Microsoft/TypeScript

Port from old compiler code to emit compilation flags into the source map

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#2,858 opened on Apr 22, 2015

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Description

The 1.0 (or 1.1) compiler emitted the compilation flags into the source map. We added this for hypothetical tooling scenarios, where browser tools could trigger a simple recompilation of a file discovered by a source map, in the case where it was live edited.

This is not a high priority as those scenarios aren't currently planned, but perhaps it would be a simple port of work already done.

Contributor guide

Tech stack
typescript
Domain
tooling
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.
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.
needs investigation
Prerequisites
TypeScript compiler internalssource mapsgit history
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
This issue involves porting an old feature from TypeScript 1.0/1.1 that emitted compilation flags into source maps. The contributor should search the git history for the original implementation, likely in the compiler source files such as src/compiler/. The current source map generation code is in src/compiler/emitter.ts or similar. The maintainer's comment says it might be a simple port, but details are sparse. The contributor should first understand how compilation flags are stored and then modify the source map emitter to include them, ensuring backward compatibility.
Port from old compiler code to emit compilation flags into the source map · Microsoft/TypeScript#2858 | Good First Issue