@plugjs/tsrun/dist/loader-commonjs.cjs.map

A simple TypeScript runner --------------------------

{
  "version": 3,
  "sources": ["../src/loader-commonjs.cts", "../src/loader-shared.ts"],
  "sourcesContent": ["// NodeJS dependencies\nimport _module from 'node:module'\nimport _path from 'node:path'\n\nimport {\n  CJS,\n  ESM,\n  esbTranpile,\n  logMessage,\n  moduleType,\n  throwError,\n} from './loader-shared'\n\n/* ========================================================================== *\n * CJS VERSION                                                                *\n * ========================================================================== */\n\n/** The extension handler type, loading CJS modules */\ntype ExtensionHandler = (module: NodeJS.Module, filename: string) => void\n\n/* Add the `_compile(...)` method to NodeJS' `Module` interface */\ndeclare global {\n  // eslint-disable-next-line @typescript-eslint/no-namespace\n  namespace NodeJS {\n    interface Module {\n      _compile: (contents: string, filename: string) => void\n    }\n  }\n}\n\n/**\n * Add the `_extensions[...]` and `resolveFilename(...)` members to the\n * definition of `node:module`.\n */\ndeclare module 'node:module' {\n  const _extensions: Record<`.${string}`, ExtensionHandler>\n  function _resolveFilename(\n    request: string,\n    parent: _module | undefined,\n    isMain: boolean,\n    options?: any,\n  ): string\n}\n\n/* ========================================================================== */\n\nconst _type = moduleType(CJS)\n\nconst loader: ExtensionHandler = (module, filename): void => {\n  logMessage(CJS, `Attempting to load \"${filename}\"`)\n\n  /* Figure our the extension (\".ts\" or \".cts\")... */\n  const ext = _path.extname(filename)\n\n  /* If the file is a \".ts\", we need to figure out the default type */\n  if (ext === '.ts') {\n    /* If the _default_ module type is CJS then load as such! */\n    if (_type === ESM) {\n      throwError(CJS, `Must use import to load ES Module: ${filename}`, { code: 'ERR_REQUIRE_ESM' })\n    }\n  } else if (ext !== '.cts') {\n    throwError(CJS, `Unsupported filename \"${filename}\"`)\n  }\n\n  const source = esbTranpile(filename, CJS)\n\n  /* Let node do its thing, but wrap any error it throws */\n  try {\n    module._compile(source, filename)\n  } catch (cause) {\n    console.error(`Error compiling module \"${filename}\"`, cause)\n  }\n}\n\n/**\n * Replace _module._resolveFilename with our own.\n *\n * This is a _HACK BEYOND REDEMPTION_ and I'm ashamed of even _thinking_ about\n * it, but, well, it makes things work.\n *\n * TypeScript allows us to import \"./foo.js\", and internally resolves this to\n * \"./foo.ts\" (yeah, nice, right?) and while we normally wouldn't want to deal\n * with this kind of stuff, the \"node16\" module resolution mode _forces_ us to\n * use this syntax.\n *\n * And we _need_ the \"node16\" module resolution to properly consume \"export\n * conditions\" from other packages. Since ESBuild's plugins only work in async\n * mode, changing those import statements on the fly is out of the question, so\n * we need to hack our way into Node's own resolver.\n *\n * See my post: https://twitter.com/ianosh/status/1559484168685379590\n * ESBuild related fix: https://github.com/evanw/esbuild/commit/0cdc005e3d1c765a084f206741bc4bff78e30ec4\n */\nconst _oldResolveFilename = _module._resolveFilename\n_module._resolveFilename = function(\n    request: string,\n    parent: _module | undefined,\n    ...args: [ isMain: boolean, options: any ]\n): any {\n  try {\n    /* First call the old _resolveFilename to see what Node thinks */\n    return _oldResolveFilename.call(this, request, parent, ...args)\n  } catch (error: any) {\n    /* If the error was anything but \"MODULE_NOT_FOUND\" bail out */\n    if (error.code !== 'MODULE_NOT_FOUND') throw error\n\n    /* Check if the \"request\" ends with \".js\", \".mjs\" or \".cjs\" */\n    const match = request.match(/(.*)(\\.[mc]?js$)/)\n\n    /*\n     * If the file matches our extension, _and_ we have a parent, we simply\n     * try with a new extension (e.g. \".js\" becomes \".ts\")...