| 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 | * @flow |
| 8 | */ |
| 9 | |
| 10 | import type {Fiber} from './ReactInternalTypes'; |
| 11 | |
| 12 | import { |
| 13 | HostComponent, |
| 14 | HostHoistable, |
| 15 | HostSingleton, |
| 16 | LazyComponent, |
| 17 | ActivityComponent, |
| 18 | SuspenseComponent, |
| 19 | SuspenseListComponent, |
| 20 | FunctionComponent, |
| 21 | ForwardRef, |
| 22 | SimpleMemoComponent, |
| 23 | ClassComponent, |
| 24 | HostText, |
| 25 | } from './ReactWorkTags'; |
| 26 | |
| 27 | import {enableSrcObject} from 'shared/ReactFeatureFlags'; |
| 28 | |
| 29 | import {REACT_ELEMENT_TYPE} from 'shared/ReactSymbols'; |
| 30 | import assign from 'shared/assign'; |
| 31 | import getComponentNameFromType from 'shared/getComponentNameFromType'; |
| 32 | |
| 33 | import isArray from 'shared/isArray'; |
| 34 | |
| 35 | export type HydrationDiffNode = { |
| 36 | fiber: Fiber, |
| 37 | children: Array<HydrationDiffNode>, |
| 38 | serverProps: void | null | $ReadOnly<{[propName: string]: mixed}> | string, // null means no matching server node |
| 39 | serverTail: Array< |
| 40 | | $ReadOnly<{type: string, props: $ReadOnly<{[propName: string]: mixed}>}> |
| 41 | | string, |
| 42 | >, |
| 43 | distanceFromLeaf: number, |
| 44 | }; |
| 45 | |
| 46 | const maxRowLength = 120; |
| 47 | const idealDepth = 15; |
| 48 | |
| 49 | function findNotableNode( |
| 50 | node: HydrationDiffNode, |
| 51 | indent: number, |
| 52 | ): HydrationDiffNode { |
| 53 | if ( |
| 54 | node.serverProps === undefined && |
| 55 | node.serverTail.length === 0 && |
| 56 | node.children.length === 1 && |
| 57 | node.distanceFromLeaf > 3 && |
| 58 | node.distanceFromLeaf > idealDepth - indent |
| 59 | ) { |
| 60 | // This is not an interesting node for contextual purposes so we can skip it. |
| 61 | const child = node.children[0]; |
| 62 | return findNotableNode(child, indent); |
| 63 | } |
| 64 | return node; |
| 65 | } |
| 66 | |
| 67 | function indentation(indent: number): string { |
| 68 | return ' ' + ' '.repeat(indent); |
| 69 | } |
| 70 | |
| 71 | function added(indent: number): string { |
| 72 | return '+ ' + ' '.repeat(indent); |
| 73 | } |
| 74 | |
| 75 | function removed(indent: number): string { |
| 76 | return '- ' + ' '.repeat(indent); |
| 77 | } |
| 78 | |
| 79 | function describeFiberType(fiber: Fiber): null | string { |
| 80 | switch (fiber.tag) { |
| 81 | case HostHoistable: |
| 82 | case HostSingleton: |
| 83 | case HostComponent: |
| 84 | return fiber.type; |
| 85 | case LazyComponent: |
| 86 | return 'Lazy'; |
| 87 | case ActivityComponent: |
| 88 | return 'Activity'; |
| 89 | case SuspenseComponent: |
| 90 | return 'Suspense'; |
| 91 | case SuspenseListComponent: |
| 92 | return 'SuspenseList'; |
| 93 | case FunctionComponent: |
| 94 | case SimpleMemoComponent: |
| 95 | const fn = fiber.type; |
| 96 | return fn.displayName || fn.name || null; |
| 97 | case ForwardRef: |
| 98 | const render = fiber.type.render; |
| 99 | return render.displayName || render.name || null; |
| 100 | case ClassComponent: |
| 101 | const ctr = fiber.type; |
| 102 | return ctr.displayName || ctr.name || null; |
| 103 | default: |
| 104 | // Skip |
| 105 | return null; |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | const needsEscaping = /["'&<>\n\t]|^\s|\s$/; |
