For some reason just using datasette
when in the venv described at https://docs.datasette.io/en/0.62/contributing.html didn't work, so use this instead
./venv/bin/datasette --reload -p 8002 fixtures.db
Full command to build the codemirror bundle and re-run:
node_modules/.bin/rollup datasette/static/cm-editor-6.0.1.js -f iife -n cm -o datasette/static/cm-editor-6.0.1.bundle.js -p @rollup/plugin-node-resolve -p @rollup/plugin-terser && ./venv/bin/datasette --reload -p 8002 fixtures.db