All files / lib/internal/modules/esm module_job.js

100% Statements 204/204
100% Branches 48/48
100% Functions 7/7
100% Lines 204/204

Press n or j to go to the next uncovered block, b, p or k for the previous block.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 135x 9x 9x 9x 135x 135x 135x 135x 135x 135x 135x 135x 618x 618x 618x 618x 618x 618x 618x 618x 618x 618x 618x 617x 601x 601x 601x 601x 601x 601x 601x 601x 434x 434x 434x 424x 601x 601x 601x 601x 590x 590x 618x 618x 618x 618x 618x 618x 618x 618x 618x 618x 618x 135x 135x 253x 231x 231x 253x 253x 135x 135x 231x 231x 649x 30x 30x 619x 619x 596x 596x 231x 231x 208x 208x 231x 1x 1x 1x 219x 207x 207x 231x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 11x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 11x 11x 11x 197x 214x 569x 569x 569x 569x 231x 135x 135x 253x 218x 218x 218x 218x 237x 21x 21x 8x 8x 8x 2x 2x 8x 8x 8x 8x 4x 8x 8x 4x 4x 4x 4x 4x 4x 8x 21x 21x 190x 253x 135x 135x 135x  
'use strict';
 
const {
  ArrayPrototypeJoin,
  ArrayPrototypeMap,
  ArrayPrototypePush,
  ArrayPrototypeSome,
  FunctionPrototype,
  ObjectSetPrototypeOf,
  PromiseAll,
  PromiseResolve,
  PromisePrototypeCatch,
  ReflectApply,
  RegExpPrototypeTest,
  SafeArrayIterator,
  SafeSet,
  StringPrototypeIncludes,
  StringPrototypeMatch,
  StringPrototypeReplace,
  StringPrototypeSplit,
  StringPrototypeStartsWith,
} = primordials;
 
const { ModuleWrap } = internalBinding('module_wrap');
 
const { decorateErrorStack } = require('internal/util');
const assert = require('internal/assert');
const resolvedPromise = PromiseResolve();
 
const noop = FunctionPrototype;
 
let hasPausedEntry = false;
 
const CJSGlobalLike = [
  'require',
  'module',
  'exports',
  '__filename',
  '__dirname',
];
const isCommonJSGlobalLikeNotDefinedError = (errorMessage) =>
  ArrayPrototypeSome(
    CJSGlobalLike,
    (globalLike) => errorMessage === `${globalLike} is not defined`
  );
 
/* A ModuleJob tracks the loading of a single Module, and the ModuleJobs of
 * its dependencies, over time. */
class ModuleJob {
  // `loader` is the Loader instance used for loading dependencies.
  // `moduleProvider` is a function
  constructor(loader, url, moduleProvider, isMain, inspectBrk) {
    this.loader = loader;
    this.isMain = isMain;
    this.inspectBrk = inspectBrk;
 
    this.module = undefined;
    // Expose the promise to the ModuleWrap directly for linking below.
    // `this.module` is also filled in below.
    this.modulePromise = ReflectApply(moduleProvider, loader, [url, isMain]);
 
    // Wait for the ModuleWrap instance being linked with all dependencies.
    const link = async () => {
      this.module = await this.modulePromise;
      assert(this.module instanceof ModuleWrap);
 
      // Explicitly keeping track of dependency jobs is needed in order
      // to flatten out the dependency graph below in `_instantiate()`,
      // so that circular dependencies can't cause a deadlock by two of
      // these `link` callbacks depending on each other.
      const dependencyJobs = [];
      const promises = this.module.link(async (specifier) => {
        const jobPromise = this.loader.getModuleJob(specifier, url);
        ArrayPrototypePush(dependencyJobs, jobPromise);
        const job = await jobPromise;
        return job.modulePromise;
      });
 
      if (promises !== undefined)
        await PromiseAll(new SafeArrayIterator(promises));
 
      return PromiseAll(new SafeArrayIterator(dependencyJobs));
    };
    // Promise for the list of all dependencyJobs.
    this.linked = link();
    // This promise is awaited later anyway, so silence
    // 'unhandled rejection' warnings.
    PromisePrototypeCatch(this.linked, noop);
 
