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diff --git a/.config/coc/extensions/node_modules/coc-prettier/node_modules/rxjs/src/internal/operators/expand.ts b/.config/coc/extensions/node_modules/coc-prettier/node_modules/rxjs/src/internal/operators/expand.ts
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+import { Observable } from '../Observable';
+import { Operator } from '../Operator';
+import { Subscriber } from '../Subscriber';
+import { Subscription } from '../Subscription';
+import { OuterSubscriber } from '../OuterSubscriber';
+import { InnerSubscriber } from '../InnerSubscriber';
+import { subscribeToResult } from '../util/subscribeToResult';
+import { MonoTypeOperatorFunction, OperatorFunction, ObservableInput, SchedulerLike } from '../types';
+
+/* tslint:disable:max-line-length */
+export function expand<T, R>(project: (value: T, index: number) => ObservableInput<R>, concurrent?: number, scheduler?: SchedulerLike): OperatorFunction<T, R>;
+export function expand<T>(project: (value: T, index: number) => ObservableInput<T>, concurrent?: number, scheduler?: SchedulerLike): MonoTypeOperatorFunction<T>;
+/* tslint:enable:max-line-length */
+
+/**
+ * Recursively projects each source value to an Observable which is merged in
+ * the output Observable.
+ *
+ * <span class="informal">It's similar to {@link mergeMap}, but applies the
+ * projection function to every source value as well as every output value.
+ * It's recursive.</span>
+ *
+ * ![](expand.png)
+ *
+ * Returns an Observable that emits items based on applying a function that you
+ * supply to each item emitted by the source Observable, where that function
+ * returns an Observable, and then merging those resulting Observables and
+ * emitting the results of this merger. *Expand* will re-emit on the output
+ * Observable every source value. Then, each output value is given to the
+ * `project` function which returns an inner Observable to be merged on the
+ * output Observable. Those output values resulting from the projection are also
+ * given to the `project` function to produce new output values. This is how
+ * *expand* behaves recursively.
+ *
+ * ## Example
+ * Start emitting the powers of two on every click, at most 10 of them
+ * ```ts
+ * import { fromEvent, of } from 'rxjs';
+ * import { expand, mapTo, delay, take } from 'rxjs/operators';
+ *
+ * const clicks = fromEvent(document, 'click');
+ * const powersOfTwo = clicks.pipe(
+ *   mapTo(1),
+ *   expand(x => of(2 * x).pipe(delay(1000))),
+ *   take(10),
+ * );
+ * powersOfTwo.subscribe(x => console.log(x));
+ * ```
+ *
+ * @see {@link mergeMap}
+ * @see {@link mergeScan}
+ *
+ * @param {function(value: T, index: number) => Observable} project A function
+ * that, when applied to an item emitted by the source or the output Observable,
+ * returns an Observable.
+ * @param {number} [concurrent=Number.POSITIVE_INFINITY] Maximum number of input
+ * Observables being subscribed to concurrently.
+ * @param {SchedulerLike} [scheduler=null] The {@link SchedulerLike} to use for subscribing to
+ * each projected inner Observable.
+ * @return {Observable} An Observable that emits the source values and also
+ * result of applying the projection function to each value emitted on the
+ * output Observable and and merging the results of the Observables obtained
+ * from this transformation.
+ * @method expand
+ * @owner Observable
+ */
+export function expand<T, R>(project: (value: T, index: number) => ObservableInput<R>,
+                             concurrent: number = Number.POSITIVE_INFINITY,
+                             scheduler: SchedulerLike = undefined): OperatorFunction<T, R> {
+  concurrent = (concurrent || 0) < 1 ? Number.POSITIVE_INFINITY : concurrent;
+
+  return (source: Observable<T>) => source.lift(new ExpandOperator(project, concurrent, scheduler));
+}
+
+export class ExpandOperator<T, R> implements Operator<T, R> {
+  constructor(private project: (value: T, index: number) => ObservableInput<R>,
+              private concurrent: number,
+              private scheduler: SchedulerLike) {
+  }
+
+  call(subscriber: Subscriber<R>, source: any): any {
+    return source.subscribe(new ExpandSubscriber(subscriber, this.project, this.concurrent, this.scheduler));
+  }
+}
+
+interface DispatchArg<T, R> {
+  subscriber: ExpandSubscriber<T, R>;
+  result: ObservableInput<R>;
+  value: any;
+  index: number;
+}
+
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+export class ExpandSubscriber<T, R> extends OuterSubscriber<T, R> {
+  private index: number = 0;
+  private active: number = 0;
+  private hasCompleted: boolean = false;
+  private buffer: any[];
+
+  constructor(destination: Subscriber<R>,
+              private project: (value: T, index: number) => ObservableInput<R>,
+              private concurrent: number,
+              private scheduler: SchedulerLike) {
+    super(destination);
+    if (concurrent < Number.POSITIVE_INFINITY) {
+      this.buffer = [];
+    }
+  }
+
+  private static dispatch<T, R>(arg: DispatchArg<T, R>): void {
+    const {subscriber, result, value, index} = arg;
+    subscriber.subscribeToProjection(result, value, index);
+  }
+
+  protected _next(value: any): void {
+    const destination = this.destination;
+
+    if (destination.closed) {
+      this._complete();
+      return;
+    }
+
+    const index = this.index++;
+    if (this.active < this.concurrent) {
+      destination.next(value);
+      try {
+        const { project } = this;
+        const result = project(value, index);
+        if (!this.scheduler) {
+          this.subscribeToProjection(result, value, index);
+        } else {
+          const state: DispatchArg<T, R> = { subscriber: this, result, value, index };
+          const destination = this.destination as Subscription;
+          destination.add(this.scheduler.schedule<DispatchArg<T, R>>(ExpandSubscriber.dispatch, 0, state));
+        }
+      } catch (e) {
+        destination.error(e);
+      }
+    } else {
+      this.buffer.push(value);
+    }
+  }
+
+  private subscribeToProjection(result: any, value: T, index: number): void {
+    this.active++;
+    const destination = this.destination as Subscription;
+    destination.add(subscribeToResult<T, R>(this, result, value, index));
+  }
+
+  protected _complete(): void {
+    this.hasCompleted = true;
+    if (this.hasCompleted && this.active === 0) {
+      this.destination.complete();
+    }
+    this.unsubscribe();
+  }
+
+  notifyNext(outerValue: T, innerValue: R,
+             outerIndex: number, innerIndex: number,
+             innerSub: InnerSubscriber<T, R>): void {
+    this._next(innerValue);
+  }
+
+  notifyComplete(innerSub: Subscription): void {
+    const buffer = this.buffer;
+    const destination = this.destination as Subscription;
+    destination.remove(innerSub);
+    this.active--;
+    if (buffer && buffer.length > 0) {
+      this._next(buffer.shift());
+    }
+    if (this.hasCompleted && this.active === 0) {
+      this.destination.complete();
+    }
+  }
+}