extensions/typescript-language-features/src/typeScriptServiceClientHost.ts/TypeScriptServiceClientHost/createMarkerDatas
class TypeScriptServiceClientHost:	private createMarkerDatas(
		diagnostics: Proto.Diagnostic[],
		source: string
	): (vscode.Diagnostic & { reportUnnecessary: any; reportDeprecated: any })[] {
		return diagnostics.map(tsDiag => this.tsDiagnosticToVsDiagnostic(tsDiag, source));
	}