| try { |
| importScripts('empty-worker.js'); |
| if ('DedicatedWorkerGlobalScope' in self && |
| self instanceof DedicatedWorkerGlobalScope) { |
| postMessage('LOADED'); |
| } else if ( |
| 'SharedWorkerGlobalScope' in self && |
| self instanceof SharedWorkerGlobalScope) { |
| onconnect = e => { |
| e.ports[0].postMessage('LOADED'); |
| }; |
| } |
| } catch (e) { |
| // Post a message instead of propagating an ErrorEvent to the page because |
| // propagated event loses an error name. |
| // |
| // Step 1. "Let notHandled be the result of firing an event named error at the |
| // Worker object associated with the worker, using ErrorEvent, with the |
| // cancelable attribute initialized to true, the message, filename, lineno, |
| // and colno attributes initialized appropriately, and the error attribute |
| // initialized to null." |
| // https://html.spec.whatwg.org/multipage/workers.html#runtime-script-errors-2 |
| if ('DedicatedWorkerGlobalScope' in self && |
| self instanceof DedicatedWorkerGlobalScope) { |
| postMessage(e.name); |
| } else if ( |
| 'SharedWorkerGlobalScope' in self && |
| self instanceof SharedWorkerGlobalScope) { |
| onconnect = connectEvent => { |
| connectEvent.ports[0].postMessage(e.name); |
| }; |
| } |
| } |
