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Side by Side Diff: third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/immutable-prototype-serviceworker.js

Issue 2933913002: Upstream service worker prototype test to WPT
Patch Set: Migrate test for immutable prototype Created 3 years, 5 months ago
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1 function prototypeChain(global) {
2 let result = [];
3 while (global !== null) {
4 let thrown = false;
5 let next = global.__proto__;
6 try {
7 global.__proto__ = {};
8 result.push('mutable');
9 } catch (e) {
10 result.push('immutable');
11 }
12 global = next;
13 }
14 return result;
15 }
16
17 self.onmessage = function(e) {
18 e.data.postMessage(prototypeChain(self));
19 };
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