Build dist/prism.js as IIFE for synchronous globalThis.Prism - #4087
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…is.Prism The previous prism.global.js used a dynamic import() to load index.js, which made globalThis.Prism available only asynchronously — breaking backward compatibility with v1 where Prism was available immediately after the <script> tag. Replace prism.global.js with an IIFE build target that bundles auto-start.js (core + autoloader) into a single file. Rollup's `name: 'Prism'` option assigns the default export to `var Prism`, making it synchronously available as a global. Languages are still loaded dynamically by the autoloader. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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ESM plugins import the Prism singleton from global.js. When the IIFE build has already set globalThis.Prism, global.js now reuses that instance instead of creating a second one. This ensures plugins loaded via <script type="module"> register on the same Prism instance as the one exposed by <script src="dist/prism.js">. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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LGTM, only concern is that this will cause trouble if v1 Prism and v2 Prism co-exist in the same page. But if you do that, you'll probably have more issues anyway.
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Summary
prism.global.jsusedimport()to dynamically loadindex.js, makingglobalThis.Prismavailable only asynchronously — breaking backward compatibility with v1 wherePrismwas available immediately after the<script>tagauto-start.js(core + autoloader) into a single self-contained file (~20KB)name: 'Prism'assigns the default export tovar Prism, making it synchronously available as a globalimport()global.jsnow bridges the IIFE and ESM singletons: whenglobalThis.Prismis already a Prism instance (set by the IIFE), ESM plugins reuse it instead of creating a second oneLive demo: https://codepen.io/dmitrysharabin/pen/xbbdXZb
Test plan
dist/prism.jsvia<script>and verifyglobalThis.Prismis defined synchronously in the next<script>block<code class="language-javascript">)import Prism from 'prismjs') and CJS (require('prismjs')) still workwindow.Prism = { manual: true }) is still read correctlyline-numbers,inline-color,show-invisibles) loaded via<script type="module">work alongside the IIFE buildglobalThis.Prismstaysundefined, ESM/CJS return a fresh instance🤖 Generated with Claude Code