69 lines
2.4 KiB
JavaScript
69 lines
2.4 KiB
JavaScript
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"use strict";
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var __importDefault = (this && this.__importDefault) || function (mod) {
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return (mod && mod.__esModule) ? mod : { "default": mod };
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};
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.makeHook = void 0;
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var vm_1 = __importDefault(require("vm"));
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exports.makeHook = function (cfg, wrapper, callback) {
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// Hook into Node's `require(...)`
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updateHooks();
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// Patch the vm module to watch files executed via one of these methods:
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if (cfg.vm) {
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patch(vm_1.default, 'createScript', 1);
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patch(vm_1.default, 'runInThisContext', 1);
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patch(vm_1.default, 'runInNewContext', 2);
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patch(vm_1.default, 'runInContext', 2);
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}
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/**
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* Patch the specified method to watch the file at the given argument
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* index.
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*/
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function patch(obj, method, optionsArgIndex) {
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var orig = obj[method];
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if (!orig)
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return;
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obj[method] = function () {
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var opts = arguments[optionsArgIndex];
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var file = null;
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if (opts) {
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file = typeof opts == 'string' ? opts : opts.filename;
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}
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if (file)
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callback(file);
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return orig.apply(this, arguments);
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};
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}
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/**
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* (Re-)install hooks for all registered file extensions.
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*/
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function updateHooks() {
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Object.keys(require.extensions).forEach(function (ext) {
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var fn = require.extensions[ext];
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if (typeof fn === 'function' && fn.name !== 'nodeDevHook') {
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require.extensions[ext] = createHook(fn);
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}
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});
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}
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/**
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* Returns a function that can be put into `require.extensions` in order to
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* invoke the callback when a module is required for the first time.
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*/
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function createHook(handler) {
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return function nodeDevHook(module, filename) {
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if (module.parent === wrapper) {
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// If the main module is required conceal the wrapper
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module.id = '.';
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module.parent = null;
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process.mainModule = module;
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}
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if (!module.loaded)
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callback(module.filename);
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// Invoke the original handler
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handler(module, filename);
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// Make sure the module did not hijack the handler
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updateHooks();
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};
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}
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};
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