parcel-bundler / parcel-bundler/lightningcss
Nesting misses selector minification opportunity
Open
Nobody has claimed this yet.
area: minification
- Dominant language
- Rust
- Stars
- 7.7k
- Forks
- 302
- PR merge metrics
- No merged PRs in 30d
Description
With CSS nesting
a {
cursor:pointer;
+ b {
cursor:pointer;
}
}
compiles to
a{cursor:pointer}a+b{cursor:pointer}
Without CSS nesting
a {
cursor:pointer;
}
a + b {
cursor:pointer;
}
compiles to
a,a+b{cursor:pointer}
Contributor 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.
Research direction
Start from the CSS nesting and selector minification paths, using the issue's nested and non-nested examples as the expected comparison. Add a regression case for equivalent selectors and verify that the nested form is combined when safe; run the relevant minifier test suite to confirm the optimized output.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- css, rust
- Domain
- tooling
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100