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Version: 3.0.0-rc.1

Client API do Docusaurus

O Docusaurus oferece algumas APIs nos clientes que podem ser úteis na construção do seu site.

Components​

<ErrorBoundary />​

This component creates a React error boundary.

Use it to wrap components that might throw, and display a fallback when that happens instead of crashing the whole app.

import React from 'react';
import ErrorBoundary from '@docusaurus/ErrorBoundary';

const SafeComponent = () => (
  <ErrorBoundary
    fallback={({error, tryAgain}) => (
      <div>
        <p>This component crashed because of error: {error.message}.</p>
        <button onClick={tryAgain}>Try Again!</button>
      </div>
    )}>
    <SomeDangerousComponentThatMayThrow />
  </ErrorBoundary>
);
tip

To see it in action, click here:

info

Docusaurus uses this component to catch errors within the theme's layout, and also within the entire app.

note

This component doesn't catch build-time errors and only protects against client-side render errors that can happen when using stateful React components.

Props​

  • fallback: an optional render callback returning a JSX element. It will receive an object with 2 attributes: error, the error that was caught, and tryAgain, a function (() => void) callback to reset the error in the component and try rendering it again. If not present, @theme/Error will be rendered instead. @theme/Error is used for the error boundaries wrapping the site, above the layout.
warning

The fallback prop is a callback, and not a React functional component. You can't use React hooks inside this callback.

Este componente React reutilizável irá gerenciar todas as suas alterações na cabeça do documento. Ele leva tags HTML simples e produz tags HTML simples e é amigável para iniciantes. It is a wrapper around React Helmet.

Exemplo de uso:

import React from 'react';
import Head from '@docusaurus/Head';

const MySEO = () => (
  <Head>
    <meta property="og:description" content="My custom description" />
    <meta charSet="utf-8" />
    <title>My Title</title>
    <link rel="canonical" href="http://mysite.com/example" />
  </Head>
);

Os componentes aninhados ou posteriores substituirão os usos duplicados:

<Parent>
  <Head>
    <title>My Title</title>
    <meta name="description" content="Helmet application" />
  </Head>
  <Child>
    <Head>
      <title>Nested Title</title>
      <meta name="description" content="Nested component" />
    </Head>
  </Child>
</Parent>

Resultados:

<head>
  <title>Nested Title</title>
  <meta name="description" content="Nested component" />
</head>

Este componente permite vincular a páginas internas, bem como um poderoso recurso de desempenho chamado pré-carregamento. O pré-carregamento é usado para pré-carregar os recursos para que eles sejam buscados quando o usuário navegar com este componente. We use an IntersectionObserver to fetch a low-priority request when the <Link> is in the viewport and then use an onMouseOver event to trigger a high-priority request when it is likely that a user will navigate to the requested resource.

The component is a wrapper around react-router’s <Link> component that adds useful enhancements specific to Docusaurus. All props are passed through to react-router’s <Link> component.

External links also work, and automatically have these props: target="_blank" rel="noopener noreferrer".

import React from 'react';
import Link from '@docusaurus/Link';

const Page = () => (
  <div>
    <p>
      Check out my <Link to="/blog">blog</Link>!
    </p>
    <p>
      Follow me on <Link to="https://twitter.com/docusaurus">Twitter</Link>!
    </p>
  </div>
);

to: string​

O local de destino navegar. Example: /docs/introduction.

<Link to="/courses" />
tip

Prefer this component to vanilla <a> tags because Docusaurus does a lot of optimizations (e.g. broken path detection, prefetching, applying base URL...) if you use <Link>.

<Redirect/>​

Rendering a <Redirect> will navigate to a new location. The new location will override the current location in the history stack like server-side redirects (HTTP 3xx) do. You can refer to React Router's Redirect documentation for more info on available props.

Example usage:

import React from 'react';
import {Redirect} from '@docusaurus/router';

const Home = () => {
  return <Redirect to="/docs/test" />;
};
note

@docusaurus/router implements React Router and supports its features.

<BrowserOnly/>​

The <BrowserOnly> component permits to render React components only in the browser after the React app has hydrated.

tip

Use it for integrating with code that can't run in Node.js, because the window or document objects are being accessed.

Props​

  • children: render function prop returning browser-only JSX. Will not be executed in Node.js
  • fallback (optional): JSX to render on the server (Node.js) and until React hydration completes.

Example with code​

import BrowserOnly from '@docusaurus/BrowserOnly';

const MyComponent = () => {
  return (
    <BrowserOnly>
      {() => <span>page url = {window.location.href}</span>}
    </BrowserOnly>
  );
};

Example with a library​

import BrowserOnly from '@docusaurus/BrowserOnly';

const MyComponent = (props) => {
  return (
    <BrowserOnly fallback={<div>Loading...</div>}>
      {() => {
        const LibComponent = require('some-lib').LibComponent;
        return <LibComponent {...props} />;
      }}
    </BrowserOnly>
  );
};

<Interpolate/>​

Um componente simples de interpolação para o texto contendo espaços reservados dinâmicos.

