fix: fix memoization

helpers/getNextConfig.js

@@ -1,30 +1,27 @@
+'use strict'
+
 const { resolve } = require('path')
 
-let nextConfig
+const moize = require('moize')
 
 // Load next.config.js
 const getNextConfig = async function (failBuild = defaultFailBuild) {
-  // Memoizes `nextConfig`
-  if (nextConfig !== undefined) {
-    return nextConfig
-  }
-
   // We cannot load `next` at the top-level because we validate whether the
   // site is using `next` inside `onPreBuild`.
   const { PHASE_PRODUCTION_BUILD } = require('next/constants')
   const loadConfig = require('next/dist/next-server/server/config').default
 
   try {
-    nextConfig = await loadConfig(PHASE_PRODUCTION_BUILD, resolve('.'))
+    return await loadConfig(PHASE_PRODUCTION_BUILD, resolve('.'))
   } catch (error) {
     return failBuild('Error loading your next.config.js.', { error })
   }
-
-  return nextConfig
 }
 
+const moizedGetNextConfig = moize(getNextConfig, { maxSize: 1e3, isPromise: true })
+
 const defaultFailBuild = function (message, { error }) {
   throw new Error(`${message}\n${error.stack}`)
 }
 
-module.exports = getNextConfig
+module.exports = moizedGetNextConfig

package.json

@@ -48,6 +48,7 @@
     "fs-extra": "^9.1.0",
     "jimp": "^0.16.1",
     "make-dir": "^3.1.0",
+    "moize": "^6.0.0",
     "semver": "^7.3.2"
   },
   "devDependencies": {