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node_modules/es-abstract/2021/StringIndexOf.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 Type = require('./Type');
+
+var $slice = callBound('String.prototype.slice');
+
+// https://ecma-international.org/ecma-262/12.0/#sec-stringindexof
+
+module.exports = function StringIndexOf(string, searchValue, fromIndex) {
+	if (Type(string) !== 'String') {
+		throw new $TypeError('Assertion failed: `string` must be a String');
+	}
+	if (Type(searchValue) !== 'String') {
+		throw new $TypeError('Assertion failed: `searchValue` must be a String');
+	}
+	if (!IsIntegralNumber(fromIndex) || fromIndex < 0) {
+		throw new $TypeError('Assertion failed: `fromIndex` must be a non-negative integer');
+	}
+
+	var len = string.length;
+	if (searchValue === '' && fromIndex <= len) {
+		return fromIndex;
+	}
+
+	var searchLen = searchValue.length;
+	for (var i = fromIndex; i <= (len - searchLen); i += 1) {
+		var candidate = $slice(string, i, i + searchLen);
+		if (candidate === searchValue) {
+			return i;
+		}
+	}
+	return -1;
+};