src/vs/editor/contrib/parameterHints/browser/parameterHintsModel.ts/ParameterHintsModel/getLastActiveHints
class ParameterHintsModel:	private getLastActiveHints(): languages.SignatureHelp | undefined {
		switch (this.state.type) {
			case ParameterHintState.Type.Active: return this.state.hints;
			case ParameterHintState.Type.Pending: return this.state.previouslyActiveHints;
			default: return undefined;
		}
	}