xref: /expo/packages/@expo/metro-config/build/transform-worker/transform-worker.js.map (revision b7b31bfc)

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All rights reserved.\n * Copyright (c) Meta Platforms, Inc. and affiliates.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n */\nimport { FBSourceFunctionMap, MetroSourceMapSegmentTuple } from 'metro-source-map';\nimport worker, {\n  JsTransformerConfig,\n  JsTransformOptions,\n  TransformResponse,\n} from 'metro-transform-worker';\n\nimport { wrapDevelopmentCSS } from './css';\nimport { matchCssModule, transformCssModuleWeb } from './css-modules';\nimport { transformPostCssModule } from './postcss';\nimport { compileSass, matchSass } from './sass';\n\nconst countLines = require('metro/src/lib/countLines') as (string: string) => number;\n\ntype JSFileType = 'js/script' | 'js/module' | 'js/module/asset';\n\ntype JsOutput = {\n  data: {\n    code: string;\n    lineCount: number;\n    map: MetroSourceMapSegmentTuple[];\n    functionMap: FBSourceFunctionMap | null;\n  };\n  type: JSFileType;\n};\n\nexport async function transform(\n  config: JsTransformerConfig,\n  projectRoot: string,\n  filename: string,\n  data: Buffer,\n  options: JsTransformOptions\n): Promise<TransformResponse> {\n  const isCss = options.type !== 'asset' && /\\.(s?css|sass)$/.test(filename);\n  // If the file is not CSS, then use the default behavior.\n  if (!isCss) {\n    return worker.transform(config, projectRoot, filename, data, options);\n  }\n\n  // If the platform is not web, then return an empty module.\n  if (options.platform !== 'web') {\n    const code = matchCssModule(filename) ? 'module.exports={};' : '';\n    return worker.transform(\n      config,\n      projectRoot,\n      filename,\n      // TODO: Native CSS Modules\n      Buffer.from(code),\n      options\n    );\n  }\n\n  let code = data.toString('utf8');\n\n  // Apply postcss transforms\n  code = await transformPostCssModule(projectRoot, {\n    src: code,\n    filename,\n  });\n\n  // TODO: When native has CSS support, this will need to move higher up.\n  const syntax = matchSass(filename);\n  if (syntax) {\n    code = compileSass(projectRoot, { filename, src: code }, { syntax }).src;\n  }\n\n  // If the file is a CSS Module, then transform it to a JS module\n  // in development and a static CSS file in production.\n  if (matchCssModule(filename)) {\n    const results = await transformCssModuleWeb({\n      filename,\n      src: code,\n      options: {\n        projectRoot,\n        dev: options.dev,\n        minify: options.minify,\n        sourceMap: false,\n      },\n    });\n\n    const jsModuleResults = await worker.transform(\n      config,\n      projectRoot,\n      filename,\n      Buffer.from(results.output),\n      options\n    );\n\n    const cssCode = results.css.toString();\n    const output: JsOutput[] = [\n      {\n        type: 'js/module',\n        data: {\n          // @ts-expect-error\n          ...jsModuleResults.output[0]?.data,\n\n          // Append additional css metadata for static extraction.\n          css: {\n            code: cssCode,\n            lineCount: countLines(cssCode),\n            map: [],\n            functionMap: null,\n          },\n        },\n      },\n    ];\n\n    return {\n      dependencies: jsModuleResults.dependencies,\n      output,\n    };\n  }\n\n  // Global CSS:\n\n  const { transform } = await import('lightningcss');\n\n  // TODO: Add bundling to resolve imports\n  // https://lightningcss.dev/bundling.html#bundling-order\n\n  const cssResults = transform({\n    filename,\n    code: Buffer.from(code),\n    sourceMap: false,\n    cssModules: false,\n    projectRoot,\n    minify: options.minify,\n  });\n\n  // TODO: Warnings:\n  // cssResults.warnings.forEach((warning) => {\n  // });\n\n  // Create a mock JS module that exports an empty object,\n  // this ensures Metro dependency graph is correct.\n  const jsModuleResults = await worker.transform(\n    config,\n    projectRoot,\n    filename,\n    options.dev ? Buffer.from(wrapDevelopmentCSS({ src: code, filename })) : Buffer.from(''),\n    options\n  );\n\n  const cssCode = cssResults.code.toString();\n\n  // In production, we export the CSS as a string and use a special type to prevent\n  // it from being included in the JS bundle. We'll extract the CSS like an asset later\n  // and append it to the HTML bundle.\n  const output: JsOutput[] = [\n    {\n      type: 'js/module',\n      data: {\n        // @ts-expect-error\n        ...jsModuleResults.output[0]?.data,\n\n        // Append additional css metadata for static extraction.\n        css: {\n          code: cssCode,\n          lineCount: countLines(cssCode),\n          map: [],\n          functionMap: null,\n        },\n      },\n    },\n  ];\n\n  return {\n    dependencies: jsModuleResults.dependencies,\n    output,\n  };\n}\n\n/**\n * A custom Metro transformer that adds support for processing Expo-specific bundler features.\n * - Global CSS files on web.\n * - CSS Modules on web.\n * - TODO: Tailwind CSS on web.\n */\nmodule.exports = {\n  // Use defaults for everything that's not custom.\n  ...worker,\n  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