 | })); |
| 916 | } |
| 917 | |
| 918 | export default hocWithDirectCall(() => { |
| 919 | useEffect(() => {}, []); |
| 920 | return <h1>A</h1>; |
| 921 | }); |
| 922 | `); |
| 923 | const el = container.firstChild; |
| 924 | expect(el.textContent).toBe('A'); |
| 925 | |
| 926 | await patch(` |
| 927 | const {useEffect, memo, forwardRef} = React; |
| 928 | |
| 929 | function hocWithDirectCall(Wrapped) { |
| 930 | return memo(forwardRef(function Generated() { |
| 931 | return Wrapped(); |
| 932 | })); |
| 933 | } |
| 934 | |
| 935 | export default hocWithDirectCall(() => { |
| 936 | useEffect(() => {}, []); |
| 937 | useEffect(() => {}, []); |
| 938 | return <h1>B</h1>; |
| 939 | }); |
| 940 | `); |
| 941 | // Hook order changed, so we remount. |
| 942 | expect(container.firstChild).not.toBe(el); |
| 943 | const newEl = container.firstChild; |
| 944 | expect(newEl.textContent).toBe('B'); |
| 945 | } |
| 946 | }); |
| 947 | |
| 948 | it('does not crash when changing Hook order inside a HOC returning an object', async () => { |
| 949 | if (__DEV__) { |
| 950 | await render(` |
| 951 | const {useEffect} = React; |
| 952 | |
| 953 | function hocWithDirectCall(Wrapped) { |
| 954 | return {Wrapped: Wrapped}; |
| 955 | } |
| 956 | |
| 957 | export default hocWithDirectCall(() => { |
| 958 | useEffect(() => {}, []); |
| 959 | return <h1>A</h1>; |
| 960 | }).Wrapped; |
| 961 | `); |
| 962 | const el = container.firstChild; |
| 963 | expect(el.textContent).toBe('A'); |
| 964 | |
| 965 | await patch(` |
| 966 | const {useEffect} = React; |
| 967 | |
| 968 | function hocWithDirectCall(Wrapped) { |
| 969 | return {Wrapped: Wrapped}; |
| 970 | } |
| 971 | |
| 972 | export default hocWithDirectCall(() => { |
| 973 | useEffect(() => {}, []); |
| 974 | useEffect(() => {}, []); |
| 975 | return <h1>B</h1>; |
| 976 | }).Wrapped; |
| 977 | `); |
| 978 | // Hook order changed, so we remount. |
| 979 | expect(container.firstChild).not.toBe(el); |
| 980 | const newEl = container.firstChild; |
| 981 | expect(newEl.textContent).toBe('B'); |
| 982 | } |
| 983 | }); |
| 984 | |
| 985 | it('resets effects while preserving state', async () => { |
| 986 | if (__DEV__) { |
| 987 | await render(` |
| 988 | const {useState} = React; |
| 989 | |
| 990 | export default function App() { |
| 991 | const [value, setValue] = useState(0); |
| 992 | return <h1>A{value}</h1>; |
| 993 | } |
| 994 | `); |
| 995 | let el = container.firstChild; |
| 996 | expect(el.textContent).toBe('A0'); |
| 997 | |
| 998 | // Add an effect. |
| 999 | await patch(` |
| 1000 | const {useState} = React; |
| 1001 | |
| 1002 | export default function App() { |
| 1003 | const [value, setValue] = useState(0); |
| 1004 | React.useEffect(() => { |
| 1005 | Scheduler.log('B mount'); |
| 1006 | setValue(1) |
| 1007 | return () => { |
| 1008 | Scheduler.log('B unmount'); |
| 1009 | }; |
| 1010 | }, []); |
| 1011 | return <h1>B{value}</h1>; |
| 1012 | } |
| 1013 | `); |
| 1014 | |
| 1015 | // We added an effect, thereby changing Hook order. |
| 1016 | // This causes a remount. |
| 1017 | expect(container.firstChild).not.toBe(el); |
| 1018 | el = container.firstChild; |
| 1019 | expect(el.textContent).toBe('B1'); |
| 1020 | assertLog(['B mount']); |
| 1021 | |
| 1022 | await patch(` |
| 1023 | const {useState} = React; |
| 1024 | |
| 1025 | export default function App() { |
| 1026 | const [value, setValue] = useState(0); |
| 1027 | React.useEffect(() => { |
| 1028 | Scheduler.log('C mount'); |
| 1029 | return () => { |
| 1030 | Scheduler.log('C unmount'); |
| 1031 | }; |
| 1032 | }, []); |
| 1033 | return <h1>C{value}</h1>; |
| 1034 | } |
| 1035 | `); |
| 1036 | // Same Hooks are called, so state is preserved. |
| 1037 | expect(container.firstChild).toBe(el); |
| 1038 | expect(el.textContent).toBe('C1'); |
| 1039 | |
| 1040 | // Effects are always reset, so effect B was unmounted and C was mounted. |
| 1041 | assertLog(['B unmount', 'C mount']); |
| 1042 | |
| 1043 | await patch(` |
| 1044 | const {useState} = React; |
| 1045 | |
| 1046 | export default function App() { |
| 1047 | const [value, setValue] = useState(0); |
| 1048 | return <h1>D{value}</h1>; |
| 1049 | } |
| 1050 | `); |
| 1051 | // Removing the effect changes the signature |
| 1052 | // and causes the component to remount. |
| 1053 | expect(container.firstChild).not.toBe(el); |
| 1054 | el = container.firstChild; |
| 1055 | expect(el.textContent).toBe('D0'); |
| 1056 | assertLog(['C unmount']); |
| 1057 | } |
| 1058 | }); |
| 1059 | |
| 1060 | it('does not get confused when custom hooks are reordered', async () => { |
| 1061 | if (__DEV__) { |
| 1062 | await render(` |
| 1063 | function useFancyState(initialState) { |
| 1064 | return React.useState(initialState); |
| 1065 | } |
| 1066 | |
| 1067 | const App = () => { |
| 1068 | const [x, setX] = useFancyState('X'); |
| 1069 | const [y, setY] = useFancyState('Y'); |
| 1070 | return <h1>A{x}{y}</h1>; |
| 1071 | }; |
| 1072 | |
| 1073 | export default App; |
| 1074 | `); |
| 1075 | let el = container.firstChild; |
| 1076 | expect(el.textContent).toBe('AXY'); |
| 1077 | |
| 1078 | await patch(` |
| 1079 | function useFancyState(initialState) { |
| 1080 | return React.useState(initialState); |
| 1081 | } |
| 1082 | |
| 1083 | const App = () => { |
| 1084 | const [x, setX] = useFancyState('X'); |
| 1085 | const [y, setY] = useFancyState('Y'); |
| 1086 | return <h1>B{x}{y}</h1>; |
| 1087 | }; |
| 1088 | |
| 1089 | export default App; |
| 1090 | `); |
| 1091 | // Same state variables, so no remount. |
| 1092 | expect(container.firstChild).toBe(el); |
