Microsoft/TypeScript

Getting completions when writing out a dot in a parameter should suggest the splat operator

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#4,262 opened on Aug 10, 2015

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 (8 comments) (0 reactions) (0 assignees)TypeScript (48,455 stars) (6,726 forks)batch import
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Description

At present the completions returned seem arbitrary. Example:

function(arg: string, ./**/): any {
}

Getting completions at the marker yields the typical alphabetical list of global things - worse yet, in VSCode, pressing . again auto-completes the first one (.AbstractWorker. isn't really a valid argument name)! Very frustrating.

Contributor guide

Tech stack
typescript
Domain
developer experiencetooling
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
over 1 week
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
understanding of TypeScript compiler internals
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
15
Research direction
The issue describes a bug where typing a dot in a function parameter list triggers arbitrary completions instead of suggesting the splat operator (...). The TypeScript language service's completion logic in `src/services/completions.ts` likely handles this. Investigate the relevant code, especially the `getCompletionsAtPosition` function, and understand how completions are filtered for parameter contexts. Look for any existing tests related to parameter completions. Consider proposing a change that adds a completion entry for `...` when a dot is typed after a parameter name. Review the issue comments for any additional insights or constraints.