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don't throw classNameTDZError if referenced identifier is within a Ty…
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…peAnnotation (#9190)

fix #9189

Obviously this code is intended to throw an error if someone tries to reference a class before it's defined, like:
```js
class Foo {
  someField = Foo;
}
```
But there's no problem with referencing the class in a type annotation before it's defined, and this is often necessary for tree structures:
```js
class Foo {
  [someSymbol]: Foo;
}
```
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jedwards1211 authored and nicolo-ribaudo committed Dec 15, 2018
1 parent c1499b1 commit 3c8e15d
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Original file line number Diff line number Diff line change
@@ -0,0 +1,7 @@
const sym = Symbol();
const sym1 = Symbol();

class A {
[sym]: A.B;
[sym1]: Array<A>;
}
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@@ -0,0 +1,8 @@
{
"presets": [
"flow"
],
"plugins": [
"proposal-class-properties"
]
}
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@@ -0,0 +1,13 @@
function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }

const sym = Symbol();
const sym1 = Symbol();

class A {
constructor() {
_defineProperty(this, sym, void 0);

_defineProperty(this, sym1, void 0);
}

}
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@@ -0,0 +1,5 @@
const sym = Symbol();

class A {
[sym]: A;
}
Original file line number Diff line number Diff line change
@@ -0,0 +1,8 @@
{
"presets": [
"flow"
],
"plugins": [
"proposal-class-properties"
]
}
Original file line number Diff line number Diff line change
@@ -0,0 +1,10 @@
function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }

const sym = Symbol();

class A {
constructor() {
_defineProperty(this, sym, void 0);
}

}
3 changes: 3 additions & 0 deletions packages/babel-helper-replace-supers/src/index.js
Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,9 @@ function skipAllButComputedKey(path) {
}

export const environmentVisitor = {
TypeAnnotation(path) {
path.skip();
},
Function(path) {
// Methods will be handled by the Method visit
if (path.isMethod()) return;
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