Fix generateBuildId type that can be async function (#28040)

[The current documentation ensures it can be async function](https://github.com/vercel/next.js/blob/v11.1.1-canary.1/docs/api-reference/next.config.js/configuring-the-build-id.md?plain=1#L13), so this PR fixes the TypeScript type of it.
vercel · Aug 12, 2021 · 1552b83 · 1552b83
1 parent 6403a99
commit 1552b83
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Showing 2 changed files with 2 additions and 2 deletions.
diff --git a/packages/next/build/generate-build-id.ts b/packages/next/build/generate-build-id.ts
@@ -1,5 +1,5 @@
 export async function generateBuildId(
-  generate: () => string | null,
+  generate: () => string | null | Promise<string | null>,
   fallback: () => string
 ): Promise<string> {
   let buildId = await generate()

diff --git a/packages/next/server/config-shared.ts b/packages/next/server/config-shared.ts
@@ -70,7 +70,7 @@ export type NextConfig = { [key: string]: any } & {
   cleanDistDir?: boolean
   assetPrefix?: string
   useFileSystemPublicRoutes?: boolean
-  generateBuildId?: () => string | null
+  generateBuildId?: () => string | null | Promise<string | null>
   generateEtags?: boolean
   pageExtensions?: string[]
   compress?: boolean