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Add type annotations to BaseObservable

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This commit is contained in:
Danila Fedorin 2021-09-29 17:27:31 -07:00
parent d73dea797a
commit 319027e2e3
1 changed files with 13 additions and 17 deletions
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30
src/observable/BaseObservable.ts
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@ -14,20 +14,18 @@ See the License for the specific language governing permissions and
limitations under the License. limitations under the License.
*/ */
export class BaseObservable { export abstract class BaseObservable<T> {
constructor() { protected _handlers: Set<T> = new Set<T>();
this._handlers = new Set();
}
onSubscribeFirst() { onSubscribeFirst(): void {
} }
onUnsubscribeLast() { onUnsubscribeLast(): void {
} }
subscribe(handler) { subscribe(handler: T): () => void {
this._handlers.add(handler); this._handlers.add(handler);
if (this._handlers.size === 1) { if (this._handlers.size === 1) {
this.onSubscribeFirst(); this.onSubscribeFirst();
@ -37,7 +35,7 @@ export class BaseObservable {
}; };
} }
unsubscribe(handler) { unsubscribe(handler: T | null): null {
if (handler) { if (handler) {
this._handlers.delete(handler); this._handlers.delete(handler);
if (this._handlers.size === 0) { if (this._handlers.size === 0) {
@ -48,14 +46,14 @@ export class BaseObservable {
return null; return null;
} }
unsubscribeAll() { unsubscribeAll(): void {
if (this._handlers.size !== 0) { if (this._handlers.size !== 0) {
this._handlers.clear(); this._handlers.clear();
this.onUnsubscribeLast(); this.onUnsubscribeLast();
} }
} }
get hasSubscriptions() { get hasSubscriptions(): boolean {
return this._handlers.size !== 0; return this._handlers.size !== 0;
} }
@ -63,13 +61,11 @@ export class BaseObservable {
} }
export function tests() { export function tests() {
class Collection extends BaseObservable { class Collection extends BaseObservable<{}> {
constructor() { firstSubscribeCalls: number= 0;
super(); firstUnsubscribeCalls: number = 0;
this.firstSubscribeCalls = 0;
this.firstUnsubscribeCalls = 0; onSubscribeFirst() { this.firstSubscribeCalls += 1; }
}
onSubscribeFirst() { this.firstSubscribeCalls += 1; }
onUnsubscribeLast() { this.firstUnsubscribeCalls += 1; } onUnsubscribeLast() { this.firstUnsubscribeCalls += 1; }
} }