feat: setup better-auth

packages/auth/eslint.config.js

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+import baseConfig from "@kan/eslint-config/base";
+
+/** @type {import('typescript-eslint').Config} */
+export default [
+  {
+    ignores: [],
+  },
+  ...baseConfig,
+];

packages/auth/package.json

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+{
+  "name": "@kan/auth",
+  "private": true,
+  "version": "0.1.0",
+  "type": "module",
+  "exports": {
+    ".": "./src/index.ts"
+  },
+  "license": "MIT",
+  "scripts": {
+    "build": "tsc",
+    "clean": "git clean -xdf .cache .turbo dist node_modules",
+    "dev": "tsc",
+    "format": "prettier --check . --ignore-path ../../.gitignore",
+    "lint": "eslint",
+    "typecheck": "tsc --noEmit --emitDeclarationOnly false"
+  },
+  "devDependencies": {
+    "@kan/db": "workspace:*",
+    "@kan/eslint-config": "workspace:*",
+    "@kan/prettier-config": "workspace:*",
+    "@kan/shared": "workspace:*",
+    "@kan/tsconfig": "workspace:*",
+    "eslint": "catalog:",
+    "prettier": "catalog:",
+    "typescript": "catalog:"
+  },
+  "prettier": "@kan/prettier-config",
+  "dependencies": {
+    "better-auth": "^1.2.7"
+  }
+}

packages/auth/src/auth.ts

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+import { betterAuth } from "better-auth";
+import { drizzleAdapter } from "better-auth/adapters/drizzle";
+import { apiKey } from "better-auth/plugins";
+import { magicLink } from "better-auth/plugins/magic-link";
+
+import { createDrizzleClient } from "@kan/db/client";
+import * as schema from "@kan/db/schema";
+
+const db = createDrizzleClient();
+
+console.log("GOOGLE_CLIENT_ID", process.env.GOOGLE_CLIENT_ID);
+console.log("GOOGLE_CLIENT_SECRET", process.env.GOOGLE_CLIENT_SECRET);
+
+export const auth = betterAuth({
+  database: drizzleAdapter(db, {
+    provider: "pg",
+    schema: {
+      ...schema,
+      user: schema.users,
+    },
+  }),
+  socialProviders: {
+    google: {
+      clientId: process.env.GOOGLE_CLIENT_ID!,
+      clientSecret: process.env.GOOGLE_CLIENT_SECRET!,
+    },
+  },
+  user: {
+    additionalFields: {
+      stripeCustomerId: {
+        type: "string",
+        required: false,
+        defaultValue: null,
+        input: false,
+      },
+    },
+  },
+  plugins: [
+    apiKey(),
+    magicLink({
+      sendMagicLink: async ({ email, token, url }, request) => {
+        // send email to user
+      },
+    }),
+  ],
+  advanced: {
+    cookiePrefix: "kan",
+    database: {
+      generateId: false,
+    },
+  },
+});

packages/auth/src/clients.ts

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+import { createAuthClient } from "better-auth/react";
+
+export const authClient = createAuthClient();

packages/auth/src/index.ts

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+import { auth } from "./auth";
+import { authClient } from "./clients";
+
+export const name = "auth";
+
+export { auth, authClient };

packages/auth/tsconfig.json

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+{
+  "extends": "@kan/tsconfig/internal-package.json",
+  "compilerOptions": {},
+  "include": ["*.ts", "src"],
+  "exclude": ["node_modules"]
+}