fix: Eslint issues

src/detectors/typeChecker/FileLinter.ts

@@ -246,12 +246,15 @@ export default class FileLinter {
 			fnArgumentNode = node.arguments.find((arg: ts.Expression) =>
 				arg.kind === ts.SyntaxKind.Identifier && arg.getText() === settings.fnArgument);
 		}
-		return fnArgumentNode || null;
+		return fnArgumentNode ?? null;
 	}
 
 	checkLibInitCall(node: ts.CallExpression) {
 		const nodeExp = node.expression as ts.PropertyAccessExpression;
 		const {symbol} = this.#checker.getTypeAtLocation(nodeExp);
+		// TS parser uses some intermediate types that are not available as definitions.
+		// In this case SymbolObject which is a ts.Symbol + ts.Node and that's 
+		// why we need these ugly type castings
 		const importDeclaration =
 			((((symbol as unknown) as ts.Node)?.parent?.parent as unknown) as ts.Symbol)?.getEscapedName() as string;