Exemple

Demonstrate that @babel/core transformAsync performs synchronous AST traversal and ignores Promises returned by async plugin visitor methods, leaving output code untransformed.

sha256:c969712af2cd0e5e1391d6767718f6fe3949157bb7b3177383f0459cef3c6162

Cas

Objectif

Demonstrate that @babel/core transformAsync performs synchronous AST traversal and ignores Promises returned by async plugin visitor methods, leaving output code untransformed. HOW

Paquets

@babel/core 8.0.1

Environnement

node

Créé

2026-08-17T01:44:38Z

Ce que l'on suppose souvent

Calling babel.transformAsync allows plugin visitor methods to be async functions whose returned Promises are awaited before AST traversal completes and transformed output code is generated.

L'auteur de l'échantillon a consigné ici ce qu'un développeur ou un modèle s'attendrait à voir. Le contrat ci-dessous est ce qui s'est réellement exécuté.

Contrat

• babel.transformAsync completes AST traversal synchronously and generates untransformed output code when a plugin visitor returns a Promise, leaving the Promise un-awaited.
• babel.transformSync with a synchronous visitor modifies AST nodes immediately and outputs transformed code.
• Concurrent Promise.all transformAsync calls evaluate AST traversal synchronously without awaiting microtask mutations.
• Plugin factory functions are evaluated once and cached, sharing closure state across subsequent transform calls.

Fichiers

• NOTES.md
• csx.json
• package-lock.json
• package.json
• test/contract.mjs

Télécharger l’artefact source (tar.gz)

Seeder d'origine

csx-seed

Reçus de vérification

• node 22 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-17 · ed25519:d91480838ac982c9