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Can't get correct instance type when extending from Error and target es5. #17398
Description
TypeScript Version: 2.4.2
Code
class MyError extends Error {
constructor(msg: any) {
super(msg);
}
}
let err = new MyError('msg');
console.log(err instanceof MyError);Expected behavior:
true
Actual behavior:
err instanceof MyError return false, and err is an instance of Error.
Activity
[-]Can't get correct instance type when extending from Error.[/-][+]Can't get correct instance type when extending from Error when target es5.[/+][-]Can't get correct instance type when extending from Error when target es5.[/-][+]Can't get correct instance type when extending from Error and target es5.[/+]j-oliveras commentedon Jul 25, 2017
This is a breaking change since Typescript 2.1.
DanielRosenwasser commentedon Jul 26, 2017
Duplicate of #12123.