A quick repo to show the issue with react-spectrum and vite-ssr
pnpm install
pnpm dev then navigate to http://localhost:3000/
error message that it gives is
Error: ERR_UNKNOWN_FILE_EXTENSION .css /home/stuart/tmp/vite-ssr-example/node_modules/.pnpm/@react-spectrum+actiongroup@3.8.2_@react-spectrum+provider@3.7.1_react-dom@18.2.0_react@18.2.0/node_modules/@react-spectrum/actiongroup/dist/main.css
at defaultGetFormat (/home/stuart/tmp/vite-ssr-example/node_modules/.pnpm/ts-node@10.9.1_@types+node@18.15.11_typescript@4.9.5/node_modules/ts-node/dist-raw/node-internal-modules-esm-get_format.js:93:15)
at defer (/home/stuart/tmp/vite-ssr-example/node_modules/.pnpm/ts-node@10.9.1_@types+node@18.15.11_typescript@4.9.5/node_modules/ts-node/src/esm.ts:296:7)
at entrypointFallback (/home/stuart/tmp/vite-ssr-example/node_modules/.pnpm/ts-node@10.9.1_@types+node@18.15.11_typescript@4.9.5/node_modules/ts-node/src/esm.ts:304:22)
at getFormat (/home/stuart/tmp/vite-ssr-example/node_modules/.pnpm/ts-node@10.9.1_@types+node@18.15.11_typescript@4.9.5/node_modules/ts-node/src/esm.ts:338:26)
at /home/stuart/tmp/vite-ssr-example/node_modules/.pnpm/ts-node@10.9.1_@types+node@18.15.11_typescript@4.9.5/node_modules/ts-node/src/esm.ts:245:17
at addShortCircuitFlag (/home/stuart/tmp/vite-ssr-example/node_modules/.pnpm/ts-node@10.9.1_@types+node@18.15.11_typescript@4.9.5/node_modules/ts-node/src/esm.ts:409:21)
at load (/home/stuart/tmp/vite-ssr-example/node_modules/.pnpm/ts-node@10.9.1_@types+node@18.15.11_typescript@4.9.5/node_modules/ts-node/src/esm.ts:239:12)
at load (/home/stuart/tmp/vite-ssr-example/node_modules/.pnpm/ts-node@10.9.1_@types+node@18.15.11_typescript@4.9.5/node_modules/ts-node/src/child/child-loader.ts:18:36)
at nextLoad (node:internal/modules/esm/loader:163:28)
at ESMLoader.load (node:internal/modules/esm/loader:605:26)