swc/crates/swc_ecma_minifier

Minifier

EcmaScript minifier for the swc project. This is basically a port of terser.

Note

Currently name mangler is very simple. To focus on creating a MVP, I (kdy1) will use simple logic for name mangler and implement the content-aware name mangler after publishing first non-beta version.

Testing

Real-library tests

You can use vscode to see diffs. Select a file from tests/projects/output and select the corresponding file from tests/projects/refs. Then you can right click to see an option to open diff.

Splitting a library test

Extracting only subset from a library test makes development much easier.

Split status:

• angular-1.2.5
• backbone-1.1.0
• jquery-1.9.1
• jquery.mobile-1.4.2
• mootools-1.4.5
• underscore-1.5.2
• yui-3.12.0

Tests from terser

Tests ported from terser has

• input.js
• config.json
• mangle.json (if name mangling is enabled)
• output.js (if exists and can be modified if our one is better or due to lack of frequency-aware base54)
• output.terser.js (if exists)

Copying tests

Replace the content of terser/test/compress.js with it of scripts/compress.js and run npm run test:compress