chore: removes incorrect type additions

docs/configuration/overview.mdx

@@ -27,6 +27,26 @@ The Payload Config is strongly typed and ties directly into Payload's TypeScript
   details](#customizing-the-config-location).
 </Banner>
 
+#### Functionally building your config
+
+You can optionally pass a function to `buildConfig` which is helpful if you need to first fetch secrets or define how you want Payload to work prior to initializing it.
+
+Here's an example:
+
+```ts
+import { buildConfig } from 'payload'
+import { fetchMySecrets } from './secrets'
+
+export default buildConfig(async () => {
+  const mySecrets = await fetchMySecrets()
+
+  return {
+    secret: mySecrets.PAYLOAD_SECRET,
+    // The rest of your config goes here
+  }
+})
+```
+
 ## Config Options
 
 To author your Payload Config, first determine which [Database](../database/overview) you'd like to use, then use [Collections](./collections) or [Globals](./globals) to define the schema of your data through [Fields](../fields/overview).

packages/payload/src/config/build.ts

@@ -4,10 +4,14 @@ import { sanitizeConfig } from './sanitize.js'
 
 /**
  * @description Builds and validates Payload configuration
- * @param config Payload Config
+ * @param config Payload Config or async function that returns a Config
  * @returns Built and sanitized Payload Config
  */
-export async function buildConfig(config: Config): Promise<SanitizedConfig> {
+export async function buildConfig(
+  configArg: (() => Config | Promise<Config>) | Config,
+): Promise<SanitizedConfig> {
+  const config = typeof configArg === 'function' ? await configArg() : configArg
+
   if (Array.isArray(config.plugins)) {
     let configAfterPlugins = config
     for (const plugin of config.plugins) {