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node_modules/es-abstract/2022/IsLessThan.js

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+'use strict';
+
+var GetIntrinsic = require('get-intrinsic');
+
+var $Number = GetIntrinsic('%Number%');
+var $TypeError = require('es-errors/type');
+
+var $isNaN = require('math-intrinsics/isNaN');
+
+var IsStringPrefix = require('./IsStringPrefix');
+var StringToBigInt = require('./StringToBigInt');
+var ToNumeric = require('./ToNumeric');
+var ToPrimitive = require('./ToPrimitive');
+
+var BigIntLessThan = require('./BigInt/lessThan');
+var NumberLessThan = require('./Number/lessThan');
+
+// https://262.ecma-international.org/13.0/#sec-islessthan
+
+// eslint-disable-next-line max-statements, max-lines-per-function
+module.exports = function IsLessThan(x, y, LeftFirst) {
+	if (typeof 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, $Number);
+	}
+
+	if (typeof px === 'string' && typeof py === 'string') {
+		if (IsStringPrefix(py, px)) {
+			return false;
+		}
+		if (IsStringPrefix(px, py)) {
+			return true;
+		}
+		/*
+		c. Let k be the smallest non-negative integer such that the code unit at index k within px is different from the code unit at index k within py. (There must be such a k, for neither String is a prefix of the other.)
+		d. Let m be the integer that is the numeric value of the code unit at index k within px.
+		e. Let n be the integer that is the numeric value of the code unit at index k within py.
+		f. If m < n, return true. Otherwise, return false.
+		*/
+		return px < py; // both strings, neither a prefix of the other. shortcut for steps 3 c-f
+	}
+
+	var nx;
+	var ny;
+	if (typeof px === 'bigint' && typeof py === 'string') {
+		ny = StringToBigInt(py);
+		if (typeof ny === 'undefined') {
+			return void undefined;
+		}
+		return BigIntLessThan(px, ny);
+	}
+	if (typeof px === 'string' && typeof py === 'bigint') {
+		nx = StringToBigInt(px);
+		if (typeof nx === 'undefined') {
+			return void undefined;
+		}
+		return BigIntLessThan(nx, py);
+	}
+
+	nx = ToNumeric(px);
+	ny = ToNumeric(py);
+
+	if (typeof nx === typeof ny) {
+		return typeof nx === 'number' ? NumberLessThan(nx, ny) : BigIntLessThan(nx, ny);
+	}
+
+	if ($isNaN(nx) || $isNaN(ny)) {
+		return void undefined;
+	}
+
+	if (nx === -Infinity || ny === Infinity) {
+		return true;
+	}
+	if (nx === Infinity || ny === -Infinity) {
+		return false;
+	}
+
+	return nx < ny; // by now, these are both finite, and the same type
+};