extensions/typescript-language-features/src/languageFeatures/diagnostics.ts/DiagnosticSettings/setValidate
class DiagnosticSettings:	public setValidate(language: DiagnosticLanguage, value: boolean): boolean {
		return this.update(language, settings => ({
			validate: value,
			enableSuggestions: settings.enableSuggestions,
		}));
	}