Transformer: Map initialization patterns to getOrInsert APIs
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Nobody has claimed this yet.
Assessment
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Newbie friendliness
- 68/100
- Issue type
- Feature
- Clarity
- Mostly clear
- Activity status
- Quiet
- Tech stack
- javascript
- Domain
- tooling
Research direction
Start by inspecting the existing transformers in src/newlyAvailable/ and how they are exported from src/newlyAvailable.js. Add tests in tests/newlyAvailable/ covering the shown get-or-init patterns and unsafe side-effect cases, then document the transformer in README.md. Done means the safe patterns upgrade while side-effect behavior is preserved.
Written by the indexing model from the issue text.
Description
Summary
Add a transformer that upgrades common Map get-or-init patterns to getOrInsert/getOrInsertComputed.
Examples
// before
if (!cache.has(key)) {
cache.set(key, []);
}
const value = cache.get(key);
// after
const value = cache.getOrInsert(key, []);
// before
if (!cache.has(key)) {
cache.set(key, buildValue());
}
const value = cache.get(key);
// after
const value = cache.getOrInsertComputed(key, buildValue);
Scope
- Baseline category: newly available.
- Preserve side-effect behavior; skip unsafe cases.
Acceptance criteria
- Implement in src/newlyAvailable/
- Export from src/newlyAvailable.js
- Add tests in tests/newlyAvailable/
- Document in README.md
- Dominant language
- JavaScript
- Stars
- 15
- Forks
- 2
- Avg merge
- 2h 9m
- Merged PRs (30d)
- 28
Getting set up
- No Dockerfile or Docker Compose file
- No pull request template
- Read the contributing guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
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