perf(nuxt): iterate rather than using Object.fromEntries (#24953)

packages/nuxt/src/core/nitro.ts

@@ -260,16 +260,17 @@ export async function initNitro (nuxt: Nuxt & { _nitro?: Nitro }) {
         const _routeRules = nitro.options.routeRules
         for (const key in _routeRules) {
           if (key === '/__nuxt_error') { continue }
-          const filteredRules = Object.entries(_routeRules[key])
-            .filter(([key, value]) => ['prerender', 'redirect'].includes(key) && value)
-            .map(([key, value]: any) => {
-              if (key === 'redirect') {
-                return [key, typeof value === 'string' ? value : value.to]
+          let hasRules = false
+          const filteredRules = {} as Record<string, any>
+          for (const routeKey in _routeRules[key]) {
+            const value = (_routeRules as any)[key][routeKey]
+            if (['prerender', 'redirect'].includes(routeKey) && value) {
+              filteredRules[routeKey] = routeKey === 'redirect' ? typeof value === 'string' ? value : value.to : value
+              hasRules = true
             }
-              return [key, value]
-            })
-          if (filteredRules.length > 0) {
-            routeRules[key] = Object.fromEntries(filteredRules)
+          }
+          if (hasRules) {
+            routeRules[key] = filteredRules
           }
         }
 

packages/nuxt/src/core/plugins/layer-aliasing.ts

@@ -17,22 +17,23 @@ const ALIAS_RE = /(?<=['"])[~@]{1,2}(?=\/)/g
 const ALIAS_RE_SINGLE = /(?<=['"])[~@]{1,2}(?=\/)/
 
 export const LayerAliasingPlugin = createUnplugin((options: LayerAliasingOptions) => {
-  const aliases = Object.fromEntries(options.layers.map((l) => {
-    const srcDir = l.config.srcDir || l.cwd
-    const rootDir = l.config.rootDir || l.cwd
-    const publicDir = join(srcDir, l.config?.dir?.public || 'public')
+  const aliases: Record<string, { aliases: Record<string, string>, prefix: string, publicDir: false | string }> = {}
+  for (const layer of options.layers) {
+    const srcDir = layer.config.srcDir || layer.cwd
+    const rootDir = layer.config.rootDir || layer.cwd
+    const publicDir = join(srcDir, layer.config?.dir?.public || 'public')
 
-    return [srcDir, {
+    aliases[srcDir] = {
       aliases: {
-        '~': l.config?.alias?.['~'] || srcDir,
-        '@': l.config?.alias?.['@'] || srcDir,
-        '~~': l.config?.alias?.['~~'] || rootDir,
-        '@@': l.config?.alias?.['@@'] || rootDir
+        '~': layer.config?.alias?.['~'] || srcDir,
+        '@': layer.config?.alias?.['@'] || srcDir,
+        '~~': layer.config?.alias?.['~~'] || rootDir,
+        '@@': layer.config?.alias?.['@@'] || rootDir
       },
       prefix: relative(options.root, publicDir),
       publicDir: !options.dev && existsSync(publicDir) && publicDir
-    }]
-  }))
+    }
+  }
   const layers = Object.keys(aliases).sort((a, b) => b.length - a.length)
 
   return {

packages/nuxt/src/core/templates.ts

@@ -155,7 +155,12 @@ export const schemaTemplate: NuxtTemplate<TemplateContext> = {
     const relativeRoot = relative(resolve(nuxt.options.buildDir, 'types'), nuxt.options.rootDir)
     const getImportName = (name: string) => (name[0] === '.' ? './' + join(relativeRoot, name) : name).replace(/\.\w+$/, '')
     const modules = moduleInfo.map(meta => [genString(meta.configKey), getImportName(meta.importName)])
-
+    const privateRuntimeConfig = Object.create(null)
+    for (const key in nuxt.options.runtimeConfig) {
+      if (key !== 'public') {
+        privateRuntimeConfig[key] = nuxt.options.runtimeConfig[key]
+      }
+    }
     return [
       "import { NuxtModule, RuntimeConfig } from 'nuxt/schema'",
       "declare module 'nuxt/schema' {",
@@ -165,7 +170,7 @@ export const schemaTemplate: NuxtTemplate<TemplateContext> = {
       ),
       modules.length > 0 ? `    modules?: (undefined | null | false | NuxtModule | string | [NuxtModule | string, Record<string, any>] | ${modules.map(([configKey, importName]) => `[${genString(importName)}, Exclude<NuxtConfig[${configKey}], boolean>]`).join(' | ')})[],` : '',
       '  }',
-      generateTypes(await resolveSchema(Object.fromEntries(Object.entries(nuxt.options.runtimeConfig).filter(([key]) => key !== 'public')) as Record<string, JSValue>),
+      generateTypes(await resolveSchema(privateRuntimeConfig as Record<string, JSValue>),
         {
           interfaceName: 'RuntimeConfig',
           addExport: false,

packages/nuxt/src/head/runtime/components.ts

@@ -12,8 +12,16 @@ import type {
   Target
 } from './types'
 
-const removeUndefinedProps = (props: Props) =>
-  Object.fromEntries(Object.entries(props).filter(([, value]) => value !== undefined))
+const removeUndefinedProps = (props: Props) => {
+  const filteredProps = Object.create(null)
+  for (const key in props) {
+    const value = props[key]
+    if (value !== undefined) {
+      filteredProps[key] = value;
+    }
+  }
+  return filteredProps
+}
 
 const setupForUseMeta = (metaFactory: (props: Props, ctx: SetupContext) => Record<string, any>, renderChild?: boolean) => (props: Props, ctx: SetupContext) => {
   useHead(() => metaFactory({ ...removeUndefinedProps(props), ...ctx.attrs }, ctx))

packages/vite/src/plugins/composable-keys.ts

@@ -22,7 +22,10 @@ const NUXT_LIB_RE = /node_modules\/(nuxt|nuxt3|nuxt-nightly)\//
 const SUPPORTED_EXT_RE = /\.(m?[jt]sx?|vue)/
 
 export const composableKeysPlugin = createUnplugin((options: ComposableKeysOptions) => {
-  const composableMeta = Object.fromEntries(options.composables.map(({ name, ...meta }) => [name, meta]))
+  const composableMeta: Record<string, any> = {}
+  for (const { name, ...meta } of options.composables) {
+    composableMeta[name] = meta
+  }
 
   const maxLength = Math.max(...options.composables.map(({ argumentLength }) => argumentLength))
   const keyedFunctions = new Set(options.composables.map(({ name }) => name))