| 110 | |
| 111 | function describeTextNode(content: string, maxLength: number): string { |
| 112 | if (needsEscaping.test(content)) { |
| 113 | const encoded = JSON.stringify(content); |
| 114 | if (encoded.length > maxLength - 2) { |
| 115 | if (maxLength < 8) { |
| 116 | return '{"..."}'; |
| 117 | } |
| 118 | return '{' + encoded.slice(0, maxLength - 7) + '..."}'; |
| 119 | } |
| 120 | return '{' + encoded + '}'; |
| 121 | } else { |
| 122 | if (content.length > maxLength) { |
| 123 | if (maxLength < 5) { |
| 124 | return '{"..."}'; |
| 125 | } |
| 126 | return content.slice(0, maxLength - 3) + '...'; |
| 127 | } |
| 128 | return content; |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | function describeTextDiff( |
| 133 | clientText: string, |
| 134 | serverProps: mixed, |
| 135 | indent: number, |
| 136 | ): string { |
| 137 | const maxLength = maxRowLength - indent * 2; |
| 138 | if (serverProps === null) { |
| 139 | return added(indent) + describeTextNode(clientText, maxLength) + '\n'; |
| 140 | } else if (typeof serverProps === 'string') { |
| 141 | let serverText: string = serverProps; |
| 142 | let firstDiff = 0; |
| 143 | for ( |
| 144 | ; |
| 145 | firstDiff < serverText.length && firstDiff < clientText.length; |
| 146 | firstDiff++ |
| 147 | ) { |
| 148 | if ( |
| 149 | serverText.charCodeAt(firstDiff) !== clientText.charCodeAt(firstDiff) |
| 150 | ) { |
| 151 | break; |
| 152 | } |
| 153 | } |
| 154 | if (firstDiff > maxLength - 8 && firstDiff > 10) { |
| 155 | // The first difference between the two strings would be cut off, so cut off in |
| 156 | // the beginning instead. |
| 157 | clientText = '...' + clientText.slice(firstDiff - 8); |
| 158 | serverText = '...' + serverText.slice(firstDiff - 8); |
| 159 | } |
| 160 | return ( |
| 161 | added(indent) + |
| 162 | describeTextNode(clientText, maxLength) + |
| 163 | '\n' + |
| 164 | removed(indent) + |
| 165 | describeTextNode(serverText, maxLength) + |
| 166 | '\n' |
| 167 | ); |
| 168 | } else { |
| 169 | return indentation(indent) + describeTextNode(clientText, maxLength) + '\n'; |
| 170 | } |
| 171 | } |
| 172 | |
| 173 | function objectName(object: mixed): string { |
| 174 | // $FlowFixMe[method-unbinding] |
| 175 | const name = Object.prototype.toString.call(object); |
| 176 | return name.replace(/^\[object (.*)\]$/, function (m, p0) { |
| 177 | return p0; |
| 178 | }); |
| 179 | } |
| 180 | |
| 181 | function describeValue(value: mixed, maxLength: number): string { |
| 182 | switch (typeof value) { |
| 183 | case 'string': { |
| 184 | const encoded = JSON.stringify(value); |
| 185 | if (encoded.length > maxLength) { |
| 186 | if (maxLength < 5) { |
| 187 | return '"..."'; |
| 188 | } |
| 189 | return encoded.slice(0, maxLength - 4) + '..."'; |
| 190 | } |
| 191 | return encoded; |
| 192 | } |
| 193 | case 'object': { |
| 194 | if (value === null) { |
| 195 | return 'null'; |
| 196 | } |
| 197 | if (isArray(value)) { |
| 198 | return '[...]'; |
| 199 | } |
| 200 | if ((value as any).$$typeof === REACT_ELEMENT_TYPE) { |
| 201 | const type = getComponentNameFromType((value as any).type); |
| 202 | return type ? '<' + type + '>' : '<...>'; |
| 203 | } |
| 204 | const name = objectName(value); |
| 205 | if (name === 'Object') { |
