init

2025-02-23 23:35:15 -05:00
commit 5b64ef9207
1796 changed files with 186622 additions and 0 deletions
@@ -0,0 +1,50 @@
+'use strict';
+
+var $TypeError = require('es-errors/type');
+
+var AdvanceStringIndex = require('es-abstract/2024/AdvanceStringIndex');
+var Call = require('es-abstract/2024/Call');
+var GetIteratorDirect = require('./GetIteratorDirect');
+var GetMethod = require('es-abstract/2024/GetMethod');
+var IsArray = require('es-abstract/2024/IsArray');
+var Type = require('es-abstract/2024/Type');
+
+var getIteratorMethod = require('es-abstract/helpers/getIteratorMethod');
+
+// https://tc39.es/proposal-iterator-helpers/#sec-getiteratorflattenable
+
+module.exports = function GetIteratorFlattenable(obj, stringHandling) {
+	if (stringHandling !== 'REJECT-STRINGS' && stringHandling !== 'ITERATE-STRINGS') {
+		throw new $TypeError('Assertion failed: `stringHandling` must be "REJECT-STRINGS" or "ITERATE-STRINGS"');
+	}
+
+	if (Type(obj) !== 'Object') {
+		if (stringHandling === 'REJECT-STRINGS' || typeof obj !== 'string') {
+			throw new $TypeError('obj must be an Object'); // step 1.a
+		}
+	}
+
+	var method = void undefined; // step 2
+
+	// method = GetMethod(obj, Symbol.iterator); // step 5.a
+	method = getIteratorMethod(
+		{
+			AdvanceStringIndex: AdvanceStringIndex,
+			GetMethod: GetMethod,
+			IsArray: IsArray
+		},
+		obj
+	);
+
+	var iterator;
+	if (typeof method === 'undefined') { // step 3
+		iterator = obj; // step 3.a
+	} else { // step 4
+		iterator = Call(method, obj); // step 4.a
+	}
+
+	if (Type(iterator) !== 'Object') {
+		throw new $TypeError('iterator must be an Object'); // step 5
+	}
+	return GetIteratorDirect(iterator); // step 6
+};