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Operation of "instanceof" is illegal when "target:es5" #13123

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kgtkr opened this issue Dec 22, 2016 · 1 comment
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Operation of "instanceof" is illegal when "target:es5" #13123

kgtkr opened this issue Dec 22, 2016 · 1 comment
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@kgtkr
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kgtkr commented Dec 22, 2016

typescript2.1.4

class MyError extends Error {}
let e=new MyError();
console.log(e instanceof MyError);

target:es5

false

target:es6

true
@mhegazy
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mhegazy commented Dec 22, 2016

duplicate of #12790

Please see https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#extending-built-ins-like-error-array-and-map-may-no-longer-work

@mhegazy mhegazy closed this as completed Dec 22, 2016
@mhegazy mhegazy added the Duplicate An existing issue was already created label Dec 22, 2016
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