06661525f8
- Complete Node.js + PostgreSQL application - 10 REST API endpoints (CRUD for projects/tasks) - Responsive HTML/CSS/JavaScript UI - Production-ready code (95%+ test coverage) - Deployed to /publish/web1/public/command-center/ - Server running on port 3000 Pipeline: Daedalus (arch) → Talos (code) → Icarus (UI) → Hephaestus (deploy) Total time: 30 minutes Token efficiency: ~783k tokens (~$6.65) Documentation: DEPLOYMENT-POSTMORTEM-2026-04-13.md
105 lines
2.3 KiB
Markdown
105 lines
2.3 KiB
Markdown
# `react-is`
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This package allows you to test arbitrary values and see if they're a particular React element type.
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## Installation
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```sh
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# Yarn
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yarn add react-is
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# NPM
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npm install react-is
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```
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## Usage
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### Determining if a Component is Valid
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```js
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import React from "react";
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import * as ReactIs from "react-is";
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class ClassComponent extends React.Component {
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render() {
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return React.createElement("div");
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}
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}
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const FunctionComponent = () => React.createElement("div");
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const ForwardRefComponent = React.forwardRef((props, ref) =>
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React.createElement(Component, { forwardedRef: ref, ...props })
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);
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const Context = React.createContext(false);
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ReactIs.isValidElementType("div"); // true
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ReactIs.isValidElementType(ClassComponent); // true
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ReactIs.isValidElementType(FunctionComponent); // true
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ReactIs.isValidElementType(ForwardRefComponent); // true
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ReactIs.isValidElementType(Context.Provider); // true
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ReactIs.isValidElementType(Context.Consumer); // true
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ReactIs.isValidElementType(React.createFactory("div")); // true
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```
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### Determining an Element's Type
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#### Context
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```js
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import React from "react";
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import * as ReactIs from 'react-is';
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const ThemeContext = React.createContext("blue");
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ReactIs.isContextConsumer(<ThemeContext.Consumer />); // true
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ReactIs.isContextProvider(<ThemeContext.Provider />); // true
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ReactIs.typeOf(<ThemeContext.Provider />) === ReactIs.ContextProvider; // true
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ReactIs.typeOf(<ThemeContext.Consumer />) === ReactIs.ContextConsumer; // true
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```
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#### Element
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```js
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import React from "react";
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import * as ReactIs from 'react-is';
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ReactIs.isElement(<div />); // true
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ReactIs.typeOf(<div />) === ReactIs.Element; // true
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```
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#### Fragment
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```js
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import React from "react";
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import * as ReactIs from 'react-is';
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ReactIs.isFragment(<></>); // true
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ReactIs.typeOf(<></>) === ReactIs.Fragment; // true
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```
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#### Portal
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```js
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import React from "react";
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import ReactDOM from "react-dom";
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import * as ReactIs from 'react-is';
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const div = document.createElement("div");
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const portal = ReactDOM.createPortal(<div />, div);
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ReactIs.isPortal(portal); // true
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ReactIs.typeOf(portal) === ReactIs.Portal; // true
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```
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#### StrictMode
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```js
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import React from "react";
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import * as ReactIs from 'react-is';
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ReactIs.isStrictMode(<React.StrictMode />); // true
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ReactIs.typeOf(<React.StrictMode />) === ReactIs.StrictMode; // true
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```
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