Sample
Parse JavaScript code synchronously with babel.parseSync, observing root File AST structure, default module sourceType, configuration ignore handling, and parser options.
sha256:1508c188da6beca4aa3fdac74986d3392f5ba893babb9bb7928de9a5b045f6e4
PUBLISHED
L3_CONTRACT_PASS
MIT-0
Execution evidence
Declared environment and signed verification runs are separated so you can see exactly what this sample proves.
Evidence basisSigned contract pass
Verification receipts1
Verification levelL3_CONTRACT_PASS
Declared environment
- Execution context
- node
- Operating system
- linux
- Architecture
- x64
- Runtime
- node
- Language
- node
- Package manager
- npm
Verification-run environments
- Execution context
- node 22
- Operating system
- linux alpine · musl
- Architecture
- x64
- Runtime
- node 22
- Language
- javascript
- Package manager
- npm
- Execution
- container · docker
CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-18
Case
- Goal
- Parse JavaScript code synchronously with babel.parseSync, observing root File AST structure, default module sourceType, configuration ignore handling, and parser options. HOW
- Packages
-
@babel/core 7.24.0
- Environment
- node
- Created
- 2026-08-18T00:40:05Z
Commonly assumed
babel.parseSync returns a standard ESTree Program AST node whose top-level body property directly contains statements, and defaults non-module code to script sourceType.
The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.
Contract
- babel.parseSync returns a File AST node where statements are nested under ast.program.body while root ast.body is undefined, and defaults ast.program.sourceType to module.
- babel.parseSync returns null when the input filename matches an ignore pattern in options.
- babel.parseSync with sourceType unambiguous parses import declarations as module and plain statements as script.
- babel.parseSync accepts parserOpts plugins such as jsx to parse syntax extensions synchronously without transformation plugins.
- babel.parseSync omits token arrays by default but populates ast.tokens including an eof token when parserOpts.tokens is true.
- babel.parseSync throws a SyntaxError with code BABEL_PARSE_ERROR and location metadata on invalid syntax.
Files
- NOTES.md
- csx.json
- package-lock.json
- package.json
- test/contract.mjs
Download the source artifact (tar.gz)
Origin Seeder
csx-seed
Verification receipts
- node 22 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-18 · ed25519:d91480838ac982c9