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Is there a way of limiting stdlib functions' visibility in Kotlin?

Kotlin comes with many standard library functions, a lot of which are visible by default without actually importing them. So functions like listOf, arrayListOf, ArrayList<T>(), ... are de facto inserted into global namespace. Is there a compiler flag that would disable this behavior?

Solution

  • Sadly, you can't. just as you can't prohibit the auto-imported java.lang package in java.

    You don't need to worry about the auto-imported top-level functions. If you don't use any top-level functions, there is no Class Reference/Method Reference emitted to the Java byte code. And all of the *arrayOf functions will be transformed to Java array creation, for example:

    Kotlin          |        Java
------------------------------------
byteArrayOf     |    new byte[]
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shortArrayOf    |    new short[]
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intArrayOf      |    new int[]
------------------------------------
longArrayOf     |    new long[]
------------------------------------
floatArrayOf    |    new float[]
------------------------------------
doubleArrayOf   |    new double[]
------------------------------------
charArrayOf     |    new char[]
------------------------------------
booleanArrayOf  |    new boolean[]
------------------------------------
arrayOf<T>      |    new T[]
------------------------------------