Microsoft/TypeScript

'Omit' should alias a distinct mapped type (for display purposes)

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#31,104 opened on Apr 24, 2019

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 (8 comments) (5 reactions) (1 assignee)TypeScript (6,726 forks)batch import
Effort: ModerateExperience EnhancementFix AvailableHelp WantedSuggestion

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Description

Today, Omit will expand to Pick<Exclude<...>, ...> in quick info, error messages, etc. which is gross.

By defining Omit as its own conditional type, we can get a slightly nicer display, though it will introduce duplication of code between the two helpers.

Contributor guide

Research direction
Examine the existing implementation of Omit in checker.ts and create a new alias type that maps directly instead of using Pick<Exclude<...>>.
Tech stack
typescript
Domain
compilers
Issue type
Refactor
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.
Half day
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
TypeScriptMapped types
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30