Effector React Slots

☄️ Effector library for slots implementation in React.

• What is a slot
• Usage
  • Step 1
  • Step 2
  • Step 3
  • Step 4
  • Step 5
• API
  • createSlotFactory
  • createSlot
  • api.set
  • api.remove
  • api.hide
  • api.show
  • api.attachLogger
    • Arguments
      • fn
      • watchList
• Advanced
  • Fallback content
• TypeScript guide
  • createSlot
• Useful links

What is a slot

A slot is a place in a component where you can insert any unknown component. It's a well-known abstraction used by frameworks such as Vue.js and Svelte.

Slots aren't present in the React. With React you can achieve this goal using props or React.Context. In large projects this is not convenient, because it generates "props hell" or smears the logic.

Using React with Effector we can achieve slot goals avoiding the problems described above.

Try it out

Usage

Step 1

npm install effector-react-slots

or

yarn add effector-react-slots

Step 2

Define constant with slots name and call createSlotFactory.

import { createSlotFactory } from 'effector-react-slots';

export const SLOTS = {
  FOO: 'foo',
} as const;

export const { api, createSlot } = createSlotFactory(SLOTS);

Step 3

Create Slot component.

import { createSlot, SLOTS } from './slots';

export const { Slot: FooSlot } = createSlot(SLOTS.FOO);

Step 4

Insert Slot component to your UI.

import React from 'react';

import { FooSlot } from './fooSlot';

export const ComponentWithSlot = () => (
  <>
    <h1>Hello, Slots!</h1>
    <FooSlot />
  </>
);

Step 5

Render something inside slot. For example, based on data from feature toggle of your app.

import { split } from 'effector';

import { $featureToggle } from './featureToggle';
import { api, SLOTS } from './slots';

const MyAwesomeFeature = () => <p>Look at my horse</p>;
const VeryAwesomeFeature = () => <p>My horse is amaizing</p>;

split({
  source: $featureToggle,
  match: {
    awesome: (data) => data === 'awesome',
    veryAwesome: (data) => data === 'veryAwesome',
  },
  cases: {
    awesome: api.set.prepend(() => ({ id: SLOTS.FOO, component: MyAwesomeFeature })),
    veryAwesome: api.set.prepend(() => ({ id: SLOTS.FOO, component: VeryAwesomeFeature })),
    __: api.remove.prepend(() => ({ id: SLOTS.FOO })),
  },
});

Try it out

API

createSlotFactory

Function that returns a function for creating slots and an API for manipulating them.

const SLOTS = {
  FOO: 'foo'
};

const { createSlot, api } = createSlotFactory(SLOTS);

createSlot

Function, takes the slot id. Returns Slot component.

const { Slot } = createSlot('foo');

api.set

Method for rendering component in a slot. Takes slot id and component.

api.set({ id: 'foo', component: Foo });

api.remove

Method to stop rendering component in a slot. Takes slot id.

api.remove({ id: 'foo' });

api.hide

Allows to hide the slot data. Like api.remove, without deleting the slot data. Takes slot id.

api.hide({ id: 'foo' });

api.show

Allows to show a hidden slot data. Takes slot id.

api.show({ id: 'foo' });

api.attachLogger

Since v2.2.0

Allows to log actions that take place with slots.

api.attachLogger();

slotApi.attachLogger({
  fn: ({ meta: { slotId } }) => console.info(slotId),
});

slotApi.attachLogger({
  watchList: [SLOTS.FOO, SLOTS.BAR],
});

slotApi.attachLogger({
  watchList: [SLOTS.FOO, SLOTS.BAR],
  fn: ({ meta: { slotId } }) => console.info(slotId),
});

Arguments

fn

Optional. Function which could be used for logging. Accepts object:

{
  meta: {
    action: 'set' | 'remove' | 'hide' | 'show',
    slotId: SlotId,
    slotName: string;
  };
  message: string;
}

watchList

type: SlotId[]

Optional. Allows to specify which slots should be logged.

slotApi.attachLogger({
  watchList: [SLOTS.FOO, SLOTS.BAR],
});

Advanced

Fallback content

Since v2.1.0

Slot can contain fallback content that is rendered if no component are passed.

import { render } from 'render';
import { createSlotFactory } from 'effector-react-slots';

const SLOTS = {
  FOO: 'foo',
} as const;

const { api, createSlot } = createSlotFactory(SLOTS);
const { Slot: FooSlot } = createSlot(SLOTS.FOO);

const MyAwesomeFeature = () => <p>Look at my horse</p>;
const ComponentWithSlot = () => <FooSlot>Fallback text</FooSlot>;

render(ComponentWithSlot); // "Fallback text"
api.set({ id: SLOTS.FOO, component: MyAwesomeFeature });
render(ComponentWithSlot); // "Look at my horse"
api.remove({ id: SLOTS.FOO });
render(ComponentWithSlot); // "Fallback text"

TypeScript guide

createSlot

Props of component passed to slot can be defined as generic.

createSlot<{ readonly count: number }>(string);

Useful links

• Slots proposal
• Vue.js docs
• Svelte docs