Transform compiled source module resolution paths using TypeScript's paths config, and/or custom resolution paths.

<yarn|npm|pnpm> add -D typescript-transform-paths

Add it to plugins in your tsconfig.json

{
  "compilerOptions": {
    "baseUrl": "./",
    // Configure your path mapping here
    "paths": {
      "@utils/*": ["utils/*"]
    },
    // Note: To transform paths for both the output .js and .d.ts files, you need both of the below entries
    "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

// The following transforms path to '../utils/sum'
import { sum } from "@utils/sum";

• Compile with tsc — Use ts-patch

• Use with ts-node — Add typescript-transform-paths/register to require config.

  tsconfig.json

  {
    "ts-node": {
      "transpileOnly": true,
      "require": [ "typescript-transform-paths/register" ],
    },
    "compilerOptions" { /* ... */ }
  }

• Use with node — Use the register script: node -r typescript-transform-paths/register src/index.ts

• Use with NX — Add the typescript-transform-paths/nx-transformer to project config

  project.json

  {
    /* ... */
    "targets": {
      "build": {
        /* ... */
        "options": {
          /* ... */
          "transformers": [
            { 
              "name": "typescript-transform-paths/nx-transformer",
              "options": { "afterDeclarations": true }
            }
          ]
        }
      }
    }
  }

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 }
    ]
  }
}

- 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'

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", 
        "exclude": [ "**/node_modules/**" ]
      }
    ]
  }
}

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

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

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

• Node Consumable Modules With Typescript Paths by oleersoy

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

• NodeJS subpath imports
• Yarn link: protocol

Ron S.

Daniel Perez Alvarez