Registry / testing / jest-serializer-babel-ast

jest-serializer-babel-ast

library0.0.5jsnpmunverified

A Jest snapshot serializer that pretty-prints Babel AST nodes (e.g., from @babel/parser) in a human-readable, indented format. Current stable version is 0.0.5 (unreleased beyond). No active release cadence; maintained sporadically. Differentiators: provides a clean, nested view of AST node properties, ideal for snapshot testing Babel plugins or AST transformations. Compared to alternatives like jest-serialize, it is purpose-built for Babel AST and outputs structured property lists. Works with Jest snapshotSerializers configuration.

testing

npm install jest-serializer-babel-ast

github ↗package ↗

INSTALL

IMPORT

SIG · JEST-SERIALIZER-BA

jest-serializer-babel-ast

testingjavascriptv0.0.5

Install

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Import

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Disk

—

Pass rate

0/ 6

Env Coverage0 / 6

glibc

18–22

musl

18–22

Install & Compatibility

Where this runs

tested against v? · npm install

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

node 18–226 runs

build_error

glibc

node 18–226 runs

build_error

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

jest-serializer-babel-ast

✓ Add to jest.snapshotSerializers in package.json or jest.config.js: 'jest-serializer-babel-ast'

✗ import serializer from 'jest-serializer-babel-ast'

This is a Jest serializer, not a module you import directly. It is loaded automatically via Jest configuration.

expect.addSnapshotSerializer

✓ expect.addSnapshotSerializer(require('jest-serializer-babel-ast'))

✗ const serializer = require('jest-serializer-babel-ast').default

If using programmatic registration with expect.addSnapshotSerializer, use require() directly; the package does not export a default.

default (CommonJS)

✓ const serializer = require('jest-serializer-babel-ast')

✗ const { serialize } = require('jest-serializer-babel-ast')

The package exports the serializer object directly (with serialize and test methods), not named exports.

Configures Jest to use the serializer, then generates a human-readable AST snapshot from parsed code.

// jest.config.js or package.json module.exports = { snapshotSerializers: ['jest-serializer-babel-ast'] } // test file const { parse } = require('@babel/parser'); test('AST snapshot', () => { const ast = parse('const x = 1;', { sourceType: 'module' }); expect(ast).toMatchSnapshot(); }); // Snapshot output will show structured AST instead of JSON.

Debug

Known issues

gotchaWorks only with Babel AST nodes from @babel/parser (babylon). May not handle other parsers or custom AST types.

fix

Ensure you are using @babel/parser (or babylon) to generate AST nodes.

affects: >=0.0.0

gotchaThe serializer expects nodes with a 'type' property; non-AST objects will not be serialized by this serializer.

fix

Make sure the snapshot content contains Babel AST nodes. For other objects, Jest's default serializer will be used.

affects: >=0.0.0

deprecatedThe package is no longer actively maintained. There are no security issues reported, but bugs may remain unaddressed.

fix

Consider alternatives like jest-serializer-ast or writing your own serializer with a library like pretty-format.

affects: >=0.0.0

gotchaSerializer may not show private properties (prefixed with underscore) or Babel node internal metadata (e.g., start/end locations) unless they are enumerable.

fix

If you need location data, configure Babel parser to include 'ranges' or check the node's 'loc' property.

affects: >=0.0.0

Errors

Common errors & fixes

Cannot find module 'jest-serializer-babel-ast'

Package not installed or not present in node_modules.

fix

Run: npm install jest-serializer-babel-ast --save-dev

TypeError: serializer.serialize is not a function

Importing the package incorrectly, e.g., using import default or expecting named exports.

fix

Use: const serializer = require('jest-serializer-babel-ast');

Upgrade

Version history

0.0.5latest on npm

Audit

Dependencies

No dependency data recorded yet.

Agent activity

4 hits · last 30 days

node

Resources

githubhttps://github.com/jasonLaster/jest-serializer-babel-ast ↗

packagehttps://www.npmjs.com/package/jest-serializer-babel-ast ↗