avoid-hardcoded-numbers

v1.40.0

warning

effort: 2m

configurable

pro+

Warns when a configured class invocation has an argument with a hardcoded number literal.

note

This rule requires configuration in order to highlight any issues.

⚙️ Config

Set entries (default is empty) to configure the list of class invocations.

Each entry is an object with 2 fields: name and args:

• Set name to configure the name of the invocation.
• Set args to configure a list of arguments that should not be a hardcoded number literal.

analysis_options.yaml

dcm:
  rules:
    - avoid-hardcoded-numbers:
        entries:
          - name: Column
            args:
              - spacing
          - name: SomeClass.named
            args:
              # if there is no "padding" named argument,
              # the positional argument with the same name will be checked instead
              - padding

Example

❌ Bad:

Column(
  // LINT: Avoid hardcoded numbers. Try using an existing constant or variable.
  spacing: 10,
  children: [
    ...
  ],
);

Column(
  // LINT: Avoid hardcoded numbers. Try using an existing constant or variable.
  spacing: 10.5,
  children: [
    ...
  ],
);

✅ Good:

const _spacing = 10;

Column(
  spacing: _spacing,
  children: [
    ...
  ],
);