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

diff --git a/.config/coc/extensions/node_modules/coc-prettier/node_modules/rxjs/src/internal/operators/distinctUntilKeyChanged.ts b/.config/coc/extensions/node_modules/coc-prettier/node_modules/rxjs/src/internal/operators/distinctUntilKeyChanged.ts
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+import { distinctUntilChanged } from './distinctUntilChanged';
+import { MonoTypeOperatorFunction } from '../types';
+
+/* tslint:disable:max-line-length */
+export function distinctUntilKeyChanged<T>(key: keyof T): MonoTypeOperatorFunction<T>;
+export function distinctUntilKeyChanged<T, K extends keyof T>(key: K, compare: (x: T[K], y: T[K]) => boolean): MonoTypeOperatorFunction<T>;
+/* tslint:enable:max-line-length */
+
+/**
+ * Returns an Observable that emits all items emitted by the source Observable that are distinct by comparison from the previous item,
+ * using a property accessed by using the key provided to check if the two items are distinct.
+ *
+ * If a comparator function is provided, then it will be called for each item to test for whether or not that value should be emitted.
+ *
+ * If a comparator function is not provided, an equality check is used by default.
+ *
+ * ## Examples
+ * An example comparing the name of persons
+ * ```typescript
+ * import { of } from 'rxjs';
+ * import { distinctUntilKeyChanged } from 'rxjs/operators';
+ *
+ *  interface Person {
+ *     age: number,
+ *     name: string
+ *  }
+ *
+ * of<Person>(
+ *     { age: 4, name: 'Foo'},
+ *     { age: 7, name: 'Bar'},
+ *     { age: 5, name: 'Foo'},
+ *     { age: 6, name: 'Foo'},
+ *   ).pipe(
+ *     distinctUntilKeyChanged('name'),
+ *   )
+ *   .subscribe(x => console.log(x));
+ *
+ * // displays:
+ * // { age: 4, name: 'Foo' }
+ * // { age: 7, name: 'Bar' }
+ * // { age: 5, name: 'Foo' }
+ * ```
+ *
+ * An example comparing the first letters of the name
+ * ```typescript
+ * import { of } from 'rxjs';
+ * import { distinctUntilKeyChanged } from 'rxjs/operators';
+ *
+ * interface Person {
+ *     age: number,
+ *     name: string
+ *  }
+ *
+ * of<Person>(
+ *     { age: 4, name: 'Foo1'},
+ *     { age: 7, name: 'Bar'},
+ *     { age: 5, name: 'Foo2'},
+ *     { age: 6, name: 'Foo3'},
+ *   ).pipe(
+ *     distinctUntilKeyChanged('name', (x: string, y: string) => x.substring(0, 3) === y.substring(0, 3)),
+ *   )
+ *   .subscribe(x => console.log(x));
+ *
+ * // displays:
+ * // { age: 4, name: 'Foo1' }
+ * // { age: 7, name: 'Bar' }
+ * // { age: 5, name: 'Foo2' }
+ * ```
+ *
+ * @see {@link distinct}
+ * @see {@link distinctUntilChanged}
+ *
+ * @param {string} key String key for object property lookup on each item.
+ * @param {function} [compare] Optional comparison function called to test if an item is distinct from the previous item in the source.
+ * @return {Observable} An Observable that emits items from the source Observable with distinct values based on the key specified.
+ * @method distinctUntilKeyChanged
+ * @owner Observable
+ */
+export function distinctUntilKeyChanged<T, K extends keyof T>(key: K, compare?: (x: T[K], y: T[K]) => boolean): MonoTypeOperatorFunction<T> {
+  return distinctUntilChanged((x: T, y: T) => compare ? compare(x[key], y[key]) : x[key] === y[key]);
+}