    // instantiated == deep dependency jobs wrappers are instantiated,
    // and module wrapper is instantiated.
    this.instantiated = undefined;
  }
 
  instantiate() {
    if (this.instantiated === undefined) {
      this.instantiated = this._instantiate();
    }
    return this.instantiated;
  }
 
  async _instantiate() {
    const jobsInGraph = new SafeSet();
    const addJobsToDependencyGraph = async (moduleJob) => {
      if (jobsInGraph.has(moduleJob)) {
        return;
      }
      jobsInGraph.add(moduleJob);
      const dependencyJobs = await moduleJob.linked;
      return PromiseAll(new SafeArrayIterator(
        ArrayPrototypeMap(dependencyJobs, addJobsToDependencyGraph)));
    };
    await addJobsToDependencyGraph(this);
 
    try {
      if (!hasPausedEntry && this.inspectBrk) {
        hasPausedEntry = true;
        const initWrapper = internalBinding('inspector').callAndPauseOnStart;
        initWrapper(this.module.instantiate, this.module);
      } else {
        this.module.instantiate();
      }
    } catch (e) {
      decorateErrorStack(e);
      if (StringPrototypeIncludes(e.message,
                                  ' does not provide an export named')) {
        const splitStack = StringPrototypeSplit(e.stack, '\n');
        const parentFileUrl = StringPrototypeReplace(
          splitStack[0],
          /:\d+$/,
          ''
        );
        const { 1: childSpecifier, 2: name } = StringPrototypeMatch(
          e.message,
          /module '(.*)' does not provide an export named '(.+)'/);
        const childFileURL =
            await this.loader.resolve(childSpecifier, parentFileUrl);
        const format = await this.loader.getFormat(childFileURL);
        if (format === 'commonjs') {
          const importStatement = splitStack[1];
          // TODO(@ctavan): The original error stack only provides the single
          // line which causes the error. For multi-line import statements we
          // cannot generate an equivalent object destructuring assignment by
          // just parsing the error stack.
          const oneLineNamedImports = StringPrototypeMatch(importStatement, /{.*}/);
          const destructuringAssignment = oneLineNamedImports &&
              StringPrototypeReplace(oneLineNamedImports, /\s+as\s+/g, ': ');
          e.message = `Named export '${name}' not found. The requested module` +
            ` '${childSpecifier}' is a CommonJS module, which may not support` +
            ' all module.exports as named exports.\nCommonJS modules can ' +
            'always be imported via the default export, for example using:' +
            `\n\nimport pkg from '${childSpecifier}';\n${
              destructuringAssignment ?
                `const ${destructuringAssignment} = pkg;\n` : ''}`;
          const newStack = StringPrototypeSplit(e.stack, '\n');
          newStack[3] = `SyntaxError: ${e.message}`;
          e.stack = ArrayPrototypeJoin(newStack, '\n');
        }
      }
      throw e;
    }
 
    for (const dependencyJob of jobsInGraph) {
      // Calling `this.module.instantiate()` instantiates not only the
      // ModuleWrap in this module, but all modules in the graph.
      dependencyJob.instantiated = resolvedPromise;
    }
  }
 
  async run() {
    await this.instantiate();
    const timeout = -1;
    const breakOnSigint = false;
    try {
      await this.module.evaluate(timeout, breakOnSigint);
    } catch (e) {
      if (e?.name === 'ReferenceError' &&
          isCommonJSGlobalLikeNotDefinedError(e.message)) {
        e.message += ' in ES module scope';
 
        if (StringPrototypeStartsWith(e.message, 'require ')) {
          e.message += ', you can use import instead';
        }
 
        const packageConfig =
          StringPrototypeStartsWith(this.module.url, 'file://') &&
            RegExpPrototypeTest(/\.js(\?[^#]*)?(#.*)?$/, this.module.url) &&
            require('internal/modules/esm/resolve')
              .getPackageScopeConfig(this.module.url);
        if (packageConfig.type === 'module') {
          e.message +=
            '\nThis file is being treated as an ES module because it has a ' +
            `'.js' file extension and '${packageConfig.pjsonPath}' contains ` +
            '"type": "module". To treat it as a CommonJS script, rename it ' +
            'to use the \'.cjs\' file extension.';
        }
      }
      throw e;
    }
    return { module: this.module };
  }
}
ObjectSetPrototypeOf(ModuleJob.prototype, null);
module.exports = ModuleJob;