Change `Atom<'a>::as_str(&self) -> &str` to `Atom<'a>::as_str(&self) ->
&'a str`.
This API is more ergonomic for external `oxc` consumers relying on
`&str` data collected while traversing an AST.
I also enhanced some nearby doc comments and implemented some
`From<...>` traits while I was at it.
part of #3213
We should only have one diagnostic struct instead 353 copies of them, so we don't end up choking LLVM with 50k lines of the same code due to monomorphization.
If the proposed approach is good, then I'll start writing a codemod to turn all the existing structs to plain functions.
---
Background:
Using `--timings`, we see `oxc_linter` is slow on codegen (the purple part).

The crate currently contains 353 miette errors. [cargo-llvm-lines](https://github.com/dtolnay/cargo-llvm-lines) displays
```
cargo llvm-lines -p oxc_linter --lib --release
Lines Copies Function name
----- ------ -------------
830350 33438 (TOTAL)
29252 (3.5%, 3.5%) 808 (2.4%, 2.4%) <alloc::boxed::Box<T,A> as core::ops::drop::Drop>::drop
23298 (2.8%, 6.3%) 353 (1.1%, 3.5%) miette::eyreish::error::object_downcast
19062 (2.3%, 8.6%) 706 (2.1%, 5.6%) core::error::Error::type_id
12610 (1.5%, 10.1%) 65 (0.2%, 5.8%) alloc::raw_vec::RawVec<T,A>::grow_amortized
12002 (1.4%, 11.6%) 706 (2.1%, 7.9%) miette::eyreish::ptr::Own<T>::boxed
9215 (1.1%, 12.7%) 115 (0.3%, 8.2%) core::iter::traits::iterator::Iterator::try_fold
9150 (1.1%, 13.8%) 1 (0.0%, 8.2%) oxc_linter::rules::RuleEnum::read_json
8825 (1.1%, 14.9%) 353 (1.1%, 9.3%) <miette::eyreish::error::ErrorImpl<E> as core::error::Error>::source
8822 (1.1%, 15.9%) 353 (1.1%, 10.3%) miette::eyreish::error::<impl miette::eyreish::Report>::construct
8119 (1.0%, 16.9%) 353 (1.1%, 11.4%) miette::eyreish::error::object_ref
8119 (1.0%, 17.9%) 353 (1.1%, 12.5%) miette::eyreish::error::object_ref_stderr
7413 (0.9%, 18.8%) 353 (1.1%, 13.5%) <miette::eyreish::error::ErrorImpl<E> as core::fmt::Display>::fmt
7413 (0.9%, 19.7%) 353 (1.1%, 14.6%) miette::eyreish::ptr::Own<T>::new
6669 (0.8%, 20.5%) 39 (0.1%, 14.7%) alloc::raw_vec::RawVec<T,A>::try_allocate_in
6173 (0.7%, 21.2%) 353 (1.1%, 15.7%) miette::eyreish::error::<impl miette::eyreish::Report>::from_std
6027 (0.7%, 21.9%) 70 (0.2%, 16.0%) <alloc::vec::Vec<T> as alloc::vec::spec_from_iter_nested::SpecFromIterNested<T,I>>::from_iter
6001 (0.7%, 22.7%) 353 (1.1%, 17.0%) miette::eyreish::error::object_drop
6001 (0.7%, 23.4%) 353 (1.1%, 18.1%) miette::eyreish::error::object_drop_front
5648 (0.7%, 24.1%) 353 (1.1%, 19.1%) <miette::eyreish::error::ErrorImpl<E> as core::fmt::Debug>::fmt
```
It's totalling more than 50k llvm lines, and is putting pressure on rustc codegen (the purple part on `oxc_linter` in the image above.
---
It's pretty obvious by looking at https://github.com/zkat/miette/blob/main/src/eyreish/error.rs, the generics can expand out to lots of code.
This PR merges the previous confusing features `serde` and `wasm` into a
single `serialize` feature.
We'll eventually do serialize + type information for both wasm and napi
targets.
`oxc_macros` is removed from `oxc_ast`'s dependency because it requires
`syn` and friends, which goes against our policy ["Third-party
dependencies should be
minimal."](https://oxc-project.github.io/docs/contribute/rules.html#development-policy)
Closes#2677.
Also changed the JSON output to be `javascript`, `typescript` or
`typescriptDefinition`. The current value `javaScript` / `typeScript` is
a bit weird.
Closes#2641.
Also added `tsify` attribute to the `SerAttrs` derive macro, so `#[cfg_attr(feature = "wasm", tsify(...))]` can also be reduced to `#[tsify(...)]`.
Pure refactor. Import `tsify::Tsify` in files that use it, so then shorten a load of:
```diff
- #[cfg_attr(feature = "wasm", derive(tsify::Tsify))]
+ #[cfg_attr(feature = "wasm", derive(Tsify))]
```
First step towards #2516.
This replaces `compact_str::CompactString` with an immutable interface `CompactStr`.
Currently just implemented as a wrapper around `CompactString` which hides all its mutation methods. A more optimized implementation to follow, which shrinks size of `CompactStr` to 16 bytes by removing the `capacity` field.
The rationale for the change of name is: `CompactString` is like `String` in that it's mutable. `CompactStr` is more like `str` - immutable - so its name mirrors `str`.
Preparatory step for #2620.
This PR purely changes names of types and methods:
* `CompactString` -> `CompactStr`
* `Atom::to_compact_string` -> `to_compact_str`
* `Atom::into_compact_string` -> `into_compact_str`
Have split this into a separate PR as the diff is large, but it does absolutely nothing but renaming (I've checked the whole diff twice, so feel free not to check it again!). This should make it easier to see the content of the substantive change in #2620.
closes#1803
This string is currently unsafe, but I want to get miri working before
introducing more changes.
I want to make a progress from memory leak to unsafe then to safety.
It's harder to do the steps in one go.
Add test cases to `oxc_semantic` that check scope flag behavior.
Also contains these tweaks:
- fix: allow disabling `with_module` on `SourceType`
- refactor: move `SymbolTester` to a separate file
- chore: add `Expect` trait & implement it on `SymbolTester`
Fold constant addition expressions. Handles string concatenation and
addition, both with implicit casting.
For example,
```ts
let x = 1 + 1
let y = "hello " + "world"
```
now becomes
```ts
let x = 2
let y = "hello world"
```
## Extra Goodies
- test(minifier): add `test_snapshot` helper to perform snapshot tests
with `insta`
- up(hir): implement `std::ops::Add` for `NumericValue`
- up(span): impl `TryFrom<Cow<'_, &str>>` for `Atom`
Fixes 11 TS conformance tests and 18 babel tests.
Adds types to the symbol table functionally conformant to TS behavior
but symbol flags implemented slightly differently.
Symbol redeclaration check is also not entirely conformant but fixing
this seems like a separate PR.
For testing purposes - consistent-export-type was also implemented
(WIP).