No description
efe084b7e7
This PR improves the performance of when we need to clone some AST
nodes. We have a few places where we clone `Candidate`, `Variant` and
CSS `AST` nodes.
Right now we use `structuredClone`, which works, but it is a generic
solution. However, we do know the exact structure of these AST nodes, so
we can write specialized clone functions that are much faster.
## Test plan
1. All the tests still pass with this change
2. The performance is better:
```
cloneCandidate - src/candidate.bench.ts > Candidate cloning
1.72x faster than cloneCandidate (spread)
74.03x faster than structuredClone
cloneAstNode() - src/ast.bench.ts > Cloning AST nodes
1.15x faster than cloneAstNode (with spread)
33.54x faster than structuredClone()
```
Ready for review, but should be merged after #19059
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