Changes in the popular npm packages module formats between Nov 2023 to Feb 2024

log.txt

Map(5) {
  'cjs' => Map(3) {
    'esm' => Set(34) {
      'mime',
      'eslint-plugin-jsdoc',
      '@salesforce/sf-plugins-core',
      'stylelint-prettier',
      '@ckeditor/ckeditor5-core',
      '@ckeditor/ckeditor5-upload',
      '@ckeditor/ckeditor5-typing',
      '@ckeditor/ckeditor5-paragraph',
      '@ckeditor/ckeditor5-basic-styles',
      '@ckeditor/ckeditor5-essentials',
      '@ckeditor/ckeditor5-list',
      '@ckeditor/ckeditor5-link',
      '@ckeditor/ckeditor5-heading',
      '@ckeditor/ckeditor5-table',
      '@ckeditor/ckeditor5-image',
      '@ckeditor/ckeditor5-indent',
      '@ckeditor/ckeditor5-block-quote',
      '@ckeditor/ckeditor5-paste-from-office',
      '@ckeditor/ckeditor5-autoformat',
      '@ckeditor/ckeditor5-editor-classic',
      '@ckeditor/ckeditor5-media-embed',
      '@ckeditor/ckeditor5-easy-image',
      '@ckeditor/ckeditor5-cloud-services',
      '@ckeditor/ckeditor5-adapter-ckfinder',
      '@ckeditor/ckeditor5-ckfinder',
      '@ckeditor/ckeditor5-alignment',
      '@ckeditor/ckeditor5-font',
      '@ckeditor/ckeditor5-remove-format',
      '@ckeditor/ckeditor5-horizontal-line',
      '@ckeditor/ckeditor5-code-block',
      '@ckeditor/ckeditor5-special-characters',
      '@ckeditor/ckeditor5-highlight',
      '@ckeditor/ckeditor5-word-count',
      'f2elint'
    },
    'dual' => Set(16) {
      '@sinonjs/commons',
      '@sinclair/typebox',
      'buffer-crc32',
      'mdurl',
      'linkify-it',
      'uc.micro',
      'markdown-it',
      'change-case-all',
      'stylelint',
      '@commitlint/config-conventional',
      '@prisma/client',
      'promise-call-limit',
      'markdown-it-emoji',
      'stylelint-config-css-modules',
      'markdown-it-container',
      'markdown-it-footnote'
    },
    'faux' => Set(3) { 'clipanion', 'pretty-quick', '@storybook/addon-console' }
  },
  'faux' => Map(2) {
    'dual' => Set(17) {
      'date-fns',
      '@testing-library/user-event',
      '@vue/compiler-sfc',
      '@vue/shared',
      '@vue/compiler-core',
      '@vue/compiler-dom',
      '@vue/reactivity',
      '@vue/server-renderer',
      '@vue/runtime-core',
      '@vue/runtime-dom',
      'react-icons',
      '@firebase/auth',
      'universal-cookie',
      '@stripe/stripe-js',
      'echarts',
      'react-cookie',
      '@loadable/component'
    },
    'esm' => Set(13) {
      'clsx',
      'redux',
      'react-redux',
      'reselect',
      'redux-thunk',
      '@reduxjs/toolkit',
      'xstate',
      '@changesets/types',
      'shiki',
      '@changesets/cli',
      'jsondiffpatch',
      'redux-observable',
      '@changesets/changelog-github'
    }
  },
  undefined => Map(4) {
    'cjs' => Set(204) {
      'es-errors',
      'lainan',
      'es-define-property',
      'ip-address',
      '@rollup/rollup-linux-x64-gnu',
      '@rollup/rollup-linux-x64-musl',
      '@dataform/core',
      'bare-events',
      '@stdlib/assert-is-string',
      '@prisma/debug',
      '@rollup/rollup-win32-x64-msvc',
      '@stdlib/string-base-lowercase',
      'tarjan-graph',
      '@types/methods',
      '@stdlib/number-ctor',
      '@sigstore/verify',
      '@types/stylis',
      '@prisma/get-platform',
      '@parcel/watcher-linux-x64-glibc',
      '@fastify/fast-json-stringify-compiler',
      '@prisma/fetch-engine',
      '@stdlib/assert-is-number',
      '@sigstore/core',
      '@esbuild/aix-ppc64',
      'wait-port',
      '@expo/json-file',
      '@opentelemetry/instrumentation-http',
      '@react-native/codegen',
      'postgres-range',
      'jsc-safe-url',
      '@microsoft/tsdoc-config',
      '@rushstack/rig-package',
      '@react-native/virtualized-lists',
