If you cannot recognize the type of an expression that is assigned to a variable, you do not understand the program you are reading, so you must search its symbols anyway.
Writing redundantly the type when declaring the variable is of no help when you do not know whether the left hand side expression has the same type.
When reading any code base with which you are not familiar, you must not use a bad text editor, but either a good text editor designed for programmers or any other tool that allows fast searching for the definitions of any symbols encountered in the source text.
Adding useless redundancy to the source text only bloats it, making reading more difficult, not easier.
I never use an IDE, but I always use good programming language aware text editors.
If you cannot recognize the type of an expression that is assigned to a variable, you do not understand the program you are reading, so you must search its symbols anyway.
Writing redundantly the type when declaring the variable is of no help when you do not know whether the left hand side expression has the same type.
When reading any code base with which you are not familiar, you must not use a bad text editor, but either a good text editor designed for programmers or any other tool that allows fast searching for the definitions of any symbols encountered in the source text.
Adding useless redundancy to the source text only bloats it, making reading more difficult, not easier.
I never use an IDE, but I always use good programming language aware text editors.