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node_modules/rxjs/_esm5/operator/first.js

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+/** PURE_IMPORTS_START .._operators_first PURE_IMPORTS_END */
+import { first as higherOrder } from '../operators/first';
+/**
+ * Emits only the first value (or the first value that meets some condition)
+ * emitted by the source Observable.
+ *
+ * <span class="informal">Emits only the first value. Or emits only the first
+ * value that passes some test.</span>
+ *
+ * <img src="./img/first.png" width="100%">
+ *
+ * If called with no arguments, `first` emits the first value of the source
+ * Observable, then completes. If called with a `predicate` function, `first`
+ * emits the first value of the source that matches the specified condition. It
+ * may also take a `resultSelector` function to produce the output value from
+ * the input value, and a `defaultValue` to emit in case the source completes
+ * before it is able to emit a valid value. Throws an error if `defaultValue`
+ * was not provided and a matching element is not found.
+ *
+ * @example <caption>Emit only the first click that happens on the DOM</caption>
+ * var clicks = Rx.Observable.fromEvent(document, 'click');
+ * var result = clicks.first();
+ * result.subscribe(x => console.log(x));
+ *
+ * @example <caption>Emits the first click that happens on a DIV</caption>
+ * var clicks = Rx.Observable.fromEvent(document, 'click');
+ * var result = clicks.first(ev => ev.target.tagName === 'DIV');
+ * result.subscribe(x => console.log(x));
+ *
+ * @see {@link filter}
+ * @see {@link find}
+ * @see {@link take}
+ *
+ * @throws {EmptyError} Delivers an EmptyError to the Observer's `error`
+ * callback if the Observable completes before any `next` notification was sent.
+ *
+ * @param {function(value: T, index: number, source: Observable<T>): boolean} [predicate]
+ * An optional function called with each item to test for condition matching.
+ * @param {function(value: T, index: number): R} [resultSelector] A function to
+ * produce the value on the output Observable based on the values
+ * and the indices of the source Observable. The arguments passed to this
+ * function are:
+ * - `value`: the value that was emitted on the source.
+ * - `index`: the "index" of the value from the source.
+ * @param {R} [defaultValue] The default value emitted in case no valid value
+ * was found on the source.
+ * @return {Observable<T|R>} An Observable of the first item that matches the
+ * condition.
+ * @method first
+ * @owner Observable
+ */
+export function first(predicate, resultSelector, defaultValue) {
+    return higherOrder(predicate, resultSelector, defaultValue)(this);
+}
+//# sourceMappingURL=first.js.map