| 1093 | expect(el.textContent).toBe('BXY'); |
| 1094 | |
| 1095 | await patch(` |
| 1096 | function useFancyState(initialState) { |
| 1097 | return React.useState(initialState); |
| 1098 | } |
| 1099 | |
| 1100 | const App = () => { |
| 1101 | const [y, setY] = useFancyState('Y'); |
| 1102 | const [x, setX] = useFancyState('X'); |
| 1103 | return <h1>B{x}{y}</h1>; |
| 1104 | }; |
| 1105 | |
| 1106 | export default App; |
| 1107 | `); |
| 1108 | // Hooks were re-ordered. This causes a remount. |
| 1109 | // Therefore, Hook calls don't accidentally share state. |
| 1110 | expect(container.firstChild).not.toBe(el); |
| 1111 | el = container.firstChild; |
| 1112 | expect(el.textContent).toBe('BXY'); |
| 1113 | } |
| 1114 | }); |
| 1115 | |
| 1116 | it('does not get confused when component is called early', async () => { |
| 1117 | if (__DEV__) { |
| 1118 | await render(` |
| 1119 | // This isn't really a valid pattern but it's close enough |
| 1120 | // to simulate what happens when you call ReactDOM.render |
| 1121 | // in the same file. We want to ensure this doesn't confuse |
| 1122 | // the runtime. |
| 1123 | App(); |
| 1124 | |
| 1125 | function App() { |
| 1126 | const [x, setX] = useFancyState('X'); |
| 1127 | const [y, setY] = useFancyState('Y'); |
| 1128 | return <h1>A{x}{y}</h1>; |
| 1129 | }; |
| 1130 | |
| 1131 | function useFancyState(initialState) { |
| 1132 | // No real Hook calls to avoid triggering invalid call invariant. |
| 1133 | // We only want to verify that we can still call this function early. |
| 1134 | return initialState; |
| 1135 | } |
| 1136 | |
| 1137 | export default App; |
| 1138 | `); |
| 1139 | let el = container.firstChild; |
| 1140 | expect(el.textContent).toBe('AXY'); |
| 1141 | |
| 1142 | await patch(` |
| 1143 | // This isn't really a valid pattern but it's close enough |
| 1144 | // to simulate what happens when you call ReactDOM.render |
| 1145 | // in the same file. We want to ensure this doesn't confuse |
| 1146 | // the runtime. |
| 1147 | App(); |
| 1148 | |
| 1149 | function App() { |
| 1150 | const [x, setX] = useFancyState('X'); |
| 1151 | const [y, setY] = useFancyState('Y'); |
| 1152 | return <h1>B{x}{y}</h1>; |
| 1153 | }; |
| 1154 | |
| 1155 | function useFancyState(initialState) { |
| 1156 | // No real Hook calls to avoid triggering invalid call invariant. |
| 1157 | // We only want to verify that we can still call this function early. |
| 1158 | return initialState; |
| 1159 | } |
| 1160 | |
| 1161 | export default App; |
| 1162 | `); |
| 1163 | // Same state variables, so no remount. |
| 1164 | expect(container.firstChild).toBe(el); |
| 1165 | expect(el.textContent).toBe('BXY'); |
| 1166 | |
| 1167 | await patch(` |
| 1168 | // This isn't really a valid pattern but it's close enough |
| 1169 | // to simulate what happens when you call ReactDOM.render |
| 1170 | // in the same file. We want to ensure this doesn't confuse |
| 1171 | // the runtime. |
| 1172 | App(); |
| 1173 | |
| 1174 | function App() { |
| 1175 | const [y, setY] = useFancyState('Y'); |
| 1176 | const [x, setX] = useFancyState('X'); |
| 1177 | return <h1>B{x}{y}</h1>; |
| 1178 | }; |
| 1179 | |
| 1180 | function useFancyState(initialState) { |
| 1181 | // No real Hook calls to avoid triggering invalid call invariant. |
| 1182 | // We only want to verify that we can still call this function early. |
| 1183 | return initialState; |
| 1184 | } |
| 1185 | |
| 1186 | export default App; |
| 1187 | `); |
| 1188 | // Hooks were re-ordered. This causes a remount. |
| 1189 | // Therefore, Hook calls don't accidentally share state. |
| 1190 | expect(container.firstChild).not.toBe(el); |
| 1191 | el = container.firstChild; |
| 1192 | expect(el.textContent).toBe('BXY'); |
| 1193 | } |
| 1194 | }); |
| 1195 | |
| 1196 | it('does not get confused by Hooks defined inline', async () => { |
| 1197 | // This is not a recommended pattern but at least it shouldn't break. |
| 1198 | if (__DEV__) { |
| 1199 | await render(` |
| 1200 | const App = () => { |
| 1201 | const useFancyState = (initialState) => { |
| 1202 | const result = React.useState(initialState); |
| 1203 | return result; |
| 1204 | }; |
| 1205 | const [x, setX] = useFancyState('X1'); |
| 1206 | const [y, setY] = useFancyState('Y1'); |
| 1207 | return <h1>A{x}{y}</h1>; |
| 1208 | }; |
| 1209 | |
| 1210 | export default App; |
| 1211 | `); |
| 1212 | let el = container.firstChild; |
| 1213 | expect(el.textContent).toBe('AX1Y1'); |
| 1214 | |
| 1215 | await patch(` |
| 1216 | const App = () => { |
| 1217 | const useFancyState = (initialState) => { |
| 1218 | const result = React.useState(initialState); |
| 1219 | return result; |
| 1220 | }; |
| 1221 | const [x, setX] = useFancyState('X2'); |
| 1222 | const [y, setY] = useFancyState('Y2'); |
| 1223 | return <h1>B{x}{y}</h1>; |
| 1224 | }; |
| 1225 | |
| 1226 | export default App; |
| 1227 | `); |
| 1228 | // Remount even though nothing changed because |
| 1229 | // the custom Hook is inside -- and so we don't |
| 1230 | // really know whether its signature has changed. |
| 1231 | // We could potentially make it work, but for now |
| 1232 | // let's assert we don't crash with confusing errors. |
| 1233 | expect(container.firstChild).not.toBe(el); |
| 1234 | el = container.firstChild; |
| 1235 | expect(el.textContent).toBe('BX2Y2'); |
| 1236 | } |
| 1237 | }); |
| 1238 | |
| 1239 | it('remounts component if custom hook it uses changes order', async () => { |
| 1240 | if (__DEV__) { |
| 1241 | await render(` |
| 1242 | const App = () => { |
| 1243 | const [x, setX] = useFancyState('X'); |
