---
description: "Contentstack CDA SDK patterns in src/core (Content Delivery API)"
globs: ["src/**/*.js"]
alwaysApply: false
---

# Contentstack CDA SDK (`src/core/`)

This package implements the **Content Delivery API (CDA)** read client, not the Content Management API (CMA).

## Stack & config

- **`Contentstack.Stack(options)`** (`src/core/stack.js`) — **`api_key`**, **`delivery_token`**, **`environment`**; optional **`region`**, **`branch`**, **`host`**, **`live_preview`**, **`plugins`**, **`fetchOptions`** (timeout, retries, `retryCondition`, `logHandler`, etc.).
- Default CDN paths and version come from **`config.js`** at the repo root; regional hosts follow existing `stack.js` logic (e.g. `{region}-cdn.contentstack.com`).

## HTTP & errors

- Requests are built in **`src/core/lib/request.js`**: query serialization, **`fetch`**, default retries on **408** / **429** (configurable), plugin hooks **`onRequest`** / **`onResponse`**.
- Failed responses reject with objects carrying **`error_message`**, **`error_code`**, **`errors`**, **`status`**, **`statusText`** when JSON parsing succeeds — keep new code compatible with this shape.

## Modules

- **Entry, Query, Assets, Taxonomy, Result**, etc. live under **`src/core/modules/`** — follow neighboring patterns for chaining, parameters, and URL assembly.
- **Cache**: policies and providers under **`src/core/cache.js`** and **`src/core/cache-provider/`**.

## Live preview

- When **`live_preview.enable`** is true, **`management_token`** vs **`preview_token`** affect host selection — mirror existing `stack.js` behavior and tests under **`test/live-preview/`**.

## Runtime targets

- **`src/runtime/node|web|react-native|nativescript/`** supply **`http`** and **`localstorage`** — changes that affect networking or storage must consider **all** bundled targets.

## Docs

- Align behavior with the official [Content Delivery API](https://www.contentstack.com/docs/developers/apis/content-delivery-api/) documentation.