Color-free code when filename starts with upper-case

Question

I am using Intellij IDEA to develop using Flutter but when I name a new class with its name starting in uppercase the typed code remains the same color without highlighting variables, Keywords and etc.

This image illustrates the code in a class starting with low-case call: odoo_services.dart. Note that the typed code has the colored effects.

Now, the image illustrates the code of the class called: OdooServices.dart and code without color effects.

Note: The code compiles and works correctly, the only problem is the color effects in the code.

Answer 1

The Dart language differentiates the classes(colors) by the first letter of the word, in the case in my visual studio code it turns green when I put the first letter uppercase.

It is more or less an obligation to keep the code according to good kkk practices

Answer 2

Flutter is written in Dart, and by Dart’s good practice the filename should always start with lowercase letter and in "snake_case", follows reference:

https://www.dartlang.org/guides/language/effective-dartstyle#do-name-Libraries-and-source-files-using-lowercase_with_underscores

The "error" you have in your IDE must be some way the text editor alerts you that it has escaped the language standard.