TypeScript 2.9 incorrect generator this value in ES5 #24564
Description
TypeScript Version: Version 3.0.0-dev.20180601 and also Version 2.9.1
Search Terms: ES5 generator this value
Code
class Test {
async getChildren() {
const randomItems = await this.someRandomMethod();
const processedItems = randomItems.map((item) => {
return this.doSomeProcessing(item); // <-- this will have incorrect _this value!
});
return ([] as string[]).concat(...processedItems); // <-- if I don't cast here, the above _this is good
}
private doSomeProcessing(stuff: string) {
return stuff;
}
private async someRandomMethod() {
return ["a", "b", "c"];
}
}Expected behavior:
this.doSomeProcessing(item) points to a correct this value
Actual behavior:
The emitted code has var _this = this but in the wrong scope