tools: Fix prep-dev-environment script.

.gitignore

@@ -139,4 +139,8 @@ dmypy.json
 # Exclusions
 
 !src/xkcd_pass/lib/
-!tools/lib
+!tools/lib
+
+#node_modules
+
+node_modules/

package.json

@@ -0,0 +1,26 @@
+{
+  "name": "prettier",
+  "version": "2.5.1",
+  "description": "[![code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black) [![mypy coverage](https://img.shields.io/badge/mypy-100%25-green.svg)](https://github.com/python/mypy)",
+  "main": "index.js",
+  "directories": {
+    "doc": "docs"
+  },
+  "dependencies": {
+    "prettier": "^2.5.1"
+  },
+  "devDependencies": {},
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/adambirds/xkcd-password-gen.git"
+  },
+  "author": "",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://github.com/adambirds/xkcd-password-gen/issues"
+  },
+  "homepage": "https://github.com/adambirds/xkcd-password-gen#readme"
+}

tools/setup/prep-dev-environment

@@ -1,10 +1,15 @@
 #!/usr/bin/env bash
 set -eu
 
+apt install npm -y
 python3 -m venv xkcd-pass-venv
 if [ -d xkcd-pass-venv/bin ]; then
 	source xkcd-pass-venv/bin/activate
 fi
+cd "$(dirname "$0")"
+pip3 install build
+pip3 install wheel
 pip3 install -r ../../requirements.txt
 ./install-shellcheck
 ./install-shfmt
+npm install