src/vs/workbench/services/output/common/output.ts/OutputChannelRegistry/registerChannel
class OutputChannelRegistry:	public registerChannel(descriptor: IOutputChannelDescriptor): void {
		if (!this.channels.has(descriptor.id)) {
			this.channels.set(descriptor.id, descriptor);
			this._onDidRegisterChannel.fire(descriptor.id);
		}
	}