forked from nodejs/node
/
translators.js
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/
translators.js
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'use strict';
/* global WebAssembly */
const {
JSONParse,
ObjectKeys,
PromisePrototypeCatch,
PromiseReject,
SafeMap,
StringPrototypeReplace,
StringPrototypeSlice,
StringPrototypeStartsWith,
} = primordials;
let _TYPES = null;
function lazyTypes() {
if (_TYPES !== null) return _TYPES;
return _TYPES = require('internal/util/types');
}
const {
stripBOM,
loadNativeModule
} = require('internal/modules/cjs/helpers');
const CJSModule = require('internal/modules/cjs/loader').Module;
const internalURLModule = require('internal/url');
const { defaultGetSource } = require(
'internal/modules/esm/get_source');
const { defaultTransformSource } = require(
'internal/modules/esm/transform_source');
const createDynamicModule = require(
'internal/modules/esm/create_dynamic_module');
const { fileURLToPath, URL } = require('url');
let debug = require('internal/util/debuglog').debuglog('esm', (fn) => {
debug = fn;
});
const { emitExperimentalWarning } = require('internal/util');
const {
ERR_UNKNOWN_BUILTIN_MODULE,
ERR_INVALID_RETURN_PROPERTY_VALUE
} = require('internal/errors').codes;
const { maybeCacheSourceMap } = require('internal/source_map/source_map_cache');
const moduleWrap = internalBinding('module_wrap');
const { ModuleWrap } = moduleWrap;
const { getOptionValue } = require('internal/options');
const experimentalImportMetaResolve =
getOptionValue('--experimental-import-meta-resolve');
const translators = new SafeMap();
exports.translators = translators;
const asyncESM = require('internal/process/esm_loader');
let DECODER = null;
function assertBufferSource(body, allowString, hookName) {
if (allowString && typeof body === 'string') {
return;
}
const { isArrayBufferView, isAnyArrayBuffer } = lazyTypes();
if (isArrayBufferView(body) || isAnyArrayBuffer(body)) {
return;
}
throw new ERR_INVALID_RETURN_PROPERTY_VALUE(
`${allowString ? 'string, ' : ''}array buffer, or typed array`,
hookName,
'source',
body
);
}
function stringify(body) {
if (typeof body === 'string') return body;
assertBufferSource(body, false, 'transformSource');
DECODER = DECODER === null ? new TextDecoder() : DECODER;
return DECODER.decode(body);
}
function errPath(url) {
const parsed = new URL(url);
if (parsed.protocol === 'file:') {
return fileURLToPath(parsed);
}
return url;
}
async function importModuleDynamically(specifier, { url }) {
return asyncESM.ESMLoader.import(specifier, url);
}
function createImportMetaResolve(defaultParentUrl) {
return async function resolve(specifier, parentUrl = defaultParentUrl) {
return PromisePrototypeCatch(
asyncESM.ESMLoader.resolve(specifier, parentUrl),
(error) => (
error.code === 'ERR_UNSUPPORTED_DIR_IMPORT' ?
