| 1 | /** |
| 2 | * Copyright (c) Meta Platforms, Inc. and affiliates. |
| 3 | * |
| 4 | * This source code is licensed under the MIT license found in the |
| 5 | * LICENSE file in the root directory of this source tree. |
| 6 | */ |
| 7 | 'use strict'; |
| 8 | |
| 9 | const path = require('path'); |
| 10 | const semver = require('semver'); |
| 11 | |
| 12 | function resolveRelatively(importee, importer) { |
| 13 | if (semver.gte(process.version, '8.9.0')) { |
| 14 | return require.resolve(importee, { |
| 15 | paths: [path.dirname(importer)], |
| 16 | }); |
| 17 | } else { |
| 18 | // `paths` argument is not available in older Node. |
| 19 | // This works though. |
| 20 | // https://github.com/nodejs/node/issues/5963 |
| 21 | const Module = require('module'); |
| 22 | return Module._findPath(importee, [ |
| 23 | path.dirname(importer), |
| 24 | ...module.paths, |
| 25 | ]); |
| 26 | } |
| 27 | } |
| 28 | |
| 29 | let resolveCache = new Map(); |
| 30 | function useForks(forks) { |
| 31 | let resolvedForks = new Map(); |
| 32 | Object.keys(forks).forEach(srcModule => { |
| 33 | // Fork paths are relative to the project root. They must include the full |
| 34 | // path, including the extension. We intentionally don't use Node's module |
| 35 | // resolution algorithm because 1) require.resolve doesn't work with ESM |
| 36 | // modules, and 2) the behavior is easier to predict. |
| 37 | const targetModule = forks[srcModule]; |
| 38 | resolvedForks.set( |
| 39 | path.resolve(process.cwd(), srcModule), |
| 40 | // targetModule could be a string (a file path), |
| 41 | // or an error (which we'd throw if it gets used). |
| 42 | // Don't try to "resolve" errors, but cache |
| 43 | // resolved file paths. |
| 44 | typeof targetModule === 'string' |
| 45 | ? path.resolve(process.cwd(), targetModule) |
| 46 | : targetModule |
| 47 | ); |
| 48 | }); |
| 49 | return { |
| 50 | name: 'scripts/rollup/plugins/use-forks-plugin', |
| 51 | resolveId(importee, importer) { |
| 52 | if (!importer || !importee) { |
| 53 | return null; |
| 54 | } |
| 55 | if (importee.startsWith('\u0000')) { |
| 56 | // Internal Rollup reference, ignore. |
| 57 | // Passing that to Node file functions can fatal. |
| 58 | return null; |
| 59 | } |
| 60 | let resolvedImportee = null; |
| 61 | let cacheKey = `${importer}:::${importee}`; |
| 62 | if (resolveCache.has(cacheKey)) { |
| 63 | // Avoid hitting file system if possible. |
| 64 | resolvedImportee = resolveCache.get(cacheKey); |
| 65 | } else { |
| 66 | try { |
| 67 | resolvedImportee = resolveRelatively(importee, importer); |
| 68 | } catch (err) { |
| 69 | // Not our fault, let Rollup fail later. |
| 70 | } |
| 71 | if (resolvedImportee) { |
| 72 | resolveCache.set(cacheKey, resolvedImportee); |
| 73 | } |
| 74 | } |
| 75 | if (resolvedImportee && resolvedForks.has(resolvedImportee)) { |
| 76 | // We found a fork! |
| 77 | const fork = resolvedForks.get(resolvedImportee); |
| 78 | if (fork instanceof Error) { |
| 79 | throw fork; |
| 80 | } |
| 81 | return fork; |
| 82 | } |
| 83 | return null; |
| 84 | }, |
| 85 | }; |
| 86 | } |
| 87 | |
| 88 | module.exports = useForks; |