| 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 * as acorn from 'acorn-loose'; |
| 11 | |
| 12 | import readMappings from 'webpack-sources/lib/helpers/readMappings.js'; |
| 13 | import createMappingsSerializer from 'webpack-sources/lib/helpers/createMappingsSerializer.js'; |
| 14 | |
| 15 | type ResolveContext = { |
| 16 | conditions: Array<string>, |
| 17 | parentURL: string | void, |
| 18 | }; |
| 19 | |
| 20 | type ResolveFunction = ( |
| 21 | string, |
| 22 | ResolveContext, |
| 23 | ResolveFunction, |
| 24 | ) => {url: string} | Promise<{url: string}>; |
| 25 | |
| 26 | type GetSourceContext = { |
| 27 | format: string, |
| 28 | }; |
| 29 | |
| 30 | type GetSourceFunction = ( |
| 31 | string, |
| 32 | GetSourceContext, |
| 33 | GetSourceFunction, |
| 34 | ) => Promise<{source: Source}>; |
| 35 | |
| 36 | type TransformSourceContext = { |
| 37 | format: string, |
| 38 | url: string, |
| 39 | }; |
| 40 | |
| 41 | type TransformSourceFunction = ( |
| 42 | Source, |
| 43 | TransformSourceContext, |
| 44 | TransformSourceFunction, |
| 45 | ) => Promise<{source: Source}>; |
| 46 | |
| 47 | type LoadContext = { |
| 48 | conditions: Array<string>, |
| 49 | format: string | null | void, |
| 50 | importAssertions: Object, |
| 51 | }; |
| 52 | |
| 53 | type LoadFunction = ( |
| 54 | string, |
| 55 | LoadContext, |
| 56 | LoadFunction, |
| 57 | ) => Promise<{format: string, shortCircuit?: boolean, source: Source}>; |
| 58 | |
| 59 | type Source = string | ArrayBuffer | Uint8Array; |
| 60 | |
| 61 | let warnedAboutConditionsFlag = false; |
| 62 | |
| 63 | let stashedGetSource: null | GetSourceFunction = null; |
| 64 | let stashedResolve: null | ResolveFunction = null; |
| 65 | |
| 66 | export async function resolve( |
| 67 | specifier: string, |
| 68 | context: ResolveContext, |
| 69 | defaultResolve: ResolveFunction, |
| 70 | ): Promise<{url: string}> { |
| 71 | // We stash this in case we end up needing to resolve export * statements later. |
| 72 | stashedResolve = defaultResolve; |
| 73 | |
| 74 | if (!context.conditions.includes('react-server')) { |
| 75 | context = { |
| 76 | ...context, |
| 77 | conditions: [...context.conditions, 'react-server'], |
| 78 | }; |
| 79 | if (!warnedAboutConditionsFlag) { |
| 80 | warnedAboutConditionsFlag = true; |
| 81 | // eslint-disable-next-line react-internal/no-production-logging |
| 82 | console.warn( |
| 83 | 'You did not run Node.js with the `--conditions react-server` flag. ' + |
| 84 | 'Any "react-server" override will only work with ESM imports.', |
| 85 | ); |
| 86 | } |
| 87 | } |
| 88 | return await defaultResolve(specifier, context, defaultResolve); |
| 89 | } |
| 90 | |
| 91 | export async function getSource( |
| 92 | url: string, |
| 93 | context: GetSourceContext, |
| 94 | defaultGetSource: GetSourceFunction, |
| 95 | ): Promise<{source: Source}> { |
| 96 | // We stash this in case we end up needing to resolve export * statements later. |
| 97 | stashedGetSource = defaultGetSource; |
| 98 | return defaultGetSource(url, context, defaultGetSource); |
| 99 | } |
| 100 | |
| 101 | type ExportedEntry = { |
| 102 | localName: string, |
| 103 | exportedName: string, |
| 104 | type: null | string, |
| 105 | loc: { |
| 106 | start: {line: number, column: number}, |
| 107 | end: {line: number, column: number}, |
| 108 | }, |
| 109 | originalLine: number, |
| 110 | originalColumn: number, |
