File: bestChoiceType.ts

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node-typescript 2.1.5-1~bpo8%2B1
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// @strictNullChecks: true

// Repro from #10041

(''.match(/ /) || []).map(s => s.toLowerCase());

// Similar cases

function f1() {
    let x = ''.match(/ /);
    let y = x || [];
    let z = y.map(s => s.toLowerCase());
}

function f2() {
    let x = ''.match(/ /);
    let y = x ? x : [];
    let z = y.map(s => s.toLowerCase());
}