| 206 | let properties = ''; |
| 207 | maxLength -= 2; |
| 208 | for (let propName in value) { |
| 209 | if (!value.hasOwnProperty(propName)) { |
| 210 | continue; |
| 211 | } |
| 212 | const jsonPropName = JSON.stringify(propName); |
| 213 | if (jsonPropName !== '"' + propName + '"') { |
| 214 | propName = jsonPropName; |
| 215 | } |
| 216 | maxLength -= propName.length - 2; |
| 217 | const propValue = describeValue( |
| 218 | value[propName], |
| 219 | maxLength < 15 ? maxLength : 15, |
| 220 | ); |
| 221 | maxLength -= propValue.length; |
| 222 | if (maxLength < 0) { |
| 223 | properties += properties === '' ? '...' : ', ...'; |
| 224 | break; |
| 225 | } |
| 226 | properties += |
| 227 | (properties === '' ? '' : ',') + propName + ':' + propValue; |
| 228 | } |
| 229 | return '{' + properties + '}'; |
| 230 | } else if (enableSrcObject && (name === 'Blob' || name === 'File')) { |
| 231 | return name + ':' + (value as any).type; |
| 232 | } |
| 233 | return name; |
| 234 | } |
| 235 | case 'function': { |
| 236 | const name = (value as any).displayName || value.name; |
| 237 | return name ? 'function ' + name : 'function'; |
| 238 | } |
| 239 | default: |
| 240 | // eslint-disable-next-line react-internal/safe-string-coercion |
| 241 | return String(value); |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | function describePropValue(value: mixed, maxLength: number): string { |
| 246 | if (typeof value === 'string' && !needsEscaping.test(value)) { |
| 247 | if (value.length > maxLength - 2) { |
| 248 | if (maxLength < 5) { |
| 249 | return '"..."'; |
| 250 | } |
| 251 | return '"' + value.slice(0, maxLength - 5) + '..."'; |
| 252 | } |
| 253 | return '"' + value + '"'; |
| 254 | } |
| 255 | return '{' + describeValue(value, maxLength - 2) + '}'; |
| 256 | } |
| 257 | |
| 258 | function describeCollapsedElement( |
| 259 | type: string, |
| 260 | props: {[propName: string]: mixed}, |
| 261 | indent: number, |
| 262 | ): string { |
| 263 | // This function tries to fit the props into a single line for non-essential elements. |
| 264 | // We also ignore children because we're not going deeper. |
| 265 | |
| 266 | let maxLength = maxRowLength - indent * 2 - type.length - 2; |
| 267 | |
| 268 | let content = ''; |
| 269 | |
| 270 | for (const propName in props) { |
| 271 | if (!props.hasOwnProperty(propName)) { |
| 272 | continue; |
| 273 | } |
| 274 | if (propName === 'children') { |
| 275 | // Ignored. |
| 276 | continue; |
| 277 | } |
| 278 | const propValue = describePropValue(props[propName], 15); |
| 279 | maxLength -= propName.length + propValue.length + 2; |
| 280 | if (maxLength < 0) { |
| 281 | content += ' ...'; |
| 282 | break; |
| 283 | } |
| 284 | content += ' ' + propName + '=' + propValue; |
| 285 | } |
| 286 | |
| 287 | return indentation(indent) + '<' + type + content + '>\n'; |
| 288 | } |
| 289 | |
| 290 | function describeExpandedElement( |
| 291 | type: string, |
| 292 | props: {+[propName: string]: mixed}, |
| 293 | rowPrefix: string, |
| 294 | ): string { |
| 295 | // This function tries to fit the props into a single line for non-essential elements. |
| 296 | // We also ignore children because we're not going deeper. |
| 297 | |
| 298 | let remainingRowLength = maxRowLength - rowPrefix.length - type.length; |
