metro-minify-terser

What is metro-minify-terser?

The metro-minify-terser package is a minifier for JavaScript and TypeScript code. It is based on the Terser minification library and is used within the Metro bundler, which is commonly used with React Native applications. The package provides code minification which helps in reducing the size of the codebase, leading to faster load times and better performance in production environments.

What are metro-minify-terser's main functionalities?

Code Minification

This feature allows you to minify JavaScript or TypeScript code, which includes mangling variable names, removing comments, and other optimizations to reduce the size of the code.

const metroMinifyTerser = require('metro-minify-terser');

async function minifyCode(code) {
  const result = await metroMinifyTerser.minify(code, {
    mangle: true, // Change variable names to shorter ones
    keep_classnames: false, // Do not keep class names
    keep_fnames: false, // Do not keep function names
    output: {
      ascii_only: true, // Encode non-ASCII characters as \uXXXX
      comments: false, // Remove comments
      semicolons: true, // Use semicolons to separate statements
    },
  });
  return result.code;
}

// Example usage
const originalCode = 'function add(a, b) { return a + b; }';
minifyCode(originalCode).then(minifiedCode => {
  console.log(minifiedCode);
});

Other packages similar to metro-minify-terser

uglify-js

uglify-js is a widely-used JavaScript parser, minifier, compressor, and beautifier toolkit. It is similar to metro-minify-terser in its ability to minify JavaScript code, but it does not support ES6+ syntax as well as Terser-based tools.

babel-minify

babel-minify is a minifier based on the Babel toolchain. It leverages the Babel ecosystem to provide minification features. It is similar to metro-minify-terser but is more tightly integrated with Babel, which might be beneficial in projects already using Babel for transpilation.

terser

terser is the underlying library that metro-minify-terser is based on. It provides comprehensive JavaScript minification capabilities and is widely used in the JavaScript community. The main difference is that metro-minify-terser is tailored for integration with the Metro bundler.

esbuild

esbuild is an extremely fast JavaScript bundler and minifier. It performs similar functions to metro-minify-terser but is known for its speed due to being written in Go. It is a more comprehensive tool as it also includes bundling capabilities.