perf(mangler): optimize handling of collecting lived scope ids #8724
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CodSpeed Performance ReportMerging #8724 will improve performances by 6.82%Comparing Summary
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Just some low-hanging fruit optimization. I initially want to dedupe for reference scopes, so that we can avoid calling `scope_tree.ancestors(used_scope_id).take_while(|s_id| *s_id != scope_id)` for duplicate `used_scope_id` but the overhead of calling `unique` or `dedup` is over the improvement.
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## [0.48.1] - 2025-01-26 ### Features - b7f13e6 ast: Implement utf8 to utf16 span converter (#8687) (Boshen) - 6589c3b mangler: Reuse variable names (#8562) (翠 / green) - 29bd215 minifier: Minimize `Infinity.toString(radix)` to `'Infinity'` (#8732) (Boshen) - e0117db minifier: Replace `const` with `let` for non-exported read-only variables (#8733) (sapphi-red) - 9e32f55 minifier: Evaluate `Math.sqrt` and `Math.cbrt` (#8731) (sapphi-red) - 360d49e minifier: Replace `Math.pow` with `**` (#8730) (sapphi-red) - 2e9a560 minifier: `NaN.toString(radix)` is always `NaN` (#8727) (Boshen) - cbe0e82 minifier: Minimize `foo(...[])` -> `foo()` (#8726) (Boshen) - e9fb5fe minifier: Dce pure expressions such as `new Map()` (#8725) (Boshen) ### Bug Fixes - 0944758 codegen: Remove parens from `new (import(''), function() {})` (#8707) (Boshen) - 33de70a mangler: Handle cases where a var is declared in a block scope (#8706) (翠 / green) - d982cdb minifier: `Unknown.fromCharCode` should not be treated as `String.fromCharCode` (#8709) (sapphi-red) - e7ab96c transformer/jsx: Incorrect `isStaticChildren` argument for `Fragment` with multiple children (#8713) (Dunqing) - 3e509e1 transformer/typescript: Enum merging when same name declared in outer scope (#8691) (branchseer) ### Performance - dc0b0f2 manger: Remove useless `tmp_bindings` (#8735) (Dunqing) - e472ced mangler: Optimize handling of collecting lived scope ids (#8724) (Dunqing) - 8587965 minifier: Normalize `undefined` to `void 0` before everything else (#8699) (Boshen) ### Refactor - 58002e2 ecmascript: Remove the lifetime annotation on `MayHaveSideEffects` (#8717) (Boshen) - 10e5920 linter: Move finishing default diagnostic message to `GraphicalReporter` (#8683) (Sysix) - 52a37d0 mangler: Simplify initialization of `slots` (#8734) (Dunqing) - 6bc906c minifier: Allow mutating arguments in methods called from `try_fold_known_string_methods` (#8729) (sapphi-red) - bf8be23 minifier: Use `Ctx` (#8716) (Boshen) - 0af0267 minifier: Side effect detection needs symbols resolution (#8715) (Boshen) - 32e0e47 minifier: Clean up `Normalize` (#8700) (Boshen) - c792068 semantic: Simplify `ScopeTree::iter_bindings` (#8723) (Dunqing) ### Testing - 03229c5 minifier: Fix broken tests (#8722) (Boshen) Co-authored-by: Boshen <1430279+Boshen@users.noreply.github.com>
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Just some low-hanging fruit optimization.
I initially want to dedupe for reference scopes, so that we can avoid calling
scope_tree.ancestors(used_scope_id).take_while(|s_id| *s_id != scope_id)for duplicateused_scope_idbut the overhead of callinguniqueordedupis over the improvement.