| 111 | originalSource: number, |
| 112 | nameIndex: number, |
| 113 | }; |
| 114 | |
| 115 | function addExportedEntry( |
| 116 | exportedEntries: Array<ExportedEntry>, |
| 117 | localNames: Set<string>, |
| 118 | localName: string, |
| 119 | exportedName: string, |
| 120 | type: null | 'function', |
| 121 | loc: { |
| 122 | start: {line: number, column: number}, |
| 123 | end: {line: number, column: number}, |
| 124 | }, |
| 125 | ) { |
| 126 | if (localNames.has(localName)) { |
| 127 | // If the same local name is exported more than once, we only need one of the names. |
| 128 | return; |
| 129 | } |
| 130 | exportedEntries.push({ |
| 131 | localName, |
| 132 | exportedName, |
| 133 | type, |
| 134 | loc, |
| 135 | originalLine: -1, |
| 136 | originalColumn: -1, |
| 137 | originalSource: -1, |
| 138 | nameIndex: -1, |
| 139 | }); |
| 140 | } |
| 141 | |
| 142 | function addLocalExportedNames( |
| 143 | exportedEntries: Array<ExportedEntry>, |
| 144 | localNames: Set<string>, |
| 145 | node: any, |
| 146 | ) { |
| 147 | switch (node.type) { |
| 148 | case 'Identifier': |
| 149 | addExportedEntry( |
| 150 | exportedEntries, |
| 151 | localNames, |
| 152 | node.name, |
| 153 | node.name, |
| 154 | null, |
| 155 | node.loc, |
| 156 | ); |
| 157 | return; |
| 158 | case 'ObjectPattern': |
| 159 | for (let i = 0; i < node.properties.length; i++) |
| 160 | addLocalExportedNames(exportedEntries, localNames, node.properties[i]); |
| 161 | return; |
| 162 | case 'ArrayPattern': |
| 163 | for (let i = 0; i < node.elements.length; i++) { |
| 164 | const element = node.elements[i]; |
| 165 | if (element) |
| 166 | addLocalExportedNames(exportedEntries, localNames, element); |
| 167 | } |
| 168 | return; |
| 169 | case 'Property': |
| 170 | addLocalExportedNames(exportedEntries, localNames, node.value); |
| 171 | return; |
| 172 | case 'AssignmentPattern': |
| 173 | addLocalExportedNames(exportedEntries, localNames, node.left); |
| 174 | return; |
| 175 | case 'RestElement': |
| 176 | addLocalExportedNames(exportedEntries, localNames, node.argument); |
| 177 | return; |
| 178 | case 'ParenthesizedExpression': |
| 179 | addLocalExportedNames(exportedEntries, localNames, node.expression); |
| 180 | return; |
| 181 | } |
| 182 | } |
| 183 | |
| 184 | function transformServerModule( |
| 185 | source: string, |
| 186 | program: any, |
| 187 | url: string, |
| 188 | sourceMap: any, |
| 189 | loader: LoadFunction, |
| 190 | ): string { |
| 191 | const body = program.body; |
| 192 | |
| 193 | // This entry list needs to be in source location order. |
| 194 | const exportedEntries: Array<ExportedEntry> = []; |
| 195 | // Dedupe set. |
| 196 | const localNames: Set<string> = new Set(); |
| 197 | |
| 198 | for (let i = 0; i < body.length; i++) { |
| 199 | const node = body[i]; |
| 200 | switch (node.type) { |
| 201 | case 'ExportAllDeclaration': |
| 202 | // If export * is used, the other file needs to explicitly opt into "use server" too. |
| 203 | break; |
| 204 | case 'ExportDefaultDeclaration': |
| 205 | if (node.declaration.type === 'Identifier') { |
| 206 | addExportedEntry( |
| 207 | exportedEntries, |
| 208 | localNames, |
| 209 | node.declaration.name, |
| 210 | 'default', |
| 211 | null, |
| 212 | node.declaration.loc, |
| 213 | ); |
| 214 | } else if (node.declaration.type === 'FunctionDeclaration') { |
| 215 | if (node.declaration.id) { |
| 216 | addExportedEntry( |
