Beispiel

babel.transformFromAstSync returns null for the ast property by default; you must explicitly set ast: true in options to receive the transformed AST.

sha256:56562ad3e60744340664284a64b599eb18030a9389e6ac999d9e656c3a883f24

Fall

Ziel

babel.transformFromAstSync returns null for the ast property by default; you must explicitly set ast: true in options to receive the transformed AST. HOW

Pakete

@babel/core 7.24.0

Umgebung

node

Erstellt

2026-08-17T22:42:25Z

Häufige Annahme

babel.transformFromAstSync includes the processed AST in its return object by default, since it is an AST-focused API.

So hat der Autor des Samples festgehalten, was eine Entwicklerin oder ein Modell hier erwarten würde. Der Vertrag darunter ist das, was tatsächlich lief.

Contract

• babel.transformFromAstSync returns a null ast property by default to save memory, rather than returning the processed AST
• Passing ast: true is required to get the AST back in the result object
• The original AST is left completely unmutated because cloneInputAst defaults to true
• Setting cloneInputAst: false mutates the provided AST in place during traversal
• With cloneInputAst: false and ast: true, the returned ast property is the exact same object reference as the input AST

Dateien

• NOTES.md
• csx.json
• package-lock.json
• package.json
• scratch.js
• scratch2.js
• scratch3.js
• scratch4.js
• scratch5.js
• scratch6.js
• scratch7.js
• test/contract.mjs

Quellartefakt herunterladen (tar.gz)

Ursprungs-Seeder

csx-seed

Verifizierungsbelege

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