| 1244 | const [y, setY] = useFancyState('Y'); |
| 1245 | return <h1>A{x}{y}</h1>; |
| 1246 | }; |
| 1247 | |
| 1248 | const useFancyState = (initialState) => { |
| 1249 | const result = useIndirection(initialState); |
| 1250 | return result; |
| 1251 | }; |
| 1252 | |
| 1253 | function useIndirection(initialState) { |
| 1254 | return React.useState(initialState); |
| 1255 | } |
| 1256 | |
| 1257 | export default App; |
| 1258 | `); |
| 1259 | let el = container.firstChild; |
| 1260 | expect(el.textContent).toBe('AXY'); |
| 1261 | |
| 1262 | await patch(` |
| 1263 | const App = () => { |
| 1264 | const [x, setX] = useFancyState('X'); |
| 1265 | const [y, setY] = useFancyState('Y'); |
| 1266 | return <h1>B{x}{y}</h1>; |
| 1267 | }; |
| 1268 | |
| 1269 | const useFancyState = (initialState) => { |
| 1270 | const result = useIndirection(); |
| 1271 | return result; |
| 1272 | }; |
| 1273 | |
| 1274 | function useIndirection(initialState) { |
| 1275 | return React.useState(initialState); |
| 1276 | } |
| 1277 | |
| 1278 | export default App; |
| 1279 | `); |
| 1280 | // We didn't change anything except the header text. |
| 1281 | // So we don't expect a remount. |
| 1282 | expect(container.firstChild).toBe(el); |
| 1283 | expect(el.textContent).toBe('BXY'); |
| 1284 | |
| 1285 | await patch(` |
| 1286 | const App = () => { |
| 1287 | const [x, setX] = useFancyState('X'); |
| 1288 | const [y, setY] = useFancyState('Y'); |
| 1289 | return <h1>C{x}{y}</h1>; |
| 1290 | }; |
| 1291 | |
| 1292 | const useFancyState = (initialState) => { |
| 1293 | const result = useIndirection(initialState); |
| 1294 | return result; |
| 1295 | }; |
| 1296 | |
| 1297 | function useIndirection(initialState) { |
| 1298 | React.useEffect(() => {}); |
| 1299 | return React.useState(initialState); |
| 1300 | } |
| 1301 | |
| 1302 | export default App; |
| 1303 | `); |
| 1304 | // The useIndirection Hook added an affect, |
| 1305 | // so we had to remount the component. |
| 1306 | expect(container.firstChild).not.toBe(el); |
| 1307 | el = container.firstChild; |
| 1308 | expect(el.textContent).toBe('CXY'); |
| 1309 | |
| 1310 | await patch(` |
| 1311 | const App = () => { |
| 1312 | const [x, setX] = useFancyState('X'); |
| 1313 | const [y, setY] = useFancyState('Y'); |
| 1314 | return <h1>D{x}{y}</h1>; |
| 1315 | }; |
| 1316 | |
| 1317 | const useFancyState = (initialState) => { |
| 1318 | const result = useIndirection(); |
| 1319 | return result; |
| 1320 | }; |
| 1321 | |
| 1322 | function useIndirection(initialState) { |
| 1323 | React.useEffect(() => {}); |
| 1324 | return React.useState(initialState); |
| 1325 | } |
| 1326 | |
| 1327 | export default App; |
| 1328 | `); |
| 1329 | // We didn't change anything except the header text. |
| 1330 | // So we don't expect a remount. |
| 1331 | expect(container.firstChild).toBe(el); |
| 1332 | expect(el.textContent).toBe('DXY'); |
| 1333 | } |
| 1334 | }); |
| 1335 | |
| 1336 | it('does not lose the inferred arrow names', async () => { |
| 1337 | if (__DEV__) { |
| 1338 | await render(` |
| 1339 | const Parent = () => { |
| 1340 | return <Child/>; |
| 1341 | }; |
| 1342 | |
| 1343 | const Child = () => { |
| 1344 | useMyThing(); |
| 1345 | return <h1>{Parent.name} {Child.name} {useMyThing.name}</h1>; |
| 1346 | }; |
| 1347 | |
| 1348 | const useMyThing = () => { |
| 1349 | React.useState(); |
| 1350 | }; |
| 1351 | |
| 1352 | export default Parent; |
| 1353 | `); |
| 1354 | expect(container.textContent).toBe('Parent Child useMyThing'); |
| 1355 | } |
| 1356 | }); |
| 1357 | |
| 1358 | it('does not lose the inferred function names', async () => { |
| 1359 | if (__DEV__) { |
| 1360 | await render(` |
| 1361 | var Parent = function() { |
| 1362 | return <Child/>; |
| 1363 | }; |
| 1364 | |
| 1365 | var Child = function() { |
| 1366 | useMyThing(); |
| 1367 | return <h1>{Parent.name} {Child.name} {useMyThing.name}</h1>; |
| 1368 | }; |
| 1369 | |
| 1370 | var useMyThing = function() { |
| 1371 | React.useState(); |
| 1372 | }; |
| 1373 | |
| 1374 | export default Parent; |
| 1375 | `); |
| 1376 | expect(container.textContent).toBe('Parent Child useMyThing'); |
| 1377 | } |
| 1378 | }); |
| 1379 | |
| 1380 | it('resets state on every edit with @refresh reset annotation', async () => { |
| 1381 | if (__DEV__) { |
| 1382 | await render(` |
| 1383 | const {useState} = React; |
| 1384 | const S = 1; |
| 1385 | |
| 1386 | export default function App() { |
| 1387 | const [foo, setFoo] = useState(S); |
| 1388 | return <h1>A{foo}</h1>; |
| 1389 | } |
| 1390 | `); |
| 1391 | let el = container.firstChild; |
| 1392 | expect(el.textContent).toBe('A1'); |
| 1393 | |
| 1394 | await patch(` |
| 1395 | const {useState} = React; |
| 1396 | const S = 2; |
| 1397 | |
| 1398 | export default function App() { |
| 1399 | const [foo, setFoo] = useState(S); |
| 1400 | return <h1>B{foo}</h1>; |
| 1401 | } |
| 1402 | `); |
| 1403 | // Same state variable name, so state is preserved. |
| 1404 | expect(container.firstChild).toBe(el); |
| 1405 | expect(el.textContent).toBe('B1'); |
| 1406 | |
| 1407 | await patch(` |
| 1408 | const {useState} = React; |
| 1409 | const S = 3; |
| 1410 | |
| 1411 | /* @refresh reset */ |
| 1412 | |
| 1413 | export default function App() { |
| 1414 | const [foo, setFoo] = useState(S); |
| 1415 | return <h1>C{foo}</h1>; |
| 1416 | } |
| 1417 | `); |
| 1418 | // Found remount annotation, so state is reset. |
| 1419 | expect(container.firstChild).not.toBe(el); |
| 1420 | el = container.firstChild; |
| 1421 | expect(el.textContent).toBe('C3'); |
| 1422 | |
| 1423 | await patch(` |
