react-overridable

react-overridable

With react-overridable you can mark your React components as overridable and allow other apps to customize them. This can be useful when creating libraries with a default implementation of components which requires to be overridden at runtime.

You can inject new props, override render elements or the component itself.

Usage

Create a React component and mark it as overridable:

import PropTypes from 'prop-types';
import React, {Component} from 'react';
import Overridable, {parametrize, OverridableContext} from 'react-overridable';

class TitleComponent extends Component {
  static propTypes = {
    title: PropTypes.string.isRequired,
    children: PropTypes.oneOfType([PropTypes.node, PropTypes.func]),
  };

  static defaultProps = {
    children: null,
  };

  render() {
    const {title, children} = this.props;
    return (
      <Overridable id="TitleComponent.container" title={title}>
        <>
          <div>{title}</div>
          {children}
        </>
      </Overridable>
    );
  }
}

export const OverridableExampleComponent = Overridable.component('TitleComponent', TitleComponent);

In this example, the TitleComponent is marked as overridable inside the render function, via the React component <Overridable /> and then exported via the Higher-Order component Overridable.component. Each overridable component is identified by a unique id.

After marking components as overridable, there are 3 ways that you can use to override:

1. Provide new props with parametrize: define new props to override the default component props.

const parametrized = parametrize(OverridableExampleComponent, {
  title: 'My new title',
});
// create a map {<component id>: <parametrized props>}
const overriddenComponents = {TitleComponent: parametrized};

1. Provide new render elements: override the default rendered elements for the marked sections. Props are passed and can be used in the new template.

const overriddenRenderElement = ({title}) => (
  <h1>{title}</h1>
);
// create a map {<render element id>: <new render elements>}
const overriddenComponents = {TitleComponent.container: overriddenRenderElement};

1. Provide a new component: you can replace the existing component with a new one.

const NewComponent = () => <strong>This is a new title</strong>;
// create a map {<component id>: <new component>}
const overriddenComponents = {TitleComponent: NewComponent};

In your app, inject the map of ids-components in the React Context OverridableContext so that the react-overridable library can use it and replace components when the default are rendered:

class App extends Component {
  render() {
    return (
      <OverridableContext.Provider value={overriddenComponents}>
        <....>
      </OverridableContext.Provider>
    )
  }
}

Install

To install the library, you will have to install the peer dependencies.

npm i react-overridable
npm i <peer dependencies>

Development

To run tests:

npm run test

To build the library:

npm run build

Note

In applying the MIT license, CERN does not waive the privileges and immunities granted to it by virtue of its status as an Intergovernmental Organization or submit itself to any jurisdiction.

Changelog

0.0.3 (May 15, 2020)

• Remove 'use strict' directive from the built CommonJS module dist, which was wrong and breaking Babel runtime helper. Sites using Content-Security-Policies headers were reporting 'unsafe-eval' error.