create project

kitabcitab/node_modules/es-abstract/2022/GetStringIndex.js

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+'use strict';
+
+var GetIntrinsic = require('get-intrinsic');
+var callBound = require('call-bind/callBound');
+
+var $TypeError = GetIntrinsic('%TypeError%');
+
+var IsIntegralNumber = require('./IsIntegralNumber');
+var StringToCodePoints = require('./StringToCodePoints');
+var Type = require('./Type');
+
+var $indexOf = callBound('String.prototype.indexOf');
+
+// https://ecma-international.org/ecma-262/13.0/#sec-getstringindex
+
+module.exports = function GetStringIndex(S, e) {
+	if (Type(S) !== 'String') {
+		throw new $TypeError('Assertion failed: `S` must be a String');
+	}
+	if (!IsIntegralNumber(e) || e < 0) {
+		throw new $TypeError('Assertion failed: `e` must be a non-negative integer');
+	}
+
+	if (S === '') {
+		return 0;
+	}
+	var codepoints = StringToCodePoints(S);
+	var eUTF = e >= codepoints.length ? S.length : $indexOf(S, codepoints[e]);
+	return eUTF;
+};