{"id":20154,"library":"jest-serializer-babel-ast","title":"jest-serializer-babel-ast","description":"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.","status":"maintenance","version":"0.0.5","language":"javascript","source_language":"en","source_url":"https://github.com/jasonLaster/jest-serializer-babel-ast","tags":["javascript"],"install":[{"cmd":"npm install jest-serializer-babel-ast","lang":"bash","label":"npm"},{"cmd":"yarn add jest-serializer-babel-ast","lang":"bash","label":"yarn"},{"cmd":"pnpm add jest-serializer-babel-ast","lang":"bash","label":"pnpm"}],"dependencies":[],"imports":[{"note":"This is a Jest serializer, not a module you import directly. It is loaded automatically via Jest configuration.","wrong":"import serializer from 'jest-serializer-babel-ast'","symbol":"jest-serializer-babel-ast","correct":"Add to jest.snapshotSerializers in package.json or jest.config.js: 'jest-serializer-babel-ast'"},{"note":"If using programmatic registration with expect.addSnapshotSerializer, use require() directly; the package does not export a default.","wrong":"const serializer = require('jest-serializer-babel-ast').default","symbol":"expect.addSnapshotSerializer","correct":"expect.addSnapshotSerializer(require('jest-serializer-babel-ast'))"},{"note":"The package exports the serializer object directly (with serialize and test methods), not named exports.","wrong":"const { serialize } = require('jest-serializer-babel-ast')","symbol":"default (CommonJS)","correct":"const serializer = require('jest-serializer-babel-ast')"}],"quickstart":{"code":"// jest.config.js or package.json\nmodule.exports = {\n  snapshotSerializers: ['jest-serializer-babel-ast']\n}\n\n// test file\nconst { parse } = require('@babel/parser');\n\ntest('AST snapshot', () => {\n  const ast = parse('const x = 1;', { sourceType: 'module' });\n  expect(ast).toMatchSnapshot();\n});\n\n// Snapshot output will show structured AST instead of JSON.\n","lang":"javascript","description":"Configures Jest to use the serializer, then generates a human-readable AST snapshot from parsed code."},"warnings":[{"fix":"Ensure you are using @babel/parser (or babylon) to generate AST nodes.","message":"Works only with Babel AST nodes from @babel/parser (babylon). May not handle other parsers or custom AST types.","severity":"gotcha","affected_versions":">=0.0.0"},{"fix":"Make sure the snapshot content contains Babel AST nodes. For other objects, Jest's default serializer will be used.","message":"The serializer expects nodes with a 'type' property; non-AST objects will not be serialized by this serializer.","severity":"gotcha","affected_versions":">=0.0.0"},{"fix":"Consider alternatives like jest-serializer-ast or writing your own serializer with a library like pretty-format.","message":"The package is no longer actively maintained. There are no security issues reported, but bugs may remain unaddressed.","severity":"deprecated","affected_versions":">=0.0.0"},{"fix":"If you need location data, configure Babel parser to include 'ranges' or check the node's 'loc' property.","message":"Serializer may not show private properties (prefixed with underscore) or Babel node internal metadata (e.g., start/end locations) unless they are enumerable.","severity":"gotcha","affected_versions":">=0.0.0"}],"env_vars":null,"last_verified":"2026-04-25T00:00:00.000Z","next_check":"2026-07-24T00:00:00.000Z","problems":[{"fix":"Run: npm install jest-serializer-babel-ast --save-dev","cause":"Package not installed or not present in node_modules.","error":"Cannot find module 'jest-serializer-babel-ast'"},{"fix":"Use: const serializer = require('jest-serializer-babel-ast');","cause":"Importing the package incorrectly, e.g., using import default or expecting named exports.","error":"TypeError: serializer.serialize is not a function"}],"ecosystem":"npm","meta_description":null,"install_score":null,"install_tag":null,"quickstart_score":null,"quickstart_tag":null}