| 299 | |
| 300 | // We add the properties to a set so we can choose later whether we'll put it on one |
| 301 | // line or multiple lines. |
| 302 | |
| 303 | const properties = []; |
| 304 | |
| 305 | for (const propName in props) { |
| 306 | if (!props.hasOwnProperty(propName)) { |
| 307 | continue; |
| 308 | } |
| 309 | if (propName === 'children') { |
| 310 | // Ignored. |
| 311 | continue; |
| 312 | } |
| 313 | const maxLength = maxRowLength - rowPrefix.length - propName.length - 1; |
| 314 | const propValue = describePropValue(props[propName], maxLength); |
| 315 | remainingRowLength -= propName.length + propValue.length + 2; |
| 316 | properties.push(propName + '=' + propValue); |
| 317 | } |
| 318 | |
| 319 | if (properties.length === 0) { |
| 320 | return rowPrefix + '<' + type + '>\n'; |
| 321 | } else if (remainingRowLength > 0) { |
| 322 | // We can fit all on one row. |
| 323 | return rowPrefix + '<' + type + ' ' + properties.join(' ') + '>\n'; |
| 324 | } else { |
| 325 | // Split into one row per property: |
| 326 | return ( |
| 327 | rowPrefix + |
| 328 | '<' + |
| 329 | type + |
| 330 | '\n' + |
| 331 | rowPrefix + |
| 332 | ' ' + |
| 333 | properties.join('\n' + rowPrefix + ' ') + |
| 334 | '\n' + |
| 335 | rowPrefix + |
| 336 | '>\n' |
| 337 | ); |
| 338 | } |
| 339 | } |
| 340 | |
| 341 | function describePropertiesDiff( |
| 342 | clientObject: {+[propName: string]: mixed}, |
| 343 | serverObject: {+[propName: string]: mixed}, |
| 344 | indent: number, |
| 345 | ): string { |
| 346 | let properties = ''; |
| 347 | const remainingServerProperties = assign({}, serverObject); |
| 348 | for (const propName in clientObject) { |
| 349 | if (!clientObject.hasOwnProperty(propName)) { |
| 350 | continue; |
| 351 | } |
| 352 | delete remainingServerProperties[propName]; |
| 353 | const maxLength = maxRowLength - indent * 2 - propName.length - 2; |
| 354 | const clientValue = clientObject[propName]; |
| 355 | const clientPropValue = describeValue(clientValue, maxLength); |
| 356 | if (serverObject.hasOwnProperty(propName)) { |
| 357 | const serverValue = serverObject[propName]; |
| 358 | const serverPropValue = describeValue(serverValue, maxLength); |
| 359 | properties += added(indent) + propName + ': ' + clientPropValue + '\n'; |
| 360 | properties += removed(indent) + propName + ': ' + serverPropValue + '\n'; |
| 361 | } else { |
| 362 | properties += added(indent) + propName + ': ' + clientPropValue + '\n'; |
| 363 | } |
| 364 | } |
| 365 | for (const propName in remainingServerProperties) { |
| 366 | if (!remainingServerProperties.hasOwnProperty(propName)) { |
| 367 | continue; |
| 368 | } |
| 369 | const maxLength = maxRowLength - indent * 2 - propName.length - 2; |
| 370 | const serverValue = remainingServerProperties[propName]; |
| 371 | const serverPropValue = describeValue(serverValue, maxLength); |
| 372 | properties += removed(indent) + propName + ': ' + serverPropValue + '\n'; |
| 373 | } |
| 374 | return properties; |
| 375 | } |
| 376 | |
| 377 | function describeElementDiff( |
| 378 | type: string, |
| 379 | clientProps: {+[propName: string]: mixed}, |
| 380 | serverProps: {+[propName: string]: mixed}, |
| 381 | indent: number, |
| 382 | ): string { |
| 383 | let content = ''; |
| 384 | |
