extensions/typescript-language-features/src/utils/managedFileContext.ts/ManagedFileContextManager/constructor
class ManagedFileContextManager:	public constructor(
		activeJsTsEditorTracker: ActiveJsTsEditorTracker,
		private readonly normalizePath: (resource: vscode.Uri) => string | undefined,
	) {
		super();
		activeJsTsEditorTracker.onDidChangeActiveJsTsEditor(this.onDidChangeActiveTextEditor, this, this._disposables);

		this.onDidChangeActiveTextEditor(activeJsTsEditorTracker.activeJsTsEditor);
	}