error.url : PromiseReject(error))
);
};
}
function initializeImportMeta(meta, { url }) {
// Alphabetical
if (experimentalImportMetaResolve)
meta.resolve = createImportMetaResolve(url);
meta.url = url;
}
// Strategy for loading a standard JavaScript module
translators.set('module', async function moduleStrategy(url) {
let { source } = await this._getSource(
url, { format: 'module' }, defaultGetSource);
assertBufferSource(source, true, 'getSource');
({ source } = await this._transformSource(
source, { url, format: 'module' }, defaultTransformSource));
source = stringify(source);
maybeCacheSourceMap(url, source);
debug(`Translating StandardModule ${url}`);
const module = new ModuleWrap(url, undefined, source, 0, 0);
moduleWrap.callbackMap.set(module, {
initializeImportMeta,
importModuleDynamically,
});
return module;
});
// Strategy for loading a node-style CommonJS module
const isWindows = process.platform === 'win32';
const winSepRegEx = /\//g;
translators.set('commonjs', function commonjsStrategy(url, isMain) {
debug(`Translating CJSModule ${url}`);
return new ModuleWrap(url, undefined, ['default'], function() {
debug(`Loading CJSModule ${url}`);
const pathname = internalURLModule.fileURLToPath(new URL(url));
let exports;
const cachedModule = CJSModule._cache[pathname];
if (cachedModule && asyncESM.ESMLoader.cjsCache.has(cachedModule)) {
exports = asyncESM.ESMLoader.cjsCache.get(cachedModule);
asyncESM.ESMLoader.cjsCache.delete(cachedModule);
} else {
exports = CJSModule._load(pathname, undefined, isMain);
}
this.setExport('default', exports);
});
});
// Strategy for loading a node builtin CommonJS module that isn't
// through normal resolution
translators.set('builtin', async function builtinStrategy(url) {
debug(`Translating BuiltinModule ${url}`);
// Slice 'node:' scheme
const id = StringPrototypeSlice(url, 5);
const module = loadNativeModule(id, url, true);
if (!StringPrototypeStartsWith(url, 'node:') || !module) {
throw new ERR_UNKNOWN_BUILTIN_MODULE(url);
}
debug(`Loading BuiltinModule ${url}`);
return module.getESMFacade();
});
// Strategy for loading a JSON file
translators.set('json', async function jsonStrategy(url) {
emitExperimentalWarning('Importing JSON modules');
debug(`Translating JSONModule ${url}`);
debug(`Loading JSONModule ${url}`);
const pathname = url.startsWith('file:') ? fileURLToPath(url) : null;
let modulePath;
let module;
if (pathname) {
modulePath = isWindows ?
StringPrototypeReplace(pathname, winSepRegEx, '\\') : pathname;
module = CJSModule._cache[modulePath];
if (module && module.loaded) {
const exports = module.exports;
return new ModuleWrap(url, undefined, ['default'], function() {
this.setExport('default', exports);
});
}
}
let { source } = await this._getSource(
url, { format: 'json' }, defaultGetSource);
assertBufferSource(source, true, 'getSource');
({ source } = await this._transformSource(
source, { url, format: 'json' }, defaultTransformSource));
source = stringify(source);
if (pathname) {
// A require call could have been called on the same file during loading and
// that resolves synchronously. To make sure we always return the identical
// export, we have to check again if the module already exists or not.
module = CJSModule._cache[modulePath];
if (module && module.loaded) {
const exports = module.exports;
return new ModuleWrap(url, undefined, ['default'], function() {
this.setExport('default', exports);
});
}
}
try {
const exports = JSONParse(stripBOM(source));
module = {
exports,
loaded: true
};
} catch (err) {
// TODO (BridgeAR): We could add a NodeCore error that wraps the JSON
// parse error instead of just manipulating the original error message.
// That would allow to add further properties and maybe additional
// debugging information.
err.message = errPath(url) + ': ' + err.message;
throw err;
}
if (pathname) {
CJSModule._cache[modulePath] = module;
}
return new ModuleWrap(url, undefined, ['default'], function() {
debug(`Parsing JSONModule ${url}`);
this.setExport('default', module.exports);
});
});
// Strategy for loading a wasm module
translators.set('wasm', async function(url) {
emitExperimentalWarning('Importing Web Assembly modules');
let { source } = await this._getSource(
url, { format: 'wasm' }, defaultGetSource);
assertBufferSource(source, false, 'getSource');
({ source } = await this._transformSource(
source, { url, format: 'wasm' }, defaultTransformSource));
assertBufferSource(source, false, 'transformSource');
debug(`Translating WASMModule ${url}`);
let compiled;
try {
compiled = await WebAssembly.compile(source);
} catch (err) {
err.message = errPath(url) + ': ' + err.message;
throw err;
}
const imports =
WebAssembly.Module.imports(compiled).map(({ module }) => module);
const exports = WebAssembly.Module.exports(compiled).map(({ name }) => name);
return createDynamicModule(imports, exports, url, (reflect) => {
const { exports } = new WebAssembly.Instance(compiled, reflect.imports);
for (const expt of ObjectKeys(exports))
reflect.exports[expt].set(exports[expt]);
}).module;
});