extensions/typescript-language-features/src/languageFeatures/diagnostics.ts/DiagnosticsManager/constructor
class DiagnosticsManager:	constructor(
		owner: string,
		onCaseInsensitiveFileSystem: boolean
	) {
		super();
		this._diagnostics = new ResourceMap<FileDiagnostics>(undefined, { onCaseInsensitiveFileSystem });
		this._pendingUpdates = new ResourceMap<any>(undefined, { onCaseInsensitiveFileSystem });

		this._currentDiagnostics = this._register(vscode.languages.createDiagnosticCollection(owner));
	}