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const {
ArrayPrototypeJoin,
ArrayPrototypeMap,
ArrayPrototypePush,
ArrayPrototypeSome,
FunctionPrototype,
ObjectCreate,
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 {
getSourceMapsEnabled,
} = require('internal/source_map/source_map_cache');
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, importAssertions = ObjectCreate(null),
moduleProvider, isMain, inspectBrk) {
this.loader = loader;
this.importAssertions = importAssertions;
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, assertions) => {
const base = await this.loader.getBaseURL(url);
const baseURL = typeof base === 'string' ?
base :
base.resolvedHREF;
const jobPromise = this.loader.getModuleJob(specifier, baseURL, assertions);
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);
// TODO(@bcoe): Add source map support to exception that occurs as result
// of missing named export. This is currently not possible because
// stack trace originates in module_job, not the file itself. A hidden
// symbol with filename could be set in node_errors.cc to facilitate this.
if (!getSourceMapsEnabled() &&
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 { url: childFileURL } = await this.loader.resolve(
childSpecifier, parentFileUrl,
);
let format;
try {
// This might throw for non-CommonJS modules because we aren't passing
// in the import assertions and some formats require them; but we only
// care about CommonJS for the purposes of this error message.
({ format } =
await this.loader.load(childFileURL));
} catch {
// Continue regardless of error.
}
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;
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