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node_modules/es-abstract/2020/Number/add.js

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+'use strict';
+
+var GetIntrinsic = require('get-intrinsic');
+
+var $TypeError = GetIntrinsic('%TypeError%');
+
+var isNaN = require('../../helpers/isNaN');
+
+var Type = require('../Type');
+
+// https://262.ecma-international.org/11.0/#sec-numeric-types-number-add
+
+module.exports = function NumberAdd(x, y) {
+	if (Type(x) !== 'Number' || Type(y) !== 'Number') {
+		throw new $TypeError('Assertion failed: `x` and `y` arguments must be Numbers');
+	}
+
+	if (isNaN(x) || isNaN(y) || (x === Infinity && y === -Infinity) || (x === -Infinity && y === Infinity)) {
+		return NaN;
+	}
+
+	if ((x === Infinity && y === Infinity) || (x === -Infinity && y === -Infinity)) {
+		return x;
+	}
+
+	if (x === Infinity) {
+		return x;
+	}
+
+	if (y === Infinity) {
+		return y;
+	}
+
+	if (x === y && x === 0) {
+		return Infinity / x === -Infinity && Infinity / y === -Infinity ? -0 : +0;
+	}
+
+	if (x === -y || -x === y) {
+		return +0;
+	}
+
+	// shortcut for the actual spec mechanics
+	return x + y;
+};