| 385 | // Maps any previously unmatched lower case server prop name to its full prop name |
| 386 | const serverPropNames: Map<string, string> = new Map(); |
| 387 | |
| 388 | for (const propName in serverProps) { |
| 389 | if (!serverProps.hasOwnProperty(propName)) { |
| 390 | continue; |
| 391 | } |
| 392 | serverPropNames.set(propName.toLowerCase(), propName); |
| 393 | } |
| 394 | |
| 395 | if (serverPropNames.size === 1 && serverPropNames.has('children')) { |
| 396 | content += describeExpandedElement(type, clientProps, indentation(indent)); |
| 397 | } else { |
| 398 | for (const propName in clientProps) { |
| 399 | if (!clientProps.hasOwnProperty(propName)) { |
| 400 | continue; |
| 401 | } |
| 402 | if (propName === 'children') { |
| 403 | // Handled below. |
| 404 | continue; |
| 405 | } |
| 406 | const maxLength = maxRowLength - (indent + 1) * 2 - propName.length - 1; |
| 407 | const serverPropName = serverPropNames.get(propName.toLowerCase()); |
| 408 | if (serverPropName !== undefined) { |
| 409 | serverPropNames.delete(propName.toLowerCase()); |
| 410 | // There's a diff here. |
| 411 | const clientValue = clientProps[propName]; |
| 412 | const serverValue = serverProps[serverPropName]; |
| 413 | const clientPropValue = describePropValue(clientValue, maxLength); |
| 414 | const serverPropValue = describePropValue(serverValue, maxLength); |
| 415 | if ( |
| 416 | typeof clientValue === 'object' && |
| 417 | clientValue !== null && |
| 418 | typeof serverValue === 'object' && |
| 419 | serverValue !== null && |
| 420 | objectName(clientValue) === 'Object' && |
| 421 | objectName(serverValue) === 'Object' && |
| 422 | // Only do the diff if the object has a lot of keys or was shortened. |
| 423 | (Object.keys(clientValue).length > 2 || |
| 424 | Object.keys(serverValue).length > 2 || |
| 425 | clientPropValue.indexOf('...') > -1 || |
| 426 | serverPropValue.indexOf('...') > -1) |
| 427 | ) { |
| 428 | // We're comparing two plain objects. We can diff the nested objects instead. |
| 429 | content += |
| 430 | indentation(indent + 1) + |
| 431 | propName + |
| 432 | '={{\n' + |
| 433 | describePropertiesDiff(clientValue, serverValue, indent + 2) + |
| 434 | indentation(indent + 1) + |
| 435 | '}}\n'; |
| 436 | } else { |
| 437 | content += |
| 438 | added(indent + 1) + propName + '=' + clientPropValue + '\n'; |
| 439 | content += |
| 440 | removed(indent + 1) + propName + '=' + serverPropValue + '\n'; |
| 441 | } |
| 442 | } else { |
| 443 | // Considered equal. |
| 444 | content += |
| 445 | indentation(indent + 1) + |
| 446 | propName + |
| 447 | '=' + |
| 448 | describePropValue(clientProps[propName], maxLength) + |
| 449 | '\n'; |
| 450 | } |
| 451 | } |
| 452 | |
| 453 | serverPropNames.forEach(propName => { |
| 454 | if (propName === 'children') { |
| 455 | // Handled below. |
| 456 | return; |
| 457 | } |
| 458 | const maxLength = maxRowLength - (indent + 1) * 2 - propName.length - 1; |
| 459 | content += |
| 460 | removed(indent + 1) + |
| 461 | propName + |
| 462 | '=' + |
| 463 | describePropValue(serverProps[propName], maxLength) + |
| 464 | '\n'; |
| 465 | }); |
| 466 | |
| 467 | if (content === '') { |
| 468 | // No properties |
| 469 | content = indentation(indent) + '<' + type + '>\n'; |
| 470 | } else { |
| 471 | // Had properties |
