prefer-readonly-parameter-types

💼 This rule is enabled in the ✅ recommended config.

Require function parameters to be typed as readonly to prevent accidental mutation of inputs.

⚙️ This rule is configurable.

💭 This rule requires type information.

This is the same thing as the @typescript-eslint/prefer-readonly-parameter-types rule, with the follow changes:

• The allow array is hard-coded to always contain ReadonlyMap and ReadonlySet.
• An additional option of "onlyRecordsArraysMapsSet" is added. This option will make the rule only examine a function parameter if it is a record, an array, a tuple, a map, or a set. (In other words, only "simple" types.) The option defaults to true. The motivation behind this option is that it reduces a ton of false positives, which still retaining the core value of the rule.

Resources

• How to use this rule
• Rule source
• Test source