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“There is no terror in the bang, only in the anticipation of it.”\n\u003e\n\u003e — \u003ccite\u003eAlfred Hitchcock\u003c/cite\u003e\n\n\u003cdiv align=\"center\"\u003e\n\u003ca href=\"https://hitchcock-movies.netlify.com\"\u003e\n\u003cimg alt=\"Suspense Debugger\" src=\"https://user-images.githubusercontent.com/1911623/38225137-d49061ea-36c9-11e8-8042-f3b7e17fb07b.gif\" /\u003e\n\u003c/a\u003e\n\u003c/div\u003e\n\n# Hitchcock [![npm version](https://img.shields.io/npm/v/hitchcock.svg?style=flat)](https://www.npmjs.com/package/hitchcock)\n\n**Hitchcock is a debugging tool for React Suspense.** It wraps your calls to `React.lazy()`, provides a simple cache ([based on react-cache](https://github.com/facebook/react/tree/master/packages/react-cache)) and let you pause, delay or invalidate your promises.\n\n### 🚨 EXPERIMENTAL 🚨\n\nUse this only for experimenting with [the new React Concurrent Mode](https://reactjs.org/docs/concurrent-mode-intro.html). Hitchcock is inefficient and unstable. Also, I have no idea what I'm doing.\n\n## Demos\n\n- [**Movies**](https://hitchcock-movies.netlify.com):\n  A clone of [@karl clone](https://github.com/karl/react-async-io-testbed) of [@dan_abramov demo](https://www.youtube.com/watch?v=6g3g0Q_XVb4)\n- [**Suspensify**](https://hitchcock-suspensify.netlify.com):\n  A clone of the [suspense demo](https://github.com/jaredpalmer/react-conf-2018) from [Jared Palmer](https://twitter.com/jaredpalmer)'s [React Conf talk](https://www.youtube.com/watch?v=SCQgE4mTnjU\u0026feature=youtu.be).\n\nThe code is in the [examples folder](https://github.com/pomber/hitchcock/tree/master/examples).\n\n## Usage\n\n\u003e Try it on [CodeSandbox](https://codesandbox.io/s/ovqlz507pz)\n\nAdd the dependency:\n\n```bash\n$ yarn add hitchcock\n```\n\n### Director\n\nImport the `Director` component and add it somewhere in your app:\n\n```jsx\nimport { Director } from \"hitchcock\";\n\nfunction YourApp() {\n  return (\n    \u003cDirector\u003e\n      \u003cYourStuff /\u003e\n    \u003c/Director\u003e\n  );\n}\n```\n\n### Lazy\n\nInstead of using `React.lazy` import `lazy` from hitchcock:\n\n```jsx\nimport { lazy } from \"hitchcock\";\n\nconst HomePage = lazy(() =\u003e import(\"./components/HomePage\"));\n\n// Hitchcock's lazy accepts a second parameter with the name of the component:\nconst ArtistPage = lazy(() =\u003e import(\"./components/ArtistPage\"), \"ArtistPage\");\n// it's optional, but recommended, it isn't always easy to guess the name from the import\n```\n\n### createResource\n\n```jsx\nimport { createResource } from \"hitchcock\";\n\nconst BeerResource = createResource(\n  id =\u003e\n    fetch(`https://api.punkapi.com/v2/beers/${id}`)\n      .then(r =\u003e r.json())\n      .then(d =\u003e d[0]),\n  id =\u003e `beer-${id}`\n);\n\nfunction Beer({ beerId }) {\n  const beer = BeerResource.read(beerId);\n  return (\n    \u003c\u003e\n      \u003ch1\u003e{beer.name}\u003c/h1\u003e\n      \u003cp\u003e{beer.description}\u003c/p\u003e\n    \u003c/\u003e\n  );\n}\n```\n\n`createResource` has two parameters. The first one is a function that returns a promise. The second one is a function that returns an id, that id is used as the key in the cache and also is used as the name of the resource in the debugger.\n\nIt returns a `resource` with a `read` method that will suspend a component until the resource is ready (when the promise resolves).\n\n### Waterfalls\n\n[React docs warn about using Suspense as a way to start fetching data when a component renders](https://reactjs.org/docs/concurrent-mode-suspense.html#for-library-authors). The recommended approach is to start fetching before rendering, for example, in an event handler. Hitchcock doesn't solve this problem, but it provides a `preload` method if you want to try:\n\n```jsx\nimport React, { Suspense } from \"react\";\nimport ReactDOM from \"react-dom\";\nimport { createResource, Director } from \"hitchcock\";\n\nconst BeerResource = createResource(\n  id =\u003e\n    fetch(`https://api.punkapi.com/v2/beers/${id}`)\n      .then(r =\u003e r.json())\n      .then(d =\u003e d[0]),\n  id =\u003e `beer-${id}`\n);\n\nfunction App() {\n  const [beerId, setBeerId] = React.useState(0);\n  const deferredBeerId = React.useDeferredValue(beerId, { timeoutMs: 1000 });\n\n  const showBeer = deferredBeerId \u003e 0;\n\n  const handleChange = e =\u003e {\n    const newBeerId = +e.target.value;\n    BeerResource.preload(newBeerId);\n    setBeerId(newBeerId);\n  };\n\n  return (\n    \u003cDirector\u003e\n      Beer # \u003cinput type=\"number\" value={beerId} onChange={handleChange} /\u003e\n      \u003cSuspense fallback={\u003cdiv\u003e{`Loading beer #${beerId}...`}\u003c/div\u003e}\u003e\n        {showBeer \u0026\u0026 \u003cBeer beerId={deferredBeerId} /\u003e}\n      \u003c/Suspense\u003e\n    \u003c/Director\u003e\n  );\n}\n\nfunction Beer({ beerId }) {\n  const beer = BeerResource.read(beerId);\n  return (\n    \u003c\u003e\n      \u003ch1\u003e{beer.name}\u003c/h1\u003e\n      \u003cp\u003e{beer.description}\u003c/p\u003e\n    \u003c/\u003e\n  );\n}\n\nconst container = document.getElementById(\"root\");\nReactDOM.createRoot(container).render(\u003cApp /\u003e);\n```\n\n## Contributing\n\n```bash\n$ git clone git@github.com:pomber/hitchcock.git\n$ cd hitchcock\n$ npx lerna bootstrap\n```\n\nRun the examples:\n\n```bash\n$ yarn start:example movies\n$ yarn start:example suspensify\n```\n\nPublish new version:\n\n```bash\n$ yarn build:packages\n$ npx lerna publish\n```\n\n## License\n\nReleased under MIT license.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fpomber%2Fhitchcock","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fpomber%2Fhitchcock","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fpomber%2Fhitchcock/lists"}