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the first value that meets some condition)\n * emitted by the source Observable.\n *\n * <span class=\"informal\">Emits only the first value. Or emits only the first\n * value that passes some test.</span>\n *\n * ![](first.png)\n *\n * If called with no arguments, `first` emits the first value of the source\n * Observable, then completes. If called with a `predicate` function, `first`\n * emits the first value of the source that matches the specified condition. It\n * may also take a deprecated `resultSelector` function to produce the output\n * value from the input value, and a `defaultValue` to emit in case the source\n * completes before it is able to emit a valid value. Throws an error if\n * `defaultValue` was not provided and a matching element is not found.\n *\n * ## Examples\n * Emit only the first click that happens on the DOM\n * ```javascript\n * const clicks = fromEvent(document, 'click');\n * const result = clicks.pipe(first());\n * result.subscribe(x => console.log(x));\n * ```\n *\n * Emits the first click that happens on a DIV\n * ```javascript\n * const clicks = fromEvent(document, 'click');\n * const result = clicks.pipe(first(ev => ev.target.tagName === 'DIV'));\n * result.subscribe(x => console.log(x));\n * ```\n *\n * @see {@link filter}\n * @see {@link find}\n * @see {@link take}\n *\n * @throws {EmptyError} Delivers an EmptyError to the Observer's `error`\n * callback if the Observable completes before any `next` notification was sent.\n *\n * @param {function(value: T, index: number, source: Observable<T>): boolean} [predicate]\n * An optional function called with each item to test for condition matching.\n * @param {R} [defaultValue] The default value emitted in case no valid value\n * was found on the source.\n * @return {Observable<T|R>} An Observable of the first item that matches the\n * condition.\n * @method first\n * @owner Observable\n */\nexport function first<T, D>(\n  predicate?: ((value: T, index: number, source: Observable<T>) => boolean) | null,\n  defaultValue?: D\n): OperatorFunction<T, T | D> {\n  const hasDefaultValue = arguments.length >= 2;\n  return (source: Observable<T>) => source.pipe(\n    predicate ? filter((v, i) => predicate(v, i, source)) : identity,\n    take(1),\n    hasDefaultValue ? defaultIfEmpty<T | D>(defaultValue) : throwIfEmpty(() => new EmptyError()),\n  );\n}\n"},"lineCount":null}},"hash":"3268fa88f907be59ce505a303ad9d5f8","cacheData":{"env":{}}}