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Optional try catch binding (#422)
swc_ecma_parser: - Add test for optional try catch binding swc_ecma_transforms: - Implement optional catch binding (#411)
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README.md
129
README.md
@ -25,8 +25,6 @@
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</a>
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</p>
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<h2 align="center">Supporting swc</h2>
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<p align="center">
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@ -38,7 +36,6 @@
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</a>
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</p>
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swc is a community-driven project, and is maintained by a group of [volunteers](https://opencollective.com/swc#team). If you'd like to help support the future of the project, please consider:
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- Giving developer time on the project. (Message us on [Slack](https://swc-org.slack.com/) for guidance!)
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@ -69,7 +66,6 @@ Become a sponsor and get your logo on our README on Github with a link to your s
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<a href="https://opencollective.com/swc/backer/8/website?requireActive=false" target="_blank"><img src="https://opencollective.com/swc/backer/8/avatar.svg?requireActive=false"></a>
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<a href="https://opencollective.com/swc/backer/9/website?requireActive=false" target="_blank"><img src="https://opencollective.com/swc/backer/9/avatar.svg?requireActive=false"></a>
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# Documentation
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Check out the documentation [in the website](https://swc-project.github.io/docs/installation).
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@ -77,75 +73,82 @@ Check out the documentation [in the website](https://swc-project.github.io/docs/
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# Features
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## Parsers
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- [x] es2019
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- [x] jsx
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- [x] typescript
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- [x] es2019
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- [x] jsx
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- [x] typescript
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## Transforms
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New generation javascript to old-days javascript.
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- es3
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- [x] member-expression-literals
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- [x] property-literals
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- [x] reserved-words
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- es3
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- es5
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- [ ] property-mutators
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- [x] member-expression-literals
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- [x] property-literals
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- [x] reserved-words
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- es2015
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- [x] arrow-functions
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- [x] block-scoped-functions
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- [x] block-scoping
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- [x] classes
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- [x] computed-properties
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- [x] destructuring
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- [x] duplicate-keys
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- [x] for-of
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- [x] function-name
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- [x] instanceof
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- [x] literals
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- [x] new-target
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- [ ] object-super
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- [x] parameters
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- [x] shorthand-properties
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- [x] spread
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- [x] sticky regex (`y` flag)
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- [x] template-literals
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- [ ] invalid escape sequences inside tagged template literals. (aka es2018)
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- [x] typeof-symbol
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- [ ] unicode-regex
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- es5
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- es2016
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- [x] exponentiation-operator
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- [ ] property-mutators
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- es2017
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- [x] async-to-generator
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- es2015
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- es2018
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- [ ] async-generator-functions
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- [ ] dotall-regex
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- [x] object-rest-spread
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- [ ] Using symbol as a key
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- [ ] optional-catch-binding
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- [ ] unicode-property-regex
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- react
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- [x] jsx
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- [x] arrow-functions
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- [x] block-scoped-functions
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- [x] block-scoping
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- [x] classes
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- [x] computed-properties
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- [x] destructuring
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- [x] duplicate-keys
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- [x] for-of
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- [x] function-name
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- [x] instanceof
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- [x] literals
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- [x] new-target
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- [ ] object-super
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- [x] parameters
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- [x] shorthand-properties
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- [x] spread
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- [x] sticky regex (`y` flag)
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- [x] template-literals
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- [ ] invalid escape sequences inside tagged template literals. (aka es2018)
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- [x] typeof-symbol
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- [ ] unicode-regex
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- es2016
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- [x] exponentiation-operator
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- es2017
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- [x] async-to-generator
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- es2018
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- [ ] async-generator-functions
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- [ ] dotall-regex
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- [x] object-rest-spread
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- [ ] Using symbol as a key
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- [x] optional-catch-binding
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- [ ] unicode-property-regex
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- react
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- [x] jsx
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# Performance
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The lower bound of the speedup compared to babel is **16**. The benchmarks were run on Macbook pro, dual core, 2.3GHz Intel Core i5, 16 GB ram
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| | performance |
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| ------------------------ |:--------------------------------------:|
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| swc (es3) | 610 ops/sec ±1.76% (82 runs sampled) |
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| swc (es2015) | 682 ops/sec ±0.63% (88 runs sampled) |
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| swc (es2016) | 1,659 ops/sec ±4.32% (79 runs sampled) |
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| swc (es2017) | 1,384 ops/sec ±7.24% (82 runs sampled) |
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| swc (es2018) | 1,765 ops/sec ±11.78% (82 runs sampled)|
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| swc-optimize (es3) | 535 ops/sec ±1.01% (83 runs sampled) |
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| babel | 42.12 ops/sec ±6.27% (55 runs sampled) |
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| | performance |
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| ------------------ | :-------------------------------------: |
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| swc (es3) | 610 ops/sec ±1.76% (82 runs sampled) |
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| swc (es2015) | 682 ops/sec ±0.63% (88 runs sampled) |
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| swc (es2016) | 1,659 ops/sec ±4.32% (79 runs sampled) |
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| swc (es2017) | 1,384 ops/sec ±7.24% (82 runs sampled) |
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| swc (es2018) | 1,765 ops/sec ±11.78% (82 runs sampled) |
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| swc-optimize (es3) | 535 ops/sec ±1.01% (83 runs sampled) |
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| babel | 42.12 ops/sec ±6.27% (55 runs sampled) |
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## Contributing
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@ -159,8 +162,6 @@ and the Apache License (Version 2.0).
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See LICENSE-APACHE and LICENSE-MIT for details.
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[babel]:https://github.com/babel/babel
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[closure compiler]:https://github.com/google/closure-compiler
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[rust]:https://www.rust-lang.org
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[babel]: https://github.com/babel/babel
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[closure compiler]: https://github.com/google/closure-compiler
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[rust]: https://www.rust-lang.org
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@ -1347,4 +1347,20 @@ export default function waitUntil(callback, options = {}) {
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);
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}
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#[test]
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fn issue_411() {
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test_parser(
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"try {
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} catch {}",
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Syntax::Es(EsConfig {
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..Default::default()
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}),
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|p| {
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p.parse_module().map_err(|mut e| {
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e.emit();
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()
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})
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},
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);
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}
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}
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@ -1,9 +1,12 @@
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pub use self::object_rest_spread::object_rest_spread;
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pub use self::{
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object_rest_spread::object_rest_spread, optional_catch_binding::optional_catch_binding,
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};
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use crate::pass::Pass;
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use ast::Module;
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mod object_rest_spread;
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mod optional_catch_binding;
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pub fn es2018() -> impl Pass {
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object_rest_spread()
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chain_at!(Module, object_rest_spread(), optional_catch_binding())
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}
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@ -0,0 +1,35 @@
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use crate::pass::Pass;
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use ast::*;
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use swc_common::Fold;
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struct OptionalCatchBinding;
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pub fn optional_catch_binding() -> impl Pass {
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OptionalCatchBinding
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}
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impl Fold<CatchClause> for OptionalCatchBinding {
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fn fold(&mut self, cc: CatchClause) -> CatchClause {
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if cc.param.is_some() {
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return cc;
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}
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CatchClause {
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param: Some(private_ident!("e").into()),
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..cc
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use super::optional_catch_binding as tr;
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test!(
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::swc_ecma_parser::Syntax::default(),
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issue_411,
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"try {} catch {}",
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"try {} catch(e) {}"
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);
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}
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