MobX & History.js make some ♡

History.js wrapper with observable location and reactive URLSearchParams

Install

• NPM npm i mobx-observable-history
• Yarn yarn add mobx-observable-history

Dependencies:

• mobx: "^6.0"
• history: "^4.0"

Why

When work on projects mobx it feels natural to use reactivity everywhere.

Benefits

• convenient api to manage current location's state
• observable history.location and history.action
• observable history.searchParams is URLSearchParams object with extra goodies (see below)
• compatible with react-router

Examples

import { autorun, reaction, comparer } from "mobx"
import { createBrowserHistory } from "history";
import { createObservableHistory } from "mobx-observable-history"

const history = createBrowserHistory();
const navigation = createObservableHistory(history);

// Reacting to any location change
autorun(() => {
  const {pathname, search, hash} = navigation.location
  console.log("LOCATION", {pathname, search, hash})
})

// Reacting to partial location change
reaction(() => navigation.location.pathname, page => {
  console.log("PAGE", page)
})

// Reacting to multiple values of one search param, e.g. ?y=1&y=2
reaction(() => navigation.searchParams.getAll("y"), params => {
  console.log("Y", params) // params is ["1", "2"]
}, {
  fireImmediately: true,
  equals: comparer.shallow,
})

// Partial updates
navigation.location.pathname = "/path"  // push history to new location, same as navigation.merge("/path")
navigation.location.search = "?x=1" // `?` can be omitted
navigation.location.hash = "#y" // `#` can be omitted
navigation.merge({pathname: "/path", search: "z=3"}) // push history to new location 
navigation.searchParams.delete("x") // remove all ?x=1&x=.. from search params
navigation.searchParams.set("y", "2") // remove previous all ?y=1&y=2&y=etc. and set to single value

API

history.toString(): string

Get observable location (pathname + search + hash)

Examples:

autorun(() => console.log("LOCATION", history.toString()))

history.merge(location: object | Partial, replace?: boolean): void

Merge partial location (pathname, search, hash)

Examples:

history.merge({pathname: "/test"})       // history.push + merge
history.merge("/test?x=1&x2#tag")
history.merge({pathname: "/test"}, true) // history.replace + merge

history.normalize(location: string | LocationDescriptor, opts?: { skipEmpty = false }): string

Normalize location and return new object {pathname, search, hash}

history.destroy(): History

Stops internal observations and return native history.js object

history.searchParams is observable URLSearchParams() with extra goodies:

• history.searchParams.merge(search: string | object | URLSearchParams)

  Merge new search params with existing.

• history.searchParams.replace(search: string | object | URLSearchParams)

  Fully replace current search params.

• history.searchParams.deleteAll()

  Clear all current search params.

• history.searchParams.toString(opts?: { withPrefix = false })

  Observable search-params string representation.

  • {withPrefix: true} adds ? prefix to output (default: false)

License

MIT