tsc-alias

Replace alias paths with relative paths after typescript compilation. You can add aliases that reference other projects outside your tsconfig.json project by providing a relative path to the baseUrl.

Comparison to tsconfig-paths

+ Compile time (no runtime dependencies)

Getting Started

First, install tsc-alias as devDependency using npm.

npm install -g tsc-alias

npm install --save-dev tsc-alias

Add it to your build scripts in package.json

"scripts": {
  "build": "tsc --project tsconfig.json && tsc-alias -p tsconfig.json",
}

or

"scripts": {
  "build": "tsc && tsc-alias",
  "build:watch": "tsc && (concurrently \"tsc -w\" \"tsc-alias -w\")"
}

CLI

To display all available options:

tsc-alias --help

Issues

If you have an issue, please create one. But, before:

• try to check the FAQ.
• try to check if there are any related issues
• try to run with --debug and check if config is correctly loaded and all sourcefiles are found.

API

Installation

npm install tsc-alias

Usage

import { replaceTscAliasPaths } from 'tsc-alias';

replaceTscAliasPaths(options?);

Here are all the available options:

Configuration via tsconfig.json Example

{
  "compilerOptions": {
    ...
  },
  "tsc-alias": {
    "verbose": false,
    "resolveFullPaths": true,
    "replacers": {
      "exampleReplacer": {
        "enabled": true,
        "file": "./exampleReplacer.js"
      },
      "otherReplacer": {
        "enabled": true,
        "file": "./otherReplacer.js"
      }
    },
    "fileExtensions": {
      "inputGlob": "{js,jsx,mjs}",
      "outputCheck": ["js", "json", "jsx", "mjs"]
    }
  }
}

Single file replacer

We can use tsc-alias in a single file, with a function that returns the modified contents.

We prepare the replacer with prepareSingleFileReplaceTscAliasPaths(), passing the same options that we would pass to replaceTscAliasPaths(). That will return a promise of a function that receives the file contents and path, and returns the transformed contents, synchronously.

import { prepareSingleFileReplaceTscAliasPaths } from 'tsc-alias';

const runFile: SingleFileReplacer = await prepareSingleFileReplaceTscAliasPaths(options?);

function treatFile(filePath: string) {
  const fileContents = fs.readFileSync(filePath, 'utf8');
  const newContents = runFile({fileContents, filePath});
  // do stuff with newContents
}