Microsoft/TypeScript

Create Annex B lib target

Open

#19,299 opened on Oct 18, 2017

View on GitHub
 (3 comments) (17 reactions) (0 assignees)TypeScript (48,455 stars) (6,726 forks)batch import
CommittedEffort: ModerateHelp WantedSuggestion

Description

image

Annex B is the 🚽 of JavaScript with such features like a broken escape method and the blink method for strings. We shouldn't offer broken functions by default, and (almost) no one wants to see fontcolor in their string completion list, but it is "standard", so we should have a separate lib target (in the same category as e.g. dom) for annex-b that squirrels away the Annex B declarations so people can still opt in if they want to.

Contributor guide

Tech stack
typescriptjavascript
Domain
frontenddeveloper 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.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
TypeScript compiler internalsECMAScript specificationlib declaration files
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40
Research direction
The issue requests a new lib target for Annex B features. To implement, study how existing lib targets (e.g., 'dom', 'es2015') are defined in the TypeScript repository. Look at files like 'src/lib/dom.generated.d.ts' and the target configuration in 'src/compiler/commandLineParser.ts'. Create a new file 'lib/annex b.d.ts' with the relevant declarations and register it in the compiler's lib map. The issue comments may provide additional guidance on which features to include.