| 217 | exportedEntries, |
| 218 | localNames, |
| 219 | node.declaration.id.name, |
| 220 | 'default', |
| 221 | 'function', |
| 222 | node.declaration.id.loc, |
| 223 | ); |
| 224 | } else { |
| 225 | // TODO: This needs to be rewritten inline because it doesn't have a local name. |
| 226 | } |
| 227 | } |
| 228 | continue; |
| 229 | case 'ExportNamedDeclaration': |
| 230 | if (node.declaration) { |
| 231 | if (node.declaration.type === 'VariableDeclaration') { |
| 232 | const declarations = node.declaration.declarations; |
| 233 | for (let j = 0; j < declarations.length; j++) { |
| 234 | addLocalExportedNames( |
| 235 | exportedEntries, |
| 236 | localNames, |
| 237 | declarations[j].id, |
| 238 | ); |
| 239 | } |
| 240 | } else { |
| 241 | const name = node.declaration.id.name; |
| 242 | addExportedEntry( |
| 243 | exportedEntries, |
| 244 | localNames, |
| 245 | name, |
| 246 | name, |
| 247 | |
| 248 | node.declaration.type === 'FunctionDeclaration' |
| 249 | ? 'function' |
| 250 | : null, |
| 251 | node.declaration.id.loc, |
| 252 | ); |
| 253 | } |
| 254 | } |
| 255 | if (node.specifiers) { |
| 256 | const specifiers = node.specifiers; |
| 257 | for (let j = 0; j < specifiers.length; j++) { |
| 258 | const specifier = specifiers[j]; |
| 259 | addExportedEntry( |
| 260 | exportedEntries, |
| 261 | localNames, |
| 262 | specifier.local.name, |
| 263 | specifier.exported.name, |
| 264 | null, |
| 265 | specifier.local.loc, |
| 266 | ); |
| 267 | } |
| 268 | } |
| 269 | continue; |
| 270 | } |
| 271 | } |
| 272 | |
| 273 | let mappings = |
| 274 | sourceMap && typeof sourceMap.mappings === 'string' |
| 275 | ? sourceMap.mappings |
| 276 | : ''; |
| 277 | let newSrc = source; |
| 278 | |
| 279 | if (exportedEntries.length > 0) { |
| 280 | let lastSourceIndex = 0; |
| 281 | let lastOriginalLine = 0; |
| 282 | let lastOriginalColumn = 0; |
| 283 | let lastNameIndex = 0; |
| 284 | let sourceLineCount = 0; |
| 285 | let lastMappedLine = 0; |
| 286 | |
| 287 | if (sourceMap) { |
| 288 | // We iterate source mapping entries and our matched exports in parallel to source map |
| 289 | // them to their original location. |
| 290 | let nextEntryIdx = 0; |
| 291 | let nextEntryLine = exportedEntries[nextEntryIdx].loc.start.line; |
| 292 | let nextEntryColumn = exportedEntries[nextEntryIdx].loc.start.column; |
| 293 | readMappings( |
| 294 | mappings, |
| 295 | ( |
| 296 | generatedLine: number, |
| 297 | generatedColumn: number, |
| 298 | sourceIndex: number, |
| 299 | originalLine: number, |
| 300 | originalColumn: number, |
| 301 | nameIndex: number, |
| 302 | ) => { |
| 303 | if ( |
| 304 | generatedLine > nextEntryLine || |
| 305 | (generatedLine === nextEntryLine && |
| 306 | generatedColumn > nextEntryColumn) |
| 307 | ) { |
| 308 | // We're past the entry which means that the best match we have is the previous entry. |
| 309 | if (lastMappedLine === nextEntryLine) { |
| 310 | // Match |
| 311 | exportedEntries[nextEntryIdx].originalLine = lastOriginalLine; |
| 312 | exportedEntries[nextEntryIdx].originalColumn = lastOriginalColumn; |
| 313 | exportedEntries[nextEntryIdx].originalSource = lastSourceIndex; |
| 314 | exportedEntries[nextEntryIdx].nameIndex = lastNameIndex; |
| 315 | } else { |
| 316 | // Skip if we didn't have any mappings on the exported line. |
| 317 | } |
| 318 | nextEntryIdx++; |
| 319 | if (nextEntryIdx < exportedEntries.length) { |
