- We now remap parameters using a new syntax context. This is required because we may copy functions, and it can result in duplicated variables with respect to the span hygiene.
- We now visit the sequence expression generated by inlining. This is to improve performance in some cases.
- We now remove variables from variable statements if it's identical to a parameter declared in the function.
- IIFE evaluation is now aware of `this` being different for member expressions.
- We now have more logic for detecting simple functions.
swc_ecma_transforms_optimization:
- `expr_simplifier`: Track more changes.
swc_ecma_minifier:
- Analyze after applying the pure optimizer.
- Preserve access to a variable not in scope.
- `compress`: Remove string literal if it was not a directive.
- `pure/collapse_vars`: Merge vars declared in the first statement into one with initializers if `collapse_vars` and `join_vars` are enabled.
- `unused`: Use `usage_count` instead of `ref_count`.
- `unused`: Fix dropping rule for member expressions.
- `unused`: Fix dropping rule for declarations.
- `hoist_props`: Preserve exported items.
swc_ecma_minifier:
- Add `fake_block` mark.
- Inject statements for side effects from `visit_mut_stmt` instead of `visit_mut_stmt_likes`. (Closes#2926)
