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node_modules/rxjs/src/internal/operators/combineLatestWith.ts

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+import { ObservableInputTuple, OperatorFunction, Cons } from '../types';
+import { combineLatest } from './combineLatest';
+
+/**
+ * Create an observable that combines the latest values from all passed observables and the source
+ * into arrays and emits them.
+ *
+ * Returns an observable, that when subscribed to, will subscribe to the source observable and all
+ * sources provided as arguments. Once all sources emit at least one value, all of the latest values
+ * will be emitted as an array. After that, every time any source emits a value, all of the latest values
+ * will be emitted as an array.
+ *
+ * This is a useful operator for eagerly calculating values based off of changed inputs.
+ *
+ * ## Example
+ *
+ * Simple concatenation of values from two inputs
+ *
+ * ```ts
+ * import { fromEvent, combineLatestWith, map } from 'rxjs';
+ *
+ * // Setup: Add two inputs to the page
+ * const input1 = document.createElement('input');
+ * document.body.appendChild(input1);
+ * const input2 = document.createElement('input');
+ * document.body.appendChild(input2);
+ *
+ * // Get streams of changes
+ * const input1Changes$ = fromEvent(input1, 'change');
+ * const input2Changes$ = fromEvent(input2, 'change');
+ *
+ * // Combine the changes by adding them together
+ * input1Changes$.pipe(
+ *   combineLatestWith(input2Changes$),
+ *   map(([e1, e2]) => (<HTMLInputElement>e1.target).value + ' - ' + (<HTMLInputElement>e2.target).value)
+ * )
+ * .subscribe(x => console.log(x));
+ * ```
+ *
+ * @param otherSources the other sources to subscribe to.
+ * @return A function that returns an Observable that emits the latest
+ * emissions from both source and provided Observables.
+ */
+export function combineLatestWith<T, A extends readonly unknown[]>(
+  ...otherSources: [...ObservableInputTuple<A>]
+): OperatorFunction<T, Cons<T, A>> {
+  return combineLatest(...otherSources);
+}