Nodiscard Functions

Functions can be declared nodiscard, causing a warning to be raised when the return value is discarded:

local function add(a, b) <nodiscard>
    return a + b
end

add(1, 2)

file.pluto:5: warning: discarding return value of function declared '<nodiscard>' [discarded-return]
    5 | add(1, 2)
      | ^^^^^^^^^ here

This can also be combined with type hints:

local function add(a: number, b: number): number <nodiscard>
    return a + b
end

info

The warning coverage is currently limited to local functions.