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common.ts
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common.ts
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import {
DRAFT_STATE,
DRAFTABLE,
hasSet,
Objectish,
Drafted,
AnyObject,
AnyArray,
AnyMap,
AnySet,
ImmerState,
hasMap,
ArchtypeObject,
ArchtypeArray,
ArchtypeMap,
ArchtypeSet,
die
} from "../internal"
/** Returns true if the given value is an Immer draft */
/*#__PURE__*/
export function isDraft(value: any): boolean {
return !!value && !!value[DRAFT_STATE]
}
/** Returns true if the given value can be drafted by Immer */
/*#__PURE__*/
export function isDraftable(value: any): boolean {
if (!value) return false
return (
isPlainObject(value) ||
Array.isArray(value) ||
!!value[DRAFTABLE] ||
!!value.constructor[DRAFTABLE] ||
isMap(value) ||
isSet(value)
)
}
/*#__PURE__*/
export function isPlainObject(value: any): boolean {
if (!value || typeof value !== "object") return false
const proto = Object.getPrototypeOf(value)
return !proto || proto === Object.prototype
}
/** Get the underlying object that is represented by the given draft */
/*#__PURE__*/
export function original<T>(value: T): T | undefined
export function original(value: Drafted<any>): any {
if (value && value[DRAFT_STATE]) {
return value[DRAFT_STATE].base_ as any
}
// otherwise return undefined
}
/*#__PURE__*/
export const ownKeys: (target: AnyObject) => PropertyKey[] =
typeof Reflect !== "undefined" && Reflect.ownKeys
? Reflect.ownKeys
: typeof Object.getOwnPropertySymbols !== "undefined"
? obj =>
Object.getOwnPropertyNames(obj).concat(
Object.getOwnPropertySymbols(obj) as any
)
: /* istanbul ignore next */ Object.getOwnPropertyNames
export function each<T extends Objectish>(
obj: T,
iter: (key: string | number, value: any, source: T) => void,
enumerableOnly?: boolean
): void
export function each(obj: any, iter: any, enumerableOnly = false) {
if (getArchtype(obj) === ArchtypeObject) {
;(enumerableOnly ? Object.keys : ownKeys)(obj).forEach(key =>
iter(key, obj[key], obj)
)
} else {
obj.forEach((entry: any, index: any) => iter(index, entry, obj))
}
}
/*#__PURE__*/
export function getArchtype(thing: any): 0 | 1 | 2 | 3 {
/* istanbul ignore next */
const state: undefined | ImmerState = thing[DRAFT_STATE]
return state
? state.type_ > 3
? state.type_ - 4 // cause Object and Array map back from 4 and 5
: (state.type_ as any) // others are the same
: Array.isArray(thing)
? ArchtypeArray
: isMap(thing)
? ArchtypeMap
: isSet(thing)
? ArchtypeSet
: ArchtypeObject
}
/*#__PURE__*/
export function has(thing: any, prop: PropertyKey): boolean {
return getArchtype(thing) === ArchtypeMap
? thing.has(prop)
: Object.prototype.hasOwnProperty.call(thing, prop)
}
/*#__PURE__*/
export function get(thing: AnyMap | AnyObject, prop: PropertyKey): any {
// @ts-ignore
return getArchtype(thing) === ArchtypeMap ? thing.get(prop) : thing[prop]
}
/*#__PURE__*/
export function set(thing: any, propOrOldValue: PropertyKey, value: any) {
const t = getArchtype(thing)
if (t === ArchtypeMap) thing.set(propOrOldValue, value)
else if (t === ArchtypeSet) {
thing.delete(propOrOldValue)
thing.add(value)
} else thing[propOrOldValue] = value
}
/*#__PURE__*/
export function is(x: any, y: any): boolean {
// From: https://github.com/facebook/fbjs/blob/c69904a511b900266935168223063dd8772dfc40/packages/fbjs/src/core/shallowEqual.js
if (x === y) {
return x !== 0 || 1 / x === 1 / y
} else {
return x !== x && y !== y
}
}
/*#__PURE__*/
export function isMap(target: any): target is AnyMap {
return hasMap && target instanceof Map
}
/*#__PURE__*/
export function isSet(target: any): target is AnySet {
return hasSet && target instanceof Set
}
/*#__PURE__*/
export function latest(state: ImmerState): any {
return state.copy_ || state.base_
}
/*#__PURE__*/
export function shallowCopy<T extends AnyObject | AnyArray>(
base: T,
invokeGetters?: boolean
): T
export function shallowCopy(base: any, invokeGetters = false) {
if (Array.isArray(base)) return base.slice()
const clone = Object.create(Object.getPrototypeOf(base))
each(base, (key: any) => {
if (key === DRAFT_STATE) {
return // Never copy over draft state.
}
const desc = Object.getOwnPropertyDescriptor(base, key)!
let {value} = desc
if (desc.get) {
if (!invokeGetters) die(1)
value = desc.get.call(base)
}
if (desc.enumerable) {
clone[key] = value
} else {
Object.defineProperty(clone, key, {
value,
writable: true,
configurable: true
})
}
})
return clone
}
export function freeze(obj: any, deep: boolean): void {
if (isDraft(obj) || isFrozen(obj) || !isDraftable(obj)) return
if (getArchtype(obj) > 1 /* Map or Set */) {
obj.set = obj.add = obj.clear = obj.delete = dontMutateFrozenCollections as any
}
Object.freeze(obj)
if (deep) each(obj, (key, value) => freeze(value, true), true)
}
function dontMutateFrozenCollections() {
die(2)
}
export function isFrozen(obj: any): boolean {
if (obj == null || typeof obj !== "object") return true
// See #600, IE dies on non-objects in Object.isFrozen
return Object.isFrozen(obj)
}