| 320 | nextEntryLine = exportedEntries[nextEntryIdx].loc.start.line; |
| 321 | nextEntryColumn = exportedEntries[nextEntryIdx].loc.start.column; |
| 322 | } else { |
| 323 | nextEntryLine = -1; |
| 324 | nextEntryColumn = -1; |
| 325 | } |
| 326 | } |
| 327 | lastMappedLine = generatedLine; |
| 328 | if (sourceIndex > -1) { |
| 329 | lastSourceIndex = sourceIndex; |
| 330 | } |
| 331 | if (originalLine > -1) { |
| 332 | lastOriginalLine = originalLine; |
| 333 | } |
| 334 | if (originalColumn > -1) { |
| 335 | lastOriginalColumn = originalColumn; |
| 336 | } |
| 337 | if (nameIndex > -1) { |
| 338 | lastNameIndex = nameIndex; |
| 339 | } |
| 340 | }, |
| 341 | ); |
| 342 | if (nextEntryIdx < exportedEntries.length) { |
| 343 | if (lastMappedLine === nextEntryLine) { |
| 344 | // Match |
| 345 | exportedEntries[nextEntryIdx].originalLine = lastOriginalLine; |
| 346 | exportedEntries[nextEntryIdx].originalColumn = lastOriginalColumn; |
| 347 | exportedEntries[nextEntryIdx].originalSource = lastSourceIndex; |
| 348 | exportedEntries[nextEntryIdx].nameIndex = lastNameIndex; |
| 349 | } |
| 350 | } |
| 351 | |
| 352 | for ( |
| 353 | let lastIdx = mappings.length - 1; |
| 354 | lastIdx >= 0 && mappings[lastIdx] === ';'; |
| 355 | lastIdx-- |
| 356 | ) { |
| 357 | // If the last mapped lines don't contain any segments, we don't get a callback from readMappings |
| 358 | // so we need to pad the number of mapped lines, with one for each empty line. |
| 359 | lastMappedLine++; |
| 360 | } |
| 361 | |
| 362 | sourceLineCount = program.loc.end.line; |
| 363 | if (sourceLineCount < lastMappedLine) { |
| 364 | throw new Error( |
| 365 | 'The source map has more mappings than there are lines.', |
| 366 | ); |
| 367 | } |
| 368 | // If the original source string had more lines than there are mappings in the source map. |
| 369 | // Add some extra padding of unmapped lines so that any lines that we add line up. |
| 370 | for ( |
| 371 | let extraLines = sourceLineCount - lastMappedLine; |
| 372 | extraLines > 0; |
| 373 | extraLines-- |
| 374 | ) { |
| 375 | mappings += ';'; |
| 376 | } |
| 377 | } else { |
| 378 | // If a file doesn't have a source map then we generate a blank source map that just |
| 379 | // contains the original content and segments pointing to the original lines. |
| 380 | sourceLineCount = 1; |
| 381 | let idx = -1; |
| 382 | while ((idx = source.indexOf('\n', idx + 1)) !== -1) { |
| 383 | sourceLineCount++; |
| 384 | } |
| 385 | mappings = 'AAAA' + ';AACA'.repeat(sourceLineCount - 1); |
| 386 | sourceMap = { |
| 387 | version: 3, |
| 388 | sources: [url], |
| 389 | sourcesContent: [source], |
| 390 | mappings: mappings, |
| 391 | sourceRoot: '', |
| 392 | }; |
| 393 | lastSourceIndex = 0; |
| 394 | lastOriginalLine = sourceLineCount; |
| 395 | lastOriginalColumn = 0; |
| 396 | lastNameIndex = -1; |
| 397 | lastMappedLine = sourceLineCount; |
| 398 | |
| 399 | for (let i = 0; i < exportedEntries.length; i++) { |
| 400 | // Point each entry to original location. |
| 401 | const entry = exportedEntries[i]; |
| 402 | entry.originalSource = 0; |
| 403 | entry.originalLine = entry.loc.start.line; |
| 404 | // We use column zero since we do the short-hand line-only source maps above. |
| 405 | entry.originalColumn = 0; // entry.loc.start.column; |
| 406 | } |
| 407 | } |
| 408 | |
| 409 | newSrc += '\n\n;'; |
| 410 | newSrc += |