      'pg-numeric',
      'native-duplexpair',
      'typanion',
      'async-sema',
      '@volar/language-core',
      'async-listen',
      '@stdlib/assert-has-float64array-support',
      '@stdlib/assert-is-float64array',
      '@parcel/watcher-linux-x64-musl',
      '@material/theme',
      '@stdlib/array-float32',
      '@stdlib/assert-has-float32array-support',
      '@stdlib/assert-is-float32array',
      '@volar/typescript',
      'toastify-react-native',
      '@opentelemetry/instrumentation-grpc',
      '@react-native/js-polyfills',
      '@material/feature-targeting',
      '@stdlib/complex-float32',
      '@stdlib/number-float64-base-to-float32',
      '@material/rtl',
      'stream-json',
      '@opentelemetry/sdk-node',
      'flow-enums-runtime',
      'muggle-string',
      '@mapbox/vector-tile',
      '@react-native/assets-registry',
      '@octokit/auth-app',
      '@stdlib/complex-reimf',
      '@stdlib/complex-reim',
      '@stdlib/complex-float64',
      'matcher-collection',
      '@react-native/gradle-plugin',
      'babel-plugin-transform-flow-enums',
      '@stdlib/math-base-napi-unary',
      '@angular-eslint/builder',
      '@stdlib/boolean-ctor',
      'vt-pbf',
      'stream-chain',
      '@actions/github',
      '@nx/linter',
      '@mapbox/geojson-rewind',
      'eventid',
      '@types/btoa-lite',
      '@rollup/rollup-darwin-arm64',
      'ansi-red',
      'vinyl-sourcemaps-apply',
      '@types/throttle-debounce',
      'speed-measure-webpack-plugin',
      'blakejs',
      'postinstall-postinstall',
      '@types/passport-jwt',
      'react-grid-layout',
      '@types/jest-axe',
      'libsodium-wrappers',
      'randomstring',
      'expo-modules-core',
      '@types/better-sqlite3',
      '@cypress/code-coverage',
      'dagre',
      '@stdlib/fs-read-file',
      'eslint-plugin-tailwindcss',
      '@fontsource/roboto',
      '@tailwindcss/aspect-ratio',
      'jest-environment-enzyme',
      'websocket-stream',
      'url-polyfill',
      ... 104 more items
    },
    'faux' => Set(54) {
      '@smithy/core',
      'mdns-listener-advanced',
      '@sentry-internal/feedback',
      '@microsoft/tsdoc',
      '@opentelemetry/otlp-proto-exporter-base',
      '@opentelemetry/exporter-trace-otlp-proto',
      '@sentry-internal/replay-canvas',
      '@azure/core-http-compat',
      '@octokit/oauth-methods',
      '@js-joda/core',
      '@octokit/oauth-authorization-url',
      '@react-aria/interactions',
      '@aws-sdk/lib-storage',
      '@react-stately/utils',
      '@aws-sdk/client-cloudformation',
      '@dnd-kit/sortable',
      '@firebase/installations-compat',
      '@octokit/auth-oauth-app',
      '@material/base',
      '@material/animation',
      '@aws-sdk/client-iam',
      '@azure/keyvault-keys',
      'geojson-vt',
      '@material/dom',
      '@internationalized/date',
      '@aws-sdk/client-sfn',
      '@mapbox/whoots-js',
      '@material/ripple',
      'ulid',
      '@ethersproject/transactions',
      'react-infinite-scroll-component',
      'recoil',
      'focus-visible',
      'await-to-js',
      'turndown',
      '@expo/vector-icons',
      'eslint-plugin-vitest',
      '@mui/styled-engine-sc',
      'countup.js',
      '@supabase/supabase-js',
      'typedi',
      'eslint-plugin-mdx',
      'react-native-paper',
      'reconnecting-websocket',
      'deepcopy',
      'rc-form',
      'yaml-front-matter',
      '@antv/g6',
      'jsencrypt',
      '@uniswap/sdk-core',
      'rollup-plugin-gzip',
      '@zerollup/ts-transform-paths',
      'rax-text',
      'rax-view'
    },
    'dual' => Set(51) {
      'libsql-stateless',
      'libsql-stateless-easy',
      'citty',
      'ohash',
      'nypm',
