Add support for .env files

Author: colinrotherham

lib/nhsuk-prototype-kit.config.js

@@ -1,3 +1,4 @@
+import { existsSync } from 'node:fs'
 import { dirname, join, resolve } from 'node:path'
 import { cwd } from 'node:process'
 import { fileURLToPath } from 'node:url'
@@ -17,6 +18,11 @@ export const appPath = cwd()
 export const scriptPath =
   process.mainModule?.filename ?? join(appPath, 'app.js')
 
+/**
+ * Environment variables path
+ */
+export const envPath = join(dirname(scriptPath), '.env')
+
 /**
  * NHS prototype kit path
  */
@@ -75,3 +81,8 @@ export const searchPaths = [
   join(nhsukFrontendPath, 'dist'),
   ...modulePaths
 ]
+
+// Load environment variables (optional)
+if (existsSync(envPath)) {
+  process.loadEnvFile(envPath)
+}

lib/nodemon.config.js

@@ -2,6 +2,7 @@ import { join } from 'node:path'
 
 import {
   appPath,
+  envPath,
   scriptPath,
   prototypeKitPath
 } from './nhsuk-prototype-kit.config.js'
@@ -21,7 +22,7 @@ export default /** @satisfies {NodemonSettings} */ ({
   script: scriptPath,
   signal: 'SIGINT',
   spawn: true,
-  watch: [join(prototypeKitPath, 'lib'), scriptPath, appPath]
+  watch: [join(prototypeKitPath, 'lib'), envPath, scriptPath, appPath]
 })
 
 /**