/usr/lib/nodejs/es5-ext/optional-chaining.js is in node-es5-ext 0.10.30-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | "use strict";
var isValue = require("./object/is-value");
var slice = Array.prototype.slice;
// eslint-disable-next-line no-unused-vars
module.exports = function (value, propertyName1 /*, …propertyNamen*/) {
var propertyNames = slice.call(arguments, 1), index = 0, length = propertyNames.length;
while (isValue(value) && index < length) value = value[propertyNames[index++]];
return index === length ? value : undefined;
};
|