File: stringLiteralCheckedInIf02.js

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node-typescript 3.3.3333-1
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//// [stringLiteralCheckedInIf02.ts]
type S = "a" | "b";
type T = S[] | S;

function isS(t: T): t is S {
    return t === "a" || t === "b";
}

function f(foo: T) {
    if (isS(foo)) {
        return foo;
    }
    else { 
        return foo[0];
    }
}

//// [stringLiteralCheckedInIf02.js]
function isS(t) {
    return t === "a" || t === "b";
}
function f(foo) {
    if (isS(foo)) {
        return foo;
    }
    else {
        return foo[0];
    }
}