Initial commit: Book management system with Rust Loco backend and Vue 3 frontend

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2026-04-30 00:26:47 +08:00
commit 1f22546766
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import { EmptyError } from '../util/EmptyError';
import { filter } from './filter';
import { take } from './take';
import { defaultIfEmpty } from './defaultIfEmpty';
import { throwIfEmpty } from './throwIfEmpty';
import { identity } from '../util/identity';
export function first(predicate, defaultValue) {
var hasDefaultValue = arguments.length >= 2;
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(); }));
};
}
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