| 411 | 'import {registerServerReference} from "react-server-dom-esm/server";\n'; |
| 412 | if (mappings) { |
| 413 | mappings += ';;'; |
| 414 | } |
| 415 | |
| 416 | const createMapping = createMappingsSerializer(); |
| 417 | |
| 418 | // Create an empty mapping pointing to where we last left off to reset the counters. |
| 419 | let generatedLine = 1; |
| 420 | createMapping( |
| 421 | generatedLine, |
| 422 | 0, |
| 423 | lastSourceIndex, |
| 424 | lastOriginalLine, |
| 425 | lastOriginalColumn, |
| 426 | lastNameIndex, |
| 427 | ); |
| 428 | for (let i = 0; i < exportedEntries.length; i++) { |
| 429 | const entry = exportedEntries[i]; |
| 430 | generatedLine++; |
| 431 | if (entry.type !== 'function') { |
| 432 | // We first check if the export is a function and if so annotate it. |
| 433 | newSrc += 'if (typeof ' + entry.localName + ' === "function") '; |
| 434 | } |
| 435 | newSrc += 'registerServerReference(' + entry.localName + ','; |
| 436 | newSrc += JSON.stringify(url) + ','; |
| 437 | newSrc += JSON.stringify(entry.exportedName) + ');\n'; |
| 438 | |
| 439 | mappings += createMapping( |
| 440 | generatedLine, |
| 441 | 0, |
| 442 | entry.originalSource, |
| 443 | entry.originalLine, |
| 444 | entry.originalColumn, |
| 445 | entry.nameIndex, |
| 446 | ); |
| 447 | } |
| 448 | } |
| 449 | |
| 450 | if (sourceMap) { |
| 451 | // Override with an new mappings and serialize an inline source map. |
| 452 | sourceMap.mappings = mappings; |
| 453 | newSrc += |
| 454 | '//# sourceMappingURL=data:application/json;charset=utf-8;base64,' + |
| 455 | Buffer.from(JSON.stringify(sourceMap)).toString('base64'); |
| 456 | } |
| 457 | |
| 458 | return newSrc; |
| 459 | } |
| 460 | |
| 461 | function addExportNames(names: Array<string>, node: any) { |
| 462 | switch (node.type) { |
| 463 | case 'Identifier': |
| 464 | names.push(node.name); |
| 465 | return; |
| 466 | case 'ObjectPattern': |
| 467 | for (let i = 0; i < node.properties.length; i++) |
| 468 | addExportNames(names, node.properties[i]); |
| 469 | return; |
| 470 | case 'ArrayPattern': |
| 471 | for (let i = 0; i < node.elements.length; i++) { |
| 472 | const element = node.elements[i]; |
| 473 | if (element) addExportNames(names, element); |
| 474 | } |
| 475 | return; |
| 476 | case 'Property': |
| 477 | addExportNames(names, node.value); |
| 478 | return; |
| 479 | case 'AssignmentPattern': |
| 480 | addExportNames(names, node.left); |
| 481 | return; |
| 482 | case 'RestElement': |
| 483 | addExportNames(names, node.argument); |
| 484 | return; |
| 485 | case 'ParenthesizedExpression': |
| 486 | addExportNames(names, node.expression); |
| 487 | return; |
| 488 | } |
| 489 | } |
| 490 | |
| 491 | function resolveClientImport( |
| 492 | specifier: string, |
| 493 | parentURL: string, |
| 494 | ): {url: string} | Promise<{url: string}> { |
| 495 | // Resolve an import specifier as if it was loaded by the client. This doesn't use |
| 496 | // the overrides that this loader does but instead reverts to the default. |
| 497 | // This resolution algorithm will not necessarily have the same configuration |
| 498 | // as the actual client loader. It should mostly work and if it doesn't you can |
| 499 | // always convert to explicit exported names instead. |
| 500 | const conditions = ['node', 'import']; |
| 501 | if (stashedResolve === null) { |
| 502 | throw new Error( |
| 503 | 'Expected resolve to have been called before transformSource', |
