File: typePredicatesInUnion.ts

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node-typescript 4.1.3-1
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interface A {
    pred(x: {}): x is boolean;
}
interface B {
    pred(x: {}): x is string;
}

type Or = A | B;

function f(o: Or, x: {}) {
    if (o.pred(x)) {
        x;
    }
}