118 lines
4.5 KiB
JavaScript
118 lines
4.5 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.addHook = addHook;
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var _module = _interopRequireDefault(require("module"));
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var _path = _interopRequireDefault(require("path"));
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var _nodeModulesRegexp = _interopRequireDefault(require("node-modules-regexp"));
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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/* (c) 2015 Ari Porad (@ariporad) <http://ariporad.com>. License: ariporad.mit-license.org */
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// Guard against poorly mocked module constructors.
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const Module = module.constructor.length > 1 ? module.constructor : _module.default;
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const HOOK_RETURNED_NOTHING_ERROR_MESSAGE = '[Pirates] A hook returned a non-string, or nothing at all! This is a' + ' violation of intergalactic law!\n' + '--------------------\n' + 'If you have no idea what this means or what Pirates is, let me explain: ' + 'Pirates is a module that makes is easy to implement require hooks. One of' + " the require hooks you're using uses it. One of these require hooks" + " didn't return anything from it's handler, so we don't know what to" + ' do. You might want to debug this.';
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function shouldCompile(filename, exts, matcher, ignoreNodeModules) {
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if (typeof filename !== 'string') {
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return false;
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}
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if (exts.indexOf(_path.default.extname(filename)) === -1) {
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return false;
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}
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const resolvedFilename = _path.default.resolve(filename);
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if (ignoreNodeModules && _nodeModulesRegexp.default.test(resolvedFilename)) {
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return false;
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}
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if (matcher && typeof matcher === 'function') {
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return !!matcher(resolvedFilename);
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}
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return true;
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}
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/**
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* Add a require hook.
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*
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* @param {Function} hook - The hook. Accepts the code of the module and the filename. Required.
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* @param {Object} [opts] - Options
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* @param {String[]} [opts.exts=['.js']] - The extensions to hook. Should start with '.' (ex. ['.js']).
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* @param {Function(path)} [opts.matcher] - A matcher function, will be called with path to a file. Should return truthy if the file should be hooked, falsy otherwise.
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* @param {Boolean} [opts.ignoreNodeModules=true] - Auto-ignore node_modules. Independent of any matcher.
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* @returns {Function} revert - Reverts the hooks.
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*/
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function addHook(hook, opts = {}) {
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let reverted = false;
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const loaders = [];
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const oldLoaders = [];
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let exts; // We need to do this to fix #15. Basically, if you use a non-standard extension (ie. .jsx), then
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// We modify the .js loader, then use the modified .js loader for as the base for .jsx.
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// This prevents that.
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const originalJSLoader = Module._extensions['.js'];
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const matcher = opts.matcher || null;
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const ignoreNodeModules = opts.ignoreNodeModules !== false;
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exts = opts.extensions || opts.exts || opts.extension || opts.ext || ['.js'];
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if (!Array.isArray(exts)) {
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exts = [exts];
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}
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exts.forEach(ext => {
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if (typeof ext !== 'string') {
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throw new TypeError(`Invalid Extension: ${ext}`);
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}
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const oldLoader = Module._extensions[ext] || originalJSLoader;
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oldLoaders[ext] = oldLoader;
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loaders[ext] = Module._extensions[ext] = function newLoader(mod, filename) {
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let compile;
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if (!reverted) {
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if (shouldCompile(filename, exts, matcher, ignoreNodeModules)) {
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compile = mod._compile;
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mod._compile = function _compile(code) {
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// reset the compile immediately as otherwise we end up having the
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// compile function being changed even though this loader might be reverted
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// Not reverting it here leads to long useless compile chains when doing
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// addHook -> revert -> addHook -> revert -> ...
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// The compile function is also anyway created new when the loader is called a second time.
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mod._compile = compile;
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const newCode = hook(code, filename);
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if (typeof newCode !== 'string') {
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throw new Error(HOOK_RETURNED_NOTHING_ERROR_MESSAGE);
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}
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return mod._compile(newCode, filename);
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};
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}
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}
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oldLoader(mod, filename);
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};
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});
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return function revert() {
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if (reverted) return;
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reverted = true;
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exts.forEach(ext => {
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// if the current loader for the extension is our loader then unregister it and set the oldLoader again
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// if not we can not do anything as we cannot remove a loader from within the loader-chain
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if (Module._extensions[ext] === loaders[ext]) {
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Module._extensions[ext] = oldLoaders[ext];
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}
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});
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};
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} |