LuaLS / LuaLS/lua-language-server
Invalid type diagnostic doesn't show when passing value from array directly to a function
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Description
How are you using the lua-language-server?
Other
Which OS are you using?
Linux
What is the issue affecting?
Type Checking, Diagnostics/Syntax Checking
Expected Behaviour
When using a value from an array as a parameter I expect type checking to work.
Actual Behaviour
Type checking only works when I assign the value from the array to a temporary variable, not when passing it to a function directly.
Reproduction steps
This doesn't show a warning:
---@param num integer
function receive(num)
end
---@type (integer?)[]
local values = {}
receive(values[1])
This works:
local value = values[1]
receive(value) -- Cannot assign `integer?` to parameter `integer`.
Additional Notes
No response
Log File
No response
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
No source file or test is named. Start by reproducing the two Lua snippets and tracing the type-checking diagnostic path for a direct array-index argument versus a temporary variable; done means the direct call reports the same integer? to integer mismatch.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- lua
- Domain
- devtools
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Clearly specified
- Newbie friendliness
- 45/100