src/vs/platform/terminal/common/capabilities/terminalCapabilityStore.ts/TerminalCapabilityStore/add
class TerminalCapabilityStore:	add<T extends TerminalCapability>(capability: T, impl: ITerminalCapabilityImplMap[T]) {
		this._map.set(capability, impl);
		this._onDidAddCapability.fire(capability);
	}