95 lines
2.4 KiB
JavaScript
95 lines
2.4 KiB
JavaScript
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// Unless explicitly stated otherwise all files in this repository are licensed under the Apache 2.0 License.
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//
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// This product includes software developed at Datadog (https://www.datadoghq.com/). Copyright 2021 Datadog, Inc.
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const path = require('path')
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const parse = require('module-details-from-path')
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const { fileURLToPath } = require('url')
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const {
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importHooks,
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specifiers,
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toHook
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} = require('./lib/register')
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function addHook (hook) {
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importHooks.push(hook)
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toHook.forEach(([name, namespace]) => hook(name, namespace))
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}
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function removeHook (hook) {
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const index = importHooks.indexOf(hook)
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if (index > -1) {
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importHooks.splice(index, 1)
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}
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}
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function callHookFn (hookFn, namespace, name, baseDir) {
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const newDefault = hookFn(namespace, name, baseDir)
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if (newDefault && newDefault !== namespace) {
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namespace.default = newDefault
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}
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}
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function Hook (modules, options, hookFn) {
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if ((this instanceof Hook) === false) return new Hook(modules, options, hookFn)
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if (typeof modules === 'function') {
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hookFn = modules
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modules = null
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options = null
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} else if (typeof options === 'function') {
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hookFn = options
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options = null
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}
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const internals = options ? options.internals === true : false
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this._iitmHook = (name, namespace) => {
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const filename = name
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const isBuiltin = name.startsWith('node:')
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let baseDir
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if (isBuiltin) {
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name = name.replace(/^node:/, '')
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} else {
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if (name.startsWith('file://')) {
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try {
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name = fileURLToPath(name)
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} catch (e) {}
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}
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const details = parse(name)
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if (details) {
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name = details.name
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baseDir = details.basedir
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}
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}
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if (modules) {
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for (const moduleName of modules) {
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if (moduleName === name) {
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if (baseDir) {
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if (internals) {
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name = name + path.sep + path.relative(baseDir, fileURLToPath(filename))
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} else {
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if (!baseDir.endsWith(specifiers.get(filename))) continue
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}
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}
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callHookFn(hookFn, namespace, name, baseDir)
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}
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}
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} else {
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callHookFn(hookFn, namespace, name, baseDir)
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}
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}
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addHook(this._iitmHook)
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}
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Hook.prototype.unhook = function () {
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removeHook(this._iitmHook)
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}
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module.exports = Hook
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module.exports.Hook = Hook
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module.exports.addHook = addHook
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module.exports.removeHook = removeHook
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