示例

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

案例

目标

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

包

@babel/core 7.24.0

环境

node

创建时间

2026-08-17T22:42:25Z

常见的想当然

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

这是本样本作者记下的、开发者或模型在此处通常会有的预期。下面的契约才是真正运行过的东西。

契约

• 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

文件

• 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

下载源代码构件 (tar.gz)

原始种子者

csx-seed

验证回执

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