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node_modules/es-abstract/2015/AbstractEqualityComparison.js

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+'use strict';
+
+var ToNumber = require('./ToNumber');
+var ToPrimitive = require('./ToPrimitive');
+var Type = require('./Type');
+
+var isObject = require('../helpers/isObject');
+
+// https://262.ecma-international.org/6.0/#sec-abstract-equality-comparison
+
+module.exports = function AbstractEqualityComparison(x, y) {
+	if (Type(x) === Type(y)) {
+		return x === y; // ES6+ specified this shortcut anyways.
+	}
+	if (x == null && y == null) {
+		return true;
+	}
+	if (typeof x === 'number' && typeof y === 'string') {
+		return AbstractEqualityComparison(x, ToNumber(y));
+	}
+	if (typeof x === 'string' && typeof y === 'number') {
+		return AbstractEqualityComparison(ToNumber(x), y);
+	}
+	if (typeof x === 'boolean') {
+		return AbstractEqualityComparison(ToNumber(x), y);
+	}
+	if (typeof y === 'boolean') {
+		return AbstractEqualityComparison(x, ToNumber(y));
+	}
+	if ((typeof x === 'string' || typeof x === 'number' || typeof x === 'symbol') && isObject(y)) {
+		return AbstractEqualityComparison(x, ToPrimitive(y));
+	}
+	if (isObject(x) && (typeof y === 'string' || typeof y === 'number' || typeof y === 'symbol')) {
+		return AbstractEqualityComparison(ToPrimitive(x), y);
+	}
+	return false;
+};