LuaLS / LuaLS/lua-language-server
Fields of a generic class can't pass the generic to another generic class
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- Dominant language
- Lua
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Description
How are you using the lua-language-server?
NeoVim
Which OS are you using?
Linux
What is the issue affecting?
Type Checking
Expected Behaviour
local works = f.a -- type is `number[]`
local doesnt = f.b -- type is `table<string, number>`
local also_doesnt = f.b["hello"] -- type is `number`
Actual Behaviour
local works = f.a -- type is `number[]`
local doesnt = f.b -- type is `table<string, <T>>`
local also_doesnt = f.b["hello"] -- type is `<V>`
Reproduction steps
---@class Foo<T>
---@field a T[]
---@field b table<string, T>
---@type Foo<number>
local f = {}
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
Start with the Lua reproduction for Foo and inspect how type checking resolves fields a and b when Foo is used. Confirm that the nested table field and indexed value retain number rather than unresolved generic placeholders; done means both reported types match the expected behavior.
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
- Quiet
- Clarity
- Mostly clear
- Newbie friendliness
- 65/100