# InitColorSchemeScript

- Page: https://jiguang132.com/resources/material-ui/docs/init-color-scheme-script
- Resource: Material UI (https://jiguang132.com/resources/material-ui.md)
- All guides: https://jiguang132.com/resources/material-ui/docs.md

Set the initial color attribute before React hydration in an SSR document.

This guide covers Material UI Core with the default Emotion engine; extensions and additional demos are explicitly classified.

## Use case and business boundary

This is an initialization script, not visible UI; match Provider options, CSP nonce and storage keys, and verify the real server HTML.

## Native composition and scope

`InitColorSchemeScript`

Preserve native Material UI composition and types; do not substitute JGuang UI/Base UI/Radix APIs. Example entries are not extra components.

## Native installation and initialization

```bash
npm install @mui/material@9.4.0 @emotion/react@11.14.0 @emotion/styled@11.14.1
```

Use native npm and Emotion, not an invented JGuang UI Registry URL. Place examples inside native ThemeProvider; choose CssBaseline or ScopedCssBaseline for the project. Inspect React, existing providers, lockfile and SSR first. Never overwrite files or conceal peer conflicts. This batch verified React 19.2.8; React 18 and below require matching react-is. See the included bilingual setup guide.

## Practical native parameters

These selected parameters are not a flattened universal API. Preserve the native declaring owner, slot structure, nullable values and generics.

| Owner.prop | Practical role | Declaration source |
| --- | --- | --- |
| `InitColorSchemeScript.attribute` | Initial color selector; match ThemeProvider colorSchemeSelector. | `InitColorSchemeScript` |
| `InitColorSchemeScript.defaultMode` | Initial native light/dark/system mode when no saved preference exists. | `InitColorSchemeScript` |
| `InitColorSchemeScript.modeStorageKey` | Native mode preference key; match the Provider and avoid other apps' keys. | `InitColorSchemeScript` |
| `InitColorSchemeScript.nonce` | CSP nonce for the server-emitted initialization script. | `InitColorSchemeScript` |

## Runnable native examples

Machine keys select example entries, not universal variant props. Native demo JSX/data stay unchanged; JGuang-authored acceptance fixtures are explicitly labelled.

- Native server rendering and hydration (light) · `Init-light` · JGuang-authored native acceptance
- Native server rendering and hydration (dark) · `Init-dark` · JGuang-authored native acceptance
- Native server rendering and hydration (system) · `Init-system` · JGuang-authored native acceptance

## Actual usage example

JGuang-authored native acceptance fixture, not an upstream component implementation.

```tsx
// JGuang-authored genuine SSR/hydration fixture using Material UI's native APIs.
import { useEffect, useSyncExternalStore } from "react";
import { ThemeProvider, createTheme, useColorScheme } from "@mui/material/styles";
import CssBaseline from "@mui/material/CssBaseline";
import Button from "@mui/material/Button";
import Paper from "@mui/material/Paper";
import Stack from "@mui/material/Stack";
import Typography from "@mui/material/Typography";

export const modeStorageKey = "jguang-material-init-mode";
export const colorSchemeStorageKey = "jguang-material-init-scheme";
const theme = createTheme({ cssVariables: { colorSchemeSelector: "data" }, colorSchemes: { light: true, dark: true } });
export type Mode = "light" | "dark" | "system";
type Props = { defaultMode: Mode; zh: boolean };
const subscribeHydration = () => () => {};
const clientHydrated = () => true;
const serverHydrated = () => false;

function Controls({ defaultMode, zh }: Props) {
  const { mode, systemMode, setMode } = useColorScheme();
  const hydrated = useSyncExternalStore(subscribeHydration, clientHydrated, serverHydrated);
  useEffect(() => {
    const report = () => { const root = document.getElementById("root")!; parent.postMessage({ type: "jguang-preview-ready", token: new URLSearchParams(location.search).get("token") ?? "", height: Math.ceil(root.getBoundingClientRect().bottom + window.scrollY) }, location.origin); };
    const frame = requestAnimationFrame(report);
    const observer = new ResizeObserver(report);
    observer.observe(document.getElementById("root")!);
    return () => { cancelAnimationFrame(frame); observer.disconnect(); };
  }, []);
  const reset = () => {
    // Remove only this fixture's namespaced preferences, never the website's.
    for (const key of [modeStorageKey, `${colorSchemeStorageKey}-light`, `${colorSchemeStorageKey}-dark`]) localStorage.removeItem(key);
    location.reload();
  };
  return <Stack spacing={2}><Typography variant="h5">{zh ? "原生配色初始化与水合" : "Native color initialization and hydration"}</Typography><Paper sx={{ p: 3 }}><Typography>{zh ? "默认模式" : "Default mode"}: {defaultMode}</Typography><Typography role="status" data-hydrated={hydrated ? "true" : "false"} data-native-mode={mode ?? "pending"} data-system-mode={systemMode ?? "pending"}>{zh ? "当前模式" : "Current mode"}: {mode ?? (zh ? "等待水合" : "Awaiting hydration")}</Typography><Stack direction="row" useFlexGap spacing={1} sx={{ mt: 2, flexWrap: "wrap" }}>{(["light", "dark", "system"] as const).map(value => <Button key={value} disabled={!mode} variant={mode === value ? "contained" : "outlined"} onClick={() => setMode(value)}>{zh ? ({ light: "浅色", dark: "深色", system: "跟随系统" })[value] : value}</Button>)}<Button disabled={!hydrated} onClick={reset}>{zh ? "清除演示偏好并刷新" : "Clear demo preference and reload"}</Button></Stack><Typography sx={{ mt: 2 }}>{zh ? "脚本在 React 启动前执行；按钮通过原生 useColorScheme 更新并保存偏好。该工具不是可见 UI 组件，演示面板是 JGuang 编写的验收代码。" : "The native script runs before React starts. Buttons update and persist preferences using useColorScheme. This utility is not a visible UI component; JGuang authored this acceptance panel."}</Typography><input aria-label={zh ? "原生日期" : "Native date"} type="date" defaultValue="2026-01-25" style={{ marginTop: 16 }} /></Paper></Stack>;
}
export default function ColorSchemeApp(props: Props) {
  return <ThemeProvider theme={theme} defaultMode={props.defaultMode} modeStorageKey={modeStorageKey} colorSchemeStorageKey={colorSchemeStorageKey} disableTransitionOnChange><CssBaseline enableColorScheme /><Controls {...props} /></ThemeProvider>;
}

