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const {
ArrayPrototypeForEach,
ArrayPrototypeMap,
Boolean,
JSONParse,
ObjectGetPrototypeOf,
ObjectPrototypeHasOwnProperty,
ObjectKeys,
SafeArrayIterator,
SafeMap,
SafeSet,
StringPrototypeReplace,
StringPrototypeSlice,
StringPrototypeStartsWith,
SyntaxErrorPrototype,
globalThis: { WebAssembly },
} = primordials;
let _TYPES = null;
function lazyTypes() {
if (_TYPES !== null) return _TYPES;
return _TYPES = require('internal/util/types');
}
const { readFileSync } = require('fs');
const { extname, isAbsolute } = require('path');
const {
hasEsmSyntax,
loadNativeModule,
stripBOM,
} = require('internal/modules/cjs/helpers');
const {
Module: CJSModule,
cjsParseCache
} = require('internal/modules/cjs/loader');
const internalURLModule = require('internal/url');
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 asyncESM = require('internal/process/esm_loader');
const { emitWarningSync } = require('internal/process/warning');
const { TextDecoder } = require('internal/encoding');
let cjsParse;
async function initCJSParse() {
if (typeof WebAssembly === 'undefined') {
cjsParse = require('internal/deps/cjs-module-lexer/lexer').parse;
} else {
const { parse, init } =
require('internal/deps/cjs-module-lexer/dist/lexer');
try {
await init();
cjsParse = parse;
} catch {
cjsParse = require('internal/deps/cjs-module-lexer/lexer').parse;
}
}
}
const translators = new SafeMap();
exports.translators = translators;
exports.enrichCJSError = enrichCJSError;
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 }, assertions) {
return asyncESM.esmLoader.import(specifier, url, assertions);
}
// Strategy for loading a standard JavaScript module.
translators.set('module', async function moduleStrategy(url, source, isMain) {
assertBufferSource(source, true, 'load');
source = stringify(source);
maybeCacheSourceMap(url, source);
debug(`Translating StandardModule ${url}`);
const module = new ModuleWrap(url, undefined, source, 0, 0);
moduleWrap.callbackMap.set(module, {
initializeImportMeta: (meta, wrap) => this.importMetaInitialize(meta, { url }),
importModuleDynamically,
});
return module;
});
/**
* @param {Error | any} err
* @param {string} [content] Content of the file, if known.
* @param {string} [filename] Useful only if `content` is unknown.
*/
function enrichCJSError(err, content, filename) {
if (err != null && ObjectGetPrototypeOf(err) === SyntaxErrorPrototype &&
hasEsmSyntax(content || readFileSync(filename, 'utf-8'))) {
// Emit the warning synchronously because we are in the middle of handling
// a SyntaxError that will throw and likely terminate the process before an
// asynchronous warning would be emitted.
emitWarningSync(
'To load an ES module, set "type": "module" in the package.json or use ' +
'the .mjs extension.'
);
}
}
// Strategy for loading a node-style CommonJS module
const isWindows = process.platform === 'win32';
const winSepRegEx = /\//g;
translators.set('commonjs', async function commonjsStrategy(url, source,
isMain) {
debug(`Translating CJSModule ${url}`);
let filename = internalURLModule.fileURLToPath(new URL(url));
if (isWindows)
filename = StringPrototypeReplace(filename, winSepRegEx, '\\');
if (!cjsParse) await initCJSParse();
const { module, exportNames } = cjsPreparseModuleExports(filename);
const namesWithDefault = exportNames.has('default') ?
[...exportNames] : ['default', ...exportNames];
return new ModuleWrap(url, undefined, namesWithDefault, function() {
debug(`Loading CJSModule ${url}`);
let exports;
if (asyncESM.esmLoader.cjsCache.has(module)) {
exports = asyncESM.esmLoader.cjsCache.get(module);
asyncESM.esmLoader.cjsCache.delete(module);
} else {
try {
exports = CJSModule._load(filename, undefined, isMain);
} catch (err) {
enrichCJSError(err, undefined, filename);
throw err;
}
}
for (const exportName of exportNames) {
if (!ObjectPrototypeHasOwnProperty(exports, exportName) ||
exportName === 'default')
continue;
// We might trigger a getter -> dont fail.
let value;
try {
value = exports[exportName];
} catch {
// Continue regardless of error.
}
this.setExport(exportName, value);
}
this.setExport('default', exports);
});
});
function cjsPreparseModuleExports(filename) {
let module = CJSModule._cache[filename];
if (module) {
const cached = cjsParseCache.get(module);
if (cached)
return { module, exportNames: cached.exportNames };
}
const loaded = Boolean(module);
if (!loaded) {
module = new CJSModule(filename);
module.filename = filename;
module.paths = CJSModule._nodeModulePaths(module.path);
CJSModule._cache[filename] = module;
}
let source;
try {
source = readFileSync(filename, 'utf8');
} catch {
// Continue regardless of error.
}
let exports, reexports;
try {
({ exports, reexports } = cjsParse(source || ''));
} catch {
exports = [];
reexports = [];
}
const exportNames = new SafeSet(new SafeArrayIterator(exports));
// Set first for cycles.
cjsParseCache.set(module, { source, exportNames, loaded });
if (reexports.length) {
module.filename = filename;
module.paths = CJSModule._nodeModulePaths(module.path);
}
ArrayPrototypeForEach(reexports, (reexport) => {
let resolved;
try {
resolved = CJSModule._resolveFilename(reexport, module);
} catch {
return;
}
const ext = extname(resolved);
if ((ext === '.js' || ext === '.cjs' || !CJSModule._extensions[ext]) &&
isAbsolute(resolved)) {
const { exportNames: reexportNames } = cjsPreparseModuleExports(resolved);
for (const name of reexportNames)
exportNames.add(name);
}
});
return { module, exportNames };
}
// 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);
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, source) {
emitExperimentalWarning('Importing JSON modules');
assertBufferSource(source, true, 'load');
debug(`Loading JSONModule ${url}`);
const pathname = StringPrototypeStartsWith(url, '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);
});
}
}
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, source) {
emitExperimentalWarning('Importing WebAssembly modules');
assertBufferSource(source, false, 'load');
debug(`Translating WASMModule ${url}`);
let compiled;
try {
compiled = await WebAssembly.compile(source);
} catch (err) {
err.message = errPath(url) + ': ' + err.message;
throw err;
}
const imports =
ArrayPrototypeMap(WebAssembly.Module.imports(compiled),
({ module }) => module);
const exports =
ArrayPrototypeMap(WebAssembly.Module.exports(compiled),
({ 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;
});
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