Advices for minifying a TS library.

[RichardMoralesLuis]

Hey! I'm currently working on improve the build of my library. It is currently created on TS and I developed it for sharing some utilities between other projects of my company.

Now I'm using Webpack 5 and I would like to move it to SWC. After some tests the building is faster and I'm happy with the time but I have a concern with the minify. With Webpack 5 using ts-loader the output is only 175KB, but if I use SWC the output is 253KB, so maybe I'm doing something wrong.

Could anyone help me with some advices?

Here is my .swcrc

.swcrc

{
  "$schema": "https://json.schemastore.org/swcrc",
  "minify": true,
  "jsc": {
    "target": "es2016", // Versión de ECMAScript a la que compilar el código
    "parser": {
    "syntax": "typescript", // Indica que estás utilizando TypeScript,
    "tsx": false,
    },
    "minify": {
      "compress": {
        "unused": true
      },
      "mangle": true
    }
  },
}

And this is the script that I used for building the app.

build.sh

#!/usr/bin/env bash

set -eu

echo -e "***** Start build *****"

yarn clean

tsc
yarn build-swc

Note: I'm using TSC because I need to create the .d.ts files

In the package.json I have

npx swc ./src -o dist/index.js --config-file .swcrc

Thanks in advance! 😄