| 504 | ); |
| 505 | } |
| 506 | return stashedResolve(specifier, {conditions, parentURL}, stashedResolve); |
| 507 | } |
| 508 | |
| 509 | async function parseExportNamesInto( |
| 510 | body: any, |
| 511 | names: Array<string>, |
| 512 | parentURL: string, |
| 513 | loader: LoadFunction, |
| 514 | ): Promise<void> { |
| 515 | for (let i = 0; i < body.length; i++) { |
| 516 | const node = body[i]; |
| 517 | switch (node.type) { |
| 518 | case 'ExportAllDeclaration': |
| 519 | if (node.exported) { |
| 520 | addExportNames(names, node.exported); |
| 521 | continue; |
| 522 | } else { |
| 523 | const {url} = await resolveClientImport(node.source.value, parentURL); |
| 524 | const {source} = await loader( |
| 525 | url, |
| 526 | {format: 'module', conditions: [], importAssertions: {}}, |
| 527 | loader, |
| 528 | ); |
| 529 | if (typeof source !== 'string') { |
| 530 | throw new Error('Expected the transformed source to be a string.'); |
| 531 | } |
| 532 | let childBody; |
| 533 | try { |
| 534 | childBody = acorn.parse(source, { |
| 535 | ecmaVersion: '2024', |
| 536 | sourceType: 'module', |
| 537 | }).body; |
| 538 | } catch (x) { |
| 539 | // eslint-disable-next-line react-internal/no-production-logging |
| 540 | console.error('Error parsing %s %s', url, x.message); |
| 541 | continue; |
| 542 | } |
| 543 | await parseExportNamesInto(childBody, names, url, loader); |
| 544 | continue; |
| 545 | } |
| 546 | case 'ExportDefaultDeclaration': |
| 547 | names.push('default'); |
| 548 | continue; |
| 549 | case 'ExportNamedDeclaration': |
| 550 | if (node.declaration) { |
| 551 | if (node.declaration.type === 'VariableDeclaration') { |
| 552 | const declarations = node.declaration.declarations; |
| 553 | for (let j = 0; j < declarations.length; j++) { |
| 554 | addExportNames(names, declarations[j].id); |
| 555 | } |
| 556 | } else { |
| 557 | addExportNames(names, node.declaration.id); |
| 558 | } |
| 559 | } |
| 560 | if (node.specifiers) { |
| 561 | const specifiers = node.specifiers; |
| 562 | for (let j = 0; j < specifiers.length; j++) { |
| 563 | addExportNames(names, specifiers[j].exported); |
| 564 | } |
| 565 | } |
| 566 | continue; |
| 567 | } |
| 568 | } |
| 569 | } |
| 570 | |
| 571 | async function transformClientModule( |
| 572 | program: any, |
| 573 | url: string, |
| 574 | sourceMap: any, |
| 575 | loader: LoadFunction, |
| 576 | ): Promise<string> { |
| 577 | const body = program.body; |
| 578 | |
| 579 | const names: Array<string> = []; |
| 580 | |
| 581 | await parseExportNamesInto(body, names, url, loader); |
| 582 | |
| 583 | if (names.length === 0) { |
| 584 | return ''; |
| 585 | } |
| 586 | |
| 587 | let newSrc = |
| 588 | 'import {registerClientReference} from "react-server-dom-esm/server";\n'; |
| 589 | for (let i = 0; i < names.length; i++) { |
| 590 | const name = names[i]; |
| 591 | if (name === 'default') { |
| 592 | newSrc += 'export default '; |
| 593 | newSrc += 'registerClientReference(function() {'; |
| 594 | newSrc += |
| 595 | 'throw new Error(' + |
| 596 | JSON.stringify( |
| 597 | `Attempted to call the default export of ${url} from the server ` + |
| 598 | `but it's on the client. It's not possible to invoke a client function from ` + |
| 599 | `the server, it can only be rendered as a Component or passed to props of a ` + |
| 600 | `Client Component.`, |
| 601 | ) + |
| 602 | ');'; |
