feat(account): add option to allow unlinking all accounts (#1818)

docs/content/docs/reference/options.mdx

@@ -316,7 +316,15 @@ export const auth = betterAuth({
 
 - `modelName`: The model name for the account
 - `fields`: Map fields to different column names
-- `accountLinking`: Configuration for account linking
+
+### `accountLinking`
+
+Configuration for account linking.
+
+- `enabled`: Enable account linking (default: `false`)
+- `trustedProviders`: List of trusted providers
+- `allowDifferentEmails`: Allow users to link accounts with different email addresses
+- `allowUnlinkingAll`: Allow users to unlink all accounts
 
 ## `verification`
 

packages/better-auth/src/api/routes/account.test.ts

@@ -59,6 +59,8 @@ describe("account", async () => {
 		},
 	});
 
+	const ctx = await auth.$context;
+
 	const { headers } = await signInWithTestUser();
 
 	it("should list all accounts", async () => {
@@ -198,6 +200,15 @@ describe("account", async () => {
 				headers,
 			},
 		});
+		await ctx.adapter.delete({
+			model: "account",
+			where: [
+				{
+					field: "providerId",
+					value: "google",
+				},
+			],
+		});
 		const unlinkAccountId = previousAccounts.data![0].accountId;
 		const unlinkRes = await client.unlinkAccount({
 			providerId: "credential",

packages/better-auth/src/api/routes/account.ts

@@ -184,17 +184,14 @@ export const unlinkAccount = createAuthEndpoint(
 				message: BASE_ERROR_CODES.ACCOUNT_NOT_FOUND,
 			});
 		}
-
-		const remainingAccounts = accounts.filter(
-			(account) => account.providerId === ctx.body.providerId,
-		);
-
-		if (remainingAccounts.length === 1) {
+		if (
+			accounts.length === 1 &&
+			!ctx.context.options.account?.accountLinking?.allowUnlinkingAll
+		) {
 			throw new APIError("BAD_REQUEST", {
 				message: BASE_ERROR_CODES.FAILED_TO_UNLINK_LAST_ACCOUNT,
 			});
 		}
-
 		await ctx.context.internalAdapter.deleteAccount(accountExist.id);
 		return ctx.json({
 			status: true,

packages/better-auth/src/types/options.ts

@@ -440,6 +440,12 @@ export type BetterAuthOptions = {
 			 * ⚠️ Warning: enabling this might lead to account takeovers, so proceed with caution.
 			 */
 			allowDifferentEmails?: boolean;
+			/**
+			 * If enabled (true), this will allow users to unlink all accounts.
+			 *
+			 * @default false
+			 */
+			allowUnlinkingAll?: boolean;
 		};
 	};
 	/**

packages/expo/tsconfig.json

@@ -1,20 +1,25 @@
 {
 	"compilerOptions": {
-		"esModuleInterop": true,
-		"skipLibCheck": true,
+		"declaration": true,
+		"emitDeclarationOnly": true,
+		"declarationMap": true,
+		"outDir": "dist",
+		"noEmit": false,
+		"composite": false,
 		"target": "es2022",
-		"allowJs": true,
-		"resolveJsonModule": true,
-		"module": "ESNext",
-		"noEmit": true,
+		"incremental": true,
 		"moduleResolution": "Bundler",
-		"moduleDetection": "force",
-		"isolatedModules": true,
-		"verbatimModuleSyntax": true,
 		"strict": true,
-		"noImplicitOverride": true,
-		"noFallthroughCasesInSwitch": true
+		"moduleDetection": "force",
+		"module": "Preserve",
+		"skipLibCheck": true,
+		"types": ["node"],
+		"isolatedModules": true,
+		"tsBuildInfoFile": ".tsbuildinfo",
+		"preserveSymlinks": true,
+		"noImplicitOverride": true
 	},
-	"exclude": ["node_modules"],
-	"include": ["src"]
+	"exclude": ["node_modules", "dist"],
+	"references": [],
+	"include": ["src/**/*"]
 }