src/vs/workbench/api/common/extHostDiagnostics.ts/DiagnosticCollection/constructor
class DiagnosticCollection:	constructor(
		private readonly _name: string,
		private readonly _owner: string,
		private readonly _maxDiagnosticsPerFile: number,
		private readonly _proxy: MainThreadDiagnosticsShape | undefined,
		private readonly _onDidChangeDiagnostics: Emitter<vscode.Uri[]>
	) { }