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Type Functions

Type functions are functions that run during analysis time and operate on types, instead of runtime values. They can use the types library to transform existing types or create new ones.

Here’s a simplified implementation of the builtin type function keyof. It takes a table type and returns its property names as a union of singletons.

Type function environment<br>Section titled “Type function environment”

In addition to the types library, type functions have access to:

assert, error, print

next, ipairs, pairs

select, unpack

getmetatable, setmetatable

rawget, rawset, rawlen, raweq

tonumber, tostring

type, typeof

math library

table library

string library

bit32 library

utf8 library

buffer library