mirror of https://github.com/swc-project/swc.git synced 2024-12-19 03:31:45 +03:00

feat(es/minifier): Implement more rules (#1871 )

swc_ecma_codegen:
 - Fix codegen of `U+0028` and `U+0029`. 

swc_ecma_minifier:
 - Implement MVP.

swc_ecma_transforms_base:
 - `fixer`: Handle seq/await in rhs of for-of.

2021-07-30 10:11:27 +09:00

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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

1.2 KiB Raw Blame History