bdde081050
Added test to ensure that release notes are parsed properly Updated to latest dependencies to fix security vulnerability Updated GH Actions Workflow to run test before updating tag Updated README.md to reflect proper whatsnew documentation.
52 lines
1.3 KiB
JavaScript
52 lines
1.3 KiB
JavaScript
'use strict';
|
|
|
|
var implementation = require('./implementation');
|
|
|
|
var lacksProperEnumerationOrder = function () {
|
|
if (!Object.assign) {
|
|
return false;
|
|
}
|
|
// v8, specifically in node 4.x, has a bug with incorrect property enumeration order
|
|
// note: this does not detect the bug unless there's 20 characters
|
|
var str = 'abcdefghijklmnopqrst';
|
|
var letters = str.split('');
|
|
var map = {};
|
|
for (var i = 0; i < letters.length; ++i) {
|
|
map[letters[i]] = letters[i];
|
|
}
|
|
var obj = Object.assign({}, map);
|
|
var actual = '';
|
|
for (var k in obj) {
|
|
actual += k;
|
|
}
|
|
return str !== actual;
|
|
};
|
|
|
|
var assignHasPendingExceptions = function () {
|
|
if (!Object.assign || !Object.preventExtensions) {
|
|
return false;
|
|
}
|
|
// Firefox 37 still has "pending exception" logic in its Object.assign implementation,
|
|
// which is 72% slower than our shim, and Firefox 40's native implementation.
|
|
var thrower = Object.preventExtensions({ 1: 2 });
|
|
try {
|
|
Object.assign(thrower, 'xy');
|
|
} catch (e) {
|
|
return thrower[1] === 'y';
|
|
}
|
|
return false;
|
|
};
|
|
|
|
module.exports = function getPolyfill() {
|
|
if (!Object.assign) {
|
|
return implementation;
|
|
}
|
|
if (lacksProperEnumerationOrder()) {
|
|
return implementation;
|
|
}
|
|
if (assignHasPendingExceptions()) {
|
|
return implementation;
|
|
}
|
|
return Object.assign;
|
|
};
|