LuaLS / LuaLS/lua-language-server
Type checking for functions as argument?
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- Dominant language
- Lua
- Stars
- 4.4k
- Forks
- 442
- PR merge metrics
- No merged PRs in 30d
Description
Is there something I can do have type checking for passed in functions?
```lua
---@param fn fun(i: integer)
local function accepts_integer_function(fn)
end
---@type fun(s: string)
local function mismatching_function(s)
end
-- expecting this to raise an error, but it doesn't
accepts_integer_function(mismatching_function)
```
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the minimal Lua example in the issue and trace how the language server checks accepts_integer_function's fun(i: integer) parameter against mismatching_function's fun(s: string) type. Done means the language server reports a type error at the call where the incompatible function is passed.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- lua
- Domain
- devtools
- Issue type
- Feature
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Active
- Clarity
- Mostly clear
- Newbie friendliness
- 55/100