HighFile-scopeKotlin Plug & play

Add comprehensive input validation

Validate required parameters at boundaries using require/requireNotNull or explicit validators; fail fast with actionable messages.

Why this matters

Prevents propagation of invalid state and reduces downstream error handling complexity.

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

Avoid

fun createUser(email: String?) { save(email!!) }

Prefer

fun createUser(email: String?) {
  require(!email.isNullOrBlank()) { "email is required" }
  save(email)
}

Bad

fun f(id: String?) { use(id!!) }

Good

fun f(id: String?) { require(!id.isNullOrBlank()) { "id required" } }

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