123 lines
5.0 KiB
JavaScript
123 lines
5.0 KiB
JavaScript
// Copied from several files in node's source code.
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// https://github.com/nodejs/node/blob/2d5d77306f6dff9110c1f77fefab25f973415770/lib/internal/modules/cjs/loader.js
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// Each function and variable below must have a comment linking to the source in node's github repo.
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const path = require('path');
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const packageJsonReader = require('./node-package-json-reader');
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const {JSONParse} = require('./node-primordials');
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module.exports.assertScriptCanLoadAsCJSImpl = assertScriptCanLoadAsCJSImpl;
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// copied from Module._extensions['.js']
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// https://github.com/nodejs/node/blob/v15.3.0/lib/internal/modules/cjs/loader.js#L1113-L1120
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function assertScriptCanLoadAsCJSImpl(filename) {
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const pkg = readPackageScope(filename);
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// Function require shouldn't be used in ES modules.
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if (pkg && pkg.data && pkg.data.type === 'module') {
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const parentPath = module.parent && module.parent.filename;
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const packageJsonPath = path.resolve(pkg.path, 'package.json');
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throw createErrRequireEsm(filename, parentPath, packageJsonPath);
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}
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}
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// Copied from https://github.com/nodejs/node/blob/2d5d77306f6dff9110c1f77fefab25f973415770/lib/internal/modules/cjs/loader.js#L285-L301
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function readPackageScope(checkPath) {
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const rootSeparatorIndex = checkPath.indexOf(path.sep);
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let separatorIndex;
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while (
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(separatorIndex = checkPath.lastIndexOf(path.sep)) > rootSeparatorIndex
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) {
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checkPath = checkPath.slice(0, separatorIndex);
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if (checkPath.endsWith(path.sep + 'node_modules'))
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return false;
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const pjson = readPackage(checkPath);
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if (pjson) return {
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path: checkPath,
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data: pjson
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};
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}
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return false;
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}
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// Copied from https://github.com/nodejs/node/blob/2d5d77306f6dff9110c1f77fefab25f973415770/lib/internal/modules/cjs/loader.js#L249
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const packageJsonCache = new Map();
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// Copied from https://github.com/nodejs/node/blob/v15.3.0/lib/internal/modules/cjs/loader.js#L275-L304
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function readPackage(requestPath) {
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const jsonPath = path.resolve(requestPath, 'package.json');
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const existing = packageJsonCache.get(jsonPath);
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if (existing !== undefined) return existing;
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const result = packageJsonReader.read(jsonPath);
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const json = result.containsKeys === false ? '{}' : result.string;
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if (json === undefined) {
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packageJsonCache.set(jsonPath, false);
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return false;
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}
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try {
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const parsed = JSONParse(json);
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const filtered = {
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name: parsed.name,
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main: parsed.main,
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exports: parsed.exports,
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imports: parsed.imports,
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type: parsed.type
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};
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packageJsonCache.set(jsonPath, filtered);
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return filtered;
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} catch (e) {
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e.path = jsonPath;
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e.message = 'Error parsing ' + jsonPath + ': ' + e.message;
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throw e;
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}
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}
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// Native ERR_REQUIRE_ESM Error is declared here:
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// https://github.com/nodejs/node/blob/2d5d77306f6dff9110c1f77fefab25f973415770/lib/internal/errors.js#L1294-L1313
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// Error class factory is implemented here:
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// function E: https://github.com/nodejs/node/blob/2d5d77306f6dff9110c1f77fefab25f973415770/lib/internal/errors.js#L323-L341
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// function makeNodeErrorWithCode: https://github.com/nodejs/node/blob/2d5d77306f6dff9110c1f77fefab25f973415770/lib/internal/errors.js#L251-L278
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// The code below should create an error that matches the native error as closely as possible.
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// Third-party libraries which attempt to catch the native ERR_REQUIRE_ESM should recognize our imitation error.
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function createErrRequireEsm(filename, parentPath, packageJsonPath) {
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const code = 'ERR_REQUIRE_ESM'
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const err = new Error(getMessage(filename, parentPath, packageJsonPath))
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// Set `name` to be used in stack trace, generate stack trace with that name baked in, then re-declare the `name` field.
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// This trick is copied from node's source.
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err.name = `Error [${ code }]`
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err.stack
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Object.defineProperty(err, 'name', {
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value: 'Error',
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enumerable: false,
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writable: true,
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configurable: true
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})
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err.code = code
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return err
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// Copy-pasted from https://github.com/nodejs/node/blob/b533fb3508009e5f567cc776daba8fbf665386a6/lib/internal/errors.js#L1293-L1311
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// so that our error message is identical to the native message.
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function getMessage(filename, parentPath = null, packageJsonPath = null) {
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const ext = path.extname(filename)
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let msg = `Must use import to load ES Module: ${filename}`;
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if (parentPath && packageJsonPath) {
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const path = require('path');
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const basename = path.basename(filename) === path.basename(parentPath) ?
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filename : path.basename(filename);
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msg +=
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'\nrequire() of ES modules is not supported.\nrequire() of ' +
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`${filename} ${parentPath ? `from ${parentPath} ` : ''}` +
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`is an ES module file as it is a ${ext} file whose nearest parent ` +
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`package.json contains "type": "module" which defines all ${ext} ` +
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'files in that package scope as ES modules.\nInstead ' +
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'change the requiring code to use ' +
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'import(), or remove "type": "module" from ' +
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`${packageJsonPath}.\n`;
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return msg;
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}
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return msg;
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}
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}
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