| 1424 | const {useState} = React; |
| 1425 | const S = 4; |
| 1426 | |
| 1427 | export default function App() { |
| 1428 | |
| 1429 | // @refresh reset |
| 1430 | |
| 1431 | const [foo, setFoo] = useState(S); |
| 1432 | return <h1>D{foo}</h1>; |
| 1433 | } |
| 1434 | `); |
| 1435 | // Found remount annotation, so state is reset. |
| 1436 | expect(container.firstChild).not.toBe(el); |
| 1437 | el = container.firstChild; |
| 1438 | expect(el.textContent).toBe('D4'); |
| 1439 | |
| 1440 | await patch(` |
| 1441 | const {useState} = React; |
| 1442 | const S = 5; |
| 1443 | |
| 1444 | export default function App() { |
| 1445 | const [foo, setFoo] = useState(S); |
| 1446 | return <h1>E{foo}</h1>; |
| 1447 | } |
| 1448 | `); |
| 1449 | // There is no remount annotation anymore, |
| 1450 | // so preserve the previous state. |
| 1451 | expect(container.firstChild).toBe(el); |
| 1452 | expect(el.textContent).toBe('E4'); |
| 1453 | |
| 1454 | await patch(` |
| 1455 | const {useState} = React; |
| 1456 | const S = 6; |
| 1457 | |
| 1458 | export default function App() { |
| 1459 | const [foo, setFoo] = useState(S); |
| 1460 | return <h1>F{foo}</h1>; |
| 1461 | } |
| 1462 | `); |
| 1463 | // Continue editing. |
| 1464 | expect(container.firstChild).toBe(el); |
| 1465 | expect(el.textContent).toBe('F4'); |
| 1466 | |
| 1467 | await patch(` |
| 1468 | const {useState} = React; |
| 1469 | const S = 7; |
| 1470 | |
| 1471 | export default function App() { |
| 1472 | |
| 1473 | /* @refresh reset */ |
| 1474 | |
| 1475 | const [foo, setFoo] = useState(S); |
| 1476 | return <h1>G{foo}</h1>; |
| 1477 | } |
| 1478 | `); |
| 1479 | // Force remount one last time. |
| 1480 | expect(container.firstChild).not.toBe(el); |
| 1481 | el = container.firstChild; |
| 1482 | expect(el.textContent).toBe('G7'); |
| 1483 | } |
| 1484 | }); |
| 1485 | |
| 1486 | // This is best effort for simple cases. |
| 1487 | // We won't attempt to resolve identifiers. |
| 1488 | it('resets state when useState initial state is edited', async () => { |
| 1489 | if (__DEV__) { |
| 1490 | await render(` |
| 1491 | const {useState} = React; |
| 1492 | |
| 1493 | export default function App() { |
| 1494 | const [foo, setFoo] = useState(1); |
| 1495 | return <h1>A{foo}</h1>; |
| 1496 | } |
| 1497 | `); |
| 1498 | let el = container.firstChild; |
| 1499 | expect(el.textContent).toBe('A1'); |
| 1500 | |
| 1501 | await patch(` |
| 1502 | const {useState} = React; |
| 1503 | |
| 1504 | export default function App() { |
| 1505 | const [foo, setFoo] = useState(1); |
| 1506 | return <h1>B{foo}</h1>; |
| 1507 | } |
| 1508 | `); |
| 1509 | // Same initial state, so it's preserved. |
| 1510 | expect(container.firstChild).toBe(el); |
| 1511 | expect(el.textContent).toBe('B1'); |
| 1512 | |
| 1513 | await patch(` |
| 1514 | const {useState} = React; |
| 1515 | |
| 1516 | export default function App() { |
| 1517 | const [foo, setFoo] = useState(2); |
| 1518 | return <h1>C{foo}</h1>; |
| 1519 | } |
| 1520 | `); |
| 1521 | // Different initial state, so state is reset. |
| 1522 | expect(container.firstChild).not.toBe(el); |
| 1523 | el = container.firstChild; |
| 1524 | expect(el.textContent).toBe('C2'); |
| 1525 | } |
| 1526 | }); |
| 1527 | |
| 1528 | // This is best effort for simple cases. |
| 1529 | // We won't attempt to resolve identifiers. |
| 1530 | it('resets state when useReducer initial state is edited', async () => { |
| 1531 | if (__DEV__) { |
| 1532 | await render(` |
| 1533 | const {useReducer} = React; |
| 1534 | |
| 1535 | export default function App() { |
| 1536 | const [foo, setFoo] = useReducer(x => x, 1); |
| 1537 | return <h1>A{foo}</h1>; |
| 1538 | } |
| 1539 | `); |
| 1540 | let el = container.firstChild; |
| 1541 | expect(el.textContent).toBe('A1'); |
| 1542 | |
| 1543 | await patch(` |
| 1544 | const {useReducer} = React; |
| 1545 | |
| 1546 | export default function App() { |
| 1547 | const [foo, setFoo] = useReducer(x => x, 1); |
| 1548 | return <h1>B{foo}</h1>; |
| 1549 | } |
| 1550 | `); |
| 1551 | // Same initial state, so it's preserved. |
| 1552 | expect(container.firstChild).toBe(el); |
| 1553 | expect(el.textContent).toBe('B1'); |
| 1554 | |
| 1555 | await patch(` |
| 1556 | const {useReducer} = React; |
| 1557 | |
| 1558 | export default function App() { |
| 1559 | const [foo, setFoo] = useReducer(x => x, 2); |
| 1560 | return <h1>C{foo}</h1>; |
| 1561 | } |
| 1562 | `); |
| 1563 | // Different initial state, so state is reset. |
| 1564 | expect(container.firstChild).not.toBe(el); |
| 1565 | el = container.firstChild; |
| 1566 | expect(el.textContent).toBe('C2'); |
| 1567 | } |
| 1568 | }); |
| 1569 | |
| 1570 | it('remounts when switching export from function to class', async () => { |
| 1571 | if (__DEV__) { |
| 1572 | await render(` |
| 1573 | export default function App() { |
| 1574 | return <h1>A1</h1>; |
| 1575 | } |
| 1576 | `); |
| 1577 | let el = container.firstChild; |
| 1578 | expect(el.textContent).toBe('A1'); |
| 1579 | await patch(` |
| 1580 | export default function App() { |
| 1581 | return <h1>A2</h1>; |
| 1582 | } |
| 1583 | `); |
| 1584 | // Keep state. |
| 1585 | expect(container.firstChild).toBe(el); |
| 1586 | expect(el.textContent).toBe('A2'); |
| 1587 | |
| 1588 | await patch(` |
| 1589 | export default class App extends React.Component { |
| 1590 | render() { |
| 1591 | return <h1>B1</h1> |
| 1592 | } |
| 1593 | } |
| 1594 | `); |
| 1595 | // Reset (function -> class). |
| 1596 | expect(container.firstChild).not.toBe(el); |
| 1597 | el = container.firstChild; |
| 1598 | expect(el.textContent).toBe('B1'); |
