src/vs/platform/tunnel/node/sharedProcessTunnelService.ts/TunnelData/getAddress
class TunnelData:	async getAddress(): Promise<IAddress> {
		if (this._address) {
			// address is resolved
			return this._address;
		}
		if (!this._addressPromise) {
			this._addressPromise = new DeferredPromise<IAddress>();
		}
		return this._addressPromise.p;
	}