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3d204b44f0
swc/ecmascript/minifier
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Donny/강동윤 3d204b44f0
perf(es/transforms): Make transforms parallel (#2449) 
swc_ecma_utils:
 - `collect_decls`: More parallel.

swc_ecma_transforms_macros:
 - Add `Parallel`, which is helper for `#[parallel]`.
 - Add `ParExplode`, which is helper for `#[parallel(explode)]`.

swc_ecma_transforms_macros:
 - Add `#[parllel]`.

swc_ecma_transforms_compat:
 - `sticky_regex`: Parallel.
 - `typeof_symbol`: Parallel.
 - `for_of`: Remove exponential visit.
 - `regenerator`: Remove exponential visit.
 - `object_spread`: Parallel.
 - `instance_of`: Parallel.
 - `duplicate_keys`: Parallel.
 - `logical_assignments`: Parallel.
 - `template_literal`: Parallel.
 - `block_scoped_functions`: Migrate to `VisitMut`.
 - `for_of`: Migrate to `VisitMut`.
 - `destructuring`: Reduce `Visit`.
 - `arrow`: Migrate to `VisitMut`.
 - `function_name`: Parallel.
 - `reserved_words`: Parallel.
 - `for_of`: Parallel.

swc_ecma_transforms_module:
 - `import_analyzer`: Migrate to `VisitMut`.

swc_ecma_transforms_react:
 - `jsx_src`: Parallel.
-  `jsx_self`: Migrate to `VisitMut`.
-  `jsx_self`: Parallel.

swc_ecma_transforms_proposal:
 - `export_default_from`: Migrate to `VisitMut`.

swc_ecma_transforms_optimization:
 - `inline_globals`: Parallel.
 - `json_parse`: Migrate to `VisitMut`.
 - `json_parse`: Parallel.
2021-10-18 00:03:30 +09:00
..
examples feat(es/minifer): Improve minifier (#2229) 2021-09-16 04:23:33 +00:00
scripts fix(es/minifier): Fix bugs (#2283) 2021-09-27 12:05:31 +00:00
src fix(es/minifier): Fix minification of react hooks (#2450) 2021-10-17 15:24:17 +09:00
tests fix(es/codegen): Escape backtick of synthesized template literals (#2453) 2021-10-17 20:44:21 +09:00
.eslintrc feat(es/minifier): Implement more rules (#1871) 2021-07-30 10:11:27 +09:00
.gitignore fix(es/minifier): Fix minification of react hooks (#2450) 2021-10-17 15:24:17 +09:00
Cargo.toml perf(es/transforms): Make transforms parallel (#2449) 2021-10-18 00:03:30 +09:00
package.json feat(es/minifer): Improve minifier (#2229) 2021-09-16 04:23:33 +00:00
README.md feat(es/minifier): Implement more rules (#1871) 2021-07-30 10:11:27 +09:00
yarn.lock feat(es/minifer): Improve minifier (#2229) 2021-09-16 04:23:33 +00:00

README.md

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