@fluxfast/core

Framework-neutral browser runtime for the FluxFast protocol. It provides the resource store, router, transport, cache, mutation, history, event, and prefetch primitives shared by frontend adapters.

Most applications should install an adapter such as @fluxfast/next or @fluxfast/vite, which installs a compatible version of this package automatically. Install the core package directly when building an adapter or using its framework-neutral APIs:

npm install @fluxfast/core

import {
  FluxRouter,
  ResourceStore,
  createValidator,
  refineValidator,
  formatValidationPath,
  type FluxValidator,
  type ValidationResult,
  type ValidationIssue,
} from "@fluxfast/core";

@fluxfast/core includes the framework-neutral, dependency-free runtime validation engine used by @fluxfast/next's generated validators. It supports reusable schemas, structured issues, dot/bracket path formatting, bounded evaluation limits, and synchronous refinements with zero external dependencies.

@fluxfast/core has no React, Next.js, Vue, Svelte, or Solid dependency. It supports Node.js 22 and 24, while the browser-facing APIs target modern web runtimes.

FluxFast 1.2 adds server adapter primitives through @fluxfast/core/server, separately from this browser-facing root. The initial surface provides fetchFluxInitialPage, selectFluxForwardHeaders, and removeFluxHopByHopHeaders; it does not require a change to existing Next.js applications. This subpath is not present in the published v1.1 package. See the Core API inventory for the supported inputs, outputs, and security boundaries.

See the FluxFast architecture, native client validation, wire protocol, and versioning policy for the public contracts.

FluxFast is licensed under the MIT License.