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November 15, 2017 19:42
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Thoughts about reactive architecture
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| import * as m from 'mithril' | |
| import * as stream from 'mithril/stream' | |
| interface State { | |
| error: boolean | |
| counter: number | |
| } | |
| // state | |
| const counter = stream(0) | |
| const error = stream(false) | |
| const state: stream.Stream<State> = stream | |
| .merge([counter, error]) | |
| .map(([counter, error]: [number, boolean]) => { | |
| return { | |
| counter, | |
| error | |
| } | |
| }) | |
| const getState = () => state() | |
| // action | |
| const updateCounter = (n: number) => counter(n) | |
| const setError = (exists: boolean) => error(exists) | |
| // .. usecase, can have Promise or callback for progress update to m.redraw | |
| const updateCounterUseCase = (n: number) => { | |
| if (n >= -10 && n <= 10) { | |
| setError(false) | |
| updateCounter(n) | |
| } else { | |
| setError(true) | |
| } | |
| } | |
| const appRoot = document.createElement('div') | |
| appRoot.id = 'app' | |
| document.body.appendChild(appRoot) | |
| const Home: m.Component< | |
| {}, | |
| { | |
| getState: () => State | |
| updateCounter: (n: number) => void | |
| } | |
| > = { | |
| oninit: vnode => { | |
| vnode.state = { | |
| getState, | |
| updateCounter: updateCounterUseCase | |
| } | |
| }, | |
| view: vnode => { | |
| console.log('redraw') | |
| const state = vnode.state.getState() | |
| const { updateCounter } = vnode.state | |
| return m('', [ | |
| m('h1', 'Home route. ' + state.counter), | |
| m('div', state.error ? 'You are out of bounds, stop it!' : 'You are OK!'), | |
| m( | |
| 'button', | |
| { | |
| onclick: (e: MouseEvent) => updateCounter(state.counter - 1), | |
| onmousemove: (e: MouseEvent) => { | |
| e.redraw = false | |
| } | |
| }, | |
| 'Decrement' | |
| ), | |
| m( | |
| 'button', | |
| { onclick: (e: MouseEvent) => updateCounter(state.counter + 1) }, | |
| 'Increment' | |
| ) | |
| ]) | |
| } | |
| } | |
| m.route(appRoot, 'home', { | |
| home: Home | |
| }) |
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| import * as m from 'mithril' | |
| import * as stream from 'mithril/stream' | |
| import { __, converge, findIndex, identity, update } from 'ramda' | |
| // Core idea is to use onion architecture with usecases as glue | |
| // | |
| // view state \ | |
| // ==— uscases | |
| // actions services gateways ... / | |
| // | |
| // views use usecases for intent and take streams from state (or get state for redux liek state) | |
| // usecases act as glue and know just about contracts (they can be passthrough for simple cases, like actions) | |
| // actions is the only place to update state | |
| // component state can be in components and other parts of application can talk to each other if it makes sense | |
| // for testing use DI dividing module into two files (componentFolder -> [component.ts, index.ts]) | |
| // style as you please | |
| // todo: take a look at react-redux, to think about react implementation | |
| type Diff<T extends string, U extends string> = ({ [P in T]: P } & | |
| { [P in U]: never } & { [x: string]: never })[T] | |
| type Omit<T, K extends keyof T> = { [P in Diff<keyof T, K>]: T[P] } | |
| interface Todo { | |
| id: number | |
| text: string | |
| } | |
| interface State { | |
| todos: Todo[] | |
| } | |
| // state | |
| const todos = stream<Todo[]>([]) | |
| const state: stream.Stream<State> = stream.merge([todos]).map(([todos]) => { | |
| return { | |
| todos | |
| } | |
| }) | |
| state.map(console.log) | |
| // actions | |
| const addTodo = (todo: Todo) => { | |
| todos([...todos(), todo]) | |
| } | |
| const updateTodo = (id: number, todo: Omit<Todo, 'id'>) => { | |
| todos( | |
| converge(update(__, { ...todo, id }), [ | |
| findIndex((t: Todo) => t.id === id), | |
| identity | |
| ])(todos()) | |
| ) | |
| } | |
| // .. usecase, can have Promise or callback for progress update to m.redraw | |
| const addTodoUseCase = addTodo | |
| const updateTodoUseCase = updateTodo | |
| // component | |
| const Todos: m.Component< | |
| {}, | |
| { | |
| todos: stream.Stream<Todo[]> | |
| addTodo: (todo: Todo) => void | |
| updateTodo: (id: number, todo: Omit<Todo, 'id'>) => void | |
| } | |
| > = { | |
| oninit: vnode => { | |
| vnode.state = { | |
| todos: todos, | |
| addTodo: addTodoUseCase, | |
| updateTodo: updateTodoUseCase | |
| } | |
| }, | |
| view: ({ state }) => { | |
| // console.log(todos()) | |
| return m('', [ | |
| m('h1', 'Todos:'), | |
| m( | |
| 'ul', | |
| state.todos().map(todo => | |
| m( | |
| 'li', | |
| m('input', { | |
| value: todo.text, | |
| oninput: (e: Event & { target: HTMLInputElement }) => { | |
| state.updateTodo(todo.id, { | |
| text: e.target.value | |
| }) | |
| } | |
| }) | |
| ) | |
| ) | |
| ), | |
| m( | |
| 'button', | |
| { | |
| onclick: () => state.addTodo({ id: +new Date(), text: '' }) | |
| }, | |
| 'add todo' | |
| ) | |
| ]) | |
| } | |
| } | |
| // app | |
| const appRoot = document.createElement('div') | |
| appRoot.id = 'app' | |
| document.body.appendChild(appRoot) | |
| m.route(appRoot, 'home', { | |
| home: Todos | |
| }) |
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