HighFile-scopeDart Plug & play

Do Not Assign Values to `void` Variables

Avoid assigning values to `void` variables as `void` is not a compatible type and doing so results in runtime errors.

Why this matters

In Dart, `void` is a type that does not hold values. Assigning a value to a `void` variable is a logical error.

Side-by-side examples engineers can pattern-match during review.

Avoid

void x;
x = 3; // Non compliant

Prefer

dynamic x; // type of x not known
x = 3;

Bad

void x;
x = 3; // Non compliant

Good

dynamic x; // type of x not known
x = 3;

From the same buckets as this rule.

Critical
Avoid equality operators in loop termination conditions
Check if loops use equality operators (== or !=) in termination conditions. These can lead to infinite loops if the condition is never met exactly. Instead, use relational operators like < or > for safer loop termination.
error-handlingreadability-refactor
Critical
Avoid Returning Null in Non-Async Task Methods
Returning null from a Task or Task<T> method causes a NullReferenceException if awaited. Use Task.CompletedTask or Task.FromResult<T>(null) instead.
error-handlingreadability-refactor+1
Critical
Avoid Using Boolean Expressions in `except` Statements
Detect `except` clauses that use `or` or `and` to catch multiple exceptions. This does not work as intended. Recommend using a tuple of exceptions instead.
error-handlingstack-python