| 472 | content = |
| 473 | indentation(indent) + |
| 474 | '<' + |
| 475 | type + |
| 476 | '\n' + |
| 477 | content + |
| 478 | indentation(indent) + |
| 479 | '>\n'; |
| 480 | } |
| 481 | } |
| 482 | |
| 483 | const serverChildren = serverProps.children; |
| 484 | const clientChildren = clientProps.children; |
| 485 | if ( |
| 486 | typeof serverChildren === 'string' || |
| 487 | typeof serverChildren === 'number' || |
| 488 | typeof serverChildren === 'bigint' |
| 489 | ) { |
| 490 | // There's a diff of the children. |
| 491 | // $FlowFixMe[unsafe-addition] |
| 492 | const serverText = '' + serverChildren; |
| 493 | let clientText = ''; |
| 494 | if ( |
| 495 | typeof clientChildren === 'string' || |
| 496 | typeof clientChildren === 'number' || |
| 497 | typeof clientChildren === 'bigint' |
| 498 | ) { |
| 499 | // $FlowFixMe[unsafe-addition] |
| 500 | clientText = '' + clientChildren; |
| 501 | } |
| 502 | content += describeTextDiff(clientText, serverText, indent + 1); |
| 503 | } else if ( |
| 504 | typeof clientChildren === 'string' || |
| 505 | typeof clientChildren === 'number' || |
| 506 | typeof clientChildren === 'bigint' |
| 507 | ) { |
| 508 | if (serverChildren == null) { |
| 509 | // This is a new string child. |
| 510 | // $FlowFixMe[unsafe-addition] |
| 511 | content += describeTextDiff('' + clientChildren, null, indent + 1); |
| 512 | } else { |
| 513 | // The client has children but it's not considered a difference from the server. |
| 514 | // $FlowFixMe[unsafe-addition] |
| 515 | content += describeTextDiff('' + clientChildren, undefined, indent + 1); |
| 516 | } |
| 517 | } |
| 518 | return content; |
| 519 | } |
| 520 | |
| 521 | function describeSiblingFiber(fiber: Fiber, indent: number): string { |
| 522 | const type = describeFiberType(fiber); |
| 523 | if (type === null) { |
| 524 | // Skip this type of fiber. We currently treat this as a fragment |
| 525 | // so it's just part of the parent's children. |
| 526 | let flatContent = ''; |
| 527 | let childFiber = fiber.child; |
| 528 | while (childFiber) { |
| 529 | flatContent += describeSiblingFiber(childFiber, indent); |
| 530 | childFiber = childFiber.sibling; |
| 531 | } |
| 532 | return flatContent; |
| 533 | } |
| 534 | return indentation(indent) + '<' + type + '>' + '\n'; |
| 535 | } |
| 536 | |
| 537 | function describeNode(node: HydrationDiffNode, indent: number): string { |
| 538 | const skipToNode = findNotableNode(node, indent); |
| 539 | if ( |
| 540 | skipToNode !== node && |
| 541 | (node.children.length !== 1 || node.children[0] !== skipToNode) |
| 542 | ) { |
| 543 | return indentation(indent) + '...\n' + describeNode(skipToNode, indent + 1); |
| 544 | } |
| 545 | |
| 546 | // Prefix with any server components for context |
| 547 | let parentContent = ''; |
| 548 | const debugInfo = node.fiber._debugInfo; |
| 549 | if (debugInfo) { |
| 550 | for (let i = 0; i < debugInfo.length; i++) { |
| 551 | const serverComponentName = debugInfo[i].name; |
| 552 | if (typeof serverComponentName === 'string') { |
| 553 | parentContent += |
| 554 | indentation(indent) + '<' + serverComponentName + '>' + '\n'; |
| 555 | indent++; |
| 556 | } |
| 557 | } |
| 558 | } |
| 559 | |
| 560 | // Self |
| 561 | let selfContent = ''; |
| 562 | |