| 603 | } else { |
| 604 | newSrc += 'export const ' + name + ' = '; |
| 605 | newSrc += 'registerClientReference(function() {'; |
| 606 | newSrc += |
| 607 | 'throw new Error(' + |
| 608 | JSON.stringify( |
| 609 | `Attempted to call ${name}() from the server but ${name} is on the client. ` + |
| 610 | `It's not possible to invoke a client function from the server, it can ` + |
| 611 | `only be rendered as a Component or passed to props of a Client Component.`, |
| 612 | ) + |
| 613 | ');'; |
| 614 | } |
| 615 | newSrc += '},'; |
| 616 | newSrc += JSON.stringify(url) + ','; |
| 617 | newSrc += JSON.stringify(name) + ');\n'; |
| 618 | } |
| 619 | |
| 620 | // TODO: Generate source maps for Client Reference functions so they can point to their |
| 621 | // original locations. |
| 622 | return newSrc; |
| 623 | } |
| 624 | |
| 625 | async function loadClientImport( |
| 626 | url: string, |
| 627 | defaultTransformSource: TransformSourceFunction, |
| 628 | ): Promise<{format: string, shortCircuit?: boolean, source: Source}> { |
| 629 | if (stashedGetSource === null) { |
| 630 | throw new Error( |
| 631 | 'Expected getSource to have been called before transformSource', |
| 632 | ); |
| 633 | } |
| 634 | // TODO: Validate that this is another module by calling getFormat. |
| 635 | const {source} = await stashedGetSource( |
| 636 | url, |
| 637 | {format: 'module'}, |
| 638 | stashedGetSource, |
| 639 | ); |
| 640 | const result = await defaultTransformSource( |
| 641 | source, |
| 642 | {format: 'module', url}, |
| 643 | defaultTransformSource, |
| 644 | ); |
| 645 | return {format: 'module', source: result.source}; |
| 646 | } |
| 647 | |
| 648 | async function transformModuleIfNeeded( |
| 649 | source: string, |
| 650 | url: string, |
| 651 | loader: LoadFunction, |
| 652 | ): Promise<string> { |
| 653 | // Do a quick check for the exact string. If it doesn't exist, don't |
| 654 | // bother parsing. |
| 655 | if ( |
| 656 | source.indexOf('use client') === -1 && |
| 657 | source.indexOf('use server') === -1 |
| 658 | ) { |
| 659 | return source; |
| 660 | } |
| 661 | |
| 662 | let sourceMappingURL = null; |
| 663 | let sourceMappingStart = 0; |
| 664 | let sourceMappingEnd = 0; |
| 665 | let sourceMappingLines = 0; |
| 666 | |
| 667 | let program; |
| 668 | try { |
| 669 | program = acorn.parse(source, { |
| 670 | ecmaVersion: '2024', |
| 671 | sourceType: 'module', |
| 672 | locations: true, |
| 673 | onComment( |
| 674 | block: boolean, |
| 675 | text: string, |
| 676 | start: number, |
| 677 | end: number, |
| 678 | startLoc: {line: number, column: number}, |
| 679 | endLoc: {line: number, column: number}, |
| 680 | ) { |
| 681 | if ( |
| 682 | text.startsWith('# sourceMappingURL=') || |
| 683 | text.startsWith('@ sourceMappingURL=') |
| 684 | ) { |
| 685 | sourceMappingURL = text.slice(19); |
| 686 | sourceMappingStart = start; |
| 687 | sourceMappingEnd = end; |
| 688 | sourceMappingLines = endLoc.line - startLoc.line; |
| 689 | } |
| 690 | }, |
| 691 | }); |
| 692 | } catch (x) { |
| 693 | // eslint-disable-next-line react-internal/no-production-logging |
| 694 | console.error('Error parsing %s %s', url, x.message); |
| 695 | return source; |
| 696 | } |
| 697 | |
| 698 | let useClient = false; |
| 699 | let useServer = false; |
| 700 | |
| 701 | const body = program.body; |
| 702 | for (let i = 0; i < body.length; i++) { |
| 703 | const node = body[i]; |