\n     */\n    if (parent && match) {\n      const [ , name, ext ] = match\n      const tsrequest = name + ext!.replace('js', 'ts')\n      try {\n        const result = _oldResolveFilename.call(this, tsrequest, parent, ...args)\n        logMessage(CJS, `Resolution for \"${request}\" intercepted as \"${tsrequest}`)\n        return result\n      } catch {\n        throw error // throw the _original_ error in this case\n      }\n    }\n\n    /* We have no parent, or we don't match our extension, throw! */\n    throw error\n  }\n}\n\n/* ========================================================================== */\n\n/* Remember to load our loader for .TS/.CTS as CommonJS modules */\n_module._extensions['.ts'] = _module._extensions['.cts'] = loader\nlogMessage(CJS, 'TypeScript loader for CommonJS loaded')\n", "/* eslint-disable @typescript-eslint/no-unsafe-function-type */\n/* ========================================================================== *\n * HACK BEYOND REDEMPTION: TRANSPILE .ts FILES (the esm loader)               *\n * -------------------------------------------------------------------------- *\n * Use ESBuild to quickly transpile TypeScript files into JavaScript.         *\n *                                                                            *\n * The plan as it stands is as follows:                                       *\n * - `.mts` files always get transpiled to ESM modules                        *\n * - `.cts` files always get transpiled to CJS modules                        *\n * - `.ts` files are treanspiled according to what's in `package.json`        *\n *                                                                            *\n * Additionally, when transpiling to ESM modules, we can't rely on the magic  *\n * that Node's `require(...)` call uses to figure out which file to import.   *\n * We need to _actually verify_ on disk what's the correct file to import.    *\n *                                                                            *\n * This is a single module, only available as ESM, and it will _both_ behave  *\n * as a NodeJS' loader, _and_ inject the CJS extension handlers (hack) found  *\n * in the `_extensions` of `node:module` (same as `require.extensions`).      *\n * ========================================================================== */\n\n// NodeJS dependencies\nimport _fs from 'node:fs'\nimport _path from 'node:path'\nimport _util from 'node:util'\n\n// ESBuild is the only external dependency\nimport _esbuild from 'esbuild'\n\n/* ========================================================================== *\n * CONSTANTS AND TYPES                                                        *\n * ========================================================================== */\n\n/** Supported types from `package.json` */\nexport type Type = 'commonjs' | 'module'\n/** Constant identifying a `commonjs` module */\nexport const CJS = 'commonjs' as const\n/** Constant identifying an ESM `module` */\nexport const ESM = 'module' as const\n\n/* ========================================================================== *\n * DEBUGGING AND ERRORS                                                       *\n * ========================================================================== */\n\n/** Setup debugging */\nconst _debugLog = _util.debuglog('plug:ts-loader')\nconst _debug = _debugLog.enabled\n\n/** Emit some logs if `DEBUG_TS_LOADER` is set to `true` */\nexport function logMessage(mode: Type, arg: string, ...args: any []): void {\n  if (! _debug) return\n\n  const t = mode === ESM ? 'esm' : mode === CJS ? 'cjs' : '---'\n  _debugLog(`[${t}] ${arg}`, ...args)\n}\n\n/** Fail miserably */\nexport function throwError(\n    mode: Type,\n    message: string,\n    options: { start?: Function, code?: string, cause?: any } = {},\n): never {\n  const t = mode === ESM ? 'esm' : mode === CJS ? 'cjs' : '---'\n  const prefix = `[ts-loader|${t}|pid=${process.pid}]`\n\n  const { start = throwError, ...extra } = options\n  const error = new Error(`${prefix} ${message}`)\n  Error.captureStackTrace(error, start)\n  Object.assign(error, extra)\n\n  throw error\n}\n\n/* ========================================================================== *\n * MODULE TYPES AND FORCING TYPE                                              *\n * ========================================================================== */\n\n/**\n * Determine the current module type to transpile .TS files as looking at the\n * `__TS_LOADER_FORCE_TYPE` environment variable (used by PlugJS and CLI) or,\n * if unspecified, looking at the `type` field in the `package.json` file.\n */\nexport function moduleType(mode: Type): Type {\n  if (process.env.__TS_LOADER_FORCE_TYPE) {\n    const type = process.env.__TS_LOADER_FORCE_TYPE\n    if ((type === CJS) || (type === ESM)) {\n      logMessage(mode, `Forcing type to \"${type}\" from environment`)\n      return type\n    } else {\n      throwError(mode, `Invalid type \"${process.env.