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kuy/union.js

Last active January 9, 2017 10:30
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union.js
/* @flow */
type FN = (x: string) => number;
type FS = (x: number) => string;
type F = FN | FS; // Union types
declare var toS: FS;
declare var toN: FN;
declare var toF: F;
toF(1); // Error!
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