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Can't bind the apply function #5681

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#7879
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Can't bind the apply function#5681
#7879
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@marcusdarmstrong
marcusdarmstrong
opened on Jan 18, 2018

Hi there! I've been trying to get rid of a $FlowFixMe in our codebase and have isolated it down to this:

https://flow.org/try/#0PTAEAEDMBsHsHcBQiCmAPADrATgF1ACYqQCGArtPgBSQBcoAYmQHYDGuAlrMwJSgC8APlCQAdCQwZoAT1EAjDswI0eAbkRA

That is,

// @flow

export default (f: Function) => f.apply.bind(f);

yields

3: export default (f: Function) => f.apply.bind(f);
                                   ^ call of method `bind`. Callable signature not found in
3: export default (f: Function) => f.apply.bind(f);
                                   ^ function type

Even though...

const foo = () => console.log('Works');
const bar = f => f.apply.bind(f);
bar(foo)(); // Works

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