mirror of
https://github.com/swc-project/swc.git
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68e9017376
swc_ecma_transforms_optimization: - `expr_simplifier`: Track more changes. swc_ecma_minifier: - Analyze after applying the pure optimizer. - Preserve access to a variable not in scope. - `compress`: Remove string literal if it was not a directive. - `pure/collapse_vars`: Merge vars declared in the first statement into one with initializers if `collapse_vars` and `join_vars` are enabled. - `unused`: Use `usage_count` instead of `ref_count`. - `unused`: Fix dropping rule for member expressions. - `unused`: Fix dropping rule for declarations. - `hoist_props`: Preserve exported items. |
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| examples | ||
| inputs | ||
| scripts | ||
| src | ||
| tests | ||
| .eslintrc | ||
| .gitignore | ||
| Cargo.toml | ||
| package.json | ||
| README.md | ||
| yarn.lock | ||
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