The @swc/core-darwin-arm64 npm package is a precompiled binary of SWC (Speedy Web Compiler) specifically for macOS on ARM64 architecture. SWC is a super-fast compiler written in Rust that compiles JavaScript/TypeScript down to efficient, optimized JavaScript code. It is designed to be used as a faster alternative to Babel and can perform tasks such as transpilation, minification, and bundling.

What are @swc/core-darwin-arm64's main functionalities?

Transpilation

Transpiles TypeScript or modern JavaScript to a specified ECMAScript target version. The code sample demonstrates how to transpile TypeScript code to ES5.

const { transformSync } = require('@swc/core-darwin-arm64');

const sourceCode = `const x: number = 1;`;
const output = transformSync(sourceCode, {
  filename: 'example.ts',
  jsc: {
    parser: {
      syntax: 'typescript',
    },
    target: 'es5',
  },
});

console.log(output.code);

Minification

Minifies JavaScript code to reduce file size by removing unnecessary characters and renaming variables. The code sample shows how to minify a simple function.

const { minifySync } = require('@swc/core-darwin-arm64');

const sourceCode = `function add(a, b) { return a + b; }`;
const minified = minifySync(sourceCode, {
  compress: true,
  mangle: true
});

console.log(minified.code);

Source Maps

Generates source maps to help with debugging by mapping the transformed code back to the original source code. The code sample demonstrates generating a source map for a file.

const { transformFileSync } = require('@swc/core-darwin-arm64');

const result = transformFileSync('input.js', {
  sourceMaps: true,
  filename: 'input.js',
  jsc: {
    target: 'es5'
  }
});

console.log(result.map);

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