File: strictTypeofUnionNarrowing.js

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node-typescript 3.3.3333-1
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//// [strictTypeofUnionNarrowing.ts]
function stringify1(anything: { toString(): string } | undefined): string {
    return typeof anything === "string" ? anything.toUpperCase() : "";
}

function stringify2(anything: {} | undefined): string {
    return typeof anything === "string" ? anything.toUpperCase() : "";
}

function stringify3(anything: unknown | undefined): string { // should simplify to just `unknown` which should narrow fine
    return typeof anything === "string" ? anything.toUpperCase() : "";
}

function stringify4(anything: { toString?(): string } | undefined): string {
    return typeof anything === "string" ? anything.toUpperCase() : "";
}


//// [strictTypeofUnionNarrowing.js]
"use strict";
function stringify1(anything) {
    return typeof anything === "string" ? anything.toUpperCase() : "";
}
function stringify2(anything) {
    return typeof anything === "string" ? anything.toUpperCase() : "";
}
function stringify3(anything) {
    return typeof anything === "string" ? anything.toUpperCase() : "";
}
function stringify4(anything) {
    return typeof anything === "string" ? anything.toUpperCase() : "";
}