| 1599 | await patch(` |
| 1600 | export default class App extends React.Component { |
| 1601 | render() { |
| 1602 | return <h1>B2</h1> |
| 1603 | } |
| 1604 | } |
| 1605 | `); |
| 1606 | // Reset (classes always do). |
| 1607 | expect(container.firstChild).not.toBe(el); |
| 1608 | el = container.firstChild; |
| 1609 | expect(el.textContent).toBe('B2'); |
| 1610 | |
| 1611 | await patch(` |
| 1612 | export default function App() { |
| 1613 | return <h1>C1</h1>; |
| 1614 | } |
| 1615 | `); |
| 1616 | // Reset (class -> function). |
| 1617 | expect(container.firstChild).not.toBe(el); |
| 1618 | el = container.firstChild; |
| 1619 | expect(el.textContent).toBe('C1'); |
| 1620 | await patch(` |
| 1621 | export default function App() { |
| 1622 | return <h1>C2</h1>; |
| 1623 | } |
| 1624 | `); |
| 1625 | expect(container.firstChild).toBe(el); |
| 1626 | expect(el.textContent).toBe('C2'); |
| 1627 | |
| 1628 | await patch(` |
| 1629 | export default function App() { |
| 1630 | return <h1>D1</h1>; |
| 1631 | } |
| 1632 | `); |
| 1633 | el = container.firstChild; |
| 1634 | expect(el.textContent).toBe('D1'); |
| 1635 | await patch(` |
| 1636 | export default function App() { |
| 1637 | return <h1>D2</h1>; |
| 1638 | } |
| 1639 | `); |
| 1640 | // Keep state. |
| 1641 | expect(container.firstChild).toBe(el); |
| 1642 | expect(el.textContent).toBe('D2'); |
| 1643 | } |
| 1644 | }); |
| 1645 | |
| 1646 | it('remounts when switching export from class to function', async () => { |
| 1647 | if (__DEV__) { |
| 1648 | await render(` |
| 1649 | export default class App extends React.Component { |
| 1650 | render() { |
| 1651 | return <h1>A1</h1> |
| 1652 | } |
| 1653 | } |
| 1654 | `); |
| 1655 | let el = container.firstChild; |
| 1656 | expect(el.textContent).toBe('A1'); |
| 1657 | await patch(` |
| 1658 | export default class App extends React.Component { |
| 1659 | render() { |
| 1660 | return <h1>A2</h1> |
| 1661 | } |
| 1662 | } |
| 1663 | `); |
| 1664 | // Reset (classes always do). |
| 1665 | expect(container.firstChild).not.toBe(el); |
| 1666 | el = container.firstChild; |
| 1667 | expect(el.textContent).toBe('A2'); |
| 1668 | |
| 1669 | await patch(` |
| 1670 | export default function App() { |
| 1671 | return <h1>B1</h1>; |
| 1672 | } |
| 1673 | `); |
| 1674 | // Reset (class -> function). |
| 1675 | expect(container.firstChild).not.toBe(el); |
| 1676 | el = container.firstChild; |
| 1677 | expect(el.textContent).toBe('B1'); |
| 1678 | await patch(` |
| 1679 | export default function App() { |
| 1680 | return <h1>B2</h1>; |
| 1681 | } |
| 1682 | `); |
| 1683 | // Keep state. |
| 1684 | expect(container.firstChild).toBe(el); |
| 1685 | expect(el.textContent).toBe('B2'); |
| 1686 | |
| 1687 | await patch(` |
| 1688 | export default class App extends React.Component { |
| 1689 | render() { |
| 1690 | return <h1>C1</h1> |
| 1691 | } |
| 1692 | } |
| 1693 | `); |
| 1694 | // Reset (function -> class). |
| 1695 | expect(container.firstChild).not.toBe(el); |
| 1696 | el = container.firstChild; |
| 1697 | expect(el.textContent).toBe('C1'); |
| 1698 | } |
| 1699 | }); |
| 1700 | |
| 1701 | it('remounts when wrapping export in a HOC', async () => { |
| 1702 | if (__DEV__) { |
| 1703 | await render(` |
| 1704 | export default function App() { |
| 1705 | return <h1>A1</h1>; |
| 1706 | } |
| 1707 | `); |
| 1708 | let el = container.firstChild; |
| 1709 | expect(el.textContent).toBe('A1'); |
| 1710 | await patch(` |
| 1711 | export default function App() { |
| 1712 | return <h1>A2</h1>; |
| 1713 | } |
| 1714 | `); |
| 1715 | // Keep state. |
| 1716 | expect(container.firstChild).toBe(el); |
| 1717 | expect(el.textContent).toBe('A2'); |
| 1718 | |
| 1719 | await patch(` |
| 1720 | function hoc(Inner) { |
| 1721 | return function Wrapper() { |
| 1722 | return <Inner />; |
| 1723 | } |
| 1724 | } |
| 1725 | |
| 1726 | function App() { |
| 1727 | return <h1>B1</h1>; |
| 1728 | } |
| 1729 | |
| 1730 | export default hoc(App); |
| 1731 | `); |
| 1732 | // Reset (wrapped in HOC). |
| 1733 | expect(container.firstChild).not.toBe(el); |
| 1734 | el = container.firstChild; |
| 1735 | expect(el.textContent).toBe('B1'); |
| 1736 | await patch(` |
| 1737 | function hoc(Inner) { |
| 1738 | return function Wrapper() { |
| 1739 | return <Inner />; |
| 1740 | } |
| 1741 | } |
| 1742 | |
| 1743 | function App() { |
| 1744 | return <h1>B2</h1>; |
| 1745 | } |
| 1746 | |
| 1747 | export default hoc(App); |
| 1748 | `); |
| 1749 | // Keep state. |
| 1750 | expect(container.firstChild).toBe(el); |
| 1751 | expect(el.textContent).toBe('B2'); |
| 1752 | |
| 1753 | await patch(` |
| 1754 | export default function App() { |
| 1755 | return <h1>C1</h1>; |
| 1756 | } |
| 1757 | `); |
| 1758 | // Reset (unwrapped). |
| 1759 | expect(container.firstChild).not.toBe(el); |
| 1760 | el = container.firstChild; |
| 1761 | expect(el.textContent).toBe('C1'); |
| 1762 | await patch(` |
| 1763 | export default function App() { |
| 1764 | return <h1>C2</h1>; |
| 1765 | } |
| 1766 | `); |
| 1767 | expect(container.firstChild).toBe(el); |
| 1768 | expect(el.textContent).toBe('C2'); |
| 1769 | } |
| 1770 | }); |
| 1771 | |
| 1772 | it('remounts when wrapping export in memo()', async () => { |
| 1773 | if (__DEV__) { |
| 1774 | await render(` |
| 1775 | export default function App() { |
| 1776 | return <h1>A1</h1>; |
| 1777 | } |
| 1778 | `); |
| 1779 | let el = container.firstChild; |
| 1780 | expect(el.textContent).toBe('A1'); |
| 1781 | await patch(` |
| 1782 | export default function App() { |
| 1783 | return <h1>A2</h1>; |
| 1784 | } |
| 1785 | `); |
