iconify-json-nucleo

Note

This is an unofficial, community project. It is not affiliated with, authored by, or endorsed by Nucleo. The icons are a paid product and all rights to them belong to Nucleo. This repository ships only tooling and contains no icon data.

Features

• 🎨 Iconify-native: every family ships as IconifyJSON, the format every Iconify consumer understands.
• 🔑 License-gated: nothing licensed lives in this repo or in the published tarballs.
• 📦 Grouped by family: one prefix per family, with style and size in the icon name
• 🔗 Direct dependencies: the official Nucleo packages are real dependencies, not a scraped copy.
• ♻️ Reproducible codegen: renders the official Nucleo components to SVG and normalizes them with @iconify/tools.

🚀 Install

Set your NUCLEO_LICENSE_KEY, then install a family with your package manager.

export NUCLEO_LICENSE_KEY=your-license-key
npm install iconify-json-nucleo-core

For pnpm, Yarn, or Bun, use pnpm add, yarn add, or bun add instead. A postinstall renders the official Nucleo packages into icons.json and prints iconify-json-nucleo-core: built 512 icons for "nucleo-core". Every package needs Node.js 18 or newer.

Important

Current versions of npm, pnpm, Yarn, and Bun all block a dependency's postinstall script by default, so icons.json is not generated and importing the package fails. Use the table below to allow the postinstall script to run, or generate icons.json yourself with the codegen command.

Package manager	Allow the postinstall script
npm 12+	Run npm approve-scripts iconify-json-nucleo-core
pnpm 11+	Add iconify-json-nucleo-core: true under allowBuilds in pnpm-workspace.yaml, or run pnpm approve-builds
Yarn 4.14+	Add dependenciesMeta.iconify-json-nucleo-core.built: true to package.json
Bun	Add iconify-json-nucleo-core to trustedDependencies in package.json, or run bun pm trust iconify-json-nucleo-core

To generate icons.json without the postinstall, run the codegen directly:

npx iconify-json-nucleo-codegen build --base node_modules/iconify-json-nucleo-core

💻 Usage

Every package ships as both ESM and CommonJS with bundled TypeScript types, so no separate @types package is needed. Register a set once with any Iconify consumer.

// ESM
import { icons } from 'iconify-json-nucleo-core';
import { addCollection } from '@iconify/react';

addCollection(icons);

// CommonJS
const { addCollection } = require('@iconify/react');
const icons = require('iconify-json-nucleo-core');

addCollection(icons);

Then render icons by their prefix:name.

<Icon icon="nucleo-core:heart-outline-24" />

With @iconify/tailwind the JSON is read straight from node_modules.

<span class="icon-[nucleo-core--heart-outline-24]"></span>

Build tools that need the raw set can read it directly from the iconify-json-nucleo-core/icons.json subpath export.

🔐 License key

The official Nucleo packages read NUCLEO_LICENSE_KEY from the environment in their preinstall and validate it against nucleoapp.com before any data is installed. This layer adds no license logic of its own. It simply depends on those packages, so a missing or invalid key fails the install upstream.

# Locally
export NUCLEO_LICENSE_KEY=your-license-key

# CI or Vercel
# Expose NUCLEO_LICENSE_KEY as an environment variable to the install step.

🎨 Icons

One published package per family, one Iconify prefix per package.

Package	Prefix	Styles and sizes	Color
iconify-json-nucleo-core	nucleo-core	outline / fill, 24 / 32 / 48	monochrome
iconify-json-nucleo-ui	nucleo-ui	outline / fill / duo, 12 / 18	monochrome
iconify-json-nucleo-sharp	nucleo-sharp	24	monochrome
iconify-json-nucleo-micro-bold	nucleo-micro-bold	20	monochrome
iconify-json-nucleo-pixel	nucleo-pixel	24	monochrome
iconify-json-nucleo-flags	nucleo-flags	32	multicolor
iconify-json-nucleo-glass	nucleo-glass	24	multicolor
iconify-json-nucleo-isometric	nucleo-isometric	24	multicolor
iconify-json-nucleo-social-media	nucleo-social-media	32	multicolor
iconify-json-nucleo-credit-cards	nucleo-credit-cards	32	multicolor
iconify-json-nucleo-arcade	nucleo-arcade	30	multicolor

The families, prefixes, source packages, and color modes are declared once in manifest.ts. The styles and sizes above come from the upstream Nucleo packages.

Naming

Names come from the Nucleo React component names, so IconHeartOutline24 becomes heart-outline-24. A family's source packages merge into one prefix without collisions. The transform lives in naming.ts.

Colors

Monochrome families are normalized to currentColor so they inherit text color, and multicolor families keep their literal colors. The mode is set per family in the manifest.

🛠️ Development

bun install            # install the codegen and dev tooling
bun run lint           # type-checked ESLint
bun run typecheck      # type-check with tsc
bun run build:codegen  # build the codegen package
bun test               # run the pipeline tests

No license is needed to develop. bun install resolves only the codegen and dev tooling, and the tests run against fixtures that mimic the official Nucleo packages.

How it fits together

• packages/codegen renders the official React components, normalizes each SVG with @iconify/tools, and emits icons.json. It ships a programmatic API and a CLI.
• packages/families/* is one thin wrapper per family that runs the codegen in a postinstall and re-exports the generated set as ESM and CommonJS.
• scripts/sync-families.ts regenerates every family from the manifest, and CI runs sync:check to keep the committed files in sync.

Each family's postinstall.mjs is plain Node ESM, since it runs on the consumer's machine during install where only Node is guaranteed.

Adding or changing a family

1. Edit the manifest in manifest.ts.
2. Run bun run sync to regenerate and format the family packages.
3. Commit with a Conventional Commit message.

Releasing

Cut a release with bun run release. It bumps the version, syncs the families, then commits, tags, and pushes. The tag triggers the Release workflow, which creates the GitHub Release from the Conventional Commits since the last tag and publishes the codegen and family packages to npm with provenance.

⚖️ License

The tooling and wrapper code in this repository is MIT licensed.

That license covers the code only. It grants no rights to Nucleo icons, which are a paid product owned by Nucleo and governed by the Nucleo license. This repository contains no Nucleo icon data and must not be used to redistribute Nucleo assets. Generating and using the icons requires your own valid Nucleo license.