diff --git a/.github/workflows/upstream-digest.yml b/.github/workflows/upstream-digest.yaml
similarity index 98%
rename from .github/workflows/upstream-digest.yml
rename to .github/workflows/upstream-digest.yaml
index 2ebfc22..17020d4 100644
--- a/.github/workflows/upstream-digest.yml
+++ b/.github/workflows/upstream-digest.yaml
@@ -2,7 +2,7 @@ name: upstream digest
 
 on:
   schedule:
-    - cron: "0 9 * * 1"
+    - cron: '0 9 * * 1'
   workflow_dispatch:
 
 permissions:
diff --git a/.luarc.json b/.luarc.json
index c0448ca..78a7d8a 100644
--- a/.luarc.json
+++ b/.luarc.json
@@ -4,7 +4,8 @@
     "pathStrict": true
   },
   "workspace": {
-    "checkThirdParty": false
+    "checkThirdParty": false,
+    "ignoreDir": [".direnv"]
   },
   "type": {
     "checkTableShape": true
diff --git a/.styluaignore b/.styluaignore
new file mode 100644
index 0000000..9b42106
--- /dev/null
+++ b/.styluaignore
@@ -0,0 +1 @@
+.direnv/
diff --git a/README.md b/README.md
index 02e14d7..771c6a7 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,8 @@ A refined [oil.nvim](https://github.com/stevearc/oil.nvim) — edit your
 filesystem like a buffer, with bug fixes and community PRs that haven't landed
 upstream.
 
-[Upstream tracker](doc/upstream.md) — full PR and issue triage against [oil.nvim](https://github.com/stevearc/oil.nvim)
+[Upstream tracker](doc/upstream.md) — full PR and issue triage against
+[oil.nvim](https://github.com/stevearc/oil.nvim)
 
 https://user-images.githubusercontent.com/506791/209727111-6b4a11f4-634a-4efa-9461-80e9717cea94.mp4
 
diff --git a/scripts/ci.sh b/scripts/ci.sh
new file mode 100755
index 0000000..3e9356d
--- /dev/null
+++ b/scripts/ci.sh
@@ -0,0 +1,7 @@
+#!/bin/sh
+set -eu
+
+nix develop --command stylua --check lua spec
+git ls-files '*.lua' | xargs nix develop --command selene --display-style quiet
+nix develop --command prettier --check .
+nix develop --command busted