1 files changed, 66 insertions, 0 deletions
diff --git a/node_modules/es-abstract/2016/AbstractRelationalComparison.js b/node_modules/es-abstract/2016/AbstractRelationalComparison.js
new file mode 100644
index 000000000..bc7ca8324
--- /dev/null
+++ b/node_modules/es-abstract/2016/AbstractRelationalComparison.js
@@ -0,0 +1,66 @@
+'use strict';
+
+var GetIntrinsic = require('../GetIntrinsic');
+
+var $Number = GetIntrinsic('%Number%');
+var $TypeError = GetIntrinsic('%TypeError%');
+
+var $isNaN = require('../helpers/isNaN');
+var $isFinite = require('../helpers/isFinite');
+var isPrefixOf = require('../helpers/isPrefixOf');
+
+var ToNumber = require('./ToNumber');
+var ToPrimitive = require('./ToPrimitive');
+var Type = require('./Type');
+
+// https://www.ecma-international.org/ecma-262/5.1/#sec-11.8.5
+
+// eslint-disable-next-line max-statements
+module.exports = function AbstractRelationalComparison(x, y, LeftFirst) {
+	if (Type(LeftFirst) !== 'Boolean') {
+		throw new $TypeError('Assertion failed: LeftFirst argument must be a Boolean');
+	}
+	var px;
+	var py;
+	if (LeftFirst) {
+		px = ToPrimitive(x, $Number);
+		py = ToPrimitive(y, $Number);
+	} else {
+		py = ToPrimitive(y, $Number);
+		px = ToPrimitive(x, $Number);
+	}
+	var bothStrings = Type(px) === 'String' && Type(py) === 'String';
+	if (!bothStrings) {
+		var nx = ToNumber(px);
+		var ny = ToNumber(py);
+		if ($isNaN(nx) || $isNaN(ny)) {
+			return undefined;
+		}
+		if ($isFinite(nx) && $isFinite(ny) && nx === ny) {
+			return false;
+		}
+		if (nx === 0 && ny === 0) {
+			return false;
+		}
+		if (nx === Infinity) {
+			return false;
+		}
+		if (ny === Infinity) {
+			return true;
+		}
+		if (ny === -Infinity) {
+			return false;
+		}
+		if (nx === -Infinity) {
+			return true;
+		}
+		return nx < ny; // by now, these are both nonzero, finite, and not equal
+	}
+	if (isPrefixOf(py, px)) {
+		return false;
+	}
+	if (isPrefixOf(px, py)) {
+		return true;
+	}
+	return px < py; // both strings, neither a prefix of the other. shortcut for steps c-f
+};