feat(cli): load .env files

Valid env files include:

  .env.tusken
  .env.${NODE_ENV}
  .env

The order they are listed is the precedence.

packages/tusken-cli/package.json

@@ -35,6 +35,7 @@
   "dependencies": {
     "@tusken/schema": "1.0.0-alpha.5",
     "chokidar": "^3.5.3",
+    "dotenv": "^16.0.2",
     "jiti": "^1.14.0"
   },
   "peerDependencies": {

packages/tusken-cli/src/config.ts

@@ -3,16 +3,16 @@ import type { ClientConfig } from 'pg'
 import type { Config } from 'tusken/config'
 import escalade from './escalade/sync'
 
-const defaultConnection = {
+const getDefaultConnection = () => ({
   host: process.env.PGHOST || 'localhost',
   port: +(process.env.PGPORT || 5432),
   user: process.env.PGUSER,
   password: process.env.PGPASSWORD,
   database: process.env.PGDATABASE || 'main',
-}
+})
 
 export type LoadedConfig = Config & {
-  connection: ClientConfig & typeof defaultConnection
+  connection: ClientConfig & ReturnType<typeof getDefaultConnection>
   schemaDir: string
   dataDir: string
   tuskenId: string
@@ -29,6 +29,8 @@ export function loadConfig(configPath?: string, database?: string) {
     }
   })
 
+  const defaultConnection = getDefaultConnection()
+
   if (configPath) {
     const jiti = require('jiti') as typeof import('jiti').default
     const load = jiti(__filename, { interopDefault: true, esmResolve: true })
@@ -44,7 +46,7 @@ export function loadConfig(configPath?: string, database?: string) {
   }
 
   config ||= {
-    connection: { ...defaultConnection },
+    connection: defaultConnection,
   }
 
   assertType<LoadedConfig>(config)

packages/tusken-cli/src/dotenv.ts

@@ -0,0 +1,21 @@
+import { config as loadDotEnv } from 'dotenv'
+import escalade from './escalade/sync'
+
+export function dotenv() {
+  const envFiles = [
+    '.env.tusken',
+    '.env.' + (process.env.NODE_ENV || 'development'),
+    '.env',
+  ]
+
+  const envPath = escalade(process.cwd(), (dir, files) => {
+    const file = envFiles.find(f => files.includes(f))
+    if (file) {
+      return file
+    }
+  })
+
+  loadDotEnv({
+    path: envPath,
+  })
+}

packages/tusken-cli/src/index.ts

@@ -11,7 +11,8 @@ import { Client } from 'pg'
 import { loadConfig } from './config'
 import { debounce } from './debounce'
 import { defer, Deferred } from './defer'
-import { firstLine } from './firstline/index'
+import { dotenv } from './dotenv'
+import { firstLine } from './firstline'
 
 export default async function () {
   const tusken = cac('tusken')
@@ -239,6 +240,7 @@ export default async function () {
 
   tusken.help()
   try {
+    dotenv()
     tusken.parse(process.argv, { run: false })
     await tusken.runMatchedCommand()
   } catch (e: any) {