typescript-transform-paths

typescript-transform-paths

Transform module resolution paths in compiled output source to conform with TypeScript internal resolution via tsconfig.json settings (paths, rootDirs, baseUrl)

Install

# NPM
npm i -D typescript-transform-paths

# Yarn
yarn add -D typescript-transform-paths

Usage with ttypescript or ts-patch

Add it to plugins in your tsconfig.json

Example Config

{
  "compilerOptions": {
    "baseUrl": "./",
    "paths": {
      "@utils/*": ["utils/*"]
    },
    "plugins": [
      // Transform paths in output .js files
      { "transform": "typescript-transform-paths" },

      // Transform paths in output .d.ts files (Include this line if you output declarations files)
      { "transform": "typescript-transform-paths", "afterDeclarations": true }
    ]
  }
}

core/index.ts

import { sum } from "@utils/sum";
sum(2, 3);

core/index.js (compiled output)

// core/index.js
var sum_1 = require("../utils/sum");
sum_1.sum(2, 3);

Virtual Directories

TS allows defining virtual directories via the rootDirs compiler option.
To enable virtual directory mapping, use the useRootDirs plugin option.

{
  "compilerOptions": {
    "rootDirs": [ "src", "generated" ],
    "baseUrl": ".",
    "paths": {
      "#root/*": [ "./src/*", "./generated/*" ]
    },
    "plugins": [
      { "transform": "typescript-transform-paths", "useRootDirs": true },
      { "transform": "typescript-transform-paths", "useRootDirs": true, "afterDeclarations": true }
    ]
  }
}

Example

- src/
    - subdir/
      - sub-file.ts
    - file1.ts
- generated/
    - file2.ts

src/file1.ts

import '#root/file2.ts' // resolves to './file2'

src/subdir/sub-file.ts

import '#root/file2.ts' // resolves to '../file2'
import '#root/file1.ts' // resolves to '../file1'

Custom Control

Exclusion patterns

You can disable transformation for paths based on the resolved file path. The exclude option allows specifying glob patterns to match against resolved file path.

For an example context in which this would be useful, see Issue #83

Example:

{
  "compilerOptions": {
    "paths": {
      "sub-module1/*": [ "../../node_modules/sub-module1/*" ],
      "sub-module2/*": [ "../../node_modules/sub-module2/*" ],
    },
    "plugins": [
      { 
        "transform": "typescript-transform-paths", 
        "useRootDirs": true, 
        exclude: [ "**/node_modules/**" ]
      }
    ]
  }
}

// This path will not be transformed
import * as sm1 from 'sub-module1/index'

@transform-path tag

Use the @transform-path tag to explicitly specify the output path for a single statement.

// @transform-path https://cdnjs.cloudflare.com/ajax/libs/react/17.0.1/umd/react.production.min.js
import react from 'react' // Output path will be the url above

@no-transform-path

Use the @no-transform-path tag to explicitly disable transformation for a single statement.

// @no-transform-path
import 'normally-transformed' // This will remain 'normally-transformed', even though it has a different value in paths config

Articles

• Node Consumable Modules With Typescript Paths by oleersoy

Project Guidelines for Contributors

• Package Manager: yarn (yarn install)
• Commit messages: Conventional Commit Specs
• Format before commit: prettier (yarn run format)
• Releases: standard-version (yarn run release)

Maintainers

Ron S.

Daniel Perez Alvarez

Contributors

Thanks goes to these wonderful people (emoji key):

Daniel Perez Alvarez 💻 🚧 ⚠️	Михайлов Антон 💻 🐛 ⚠️	Joshua Avalon 🐛 📦	Robert Laverty 🐛 ⚠️	Ole Ersoy 🐛 📝	sbmw 🐛	richardspence 🐛
Vitaly Pinchuk 🐛	laij84 🐛	dko-slapdash 🐛	hedwiggggg 🐛 ⚠️ 💻	kuskoman 📖	alex weidner 🐛	Ron S. 🐛 ⚠️ 💻
Vladimir Yakovlev 🐛	vwpo 🐛

This project follows the all-contributors specification. Contributions of any kind welcome!

Changelog

2.2.0 (2021-01-04)

Features

• Add overwriteNodeModules option (b4a483e)
• Added @transform-path and @no-transform-path tags for custom statement level transformation (8cab30d)
• Added exclude option to allow excluding transformation of matching resolved paths (b1fdb54)

Bug Fixes

• Certain edge cases existed where type elision improperly elided full import / export declarations without named bindings (closes #87) (84a7866)