Reduce bundle size of parser-babel.js

[sosukesuzuki]

Description

Reduce parser-babel.js by 35kb.

Before:

$ node ./scripts/build/build.mjs --print-size --report --file=parser-babel.js
 Building packages 
parser-babel.js.................................................337 kB    DONE  

After:

$ node ./scripts/build/build.mjs --print-size --report --file=parser-babel.js
 Building packages 
parser-babel.js.................................................302 kB    DONE  

Checklist

• I’ve added tests to confirm my change works.
• (If changing the API or CLI) I’ve documented the changes I’ve made (in the docs/ directory).
• (If the change is user-facing) I’ve added my changes to changelog_unreleased/*/XXXX.md file following changelog_unreleased/TEMPLATE.md.
• I’ve read the contributing guidelines.

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