1 /** PURE_IMPORTS_START _util_EmptyError,_filter,_take,_defaultIfEmpty,_throwIfEmpty,_util_identity PURE_IMPORTS_END */
2 import { EmptyError } from '../util/EmptyError';
3 import { filter } from './filter';
4 import { take } from './take';
5 import { defaultIfEmpty } from './defaultIfEmpty';
6 import { throwIfEmpty } from './throwIfEmpty';
7 import { identity } from '../util/identity';
8 export function first(predicate, defaultValue) {
9 var hasDefaultValue = arguments.length >= 2;
10 return function (source) { return source.pipe(predicate ? filter(function (v, i) { return predicate(v, i, source); }) : identity, take(1), hasDefaultValue ? defaultIfEmpty(defaultValue) : throwIfEmpty(function () { return new EmptyError(); })); };
12 //# sourceMappingURL=first.js.map