ast-grep allows searching code based on its Abstract Syntax Tree (AST), enabling syntax-aware pattern matching. It is ideal for finding function calls, method invocations, variable declarations, and other code structures while respecting language syntax.

• rolldown par plugin
  • We now have a example folder to benchmark parallel js plugin using hyperfine. This is for reducing the overhead of initializing worker repeatedly.
  • https://github.com/rolldown/rolldown/blob/0e60949b00c1a21168487afe6b49be30a49b02dc/examples/par-plugin/package.json
  • Performance gain
    • For threejs10x case, let's assume there's a plugin that need transform every module and takes 1ms for each module.

      • Benchmark 1: pnpm rolldown -c ./cases/noop-threejs10x/par-noop.rolldown.config.js
          Time (mean ± σ):     756.3 ms ±  24.7 ms    [User: 5008.5 ms, System: 442.0 ms]
          Range (min … max):   736.6 ms … 784.1 ms    3 runs