      '@vitejs/plugin-basic-ssl',
      '@tanstack/virtual-core',
      'get-port-please',
      'cross-inspect',
      '@tanstack/react-virtual',
      '@tanstack/react-query-devtools',
      'safe-identifier',
      'eslint-compat-utils',
      'goober',
      '@cucumber/tag-expressions',
      '@urql/core',
      'peberminta',
      '@inquirer/core',
      '@csstools/cascade-layer-name-parser',
      '@vueuse/metadata',
      '@radix-ui/react-tabs',
      'i18next-http-backend',
      '@radix-ui/react-accordion',
      '@antfu/utils',
      'react-hot-toast',
      'react-pdf',
      '@swc-node/register',
      '@tiptap/core',
      '@radix-ui/react-switch',
      '@tiptap/pm',
      '@radix-ui/react-radio-group',
      '@radix-ui/react-label',
      '@fullcalendar/daygrid',
      '@tiptap/extension-link',
      '@tiptap/starter-kit',
      'geckodriver',
      '@storybook/test',
      '@nuxt/devtools',
      '@chakra-ui/icons',
      '@inquirer/prompts',
      '@vitejs/plugin-vue2',
      'markdown-it-sup',
      '@storybook/vue3-vite',
      '@clack/prompts',
      '@uiw/react-md-editor',
      '@iconify/json',
      '@storybook/web-components',
      'vue-types',
      'tsm',
      'vite-plugin-lib-inject-css',
      '@xylabs/ts-scripts-yarn3'
    },
    'esm' => Set(50) {
      '@pkgr/core',
      'get-east-asian-width',
      'unicorn-magic',
      'mdast-util-mdxjs-esm',
      '@sindresorhus/merge-streams',
      'stdin-discarder',
      '@floating-ui/react',
      'devlop',
      'micromark-extension-mdx-expression',
      'micromark-extension-mdx-jsx',
      'micromark-extension-mdxjs-esm',
      'mdast-util-mdx',
      'micromark-extension-mdx-md',
      'micromark-extension-mdxjs',
      'estree-util-visit',
      'git-hooks-list',
      'unist-util-position-from-estree',
      'micromark-factory-mdx-expression',
      'micromark-util-events-to-acorn',
      '@lit-labs/ssr-dom-shim',
      '@codemirror/view',
      '@codemirror/language',
      '@noble/curves',
      'digest-fetch',
      '@codemirror/state',
      'is-url-superb',
      'hast-util-is-element',
      'hook-std',
      'prosemirror-transform',
      'prosemirror-commands',
      'jotai',
      'file-url',
      '@ckeditor/ckeditor5-ui',
      'filemanager-webpack-plugin',
      'root-check',
      'ng-zorro-antd',
      'typedoc-plugin-missing-exports',
      'random-words',
      '@esm-bundle/chai',
      '@ckeditor/ckeditor5-html-support',
      '@backstage/core-plugin-api',
      '@ckeditor/ckeditor5-mention',
      '@ckeditor/ckeditor5-page-break',
      'ts-standard',
      'semantic-release-monorepo',
      '@ckeditor/ckeditor5-html-embed',
      '@backstage/test-utils',
      'renamer',
      '@web/dev-server-storybook',
      'alfy'
    }
  },
  'dual' => Map(1) { 'esm' => Set(1) { 'chai' } },
  'esm' => Map(1) {
    'dual' => Set(2) { '@tanstack/table-core', '@tanstack/react-table' }
  }
}

mod.js

/**
 * @typedef {'esm' | 'dual' | 'faux' | 'cjs'} Kind
 */

import fs from 'node:fs/promises'

const fromUrl = new URL('data/2023-11-22.json', import.meta.url)
const toUrl = new URL('data/2024-02-20.json', import.meta.url)
const from = JSON.parse(await fs.readFile(fromUrl, 'utf8'))
const to = JSON.parse(await fs.readFile(toUrl, 'utf8'))

/** @type {Map<Kind | undefined, Map<Kind, Set<string>>>} */
const changes = new Map()

for (const [
  /** @type {string} */ name,
  /** @type {Kind} */ now
] of Object.entries(to)) {
  /** @type {Kind | undefined} */
  const before = from[name] || undefined
  if (before === now) continue
  let to = changes.get(before)
  if (!to) changes.set(before, (to = new Map()))
  let set = to.get(now)
  if (!set) to.set(now, (set = new Set()))
  set.add(name)
}

console.log(changes)