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Core: improve typing of mapD

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This commit is contained in:
Pieter Vander Vennet 2023-12-03 03:51:18 +01:00
parent 09ea799ad4
commit ab5ec29c02
2 changed files with 30 additions and 12 deletions
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17
src/Logic/UIEventSource.ts
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@ -31,7 +31,7 @@ export class Stores {
* @param promise
* @constructor
*/
public static FromPromise<T>(promise: Promise<T>): Store<T> {
public static FromPromise<T>(promise: Promise<T>): Store<T | undefined> {
const src = new UIEventSource<T>(undefined)
promise?.then((d) => src.setData(d))
promise?.catch((err) => console.warn("Promise failed:", err))
@ -97,7 +97,7 @@ export abstract class Store<T> implements Readable<T> {
abstract map<J>(f: (t: T) => J): Store<J>
abstract map<J>(f: (t: T) => J, extraStoresToWatch: Store<any>[]): Store<J>
public mapD<J>(f: (t: T) => J, extraStoresToWatch?: Store<any>[]): Store<J> {
public mapD<J>(f: (t: Exclude<T, undefined | null>) => J, extraStoresToWatch?: Store<any>[]): Store<J> {
return this.map((t) => {
if (t === undefined) {
return undefined
@ -105,7 +105,7 @@ export abstract class Store<T> implements Readable<T> {
if (t === null) {
return null
}
return f(t)
return f(<Exclude<T, undefined | null>> t)
}, extraStoresToWatch)
}
@ -603,7 +603,7 @@ export class UIEventSource<T> extends Store<T> implements Writable<T> {
*/
public static FromPromiseWithErr<T>(
promise: Promise<T>
): UIEventSource<{ success: T } | { error: any }> {
): UIEventSource<{ success: T } | { error: any } | undefined> {
const src = new UIEventSource<{ success: T } | { error: any }>(undefined)
promise?.then((d) => src.setData({ success: d }))
promise?.catch((err) => src.setData({ error: err }))
@ -771,18 +771,21 @@ export class UIEventSource<T> extends Store<T> implements Writable<T> {
* Monoidal map which results in a read-only store. 'undefined' is passed 'as is'
* Given a function 'f', will construct a new UIEventSource where the contents will always be "f(this.data)'
*/
public mapD<J>(f: (t: T) => J, extraSources: Store<any>[] = []): Store<J | undefined> {
public mapD<J>(f: (t: Exclude<T, undefined | null>) => J, extraSources: Store<any>[] = []): Store<J | undefined> {
return new MappedStore(
this,
(t) => {
if (t === undefined) {
return undefined
}
return f(t)
if (t === null) {
return null
}
return f(<Exclude<T, undefined | null>> t)
},
extraSources,
this._callbacks,
this.data === undefined ? undefined : f(this.data)
(this.data === undefined || this.data === null) ?(<undefined | null> this.data) : f(<any> this.data)
)
}