```

## Example dependency boundaries

Native Core/Emotion acceptance fixture.

Direct Icons/System/Utils example imports require their matching 9.4.0 packages. Relative data/helpers are part of the example closure, not extra components. Remote images and simulated operations do not supply a backend.

## Pinned upstream API metadata reference

These tables retain the upstream metadata, not a newly inferred generic type system. Conditional generics, inherited props and callback details are defined by the source declarations below. Theme defaults may override metadata defaults.

### InitColorSchemeScript

```tsx
import InitColorSchemeScript from '@mui/material/InitColorSchemeScript';
import { InitColorSchemeScript } from '@mui/material';
```

| Prop | Required | Upstream metadata type / constraint | Metadata default |
| --- | --- | --- | --- |
| `attribute` | no | `string` | `'data-mui-color-scheme'` |
| `colorSchemeNode` | no | `string` | `'document.documentElement'` |
| `colorSchemeStorageKey` | no | `string` | `'mui-color-scheme'` |
| `defaultDarkColorScheme` | no | `string` | `'dark'` |
| `defaultLightColorScheme` | no | `string` | `'light'` |
| `defaultMode` | no | `'dark' \| 'light' \| 'system'` | `'system'` |
| `modeStorageKey` | no | `string` | `'mui-mode'` |
| `nonce` | no | `string` | — |


## Native source declarations

Declarations/imports are extracted from pinned source without flattening unions or external inheritance. Original English comments/types are source reference, not a claim of translated upstream prose. Shared types stay in their native packages.

### vendor/src/InitColorSchemeScript/InitColorSchemeScript.tsx

```ts
import PropTypes from 'prop-types';

import SystemInitColorSchemeScript from '@mui/system/InitColorSchemeScript';

export interface InitColorSchemeScriptProps {
  /**
   * The default mode when the storage is empty (user's first visit).
   * @default 'system'
   */
  defaultMode?: 'system' | 'light' | 'dark' | undefined;
  /**
   * The default color scheme to be used in light mode.
   * @default 'light'
   */
  defaultLightColorScheme?: string | undefined;
  /**
   * The default color scheme to be used in dark mode.
   * @default 'dark'
   */
  defaultDarkColorScheme?: string | undefined;
  /**
   * The node (provided as string) used to attach the color-scheme attribute.
   * @default 'document.documentElement'
   */
  colorSchemeNode?: string | undefined;
  /**
   * localStorage key used to store `mode`.
   * @default 'mui-mode'
   */
  modeStorageKey?: string | undefined;
  /**
   * localStorage key used to store `colorScheme`.
   * @default 'mui-color-scheme'
   */
  colorSchemeStorageKey?: string | undefined;
  /**
   * DOM attribute for applying a color scheme.
   * @default 'data-mui-color-scheme'
   * @example '.mode-%s' // for class based color scheme
   * @example '[data-mode-%s]' // for data-attribute without '='
   */
  attribute?: 'class' | 'data' | string | undefined;
  /**
   * Nonce string to pass to the inline script for CSP headers.
   */
  nonce?: string | undefined;
}
```

## Post-install acceptance

Run strict types, production build and real interactions. Check keyboard labels/focus, disabled/error/read-only semantics where natively supported, both themes, narrow screens and reduced motion. Verify callbacks against the real host data; do not declare installation complete from copying a prompt. Initialization fixtures also require server HTML and warning-free hydration.

## Source and license

https://github.com/mui/material-ui/tree/809a7717b4c050ba3f69b75300689f07c050a16e

MIT · @mui/material@9.4.0. Vendor originals and license are preserved. Full original upstream prose remains in vendor/docs and is not represented as fully translated.

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