minimal-polyfills/Object.is.js

An ultra light-weight, nonexhaustive, polyfills library

"use strict";
exports.__esModule = true;
if (!Object.is) {
    Object.is = function (x, y) {
        // SameValue algorithm
        if (x === y) { // Steps 1-5, 7-10
            // Steps 6.b-6.e: +0 != -0
            return x !== 0 || 1 / x === 1 / y;
        }
        else {
            // Step 6.a: NaN == NaN
            return x !== x && y !== y;
        }
    };
}
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