1 files changed, 58 insertions, 0 deletions
diff --git a/node_modules/es-abstract/2019/FlattenIntoArray.js b/node_modules/es-abstract/2019/FlattenIntoArray.js
new file mode 100644
index 000000000..313a6ed9b
--- /dev/null
+++ b/node_modules/es-abstract/2019/FlattenIntoArray.js
@@ -0,0 +1,58 @@
+'use strict';
+
+var GetIntrinsic = require('../GetIntrinsic');
+
+var $TypeError = GetIntrinsic('%TypeError%');
+
+var MAX_SAFE_INTEGER = require('../helpers/maxSafeInteger');
+
+var Call = require('./Call');
+var CreateDataPropertyOrThrow = require('./CreateDataPropertyOrThrow');
+var Get = require('./Get');
+var HasProperty = require('./HasProperty');
+var IsArray = require('./IsArray');
+var ToLength = require('./ToLength');
+var ToString = require('./ToString');
+
+// https://ecma-international.org/ecma-262/10.0/#sec-flattenintoarray
+
+// eslint-disable-next-line max-params, max-statements
+module.exports = function FlattenIntoArray(target, source, sourceLen, start, depth) {
+	var mapperFunction;
+	if (arguments.length > 5) {
+		mapperFunction = arguments[5];
+	}
+
+	var targetIndex = start;
+	var sourceIndex = 0;
+	while (sourceIndex < sourceLen) {
+		var P = ToString(sourceIndex);
+		var exists = HasProperty(source, P);
+		if (exists === true) {
+			var element = Get(source, P);
+			if (typeof mapperFunction !== 'undefined') {
+				if (arguments.length <= 6) {
+					throw new $TypeError('Assertion failed: thisArg is required when mapperFunction is provided');
+				}
+				element = Call(mapperFunction, arguments[6], [element, sourceIndex, source]);
+			}
+			var shouldFlatten = false;
+			if (depth > 0) {
+				shouldFlatten = IsArray(element);
+			}
+			if (shouldFlatten) {
+				var elementLen = ToLength(Get(element, 'length'));
+				targetIndex = FlattenIntoArray(target, element, elementLen, targetIndex, depth - 1);
+			} else {
+				if (targetIndex >= MAX_SAFE_INTEGER) {
+					throw new $TypeError('index too large');
+				}
+				CreateDataPropertyOrThrow(target, ToString(targetIndex), element);
+				targetIndex += 1;
+			}
+		}
+		sourceIndex += 1;
+	}
+
+	return targetIndex;
+};