1 files changed, 85 insertions, 0 deletions
diff --git a/node_modules/es-abstract/2015/ArraySetLength.js b/node_modules/es-abstract/2015/ArraySetLength.js
new file mode 100644
index 000000000..c9134c6e6
--- /dev/null
+++ b/node_modules/es-abstract/2015/ArraySetLength.js
@@ -0,0 +1,85 @@
+'use strict';
+
+var GetIntrinsic = require('../GetIntrinsic');
+
+var $RangeError = GetIntrinsic('%RangeError%');
+var $TypeError = GetIntrinsic('%TypeError%');
+
+var assign = require('object.assign');
+
+var isPropertyDescriptor = require('../helpers/isPropertyDescriptor');
+
+var IsArray = require('./IsArray');
+var IsAccessorDescriptor = require('./IsAccessorDescriptor');
+var IsDataDescriptor = require('./IsDataDescriptor');
+var OrdinaryDefineOwnProperty = require('./OrdinaryDefineOwnProperty');
+var OrdinaryGetOwnProperty = require('./OrdinaryGetOwnProperty');
+var ToNumber = require('./ToNumber');
+var ToString = require('./ToString');
+var ToUint32 = require('./ToUint32');
+var Type = require('./Type');
+
+// https://www.ecma-international.org/ecma-262/6.0/#sec-arraysetlength
+
+// eslint-disable-next-line max-statements, max-lines-per-function
+module.exports = function ArraySetLength(A, Desc) {
+	if (!IsArray(A)) {
+		throw new $TypeError('Assertion failed: A must be an Array');
+	}
+	if (!isPropertyDescriptor({
+		Type: Type,
+		IsDataDescriptor: IsDataDescriptor,
+		IsAccessorDescriptor: IsAccessorDescriptor
+	}, Desc)) {
+		throw new $TypeError('Assertion failed: Desc must be a Property Descriptor');
+	}
+	if (!('[[Value]]' in Desc)) {
+		return OrdinaryDefineOwnProperty(A, 'length', Desc);
+	}
+	var newLenDesc = assign({}, Desc);
+	var newLen = ToUint32(Desc['[[Value]]']);
+	var numberLen = ToNumber(Desc['[[Value]]']);
+	if (newLen !== numberLen) {
+		throw new $RangeError('Invalid array length');
+	}
+	newLenDesc['[[Value]]'] = newLen;
+	var oldLenDesc = OrdinaryGetOwnProperty(A, 'length');
+	if (!IsDataDescriptor(oldLenDesc)) {
+		throw new $TypeError('Assertion failed: an array had a non-data descriptor on `length`');
+	}
+	var oldLen = oldLenDesc['[[Value]]'];
+	if (newLen >= oldLen) {
+		return OrdinaryDefineOwnProperty(A, 'length', newLenDesc);
+	}
+	if (!oldLenDesc['[[Writable]]']) {
+		return false;
+	}
+	var newWritable;
+	if (!('[[Writable]]' in newLenDesc) || newLenDesc['[[Writable]]']) {
+		newWritable = true;
+	} else {
+		newWritable = false;
+		newLenDesc['[[Writable]]'] = true;
+	}
+	var succeeded = OrdinaryDefineOwnProperty(A, 'length', newLenDesc);
+	if (!succeeded) {
+		return false;
+	}
+	while (newLen < oldLen) {
+		oldLen -= 1;
+		// eslint-disable-next-line no-param-reassign
+		var deleteSucceeded = delete A[ToString(oldLen)];
+		if (!deleteSucceeded) {
+			newLenDesc['[[Value]]'] = oldLen + 1;
+			if (!newWritable) {
+				newLenDesc['[[Writable]]'] = false;
+				OrdinaryDefineOwnProperty(A, 'length', newLenDesc);
+				return false;
+			}
+		}
+	}
+	if (!newWritable) {
+		return OrdinaryDefineOwnProperty(A, 'length', { '[[Writable]]': false });
+	}
+	return true;
+};