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node_modules/@vue/cli-service/lib/util/loadFileConfig.js

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+const fs = require('fs')
+const path = require('path')
+const { pathToFileURL } = require('url')
+const isFileEsm = require('is-file-esm')
+const { loadModule } = require('@vue/cli-shared-utils')
+
+module.exports = function loadFileConfig (context) {
+  let fileConfig, fileConfigPath
+
+  const possibleConfigPaths = [
+    process.env.VUE_CLI_SERVICE_CONFIG_PATH,
+    './vue.config.js',
+    './vue.config.cjs',
+    './vue.config.mjs'
+  ]
+  for (const p of possibleConfigPaths) {
+    const resolvedPath = p && path.resolve(context, p)
+    if (resolvedPath && fs.existsSync(resolvedPath)) {
+      fileConfigPath = resolvedPath
+      break
+    }
+  }
+
+  if (fileConfigPath) {
+    const { esm } = isFileEsm.sync(fileConfigPath)
+
+    if (esm) {
+      fileConfig = import(pathToFileURL(fileConfigPath))
+    } else {
+      fileConfig = loadModule(fileConfigPath, context)
+    }
+  }
+
+  return {
+    fileConfig,
+    fileConfigPath
+  }
+}