Commit

1 files changed, 26 insertions, 0 deletions

diff --git a/src/node_modules/es-abstract/2017/ToIndex.js b/src/node_modules/es-abstract/2017/ToIndex.js
new file mode 100644
index 0000000..a55398d
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+++ b/src/node_modules/es-abstract/2017/ToIndex.js
@@ -0,0 +1,26 @@
+'use strict';
+
+var GetIntrinsic = require('../GetIntrinsic');
+
+var $RangeError = GetIntrinsic('%RangeError%');
+
+var ToInteger = require('./ToInteger');
+var ToLength = require('./ToLength');
+var SameValueZero = require('./SameValueZero');
+
+// https://www.ecma-international.org/ecma-262/8.0/#sec-toindex
+
+module.exports = function ToIndex(value) {
+	if (typeof value === 'undefined') {
+		return 0;
+	}
+	var integerIndex = ToInteger(value);
+	if (integerIndex < 0) {
+		throw new $RangeError('index must be >= 0');
+	}
+	var index = ToLength(integerIndex);
+	if (!SameValueZero(integerIndex, index)) {
+		throw new $RangeError('index must be >= 0 and < 2 ** 53 - 1');
+	}
+	return index;
+};