| 1786 | // Keep state. |
| 1787 | expect(container.firstChild).toBe(el); |
| 1788 | expect(el.textContent).toBe('A2'); |
| 1789 | |
| 1790 | await patch(` |
| 1791 | function App() { |
| 1792 | return <h1>B1</h1>; |
| 1793 | } |
| 1794 | |
| 1795 | export default React.memo(App); |
| 1796 | `); |
| 1797 | // Reset (wrapped in HOC). |
| 1798 | expect(container.firstChild).not.toBe(el); |
| 1799 | el = container.firstChild; |
| 1800 | expect(el.textContent).toBe('B1'); |
| 1801 | await patch(` |
| 1802 | function App() { |
| 1803 | return <h1>B2</h1>; |
| 1804 | } |
| 1805 | |
| 1806 | export default React.memo(App); |
| 1807 | `); |
| 1808 | // Keep state. |
| 1809 | expect(container.firstChild).toBe(el); |
| 1810 | expect(el.textContent).toBe('B2'); |
| 1811 | |
| 1812 | await patch(` |
| 1813 | export default function App() { |
| 1814 | return <h1>C1</h1>; |
| 1815 | } |
| 1816 | `); |
| 1817 | // Reset (unwrapped). |
| 1818 | expect(container.firstChild).not.toBe(el); |
| 1819 | el = container.firstChild; |
| 1820 | expect(el.textContent).toBe('C1'); |
| 1821 | await patch(` |
| 1822 | export default function App() { |
| 1823 | return <h1>C2</h1>; |
| 1824 | } |
| 1825 | `); |
| 1826 | expect(container.firstChild).toBe(el); |
| 1827 | expect(el.textContent).toBe('C2'); |
| 1828 | } |
| 1829 | }); |
| 1830 | |
| 1831 | it('remounts when wrapping export in forwardRef()', async () => { |
| 1832 | if (__DEV__) { |
| 1833 | await render(` |
| 1834 | export default function App() { |
| 1835 | return <h1>A1</h1>; |
| 1836 | } |
| 1837 | `); |
| 1838 | let el = container.firstChild; |
| 1839 | expect(el.textContent).toBe('A1'); |
| 1840 | await patch(` |
| 1841 | export default function App() { |
| 1842 | return <h1>A2</h1>; |
| 1843 | } |
| 1844 | `); |
| 1845 | // Keep state. |
| 1846 | expect(container.firstChild).toBe(el); |
| 1847 | expect(el.textContent).toBe('A2'); |
| 1848 | |
| 1849 | await patch(` |
| 1850 | function App() { |
| 1851 | return <h1>B1</h1>; |
| 1852 | } |
| 1853 | |
| 1854 | export default React.forwardRef(App); |
| 1855 | `); |
| 1856 | // Reset (wrapped in HOC). |
| 1857 | expect(container.firstChild).not.toBe(el); |
| 1858 | el = container.firstChild; |
| 1859 | expect(el.textContent).toBe('B1'); |
| 1860 | await patch(` |
| 1861 | function App() { |
| 1862 | return <h1>B2</h1>; |
| 1863 | } |
| 1864 | |
| 1865 | export default React.forwardRef(App); |
| 1866 | `); |
| 1867 | // Keep state. |
| 1868 | expect(container.firstChild).toBe(el); |
| 1869 | expect(el.textContent).toBe('B2'); |
| 1870 | |
| 1871 | await patch(` |
| 1872 | export default function App() { |
| 1873 | return <h1>C1</h1>; |
| 1874 | } |
| 1875 | `); |
| 1876 | // Reset (unwrapped). |
| 1877 | expect(container.firstChild).not.toBe(el); |
| 1878 | el = container.firstChild; |
| 1879 | expect(el.textContent).toBe('C1'); |
| 1880 | await patch(` |
| 1881 | export default function App() { |
| 1882 | return <h1>C2</h1>; |
| 1883 | } |
| 1884 | `); |
| 1885 | expect(container.firstChild).toBe(el); |
| 1886 | expect(el.textContent).toBe('C2'); |
| 1887 | } |
| 1888 | }); |
| 1889 | |
| 1890 | it('resets useMemoCache cache slots', async () => { |
| 1891 | if (__DEV__) { |
| 1892 | await render(` |
| 1893 | const useMemoCache = require('react/compiler-runtime').c; |
| 1894 | let cacheMisses = 0; |
| 1895 | const cacheMiss = (id) => { |
| 1896 | cacheMisses++; |
| 1897 | return id; |
| 1898 | }; |
| 1899 | export default function App(t0) { |
| 1900 | const $ = useMemoCache(1); |
| 1901 | const {reset1} = t0; |
| 1902 | let t1; |
| 1903 | if ($[0] !== reset1) { |
| 1904 | $[0] = t1 = cacheMiss({reset1}); |
| 1905 | } else { |
| 1906 | t1 = $[1]; |
| 1907 | } |
| 1908 | return <h1>{cacheMisses}</h1>; |
| 1909 | } |
| 1910 | `); |
| 1911 | const el = container.firstChild; |
| 1912 | expect(el.textContent).toBe('1'); |
| 1913 | await patch(` |
| 1914 | const useMemoCache = require('react/compiler-runtime').c; |
| 1915 | let cacheMisses = 0; |
| 1916 | const cacheMiss = (id) => { |
| 1917 | cacheMisses++; |
| 1918 | return id; |
| 1919 | }; |
| 1920 | export default function App(t0) { |
| 1921 | const $ = useMemoCache(2); |
| 1922 | const {reset1, reset2} = t0; |
| 1923 | let t1; |
| 1924 | if ($[0] !== reset1) { |
| 1925 | $[0] = t1 = cacheMiss({reset1}); |
| 1926 | } else { |
| 1927 | t1 = $[1]; |
| 1928 | } |
| 1929 | let t2; |
| 1930 | if ($[1] !== reset2) { |
| 1931 | $[1] = t2 = cacheMiss({reset2}); |
| 1932 | } else { |
| 1933 | t2 = $[1]; |
| 1934 | } |
| 1935 | return <h1>{cacheMisses}</h1>; |
| 1936 | } |
| 1937 | `); |
| 1938 | expect(container.firstChild).toBe(el); |
| 1939 | // cache size changed between refreshes |
| 1940 | expect(el.textContent).toBe('2'); |
| 1941 | } |
| 1942 | }); |
| 1943 | |
| 1944 | describe('with inline requires', () => { |
| 1945 | beforeEach(() => { |
| 1946 | global.FakeModuleSystem = {}; |
| 1947 | }); |
| 1948 | |
| 1949 | afterEach(() => { |
| 1950 | delete global.FakeModuleSystem; |
| 1951 | }); |
| 1952 | |
| 1953 | it('remounts component if custom hook it uses changes order on first edit', async () => { |
| 1954 | // This test verifies that remounting works even if calls to custom Hooks |
| 1955 | // were transformed with an inline requires transform, like we have on RN. |
| 1956 | // Inline requires make it harder to compare previous and next signatures |
| 1957 | // because useFancyState inline require always resolves to the newest version. |
| 1958 | // We're not actually using inline requires in the test, but it has similar semantics. |
| 1959 | if (__DEV__) { |
| 1960 | await render(` |
