feat(cli): add secret generator command for the cli (#659)

docs/content/docs/concepts/cli.mdx

@@ -40,4 +40,13 @@ npx @better-auth/cli@latest migrate
 
 If you see this error, it means the CLI can’t resolve imported modules in your Better Auth config file. We're working on a fix for many of these issues, but in the meantime, you can try the following:
 
-- Remove any import aliases in your config file and use relative paths instead. After running the CLI, you can revert to using aliases.
+- Remove any import aliases in your config file and use relative paths instead. After running the CLI, you can revert to using aliases.
+
+
+## Secret
+
+The CLI also provides a way to generate a secret key for your Better Auth instance.
+
+```bash title="Terminal"
+npx @better-auth/cli@latest secret
+```

docs/content/docs/concepts/typescript.mdx

@@ -22,6 +22,28 @@ To avoid instantiation and reference errors, configure your TypeScript config fi
 
 If you're using a monorepo and want to share the `auth` package across multiple projects, either export the TypeScript files as-is without compilation or use build tools like `tsup` to transpile the package.
 
+### Strict Mode
+
+Better Auth is designed to work with TypeScript's strict mode. We recommend enabling strict mode in your TypeScript config file:
+
+```json title="tsconfig.json"
+{
+  "compilerOptions": {
+    "strict": true
+  }
+}
+```
+
+if you can't set `strict` to `true`, you can enable `strictNullChecks`:
+
+```json title="tsconfig.json"
+{
+  "compilerOptions": {
+    "strictNullChecks": true,
+  }
+}
+```
+
 ## Inferring Types
 
 Both the client SDK and the server offer types that can be inferred using the `$Infer` property. Plugins can extend base types like `User` and `Session`, and you can use `$Infer` to infer these types. Additionally, plugins can provide extra types that can also be inferred through `$Infer`.

packages/cli/src/commands/secert.ts

@@ -0,0 +1,12 @@
+import { logger } from "better-auth";
+import chalk from "chalk";
+import { Command } from "commander";
+import Crypto from "crypto";
+
+export const generateSecret = new Command("secret").action(() => {
+	const secret = Crypto.randomBytes(32).toString("hex");
+	logger.info(`\nAdd the following to your .env file: 
+${
+	chalk.gray("# Auth Secret") + chalk.green(`\nBETTER_AUTH_SECRET=${secret}`)
+}`);
+});

packages/cli/src/index.ts

@@ -4,12 +4,14 @@ import { Command } from "commander";
 import { migrate } from "./commands/migrate";
 import { generate } from "./commands/generate";
 import "dotenv/config";
+import { generateSecret } from "./commands/secert";
 
 async function main() {
 	const program = new Command("better-auth");
 	program
 		.addCommand(migrate)
 		.addCommand(generate)
+		.addCommand(generateSecret)
 		.version("0.0.1")
 		.description("Better Auth CLI");
 	program.parse();