src/vs/platform/terminal/node/ptyHostService.ts/PtyHostService/_resolveVariables
class PtyHostService:	private _resolveVariables(text: string[]): Promise<string[]> {
		return new Promise<string[]>(resolve => {
			const id = ++lastResolveVariablesRequestId;
			this._pendingResolveVariablesRequests.set(id, resolve);
			this._onPtyHostRequestResolveVariables.fire({ id, originalText: text });
		});
	}