TS Refactoring to Infer type inserts ellipses, creating syntax error

[tehpsalmist]

TS Template added by @mjbvz

TypeScript Version: 4.1.0-dev.20200924

Search Terms

• code action
• quick fix

---

Version: 1.48.2
Commit: a0479759d6e9ea56afa657e454193f72aef85bd0
Date: 2020-08-25T10:09:08.021Z
Electron: 7.3.2
Chrome: 78.0.3904.130
Node.js: 12.8.1
V8: 7.8.279.23-electron.0
OS: Darwin x64 19.6.0

Steps to Reproduce:

1. have a sufficiently complex function argument (based on usage) in your TS file
2. Click on the TS Refactoring lightbulb and select "infer parameter types from usage"
3. Observe that nested objects of sufficient complexity may be replaced with ellipses, which is a syntax error.

Does this issue occur when all extensions are disabled?: Yes

[tehpsalmist]

update, just updated vs code to 1.49.0 and the issue persists.

[mjbvz]

Can you please share a self contained code sample that demonstrates this problem (as text)

[tehpsalmist]

This type is being inferred from across many files, so it's been hard creating a simpler case to demo it. Isn't it clear enough that the type info is being pulled from a truncated display version, rather than the real definition? Is that really not enough to at least investigate?

[tehpsalmist]

Ok, got something for you. Toss this in an index.ts:

function wut (hey) {
  const mmm: {
    oh: {
      why: string
      you: {
        playin: string[]
      }
    }
    yo: {
      ha: string
      right: boolean
      left: Symbol
    }
    dawg: {
      ha: number
      right: boolean
      left: Symbol
    }
    word: {
      yeah: {
        I: {
          cant: string
        }
        handle: {
          it: number
        }
        so: {
          I: boolean
          wont: string
        }
      }
      my: boolean
      dude: number
    }
  } = hey
}

Then try to use the infer from usage on the hey parameter