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

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+import { Observable } from '../Observable';
+import { Falsy, OperatorFunction } from '../types';
+import { operate } from '../util/lift';
+import { createOperatorSubscriber } from './OperatorSubscriber';
+
+export function every<T>(predicate: BooleanConstructor): OperatorFunction<T, Exclude<T, Falsy> extends never ? false : boolean>;
+/** @deprecated Use a closure instead of a `thisArg`. Signatures accepting a `thisArg` will be removed in v8. */
+export function every<T>(
+  predicate: BooleanConstructor,
+  thisArg: any
+): OperatorFunction<T, Exclude<T, Falsy> extends never ? false : boolean>;
+/** @deprecated Use a closure instead of a `thisArg`. Signatures accepting a `thisArg` will be removed in v8. */
+export function every<T, A>(
+  predicate: (this: A, value: T, index: number, source: Observable<T>) => boolean,
+  thisArg: A
+): OperatorFunction<T, boolean>;
+export function every<T>(predicate: (value: T, index: number, source: Observable<T>) => boolean): OperatorFunction<T, boolean>;
+
+/**
+ * Returns an Observable that emits whether or not every item of the source satisfies the condition specified.
+ *
+ * <span class="informal">If all values pass predicate before the source completes, emits true before completion,
+ * otherwise emit false, then complete.</span>
+ *
+ * ![](every.png)
+ *
+ * ## Example
+ *
+ * A simple example emitting true if all elements are less than 5, false otherwise
+ *
+ * ```ts
+ * import { of, every } from 'rxjs';
+ *
+ * of(1, 2, 3, 4, 5, 6)
+ *   .pipe(every(x => x < 5))
+ *   .subscribe(x => console.log(x)); // -> false
+ * ```
+ *
+ * @param predicate A function for determining if an item meets a specified condition.
+ * @param thisArg Optional object to use for `this` in the callback.
+ * @return A function that returns an Observable of booleans that determines if
+ * all items of the source Observable meet the condition specified.
+ */
+export function every<T>(
+  predicate: (value: T, index: number, source: Observable<T>) => boolean,
+  thisArg?: any
+): OperatorFunction<T, boolean> {
+  return operate((source, subscriber) => {
+    let index = 0;
+    source.subscribe(
+      createOperatorSubscriber(
+        subscriber,
+        (value) => {
+          if (!predicate.call(thisArg, value, index++, source)) {
+            subscriber.next(false);
+            subscriber.complete();
+          }
+        },
+        () => {
+          subscriber.next(true);
+          subscriber.complete();
+        }
+      )
+    );
+  });
+}