Minification

Minification is the process of compressing your code to reduce its size and improve performance by removing unnecessary characters, such as whitespace, comments, and unused code.

You can enable minification in tsdown using the --minify option:

tsdown --minify

NOTE

The minification feature is based on Oxc, which is currently in alpha and can still have bugs. We recommend thoroughly testing your output in production environments.

Example

Given the following input code:

src/index.ts

const x = 1

function hello(x: number) {
  console.log('Hello World')
  console.log(x)
}

hello(x)

Here are the two possible outputs, depending on whether minification is enabled:

dist/index.mjs (without --minify)

//#region src/index.ts
const x = 1
function hello(x$1) {
  console.log('Hello World')
  console.log(x$1)
}
hello(x)

//#endregion

dist/index.mjs (with --minify)

const e=1;function t(e){console.log(`Hello World`),console.log(e)}t(e);