Fix EsLint Brackets (error markup 'const').

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

@@ -0,0 +1,54 @@
+import { Observable } from '../Observable';
+import { Operator } from '../Operator';
+import { Subscriber } from '../Subscriber';
+import { EmptyError } from '../util/EmptyError';
+import { OperatorFunction } from '../../internal/types';
+import { filter } from './filter';
+import { takeLast } from './takeLast';
+import { throwIfEmpty } from './throwIfEmpty';
+import { defaultIfEmpty } from './defaultIfEmpty';
+import { identity } from '../util/identity';
+
+/* tslint:disable:max-line-length */
+export function last<T, D = T>(
+  predicate?: null,
+  defaultValue?: D
+): OperatorFunction<T, T | D>;
+export function last<T, S extends T>(
+  predicate: (value: T, index: number, source: Observable<T>) => value is S,
+  defaultValue?: S
+): OperatorFunction<T, S>;
+export function last<T, D = T>(
+  predicate: (value: T, index: number, source: Observable<T>) => boolean,
+  defaultValue?: D
+): OperatorFunction<T, T | D>;
+/* tslint:enable:max-line-length */
+
+/**
+ * Returns an Observable that emits only the last item emitted by the source Observable.
+ * It optionally takes a predicate function as a parameter, in which case, rather than emitting
+ * the last item from the source Observable, the resulting Observable will emit the last item
+ * from the source Observable that satisfies the predicate.
+ *
+ * ![](last.png)
+ *
+ * @throws {EmptyError} Delivers an EmptyError to the Observer's `error`
+ * callback if the Observable completes before any `next` notification was sent.
+ * @param {function} [predicate] - The condition any source emitted item has to satisfy.
+ * @param {any} [defaultValue] - An optional default value to provide if last
+ * predicate isn't met or no values were emitted.
+ * @return {Observable} An Observable that emits only the last item satisfying the given condition
+ * from the source, or an NoSuchElementException if no such items are emitted.
+ * @throws - Throws if no items that match the predicate are emitted by the source Observable.
+ */
+export function last<T, D>(
+  predicate?: ((value: T, index: number, source: Observable<T>) => boolean) | null,
+  defaultValue?: D
+): OperatorFunction<T, T | D> {
+  const hasDefaultValue = arguments.length >= 2;
+  return (source: Observable<T>) => source.pipe(
+    predicate ? filter((v, i) => predicate(v, i, source)) : identity,
+    takeLast(1),
+    hasDefaultValue ? defaultIfEmpty<T | D>(defaultValue) : throwIfEmpty(() => new EmptyError()),
+  );
+}