PostBuild.

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PostBuild is a utility pacakge for TypeScript that runs useful tasks after transpiling TypeScript into ESM and CJS JavaScript file.

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Installation

Install the pacakge as a dev. dependency:

npm i --save-dev @nasriya/postbuild

Config File

The postbuild.configs.json is the file where all your configurations reside, and is needed to perform the tasks or the build process will fail.

If you don't have a file, just run the following command and a file will be generated with recommended configurations:

npm run postbuild-init

Config File Content

The above comand will generate a file with all the features set to their recommended values. This table below explains them in details.

Property	Description	Posible values	Default value
esmDir	The directory of the generated ESM folder.	auto or the directory	auto
cjsDir	The directory of the generated CJS folder.	auto or the directory	auto
verbose	An option to enable logging extra details .	true or false	true
addExtensions	Appending .js to all import statements.	true or false	true
copyFiles	An options object to copy assets to the dist folder after transpiling.	object or undefined	Notice below
copyFiles.from	The directory where you want to copy the assets to.	directory	src
copyFiles.exclude	An array of file extensions to exclude.	string[]	['.ts']
aliases	Define aliases to your imports	Record<string, string>	Nothing

The default configurations works well if your project is structured like this:

├── dist/
│   ├── @types
│   ├── cjs
│   └── esm
├── src
│   ├── folder1
│   ├── folder2
│   ├── folder3
│   └── index.ts
├── package.json
└── README.md

Usage

The best way to use this package is to integrate it with your build process by appending the postbuild worker to the end of the build command:

// package.json
{
    "scripts": {
        "build": "npm run build:esm && npm run build:cjs && postbuild",
        "build:esm": "tsc --project tsconfig.esm.json",
        "build:cjs": "tsc --project tsconfig.cjs.json",        
    }
}

Defining aliases

In postbuild.config.json, you can add your aliases as such:

{
    "aliases": {
        "my-module": "/modules/my-module",
        "@elements/*": "/elements/"
    }
}

Using __dirname

All __dirname matches in ESM will be replaced with import.meta.dirname, for example:

// TypeScript
const dirname: string = __dirname;

Will be compiled to:

// CommonJS (CJS)
const dirname = __dirname;

// ECMAScript Modules (ESM)
const dirname = import.meta.dirname;

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License

Please read the license from here.