| 563 | // We use the pending props since we might be generating a diff before the complete phase |
| 564 | // when something throws. |
| 565 | const clientProps = node.fiber.pendingProps; |
| 566 | |
| 567 | if (node.fiber.tag === HostText) { |
| 568 | // Text Node |
| 569 | selfContent = describeTextDiff(clientProps, node.serverProps, indent); |
| 570 | indent++; |
| 571 | } else { |
| 572 | const type = describeFiberType(node.fiber); |
| 573 | if (type !== null) { |
| 574 | // Element Node |
| 575 | if (node.serverProps === undefined) { |
| 576 | // Just a reference node for context. |
| 577 | selfContent = describeCollapsedElement(type, clientProps, indent); |
| 578 | indent++; |
| 579 | } else if (node.serverProps === null) { |
| 580 | selfContent = describeExpandedElement(type, clientProps, added(indent)); |
| 581 | indent++; |
| 582 | } else if (typeof node.serverProps === 'string') { |
| 583 | if (__DEV__) { |
| 584 | console.error( |
| 585 | 'Should not have matched a non HostText fiber to a Text node. This is a bug in React.', |
| 586 | ); |
| 587 | } |
| 588 | } else { |
| 589 | selfContent = describeElementDiff( |
| 590 | type, |
| 591 | clientProps, |
| 592 | node.serverProps, |
| 593 | indent, |
| 594 | ); |
| 595 | indent++; |
| 596 | } |
| 597 | } |
| 598 | } |
| 599 | |
| 600 | // Compute children |
| 601 | let childContent = ''; |
| 602 | let childFiber = node.fiber.child; |
| 603 | let diffIdx = 0; |
| 604 | while (childFiber && diffIdx < node.children.length) { |
| 605 | const childNode = node.children[diffIdx]; |
| 606 | if (childNode.fiber === childFiber) { |
| 607 | // This was a match in the diff. |
| 608 | childContent += describeNode(childNode, indent); |
| 609 | diffIdx++; |
| 610 | } else { |
| 611 | // This is an unrelated previous sibling. |
| 612 | childContent += describeSiblingFiber(childFiber, indent); |
| 613 | } |
| 614 | childFiber = childFiber.sibling; |
| 615 | } |
| 616 | |
| 617 | if (childFiber && node.children.length > 0) { |
| 618 | // If we had any further siblings after the last mismatch, we can't be sure if it's |
| 619 | // actually a valid match since it might not have found a match. So we exclude next |
| 620 | // siblings to avoid confusion. |
| 621 | childContent += indentation(indent) + '...' + '\n'; |
| 622 | } |
| 623 | |
| 624 | // Deleted tail nodes |
| 625 | const serverTail = node.serverTail; |
| 626 | if (node.serverProps === null) { |
| 627 | indent--; |
| 628 | } |
| 629 | for (let i = 0; i < serverTail.length; i++) { |
| 630 | const tailNode = serverTail[i]; |
| 631 | if (typeof tailNode === 'string') { |
| 632 | // Removed text node |
| 633 | childContent += |
| 634 | removed(indent) + |
| 635 | describeTextNode(tailNode, maxRowLength - indent * 2) + |
| 636 | '\n'; |
| 637 | } else { |
| 638 | // Removed element |
| 639 | childContent += describeExpandedElement( |
| 640 | tailNode.type, |
| 641 | tailNode.props, |
| 642 | removed(indent), |
| 643 | ); |
| 644 | } |
| 645 | } |
| 646 | |
| 647 | return parentContent + selfContent + childContent; |
| 648 | } |
| 649 | |
| 650 | export function describeDiff(rootNode: HydrationDiffNode): string { |
| 651 | try { |
| 652 | return '\n\n' + describeNode(rootNode, 0); |
| 653 | } catch (x) { |
| 654 | return ''; |
| 655 | } |
| 656 | } |