Microsoft/TypeScript

Parameter completion for arrow/anonymous functions

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#51,427 opened on Nov 7, 2022

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 (2 comments) (6 reactions) (0 assignees)TypeScript (48,455 stars) (6,726 forks)batch import
Experience EnhancementHelp WantedSuggestion

Description

Auto complete the parameters of anonymous functions. JavaScript and most other languages already name the parameters when the function is defined and you can see these names while you are writing the function, but why not complete the whole statement, or at least complete the names when in the parentheses.

JavaScript already knows the param names image

How IntelliJ handles it image image

Contributor guide

Tech stack
typescript
Domain
developer experiencetooling
Issue type
feature
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.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
TypeScript compiler internalslanguage servicecode completion
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
25
Research direction
The issue requests auto completion of parameters for arrow/anonymous functions. It includes screenshots showing how IntelliJ handles it. To implement, one needs to understand the TypeScript language service completion logic, likely in src/services/completions.ts or similar files. The existing parameter name completion for regular functions can serve as a reference. There are no linked PRs; the issue is open for first time contributors but requires deep knowledge of the compiler.