fix: clean up edge functions during build (#1588)

* fix: clean up edge functions before build

* chore: format

Author: ascorbic

packages/runtime/src/helpers/edge.ts

@@ -123,12 +123,20 @@ const writeEdgeFunction = async ({
   }
 }
 
+type NetlifyPluginConstantsWithEdgeFunctions = NetlifyPluginConstants & {
+  // Until https://github.com/netlify/build/pull/4481 lands
+  INTERNAL_EDGE_FUNCTIONS_SRC?: string
+}
+
+export const cleanupEdgeFunctions = async ({
+  INTERNAL_EDGE_FUNCTIONS_SRC = '.netlify/edge-functions',
+}: NetlifyPluginConstantsWithEdgeFunctions) => {
+  await emptyDir(INTERNAL_EDGE_FUNCTIONS_SRC)
+}
+
 export const writeDevEdgeFunction = async ({
   INTERNAL_EDGE_FUNCTIONS_SRC = '.netlify/edge-functions',
-}: NetlifyPluginConstants & {
-  // The constants type needs an update
-  INTERNAL_EDGE_FUNCTIONS_SRC?: string
-}) => {
+}: NetlifyPluginConstantsWithEdgeFunctions) => {
   const manifest: FunctionManifest = {
     functions: [
       {

packages/runtime/src/index.ts

@@ -16,7 +16,12 @@ import {
   generateCustomHeaders,
 } from './helpers/config'
 import { onPreDev } from './helpers/dev'
-import { enableEdgeInNextConfig, writeEdgeFunctions, loadMiddlewareManifest } from './helpers/edge'
+import {
+  enableEdgeInNextConfig,
+  writeEdgeFunctions,
+  loadMiddlewareManifest,
+  cleanupEdgeFunctions,
+} from './helpers/edge'
 import { moveStaticPages, movePublicFiles, patchNextFiles } from './helpers/files'
 import { generateFunctions, setupImageFunction, generatePagesResolver } from './helpers/functions'
 import { generateRedirects, generateStaticRedirects } from './helpers/redirects'
@@ -81,6 +86,8 @@ const plugin: NetlifyPlugin = {
       },
     )
 
+    await cleanupEdgeFunctions(constants)
+
     const middlewareManifest = await loadMiddlewareManifest(netlifyConfig)
 
     let usingEdge = false