fix: load env before auth schema config

src/module/schema.ts

@@ -73,7 +73,7 @@ async function loadAuthOptions(context: SchemaContext) {
       .filter(([, value]) => typeof value === 'string')
       .map(([key, value]) => [key, value as string]),
   )
-  const userConfig = await loadUserAuthConfig(configFile, isProduction, alias, context.nuxt.options.runtimeConfig)
+  const userConfig = await loadUserAuthConfig(configFile, isProduction, alias, context.nuxt.options.runtimeConfig, context.nuxt.options.rootDir)
 
   const extendedConfig: { plugins?: BetterAuthPlugin[] } = {}
   await context.nuxt.callHook('better-auth:config:extend', extendedConfig)

src/schema-generator.ts

@@ -1,7 +1,9 @@
 import type { BetterAuthOptions } from 'better-auth'
 import type { Casing } from 'drizzle-orm/utils'
+import { existsSync } from 'node:fs'
 import { generateDrizzleSchema as _generateDrizzleSchema } from '@better-auth/cli/api'
 import { consola } from 'consola'
+import { join } from 'pathe'
 
 export interface SchemaOptions { usePlural?: boolean, useUuid?: boolean, casing?: Casing }
 
@@ -59,6 +61,17 @@ interface SchemaGeneratorGlobals {
   defineServerAuth?: RuntimeDefineServerAuthFn
 }
 
+function loadLocalEnv(rootDir?: string): void {
+  if (!rootDir)
+    return
+
+  const envPath = join(rootDir, '.env.local')
+  if (!existsSync(envPath))
+    return
+
+  process.loadEnvFile(envPath)
+}
+
 declare global {
   // eslint-disable-next-line vars-on-top
   var __nuxtBetterAuthDefineServerAuth: RuntimeDefineServerAuthFn | undefined
@@ -69,6 +82,7 @@ export async function loadUserAuthConfig(
   throwOnError = false,
   alias?: Record<string, string>,
   runtimeConfig: unknown = {},
+  rootDir?: string,
 ): Promise<Partial<BetterAuthOptions>> {
   const { createJiti } = await import('jiti')
   const { defineServerAuth: runtimeDefineServerAuth } = await import('./runtime/config')
@@ -85,6 +99,7 @@ export async function loadUserAuthConfig(
   schemaGlobals.__nuxtBetterAuthDefineServerAuth!._count++
 
   try {
+    loadLocalEnv(rootDir)
     const mod = await jiti.import(configPath) as { default?: unknown }
     const configFn = mod.default
     if (typeof configFn === 'function') {

test/schema-generator.test.ts

@@ -160,6 +160,30 @@ describe('loadUserAuthConfig', () => {
 
     expect(result).toEqual({ appName: '/auth/sign-up' })
   })
+
+  it('loads .env.local before importing auth config dependencies', async () => {
+    const envPath = join(TEST_DIR, '.env.local')
+    const helperPath = join(TEST_DIR, 'env-helper.ts')
+    const configPath = join(TEST_DIR, 'env-config.ts')
+    const originalApiKey = process.env.RESEND_API_KEY
+    delete process.env.RESEND_API_KEY
+
+    try {
+      writeFileSync(envPath, 'RESEND_API_KEY=re_test_fixture\n')
+      writeFileSync(helperPath, `if (!process.env.RESEND_API_KEY)\n  throw new Error('Missing API key. Pass it to the constructor new Resend("re_123")')\n\nexport function getPlugins() { return [] }\n`)
+      writeFileSync(configPath, `import { getPlugins } from './env-helper'\nexport default defineServerAuth({ plugins: getPlugins() })`)
+
+      const result = await loadUserAuthConfig(configPath, true, undefined, {}, TEST_DIR)
+
+      expect(result).toEqual({ plugins: [] })
+    }
+    finally {
+      if (originalApiKey === undefined)
+        delete process.env.RESEND_API_KEY
+      else
+        process.env.RESEND_API_KEY = originalApiKey
+    }
+  })
 })
 
 describe('defineServerAuth', () => {