| 1961 | const FakeModuleSystem = global.FakeModuleSystem; |
| 1962 | |
| 1963 | FakeModuleSystem.useFancyState = function(initialState) { |
| 1964 | return React.useState(initialState); |
| 1965 | }; |
| 1966 | |
| 1967 | const App = () => { |
| 1968 | const [x, setX] = FakeModuleSystem.useFancyState('X'); |
| 1969 | const [y, setY] = FakeModuleSystem.useFancyState('Y'); |
| 1970 | return <h1>A{x}{y}</h1>; |
| 1971 | }; |
| 1972 | |
| 1973 | export default App; |
| 1974 | `); |
| 1975 | let el = container.firstChild; |
| 1976 | expect(el.textContent).toBe('AXY'); |
| 1977 | |
| 1978 | await patch(` |
| 1979 | const FakeModuleSystem = global.FakeModuleSystem; |
| 1980 | |
| 1981 | FakeModuleSystem.useFancyState = function(initialState) { |
| 1982 | React.useEffect(() => {}); |
| 1983 | return React.useState(initialState); |
| 1984 | }; |
| 1985 | |
| 1986 | const App = () => { |
| 1987 | const [x, setX] = FakeModuleSystem.useFancyState('X'); |
| 1988 | const [y, setY] = FakeModuleSystem.useFancyState('Y'); |
| 1989 | return <h1>B{x}{y}</h1>; |
| 1990 | }; |
| 1991 | |
| 1992 | export default App; |
| 1993 | `); |
| 1994 | // The useFancyState Hook added an effect, |
| 1995 | // so we had to remount the component. |
| 1996 | expect(container.firstChild).not.toBe(el); |
| 1997 | el = container.firstChild; |
| 1998 | expect(el.textContent).toBe('BXY'); |
| 1999 | |
| 2000 | await patch(` |
| 2001 | const FakeModuleSystem = global.FakeModuleSystem; |
| 2002 | |
| 2003 | FakeModuleSystem.useFancyState = function(initialState) { |
| 2004 | React.useEffect(() => {}); |
| 2005 | return React.useState(initialState); |
| 2006 | }; |
| 2007 | |
| 2008 | const App = () => { |
| 2009 | const [x, setX] = FakeModuleSystem.useFancyState('X'); |
| 2010 | const [y, setY] = FakeModuleSystem.useFancyState('Y'); |
| 2011 | return <h1>C{x}{y}</h1>; |
| 2012 | }; |
| 2013 | |
| 2014 | export default App; |
| 2015 | `); |
| 2016 | // We didn't change anything except the header text. |
| 2017 | // So we don't expect a remount. |
| 2018 | expect(container.firstChild).toBe(el); |
| 2019 | expect(el.textContent).toBe('CXY'); |
| 2020 | } |
| 2021 | }); |
| 2022 | |
| 2023 | it('remounts component if custom hook it uses changes order on second edit', async () => { |
| 2024 | if (__DEV__) { |
| 2025 | await render(` |
| 2026 | const FakeModuleSystem = global.FakeModuleSystem; |
| 2027 | |
| 2028 | FakeModuleSystem.useFancyState = function(initialState) { |
| 2029 | return React.useState(initialState); |
| 2030 | }; |
| 2031 | |
| 2032 | const App = () => { |
| 2033 | const [x, setX] = FakeModuleSystem.useFancyState('X'); |
| 2034 | const [y, setY] = FakeModuleSystem.useFancyState('Y'); |
| 2035 | return <h1>A{x}{y}</h1>; |
| 2036 | }; |
| 2037 | |
| 2038 | export default App; |
| 2039 | `); |
| 2040 | let el = container.firstChild; |
| 2041 | expect(el.textContent).toBe('AXY'); |
| 2042 | |
| 2043 | await patch(` |
| 2044 | const FakeModuleSystem = global.FakeModuleSystem; |
| 2045 | |
| 2046 | FakeModuleSystem.useFancyState = function(initialState) { |
| 2047 | return React.useState(initialState); |
| 2048 | }; |
| 2049 | |
| 2050 | const App = () => { |
| 2051 | const [x, setX] = FakeModuleSystem.useFancyState('X'); |
| 2052 | const [y, setY] = FakeModuleSystem.useFancyState('Y'); |
| 2053 | return <h1>B{x}{y}</h1>; |
| 2054 | }; |
| 2055 | |
| 2056 | export default App; |
| 2057 | `); |
| 2058 | expect(container.firstChild).toBe(el); |
| 2059 | expect(el.textContent).toBe('BXY'); |
| 2060 | |
| 2061 | await patch(` |
| 2062 | const FakeModuleSystem = global.FakeModuleSystem; |
| 2063 | |
| 2064 | FakeModuleSystem.useFancyState = function(initialState) { |
| 2065 | React.useEffect(() => {}); |
| 2066 | return React.useState(initialState); |
| 2067 | }; |
| 2068 | |
| 2069 | const App = () => { |
| 2070 | const [x, setX] = FakeModuleSystem.useFancyState('X'); |
| 2071 | const [y, setY] = FakeModuleSystem.useFancyState('Y'); |
| 2072 | return <h1>C{x}{y}</h1>; |
| 2073 | }; |
| 2074 | |
| 2075 | export default App; |
| 2076 | `); |
| 2077 | // The useFancyState Hook added an effect, |
| 2078 | // so we had to remount the component. |
| 2079 | expect(container.firstChild).not.toBe(el); |
| 2080 | el = container.firstChild; |
| 2081 | expect(el.textContent).toBe('CXY'); |
| 2082 | |
| 2083 | await patch(` |
| 2084 | const FakeModuleSystem = global.FakeModuleSystem; |
| 2085 | |
| 2086 | FakeModuleSystem.useFancyState = function(initialState) { |
| 2087 | React.useEffect(() => {}); |
| 2088 | return React.useState(initialState); |
| 2089 | }; |
| 2090 | |
| 2091 | const App = () => { |
| 2092 | const [x, setX] = FakeModuleSystem.useFancyState('X'); |
| 2093 | const [y, setY] = FakeModuleSystem.useFancyState('Y'); |
| 2094 | return <h1>D{x}{y}</h1>; |
| 2095 | }; |
| 2096 | |
| 2097 | export default App; |
| 2098 | `); |
| 2099 | // We didn't change anything except the header text. |
| 2100 | // So we don't expect a remount. |
| 2101 | expect(container.firstChild).toBe(el); |
| 2102 | expect(el.textContent).toBe('DXY'); |
| 2103 | } |
| 2104 | }); |
| 2105 | |
| 2106 | it('recovers if evaluating Hook list throws', async () => { |
| 2107 | if (__DEV__) { |
| 2108 | await render(` |
| 2109 | let FakeModuleSystem = null; |
| 2110 | |
| 2111 | global.FakeModuleSystem.useFancyState = function(initialState) { |
| 2112 | return React.useState(initialState); |
| 2113 | }; |
| 2114 | |
| 2115 | const App = () => { |
| 2116 | FakeModuleSystem = global.FakeModuleSystem; |
| 2117 | const [x, setX] = FakeModuleSystem.useFancyState('X'); |