__TS_LOADER_FORCE_TYPE}\"`)\n    }\n  }\n\n  const _findType = (directory: string): Type => {\n    const packageFile = _path.join(directory, 'package.json')\n    try {\n      const packageData = _fs.readFileSync(packageFile, 'utf-8')\n      const packageJson = JSON.parse(packageData)\n      const packageType = packageJson.type\n      switch (packageType) {\n        case undefined:\n          logMessage(mode, `File \"${packageFile}\" does not declare a default type`)\n          return CJS\n\n        case CJS:\n        case ESM:\n          logMessage(mode, `File \"${packageFile}\" declares type as \"${CJS}\"`)\n          return packageType\n\n        default:\n          logMessage(mode, `File \"${packageFile}\" specifies unknown type \"${packageType}\"`)\n          return CJS\n      }\n    } catch (cause: any) {\n      if ((cause.code !== 'ENOENT') && (cause.code !== 'EISDIR')) {\n        throwError(mode, `Unable to read or parse \"${packageFile}\"`, { cause, start: _findType })\n      }\n    }\n\n    const parent = _path.dirname(directory)\n    if (directory !== parent) return _findType(directory)\n\n    logMessage(mode, `Type defaulted to \"${CJS}\"`)\n    return CJS\n  }\n\n  return _findType(process.cwd())\n}\n\n/* ========================================================================== *\n * ESBUILD HELPERS                                                            *\n * ========================================================================== */\n\n/**\n * Take an ESBuild `BuildResult` or `BuildFailure` (they both have arrays\n * of `Message` in both `warnings` and `errors`), format them and print them\n * out nicely. Then fail if any error was detected.\n */\nfunction _esbReport(\n    kind: 'error' | 'warning',\n    messages: _esbuild.Message[] = [],\n): void {\n  const output = process.stderr\n  const options = { color: !!output.isTTY, terminalWidth: output.columns || 80 }\n\n  const array = _esbuild.formatMessagesSync(messages, { kind, ...options })\n  array.forEach((message) => output.write(`${message}\\n`))\n}\n\n/**\n * Transpile with ESBuild\n */\nexport function esbTranpile(filename: string, type: Type): string {\n  logMessage(type, `Transpiling \"${filename}\" as \"${type}\"`)\n\n  const [ format, __fileurl ] = type === ESM ?\n    [ 'esm', 'import.meta.url' ] as const :\n    [ 'cjs', '__filename' ] as const\n\n  /* ESbuild options */\n  const options: _esbuild.TransformOptions = {\n    sourcefile: filename, // the original filename we're parsing\n    format, // what are we actually transpiling to???\n    loader: 'ts', // the format is always \"typescript\"\n    sourcemap: 'inline', // always inline source maps\n    sourcesContent: false, // do not include sources content in sourcemap\n    platform: 'node', // d'oh! :-)\n    minifyWhitespace: true, // https://github.com/evanw/esbuild/releases/tag/v0.16.14\n    logLevel: 'silent', // catching those in our _esbReport below\n    target: `node${process.versions['node']}`, // target _this_ version\n    define: { __fileurl }, // from \"globals.d.ts\"\n  }\n\n  /* Emit a line on the console when loading in debug mode */\n  if (_debug) {\n    if (format === 'esm') {\n      options.banner = `;(await import('node:util')).debuglog('plug:ts-loader')('[esm] Loaded \"%s\"', ${__fileurl});`\n    } else if (format === 'cjs') {\n      options.banner = `;require('node:util').debuglog('plug:ts-loader')('[cjs] Loaded \"%s\"', ${__fileurl});`\n    }\n  }\n\n  /* Transpile our TypeScript file into some JavaScript stuff */\n  let result\n  try {\n    const source = _fs.readFileSync(filename, 'utf-8')\n    result = _esbuild.transformSync(source, options)\n  } catch (cause: any) {\n    _esbReport('error', (cause as _esbuild.TransformFailure).errors)\n    _esbReport('warning', (cause as _esbuild.TransformFailure).warnings)\n    throwError(type, `ESBuild error transpiling \"${filename}\"`, { cause, start: esbTranpile })\n  }\n\n  /* Log transpile warnings if debugging */\n  if (_debug) _esbReport('warning', result.warnings)\n\n  /* Done! */\n  return result.code\n}\n\n\n/* ========================================================================== *\n * UTILITIES                                                                  *\n * ========================================================================== */\n\n/* Returns a boolean indicating whether the specified file exists or not */\nexport function isFile(path: string): boolean {\n  try {\n    return _fs.statSync(path).isFile()\n  } catch {\n    return false\n  }\n}\n\n/* Returns a boolean indicating whether the specified directory exists or not */\nexport function isDirectory(path: string): boolean {\n  try {\n    return _fs.statSync(path).isDirectory()\n  } catch {\n    return false\n  }\n}\n"],
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}