Os espaços reservados serão substituídos pelos valores dinâmicos fornecidos e pelos elementos JSX de sua escolha (strings, links, styled elements...).

Props​

  • children: text containing interpolation placeholders like {placeholderName}
  • values: object containing interpolation placeholder values
import React from 'react';
import Link from '@docusaurus/Link';
import Interpolate from '@docusaurus/Interpolate';

export default function VisitMyWebsiteMessage() {
  return (
    <Interpolate
      values={{
        firstName: 'Sébastien',
        website: (
          <Link to="https://docusaurus.io" className="my-website-class">
            website
          </Link>
        ),
      }}>
      {'Hello, {firstName}! How are you? Take a look at my {website}'}
    </Interpolate>
  );
}

<Translate/>​

When localizing your site, the <Translate/> component will allow providing translation support to React components, such as your homepage. The <Translate> component supports interpolation.

The translation strings will statically extracted from your code with the docusaurus write-translations CLI and a code.json translation file will be created in website/i18n/[locale].

note

The <Translate/> props must be hardcoded strings.

Apart from the values prop used for interpolation, it is not possible to use variables, or the static extraction wouldn't work.

Props​

  • children: untranslated string in the default site locale (can contain interpolation placeholders)
  • id: optional value to be used as the key in JSON translation files
  • description: optional text to help the translator
  • values: optional object containing interpolation placeholder values

Example​

src/pages/index.js
import React from 'react';
import Layout from '@theme/Layout';

import Translate from '@docusaurus/Translate';

export default function Home() {
  return (
    <Layout>
      <h1>
        <Translate
          id="homepage.title"
          description="The homepage welcome message">
          Welcome to my website
        </Translate>
      </h1>
      <main>
        <Translate values={{firstName: 'Sébastien'}}>
          {'Welcome, {firstName}! How are you?'}
        </Translate>
      </main>
    </Layout>
  );
}
note

You can even omit the children prop and specify a translation string in your code.json file manually after running the docusaurus write-translations CLI command.

<Translate id="homepage.title" />
info

The <Translate> component supports interpolation. You can also implement string pluralization through some custom code and the translate imperative API.

Hooks​

useDocusaurusContext​

React hook para acessar o Contexto do Docusaurus. The context contains the siteConfig object from docusaurus.config.js and some additional site metadata.

type PluginVersionInformation =
  | {readonly type: 'package'; readonly version?: string}
  | {readonly type: 'project'}
  | {readonly type: 'local'}
  | {readonly type: 'synthetic'};

type SiteMetadata = {
  readonly docusaurusVersion: string;
  readonly siteVersion?: string;
  readonly pluginVersions: Record<string, PluginVersionInformation>;
};

type I18nLocaleConfig = {
  label: string;
  direction: string;
};

type I18n = {
  defaultLocale: string;
  locales: [string, ...string[]];
  currentLocale: string;
  localeConfigs: Record<string, I18nLocaleConfig>;
};

type DocusaurusContext = {
  siteConfig: DocusaurusConfig;
  siteMetadata: SiteMetadata;
  globalData: Record<string, unknown>;
  i18n: I18n;
  codeTranslations: Record<string, string>;
};

Exemplo de uso:

import React from 'react';
import useDocusaurusContext from '@docusaurus/useDocusaurusContext';

const MyComponent = () => {
  const {siteConfig, siteMetadata} = useDocusaurusContext();
  return (
    <div>
      <h1>{siteConfig.title}</h1>
      <div>{siteMetadata.siteVersion}</div>
      <div>{siteMetadata.docusaurusVersion}</div>
    </div>
  );
};
note

The siteConfig object only contains serializable values (values that are preserved after JSON.stringify()). Functions, regexes, etc. would be lost on the client side.

useIsBrowser​

Returns true when the React app has successfully hydrated in the browser.

warning

Use this hook instead of typeof windows !== 'undefined' in React rendering logic.

The first client-side render output (in the browser) must be exactly the same as the server-side render output (Node.js). Not following this rule can lead to unexpected hydration behaviors, as described in The Perils of Rehydration.

Exemplo de uso:

import React from 'react';
import useIsBrowser from '@docusaurus/useIsBrowser';

const MyComponent = () => {
  const isBrowser = useIsBrowser();
  return <div>{isBrowser ? 'Client' : 'Server'}</div>;
};

useBaseUrl​

React hook to prepend your site baseUrl to a string.

warning

Don't use it for regular links!

The /baseUrl/ prefix is automatically added to all absolute paths by default:

  • Markdown: [link](/my/path) will link to /baseUrl/my/path
  • React: <Link to="/my/path/">link</Link> will link to /baseUrl/my/path

Options​

type BaseUrlOptions = {
  forcePrependBaseUrl: boolean;
  absolute: boolean;
};

Example usage:​

import React from 'react';
import useBaseUrl from '@docusaurus/useBaseUrl';

const SomeImage = () => {
  const imgSrc = useBaseUrl('/img/myImage.png');
  return <img src={imgSrc} />;
};
tip

In most cases, you don't need useBaseUrl.