| 2118 | const [y, setY] = FakeModuleSystem.useFancyState('Y'); |
| 2119 | return <h1>A{x}{y}</h1>; |
| 2120 | }; |
| 2121 | |
| 2122 | export default App; |
| 2123 | `); |
| 2124 | let el = container.firstChild; |
| 2125 | expect(el.textContent).toBe('AXY'); |
| 2126 | |
| 2127 | await patch(` |
| 2128 | let FakeModuleSystem = null; |
| 2129 | |
| 2130 | global.FakeModuleSystem.useFancyState = function(initialState) { |
| 2131 | React.useEffect(() => {}); |
| 2132 | return React.useState(initialState); |
| 2133 | }; |
| 2134 | |
| 2135 | const App = () => { |
| 2136 | FakeModuleSystem = global.FakeModuleSystem; |
| 2137 | const [x, setX] = FakeModuleSystem.useFancyState('X'); |
| 2138 | const [y, setY] = FakeModuleSystem.useFancyState('Y'); |
| 2139 | return <h1>B{x}{y}</h1>; |
| 2140 | }; |
| 2141 | |
| 2142 | export default App; |
| 2143 | `); |
| 2144 | // We couldn't evaluate the Hook signatures |
| 2145 | // so we had to remount the component. |
| 2146 | expect(container.firstChild).not.toBe(el); |
| 2147 | el = container.firstChild; |
| 2148 | expect(el.textContent).toBe('BXY'); |
| 2149 | } |
| 2150 | }); |
| 2151 | |
| 2152 | it('remounts component if custom hook it uses changes order behind an indirection', async () => { |
| 2153 | if (__DEV__) { |
| 2154 | await render(` |
| 2155 | const FakeModuleSystem = global.FakeModuleSystem; |
| 2156 | |
| 2157 | FakeModuleSystem.useFancyState = function(initialState) { |
| 2158 | return FakeModuleSystem.useIndirection(initialState); |
| 2159 | }; |
| 2160 | |
| 2161 | FakeModuleSystem.useIndirection = function(initialState) { |
| 2162 | return FakeModuleSystem.useOtherIndirection(initialState); |
| 2163 | }; |
| 2164 | |
| 2165 | FakeModuleSystem.useOtherIndirection = function(initialState) { |
| 2166 | return React.useState(initialState); |
| 2167 | }; |
| 2168 | |
| 2169 | const App = () => { |
| 2170 | const [x, setX] = FakeModuleSystem.useFancyState('X'); |
| 2171 | const [y, setY] = FakeModuleSystem.useFancyState('Y'); |
| 2172 | return <h1>A{x}{y}</h1>; |
| 2173 | }; |
| 2174 | |
| 2175 | export default App; |
| 2176 | `); |
| 2177 | let el = container.firstChild; |
| 2178 | expect(el.textContent).toBe('AXY'); |
| 2179 | |
| 2180 | await patch(` |
| 2181 | const FakeModuleSystem = global.FakeModuleSystem; |
| 2182 | |
| 2183 | FakeModuleSystem.useFancyState = function(initialState) { |
| 2184 | return FakeModuleSystem.useIndirection(initialState); |
| 2185 | }; |
| 2186 | |
| 2187 | FakeModuleSystem.useIndirection = function(initialState) { |
| 2188 | return FakeModuleSystem.useOtherIndirection(initialState); |
| 2189 | }; |
| 2190 | |
| 2191 | FakeModuleSystem.useOtherIndirection = function(initialState) { |
| 2192 | React.useEffect(() => {}); |
| 2193 | return React.useState(initialState); |
| 2194 | }; |
| 2195 | |
| 2196 | const App = () => { |
| 2197 | const [x, setX] = FakeModuleSystem.useFancyState('X'); |
| 2198 | const [y, setY] = FakeModuleSystem.useFancyState('Y'); |
| 2199 | return <h1>B{x}{y}</h1>; |
| 2200 | }; |
| 2201 | |
| 2202 | export default App; |
| 2203 | `); |
| 2204 | |
| 2205 | // The useFancyState Hook added an effect, |
| 2206 | // so we had to remount the component. |
| 2207 | expect(container.firstChild).not.toBe(el); |
| 2208 | el = container.firstChild; |
| 2209 | expect(el.textContent).toBe('BXY'); |
| 2210 | |
| 2211 | await patch(` |
| 2212 | const FakeModuleSystem = global.FakeModuleSystem; |
| 2213 | |
| 2214 | FakeModuleSystem.useFancyState = function(initialState) { |
| 2215 | return FakeModuleSystem.useIndirection(initialState); |
| 2216 | }; |
| 2217 | |
| 2218 | FakeModuleSystem.useIndirection = function(initialState) { |
| 2219 | return FakeModuleSystem.useOtherIndirection(initialState); |
| 2220 | }; |
| 2221 | |
| 2222 | FakeModuleSystem.useOtherIndirection = function(initialState) { |
| 2223 | React.useEffect(() => {}); |
| 2224 | return React.useState(initialState); |
| 2225 | }; |
| 2226 | |
| 2227 | const App = () => { |
| 2228 | const [x, setX] = FakeModuleSystem.useFancyState('X'); |
| 2229 | const [y, setY] = FakeModuleSystem.useFancyState('Y'); |
| 2230 | return <h1>C{x}{y}</h1>; |
| 2231 | }; |
| 2232 | |
| 2233 | export default App; |
| 2234 | `); |
| 2235 | // We didn't change anything except the header text. |
| 2236 | // So we don't expect a remount. |
| 2237 | expect(container.firstChild).toBe(el); |
| 2238 | expect(el.textContent).toBe('CXY'); |
| 2239 | } |
| 2240 | }); |
| 2241 | }); |
| 2242 | } |
| 2243 | |
| 2244 | function testTypeScript(render, patch) { |
| 2245 | it('reloads component exported in typescript namespace', async () => { |
| 2246 | if (__DEV__) { |
| 2247 | await render(` |
| 2248 | namespace Foo { |
| 2249 | export namespace Bar { |
| 2250 | export const Child = ({prop}) => { |
| 2251 | return <h1>{prop}1</h1> |
| 2252 | }; |
| 2253 | } |
| 2254 | } |
| 2255 | |
| 2256 | export default function Parent() { |
| 2257 | return <Foo.Bar.Child prop={'A'} />; |
| 2258 | } |
| 2259 | `); |
| 2260 | const el = container.firstChild; |
| 2261 | expect(el.textContent).toBe('A1'); |
| 2262 | await patch(` |
| 2263 | namespace Foo { |
| 2264 | export namespace Bar { |
| 2265 | export const Child = ({prop}) => { |
| 2266 | return <h1>{prop}2</h1> |
| 2267 | }; |
| 2268 | } |
| 2269 | } |
| 2270 | |
| 2271 | export default function Parent() { |
| 2272 | return <Foo.Bar.Child prop={'B'} />; |
| 2273 | } |
| 2274 | `); |
| 2275 | expect(container.firstChild).toBe(el); |
| 2276 | expect(el.textContent).toBe('B2'); |
| 2277 | } |
| 2278 | }); |
| 2279 | } |
| 2280 | }); |