Add class properties transform.
Implementation is incomplete. Notable missing parts:
* Scopes are not updated where property initializers move from class body into class constructor / `_super` function.
* Does not handle binding shadowing problems when property initializers move from class body into class constructor.
* `this` and references to class name in static property initializers need to be transformed to point to a temp var.
* Not all usages of private properties are supported (see below).
* Code which is moved to outside of class body is not transformed by other transforms for class declarations (works OK for class expressions). This includes static property initializers, static blocks, and computed property/method keys.
* Only basic checks for whether computed property/method keys may have side effects.
* Numerous other small issues noted in TODO comments through the code.
### Private properties
Currently does not handle the following usages of private properties:
```js
class Class {
#prop;
static #static;
method() {
object?.#prop;
object?.#prop();
[object.#prop] = [1];
({x: object.#prop} = {x: 1});
object.#prop`xyz`;
object?.#static;
object?.#static();
[object.#static] = [1];
({x: object.#static} = {x: 1});
object.#static`xyz`;
}
}
```
Add `--debug` command line option for transformer conformance runner, same as for `cargo coverage`. It prints the paths of test fixtures before running them.
Passed 15/19 tests. The remaining 4 failed tests related to `this` expression, the problem same as I mentioned in #6658. I will fix them in follow-up PRs.
Move post-transform checker into a `tasks` crate. It doesn't feel like it belongs in `oxc_semantic`. It also feels like too heavy a lump of code to put in `tasks/common`.
Rename transform conformance RegExp test fixtures folder from "esbuild-tests" to "regexp", to reflect that not all these tests are copied from ESBuild.
related: #4754
The implementation port from [esbuild](332727499e/internal/js_parser/js_parser.go (L12820-L12840)). And cover all babel's regexp plugins
---
## The following description was generated by `Graphite` 😋
### TL;DR
Added support for transforming various RegExp features to ensure compatibility with older JavaScript environments.
### What changed?
- Implemented a new `RegExp` transformer to handle unsupported RegExp literal features
- Added options to control different RegExp transformations (e.g., sticky flag, unicode flag, dot-all flag, etc.)
- Updated the transformer to convert unsupported RegExp literals into `new RegExp()` constructor calls
- Added test cases for different RegExp transformations
- Integrated the new RegExp transformer into the existing transformation pipeline
### How to test?
1. Run the existing test suite to ensure no regressions
2. Execute the new RegExp-specific tests in the `tasks/transform_conformance/tests/esbuild-tests/test/fixtures/regexp/` directory
3. Try transforming code with various RegExp features using different target environments to verify correct transformations
Include "Output mismatch" in transform conformance snapshots when a test also fails due to scopes/symbols mismatches.
At present, many of the tests are failing on scopes/symbols mismatches, so it's hard to see from snapshots which also have an output mismatch. In particular, when working to fix scope mismatches, it's hard to notice if changes you make cause the output to be wrong. These extra messages make that visible.
Snapshots generated by transform conformance were missing a few errors (e.g. `declarations/const-enum/input.ts` at bottom of diff). Make sure all errors fail the test.
Pure refactor of transform checker. Store all scope data in `PostTransformChecker` so it doesn't need to be passed around. `SemanticData` contains a full set of all semantic data for semantic pass, so we have 2 instances of it for 1. after transform and 2. rebuilt semantic.
