Registry / devops / babel-preset-kyt-core

babel-preset-kyt-core

library2.0.1jsnpmunverified

An opinionated Babel preset optimized for kyt, the NYTimes' universal JavaScript toolchain. Current version 2.0.1, released November 2023. It provides a curated set of Babel plugins and presets for modern JavaScript and React, including @babel/preset-env, @babel/preset-react, and @babel/preset-typescript, with automatic polyfill injection via core-js. Unlike generic presets, it is tuned for kyt's isomorphic architecture, supporting both client and server builds. It follows a semver release cadence alongside kyt packages, with maintenance as active.

devops serialization

npm install babel-preset-kyt-core

github ↗package ↗

INSTALL

IMPORT

SIG · BABEL-PRESET-KYT-C

babel-preset-kyt-core

devopsjavascriptv2.0.1

Install

—

Import

—

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.

default

✓ module.exports = require('babel-preset-kyt-core')

✗ import preset from 'babel-preset-kyt-core'

CJS-only package; use require() in Babel config.

babel preset

✓ { "presets": ["babel-preset-kyt-core"] }

✗ { "presets": ["babel-preset-kyt-core", {}] }

No options needed; if you pass options, they override defaults.

Shows how to add the preset to a Babel configuration, with no additional options required.

// .babelrc { "presets": [ "babel-preset-kyt-core" ] } // or in package.json: "babel": { "presets": ["babel-preset-kyt-core"] }

Debug

Known issues

gotchaPreset is CJS-only; cannot be imported as ESM in Babel config with 'import' syntax.

fix

Use require() in .babelrc.js or babel.config.js: module.exports = { presets: [require('babel-preset-kyt-core')] };

affects: >=2.0.0

deprecatedPolyfill via @babel/polyfill is deprecated in favor of core-js and regenerator-runtime.

fix

The preset uses core-js automatically; ensure core-js is installed.

affects: >=2.0.0

gotchaPreset includes @babel/plugin-transform-runtime which can cause issues with instance methods if not configured properly.

fix

If using '@babel/runtime' with helpers, ensure '@babel/runtime' is installed as a dependency.

affects: >=1.0.0

breakingVersion 2.0.0 removed support for Node.js versions < 12.

fix

Use Node.js >= 12.

affects: >=2.0.0

gotchaThe preset sets 'useBuiltIns: usage' but does not automatically install core-js. Missing core-js causes runtime errors.

fix

Install core-js: npm install core-js

affects: >=2.0.0

deprecatedThe preset implicitly enables @babel/plugin-proposal-class-properties (legacy) – stage 4 proposals are now in @babel/preset-env.

fix

No action needed in v2, but consider migrating to latest @babel/preset-env.

affects: >=1.0.0

gotchaIf using TypeScript, the preset expects @babel/preset-typescript to be installed; not included transitively.

fix

Install @babel/preset-typescript as a devDependency.

affects: >=2.0.0

Errors

Common errors & fixes

Error: Cannot find module 'babel-preset-kyt-core'

The package is not installed or not in node_modules.

fix

Install the preset: npm install babel-preset-kyt-core --save-dev

ReferenceError: regeneratorRuntime is not defined

Missing regenerator-runtime when using async/await or generators.

fix

Install regenerator-runtime: npm install regenerator-runtime and add import 'regenerator-runtime/runtime' at entry.

Error: Plugin/Preset files are not allowed to export objects, only functions.

Babel config tries to import the preset as ESM but it is CJS.

fix

Use require() in Babel config: module.exports = { presets: [require('babel-preset-kyt-core')] };

Upgrade

Version history

2.0.1latest on npm

Audit

Dependencies

@babel/corerequiredpeer dependency for Babel transformation

@babel/preset-envrequiredcore transpilation preset

@babel/preset-reactrequiredReact JSX support

@babel/preset-typescriptoptionalTypeScript support

Agent activity

23 hits · last 30 days

node

OpenAI (training)

Resources

githubhttps://github.com/nytimes/kyt ↗

packagehttps://www.npmjs.com/package/babel-preset-kyt-core ↗