src/vs/workbench/contrib/debug/common/abstractDebugAdapter.ts/AbstractDebugAdapter/onRequest
class AbstractDebugAdapter:	onRequest(callback: (request: DebugProtocol.Request) => void): void {
		if (this.requestCallback) {
			this._onError.fire(new Error(`attempt to set more than one 'Request' callback`));
		}
		this.requestCallback = callback;
	}