368db997ed
* ESNext+[[Define]]: reference to param props illegal
When target: "esnext" and useDefineForClassFields: true, property
declaration initialisers should not be able to reference parameter
properties; class fields are initialised before the constructor runs,
but parameter properties are not:
```ts
class C {
foo = this.bar
constructor(public bar: string) { }
}
```
emits code that looks like this:
```js
class C {
bar
foo = this.bar
constructor(bar) {
this.bar = bar
}
}
new C('x').foo.length // crashes; foo is undefined
```
This PR adds an error on foo's declaration with ESNext+[[Define]].
* improve test
18 lines
379 B
TypeScript
18 lines
379 B
TypeScript
// @useDefineForClassFields: true
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// @target: esnext
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class C {
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qux = this.bar // should error
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bar = this.foo // should error
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quiz = this.bar // ok
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m1() {
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this.foo // ok
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}
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constructor(private foo: string) {}
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quim = this.baz // should error
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baz = this.foo; // should error
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quid = this.baz // ok
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m2() {
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this.foo // ok
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}
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}
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