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Overridable constants

const​

Constant definition.

Constants can be used all across functions, exported and imported. If a constant is defined using ?= , it can be overridden by value via compiler flags or imported values.

aqua
-- This can be overridden with --const 'TARGET_PEER_ID = "other peer id"'
const TARGET_PEER_ID ?= "this is a target peer id"
-- This constant cannot be overridden
const SERVICE_ID = "service id"
aqua
-- This can be overridden with --const 'TARGET_PEER_ID = "other peer id"'
const TARGET_PEER_ID ?= "this is a target peer id"
-- This constant cannot be overridden
const SERVICE_ID = "service id"

You can assign only literals to constants. Constant type is the same as literal type. You can override only with a subtype of that literal type.