Microsoft/TypeScript

Preselect completion list entries based on contextual type

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#8,198 opened on Apr 19, 2016

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 (2 comments) (0 reactions) (0 assignees)TypeScript (6,726 forks)batch import
Domain: APIHelp WantedSuggestion

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Description

It should be cool if tsserver could provide a new command guesstypes to give the capability to guess parameter types when completion is applied

In other word, I would like to support the same feature that I have done with tern

For instance if you open completion for document and select addEventListener :

Tern completion

When you apply completion, I would like call a tsserver command 'guesstypes' to retrieve variables, functions for each function parameters. Here a screenshot which shows a list of variable with string type for the addEventListener type argument :

Tern completion

Contributor guide

Research direction
Study the existing tsserver completion logic and the 'completionInfo' command. Then understand how to infer parameter types from contextual type information. Look at the code that handles signature help and completion item resolution.
Tech stack
typescript
Domain
developer experience
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
TypeScript
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40