Functions/properties exposed as public APIs of a library should have an explicit return type. Inferred return type can easily be changed by mistake which may lead to breaking changes.

Noncompliant Code

// code from a library
val strs = listOf("foo, bar")
fun bar() = 5
class Parser {
    fun parse() = ...
}

Compliant Code

// code from a library
val strs: List<String> = listOf("foo, bar")
fun bar(): Int = 5

class Parser {
    fun parse(): ParsingResult = ...
}

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