bun run: error: Script not found "dev"

error: Script not found "dev" means bun run dev found no dev entry in the scripts of the nearest package.json, and no file named dev to execute. Run bun run with no arguments to list the scripts that exist, then either use the correct name or add a "dev" script to package.json.

Reproduce it

cat > package.json <<'EOF'
{ "name": "app", "scripts": { "build": "echo building" } }
EOF
npx --yes bun@1 run dev

error: Script not found "dev"

Fix

Add the script, or call the one that exists:

cat > package.json <<'EOF'
{ "name": "app", "scripts": { "build": "echo building", "dev": "echo dev server" } }
EOF
npx --yes bun@1 run dev

$ echo dev server
dev server

How bun run resolves its argument

bun dev (without run) also runs the script, but a Bun built-in command with the same name (test, build, install) wins: use bun run test to run a test script instead of Bun's test runner. In a workspace, bun run --filter 'pkg-name' dev runs the script in the matching packages.