Installation

npm install @mrzr/api-client
# or
pnpm add @mrzr/api-client
yarn add @mrzr/api-client
bun add @mrzr/api-client

The package ships ESM + CJS + TypeScript declarations and has no runtime dependencies.

Requirements

Any runtime with fetch and AbortController:

Runtime	Minimum
Node.js	20 (enforced via `engines`)
Chrome / Edge	80+
Firefox	78+
Safari	14+
Deno	1.x+
Bun	1.x+
Cloudflare Workers	✅

Optional capabilities degrade gracefully when missing:

Capability	Used for	If missing
`Worker` + `Blob` + `URL.createObjectURL`	Worker isolation	Falls back to the identical main-thread implementation
`BroadcastChannel`	Multi-tab sync	Single-tab behaviour
`AbortSignal.any`	Combining timeout + user signal	Manual signal linking fallback
`localStorage` / `sessionStorage`	Persistent storage	Reads/writes become no-ops (Safari private mode is handled)

Module formats

Entry	File
ESM	`dist/index.js`
CJS	`dist/index.cjs`
Types (ESM)	`dist/index.d.ts`
Types (CJS)	`dist/index.d.cts`

// ESM / TypeScript / bundlers
import { createClient } from "@mrzr/api-client";

// CommonJS
const { createClient } = require("@mrzr/api-client");

<!-- No build step -->
<script type="module">
  import { createClient } from "https://esm.sh/@mrzr/api-client";
</script>

The package is marked "sideEffects": false, so bundlers tree-shake anything you don't import.

TypeScript setup

No extra @types package is needed. For the best experience use:

{
  "compilerOptions": {
    "moduleResolution": "bundler", // or "node16" / "nodenext"
    "lib": ["ES2020", "DOM", "DOM.Iterable"],
    "strict": true
  }
}

moduleResolution: "node" (the legacy default) also resolves correctly — the package exposes main/module/types alongside exports.

No configuration needed. On the server, worker mode disables itself automatically. In server components and route handlers, prefer creating a short-lived client and calling destroy() — see [[Framework Recipes]].

Vite / Nuxt / SvelteKit

No configuration needed. The worker is created from an inlined blob, so there is no worker file to host and no ?worker import to wire up.

Content Security Policy

Blob workers require worker-src blob: (or child-src blob:). If your CSP forbids it, the client catches the failure and silently runs on the main thread instead — nothing breaks, you just lose isolation. To be explicit about it, set worker: false.

Content-Security-Policy: worker-src 'self' blob:;

React Native

fetch and AbortController exist, so requests work. Worker, BroadcastChannel and localStorage do not — pass worker: false, multiTab: false, and a custom storage adapter backed by AsyncStorage or expo-secure-store.

Verifying the install

import { createClient } from "@mrzr/api-client";

const api = createClient({ baseUrl: "https://httpbin.org" });
console.log(api.isWorker);            // true in a browser, false on the server
console.log((await api.get("/get")).status); // true
api.destroy();

Next: [[Quick Start]]