@nozbe/with-observables

HOC (Higher-Order Component) for connecting RxJS Observables to React Components

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withObservables

MIT License CI Status npm

A higher-order component for connecting RxJS Observables to React components.

Example

(Taken from WatermelonDB)

const Post = ({ post, comments }) => (
  <article>
    <h1>{post.name}</h1>
    <p>{post.body}</p>
    <h2>Comments</h2>
    {comments.map(comment =>
      <EnhancedComment key={comment.id} comment={comment} />
    )}
  </article>
)

const enhance = withObservables(['post'], ({ post }) => ({
  post: post.observe(),
  comments: post.comments.observe()
}))

const EnhancedPost = enhance(Post)

➡️ Learn more: Connecting WatermelonDB to Components

Installation

yarn add @nozbe/with-observables

And then to use:

import withObservables from '@nozbe/with-observables'

Usage

withObservables(triggerProps, getObservables)

// Injects new props to a component with values from the passed Observables
//
// Every time one of the `triggerProps` changes, `getObservables()` is called
// and the returned Observables are subscribed to.
//
// Every time one of the Observables emits a new value, the matching inner prop is updated.
//
// You can return multiple Observables in the function. You can also return arbitrary objects that have
// an `observe()` function that returns an Observable.
//
// The inner component will not render until all supplied Observables return their first values.
// If `triggerProps` change, renders will also be paused until the new Observables emit first values.
//
// If you only want to subscribe to Observables once (the Observables don't depend on outer props),
// pass `null` to `triggerProps`.
//
// Errors are re-thrown in render(). Use React Error Boundary to catch them.
//
// Example use:
//   withObservables(['task'], ({ task }) => ({
//     task: task,
//     comments: task.comments.observe()
//   }))

Typescript

The TypeScript bindings expose a helper type, ObservableifyProps<Props, ObservableKeys, ObservableConvertibleKeys> which can make it easier to wrap components without duplicating interfaces:

interface Props {
  post: Post;
  author: Author;
  someOtherProp: boolean;
  anotherProp: number;
}

const PostRenderer: React.FC<Props> = (props) => ( ... );

type InputProps = ObservableifyProps<Props, "author", "post">
const enhance = withObservables(["post", "author"], ({ post }: InputProps) => ({
  post,
  author: author.observe()
});

export default enhance(PostRenderer);

Or you can let getObservables define your props for you:

import withObservables, {ExtractedObservables} from "@nozbe/with-observables"

const getObservables = ({ post }: { post: Post }}) => ({
  post,
  author: author.observe()
});

interface Props extends ExtractedObservables<ReturnType<typeof getObservables>> {
  someOtherProp: boolean;
  anotherProp: number;
}

const PostRenderer: React.FC<Props> = (props) => (
  <>{props.author.id}</>
);

export default withObservables(["post"], getObservables)(PostRenderer);

Author and license

withObservables was created by @Nozbe for WatermelonDB.

withObservables is available under the MIT license. See the LICENSE file for more info.

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