| 704 | if (node.type !== 'ExpressionStatement' || !node.directive) { |
| 705 | break; |
| 706 | } |
| 707 | if (node.directive === 'use client') { |
| 708 | useClient = true; |
| 709 | } |
| 710 | if (node.directive === 'use server') { |
| 711 | useServer = true; |
| 712 | } |
| 713 | } |
| 714 | |
| 715 | if (!useClient && !useServer) { |
| 716 | return source; |
| 717 | } |
| 718 | |
| 719 | if (useClient && useServer) { |
| 720 | throw new Error( |
| 721 | 'Cannot have both "use client" and "use server" directives in the same file.', |
| 722 | ); |
| 723 | } |
| 724 | |
| 725 | let sourceMap = null; |
| 726 | if (sourceMappingURL) { |
| 727 | const sourceMapResult = await loader( |
| 728 | sourceMappingURL, |
| 729 | // $FlowFixMe[incompatible-type] |
| 730 | { |
| 731 | format: 'json', |
| 732 | conditions: [], |
| 733 | importAssertions: {type: 'json'}, |
| 734 | importAttributes: {type: 'json'}, |
| 735 | }, |
| 736 | loader, |
| 737 | ); |
| 738 | const sourceMapString = |
| 739 | typeof sourceMapResult.source === 'string' |
| 740 | ? sourceMapResult.source |
| 741 | : // $FlowFixMe[extra-arg] |
| 742 | sourceMapResult.source.toString('utf8'); |
| 743 | sourceMap = JSON.parse(sourceMapString); |
| 744 | |
| 745 | // Strip the source mapping comment. We'll re-add it below if needed. |
| 746 | source = |
| 747 | source.slice(0, sourceMappingStart) + |
| 748 | '\n'.repeat(sourceMappingLines) + |
| 749 | source.slice(sourceMappingEnd); |
| 750 | } |
| 751 | |
| 752 | if (useClient) { |
| 753 | return transformClientModule(program, url, sourceMap, loader); |
| 754 | } |
| 755 | |
| 756 | return transformServerModule(source, program, url, sourceMap, loader); |
| 757 | } |
| 758 | |
| 759 | export async function transformSource( |
| 760 | source: Source, |
| 761 | context: TransformSourceContext, |
| 762 | defaultTransformSource: TransformSourceFunction, |
| 763 | ): Promise<{source: Source}> { |
| 764 | const transformed = await defaultTransformSource( |
| 765 | source, |
| 766 | context, |
| 767 | defaultTransformSource, |
| 768 | ); |
| 769 | if (context.format === 'module') { |
| 770 | const transformedSource = transformed.source; |
| 771 | if (typeof transformedSource !== 'string') { |
| 772 | throw new Error('Expected source to have been transformed to a string.'); |
| 773 | } |
| 774 | const newSrc = await transformModuleIfNeeded( |
| 775 | transformedSource, |
| 776 | context.url, |
| 777 | (url: string, ctx: LoadContext, defaultLoad: LoadFunction) => { |
| 778 | return loadClientImport(url, defaultTransformSource); |
| 779 | }, |
| 780 | ); |
| 781 | return {source: newSrc}; |
| 782 | } |
| 783 | return transformed; |
| 784 | } |
| 785 | |
| 786 | export async function load( |
| 787 | url: string, |
| 788 | context: LoadContext, |
| 789 | defaultLoad: LoadFunction, |
| 790 | ): Promise<{format: string, shortCircuit?: boolean, source: Source}> { |
| 791 | const result = await defaultLoad(url, context, defaultLoad); |
| 792 | if (result.format === 'module') { |
| 793 | if (typeof result.source !== 'string') { |
| 794 | throw new Error('Expected source to have been loaded into a string.'); |
| 795 | } |
| 796 | const newSrc = await transformModuleIfNeeded( |
| 797 | result.source, |
| 798 | url, |
| 799 | defaultLoad, |
| 800 | ); |
| 801 | return {format: 'module', source: newSrc}; |
| 802 | } |
| 803 | return result; |
| 804 | } |