feat(config): add configOverrides for loadNuxt and loadNuxtConf… (#7263)

packages/config/package.json

@@ -12,6 +12,7 @@
   "dependencies": {
     "@nuxt/utils": "2.12.1",
     "consola": "^2.11.3",
+    "defu": "^2.0.2",
     "esm": "^3.2.25",
     "std-env": "^2.2.1"
   },

packages/config/src/load.js

@@ -1,4 +1,5 @@
 import path from 'path'
+import defu from 'defu'
 import consola from 'consola'
 import { clearRequireCache, scanRequireTree } from '@nuxt/utils'
 import esm from 'esm'
@@ -7,7 +8,8 @@ import { defaultNuxtConfigFile } from './config'
 export async function loadNuxtConfig ({
   rootDir = '.',
   configFile = defaultNuxtConfigFile,
-  configContext = {}
+  configContext = {},
+  configOverrides = {}
 } = {}) {
   rootDir = path.resolve(rootDir)
 
@@ -48,7 +50,7 @@ export async function loadNuxtConfig ({
     }
 
     // Don't mutate options export
-    options = Object.assign({}, options)
+    options = defu(configOverrides, options)
 
     // Keep _nuxtConfigFile for watching
     options._nuxtConfigFile = configFile

packages/config/src/options.js

@@ -1,7 +1,7 @@
 import path from 'path'
 import fs from 'fs'
 import defaultsDeep from 'lodash/defaultsDeep'
-import defaults from 'lodash/defaults'
+import defu from 'defu'
 import pick from 'lodash/pick'
 import uniq from 'lodash/uniq'
 import consola from 'consola'
@@ -237,7 +237,7 @@ export function getNuxtConfig (_options) {
 
   // Apply default hash to CSP option
   if (options.render.csp) {
-    options.render.csp = defaults({}, options.render.csp, {
+    options.render.csp = defu(options.render.csp, {
       hashAlgorithm: 'sha256',
       allowedSources: undefined,
       policies: undefined,