fix(supabase): resolve jsDelivr CDN ESM import failure with .js extensions

[mandarini]

Summary

Fixes jsDelivr CDN imports failing with Cannot read properties of null (reading 'AuthClient') since v2.86.1.

Problem

When jsDelivr bundles the CJS main build, it transforms require('@supabase/auth-js') to default imports. Since auth-js has export default null (added by Rollup for packages without default exports), destructuring fails.

Solution

1. Changed wrapper to import from ESM module build instead of CJS main build
2. Added post-build script to add .js extensions to relative imports in the module build

This fixes both:

• jsDelivr CDN imports
• Node.js direct ESM imports (.js extensions satisfy Node.js requirements)

Changes

• wrapper.mjs - Import from ../module/index.js instead of ../main/index.js (thanks @7ttp)
• scripts/fix-esm-extensions.cjs - Adds .js extensions to compiled ESM imports

Related

• Fixes Vite dev regression after #1914: exports is not defined from CJS wrapper in @supabase/supabase-js@^2.86.0 #1942
• Alternative to fix(supabase): use esm module build in wrapper to fix browser compatibility #1943 (which only fixed jsDelivr but broke Node.js ESM)

[juliangorge]

Hey, i'm still having problems after this fix

[jim-spr]

Same here @mandarini

[mandarini]

Can you please check again with latest? 2.87.3? The cached results should be gone by now. @juliangorge @jim-spr

[juliangorge]

Good morning @mandarini
I've cleaned my lock files and try to build my next project and I have:

./node_modules/@supabase/supabase-js/dist/esm/wrapper.mjs
Attempted import error: '../module/index.js' does not contain a default export (imported as 'index').

Import trace for requested module:
./node_modules/@supabase/supabase-js/dist/esm/wrapper.mjs
./node_modules/@supabase/ssr/dist/module/createBrowserClient.js
./node_modules/@supabase/ssr/dist/module/index.js