Prefer a require() call for assets:

<img src={require('@site/static/img/myImage.png').default} />

useBaseUrlUtils​

Sometimes useBaseUrl is not good enough. This hook return additional utils related to your site's base URL.

  • withBaseUrl: useful if you need to add base URLs to multiple URLs at once.
import React from 'react';
import {useBaseUrlUtils} from '@docusaurus/useBaseUrl';

const Component = () => {
  const urls = ['/a', '/b'];
  const {withBaseUrl} = useBaseUrlUtils();
  const urlsWithBaseUrl = urls.map(withBaseUrl);
  return <div>{/* ... */}</div>;
};

useGlobalData​

React hook para acessar os dados globais do Docusaurus criados por todos os plugins.

Global data is namespaced by plugin name then by plugin ID.

info

Plugin ID is only useful when a plugin is used multiple times on the same site. Cada instância do plugin é capaz de criar seus próprios dados globais.

type GlobalData = Record<
  PluginName,
  Record<
    PluginId, // "default" by default
    any // plugin-specific data
  >
>;

Exemplo de uso:

import React from 'react';
import useGlobalData from '@docusaurus/useGlobalData';

const MyComponent = () => {
  const globalData = useGlobalData();
  const myPluginData = globalData['my-plugin']['default'];
  return <div>{myPluginData.someAttribute}</div>;
};
tip

Inspect your site's global data at ./docusaurus/globalData.json

usePluginData​

Acesse dados globais criados por uma instância específica do plugin.

This is the most convenient hook to access plugin global data and should be used most of the time.

pluginId is optional if you don't use multi-instance plugins.

function usePluginData(
  pluginName: string,
  pluginId?: string,
  options?: {failfast?: boolean},
);

Exemplo de uso:

import React from 'react';
import {usePluginData} from '@docusaurus/useGlobalData';

const MyComponent = () => {
  const myPluginData = usePluginData('my-plugin');
  return <div>{myPluginData.someAttribute}</div>;
};

useAllPluginInstancesData​

Acesso a dados globais criados por um plugin específico. Dado o nome do plugin, ele retorna os dados de todas as instâncias de plugins desse nome, pelo id do plugin.

function useAllPluginInstancesData(
  pluginName: string,
  options?: {failfast?: boolean},
);

Exemplo de uso:

import React from 'react';
import {useAllPluginInstancesData} from '@docusaurus/useGlobalData';

const MyComponent = () => {
  const allPluginInstancesData = useAllPluginInstancesData('my-plugin');
  const myPluginData = allPluginInstancesData['default'];
  return <div>{myPluginData.someAttribute}</div>;
};

Functions​

interpolate​

The imperative counterpart of the <Interpolate> component.

Signature​

// Simple string interpolation
function interpolate(text: string, values: Record<string, string>): string;

// JSX interpolation
function interpolate(
  text: string,
  values: Record<string, ReactNode>,
): ReactNode;

Example​

import {interpolate} from '@docusaurus/Interpolate';

const message = interpolate('Welcome {firstName}', {firstName: 'Sébastien'});

translate​

The imperative counterpart of the <Translate> component. Also supporting placeholders interpolation.

tip

Use the imperative API for the rare cases where a component cannot be used, such as:

  • the page title metadata
  • the placeholder props of form inputs
  • the aria-label props for accessibility

Signature​

function translate(
  translation: {message: string; id?: string; description?: string},
  values: Record<string, string>,
): string;

Example​

src/pages/index.js
import React from 'react';
import Layout from '@theme/Layout';

import {translate} from '@docusaurus/Translate';

export default function Home() {
  return (
    <Layout
      title={translate({message: 'My page meta title'})}>
      <img
        src={'https://docusaurus.io/logo.png'}
        aria-label={
          translate(
            {
              message: 'The logo of site {siteName}',
              // Optional
              id: 'homepage.logo.ariaLabel',
              description: 'The home page logo aria label',
            },
            {siteName: 'Docusaurus'},
          )
        }
      />
    </Layout>
  );
}

Modules​

ExecutionEnvironment​

A module that exposes a few boolean variables to check the current rendering environment.

warning

For React rendering logic, use useIsBrowser() or <BrowserOnly> instead.

Exemplo:

import ExecutionEnvironment from '@docusaurus/ExecutionEnvironment';

if (ExecutionEnvironment.canUseDOM) {
  require('lib-that-only-works-client-side');
}
CampoDescrição
ExecutionEnvironment.canUseDOMtrue if on client/browser, false on Node.js/prerendering.
ExecutionEnvironment.canUseEventListenerstrue if on client and has window.addEventListener.
ExecutionEnvironment.canUseIntersectionObservertrue if on client and has IntersectionObserver.
ExecutionEnvironment.canUseViewporttrue if on client and has window.screen.

constants​

Um módulo que expõe constantes úteis para o código do tema do lado do cliente.

import {DEFAULT_PLUGIN_ID} from '@docusaurus/constants';
Exportação nomeadaValor
DEFAULT_PLUGIN_IDdefault