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[dotfiles/.git] / .config / coc / extensions / node_modules / coc-prettier / node_modules / rxjs / src / internal / operators / find.ts

diff --git a/.config/coc/extensions/node_modules/coc-prettier/node_modules/rxjs/src/internal/operators/find.ts b/.config/coc/extensions/node_modules/coc-prettier/node_modules/rxjs/src/internal/operators/find.ts
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+import {Observable} from '../Observable';
+import {Operator} from '../Operator';
+import {Subscriber} from '../Subscriber';
+import {OperatorFunction} from '../types';
+
+export function find<T, S extends T>(predicate: (value: T, index: number, source: Observable<T>) => value is S,
+                                     thisArg?: any): OperatorFunction<T, S | undefined>;
+export function find<T>(predicate: (value: T, index: number, source: Observable<T>) => boolean,
+                        thisArg?: any): OperatorFunction<T, T | undefined>;
+/**
+ * Emits only the first value emitted by the source Observable that meets some
+ * condition.
+ *
+ * <span class="informal">Finds the first value that passes some test and emits
+ * that.</span>
+ *
+ * ![](find.png)
+ *
+ * `find` searches for the first item in the source Observable that matches the
+ * specified condition embodied by the `predicate`, and returns the first
+ * occurrence in the source. Unlike {@link first}, the `predicate` is required
+ * in `find`, and does not emit an error if a valid value is not found.
+ *
+ * ## Example
+ * Find and emit the first click that happens on a DIV element
+ * ```ts
+ * import { fromEvent } from 'rxjs';
+ * import { find } from 'rxjs/operators';
+ *
+ * const clicks = fromEvent(document, 'click');
+ * const result = clicks.pipe(find(ev => ev.target.tagName === 'DIV'));
+ * result.subscribe(x => console.log(x));
+ * ```
+ *
+ * @see {@link filter}
+ * @see {@link first}
+ * @see {@link findIndex}
+ * @see {@link take}
+ *
+ * @param {function(value: T, index: number, source: Observable<T>): boolean} predicate
+ * A function called with each item to test for condition matching.
+ * @param {any} [thisArg] An optional argument to determine the value of `this`
+ * in the `predicate` function.
+ * @return {Observable<T>} An Observable of the first item that matches the
+ * condition.
+ * @method find
+ * @owner Observable
+ */
+export function find<T>(predicate: (value: T, index: number, source: Observable<T>) => boolean,
+                        thisArg?: any): OperatorFunction<T, T | undefined> {
+  if (typeof predicate !== 'function') {
+    throw new TypeError('predicate is not a function');
+  }
+  return (source: Observable<T>) => source.lift(new FindValueOperator(predicate, source, false, thisArg)) as Observable<T | undefined>;
+}
+
+export class FindValueOperator<T> implements Operator<T, T | number | undefined> {
+  constructor(private predicate: (value: T, index: number, source: Observable<T>) => boolean,
+              private source: Observable<T>,
+              private yieldIndex: boolean,
+              private thisArg?: any) {
+  }
+
+  call(observer: Subscriber<T>, source: any): any {
+    return source.subscribe(new FindValueSubscriber(observer, this.predicate, this.source, this.yieldIndex, this.thisArg));
+  }
+}
+
+/**
+ * We need this JSDoc comment for affecting ESDoc.
+ * @ignore
+ * @extends {Ignored}
+ */
+export class FindValueSubscriber<T> extends Subscriber<T> {
+  private index: number = 0;
+
+  constructor(destination: Subscriber<T>,
+              private predicate: (value: T, index: number, source: Observable<T>) => boolean,
+              private source: Observable<T>,
+              private yieldIndex: boolean,
+              private thisArg?: any) {
+    super(destination);
+  }
+
+  private notifyComplete(value: any): void {
+    const destination = this.destination;
+
+    destination.next(value);
+    destination.complete();
+    this.unsubscribe();
+  }
+
+  protected _next(value: T): void {
+    const {predicate, thisArg} = this;
+    const index = this.index++;
+    try {
+      const result = predicate.call(thisArg || this, value, index, this.source);
+      if (result) {
+        this.notifyComplete(this.yieldIndex ? index : value);
+      }
+    } catch (err) {
+      this.destination.error(err);
+    }
+  }
+
+  protected _complete(): void {
+    this.notifyComplete(this.yieldIndex ? -1 : undefined);
+  }
+}