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node_modules/headers-polyfill/README.md

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+[![Published version](https://img.shields.io/npm/v/headers-polyfill.svg)](https://www.npmjs.com/package/headers-polyfill)
+
+# `headers-polyfill`
+
+A `Headers` class polyfill and transformation library.
+
+## Motivation
+
+Various request issuing libraries utilize a different format of headers. This library chooses the [`Headers`](https://developer.mozilla.org/en-US/docs/Web/API/Headers) instance as the middle-ground between server and client, and provides functions to convert that instance to primitives and vice-versa.
+
+## Install
+
+```bash
+npm install headers-polyfill
+```
+
+## Polyfill
+
+This package exports the `Headers` class that polyfills the native [`window.Headers`](https://developer.mozilla.org/en-US/docs/Web/API/Headers) implementation. This allows you to construct and manage headers using the same API in non-browser environments.
+
+```js
+import { Headers } from 'headers-polyfill'
+
+const headers = new Headers({
+  Accept: '*/*',
+  'Content-Type': 'application/json',
+})
+
+headers.get('accept') // "*/*"
+```
+
+## Methods
+
+The `Headers` polyfill instance supports the same methods as the standard `Headers` instance:
+
+- [`.has()`](https://developer.mozilla.org/en-US/docs/Web/API/Headers/has)
+- [`.get()`](https://developer.mozilla.org/en-US/docs/Web/API/Headers/get)
+- [`.set()`](https://developer.mozilla.org/en-US/docs/Web/API/Headers/set)
+- [`.append()`](https://developer.mozilla.org/en-US/docs/Web/API/Headers/append)
+- [`.delete()`](https://developer.mozilla.org/en-US/docs/Web/API/Headers/delete)
+- [`.forEach()`](https://developer.mozilla.org/en-US/docs/Web/API/Headers/forEach)
+- [`.getSetCookie()`](https://developer.mozilla.org/en-US/docs/Web/API/Headers/getSetCookie)
+
+As well as the iterator methods:
+
+- [`.keys()`](https://developer.mozilla.org/en-US/docs/Web/API/Headers/keys)
+- [`.values()`](https://developer.mozilla.org/en-US/docs/Web/API/Headers/values)
+- [`.entries()`](https://developer.mozilla.org/en-US/docs/Web/API/Headers/entries)
+
+## Transformations
+
+### `getRawHeaders()`
+
+Returns an object consisting of the header name/value pairs but preserving raw header names.
+
+```js
+const headers = new Headers({
+  Accept: '*/*',
+  'Content-Type': 'application/json',
+})
+
+headers.raw()
+// { "Accept": "*/*", "Content-Type": "application/json" }
+```
+
+### Headers ⭢ N
+
+- `headersToString: (h: Headers): string`
+
+```js
+import { headersToString } from 'headers-polyfill'
+
+headersToString(
+  new Headers({
+    connection: 'keep-alive',
+    'content-type': ['text/plain', 'image/png'],
+  })
+)
+// connetion: keep-alive
+// content-type: text/plain, image/png
+```
+
+- `headersToList: (h: Headers): Array<[string, string | string[]]>`
+
+```js
+import { headersToList } from 'headers-polyfill'
+
+headersToList(
+  new Headers({
+    connection: 'keep-alive',
+    'content-type': ['text/plain', 'image/png'],
+  })
+)
+// [['connection', 'keep-alive'], ['content-type', ['text/plain', 'image/png']]]
+```
+
+- `headersToObject: (h: Headers): Record<string, string | string[]>`
+
+```js
+import { headersToObject } from 'headers-polyfill'
+
+headersToObject(
+  new Headers({
+    connection: 'keep-alive',
+    'content-type': ['text/plain', 'image/png'],
+  })
+)
+// { connection: 'keep-alive', 'content-type': ['text/plain', 'image/png'] }
+```
+
+### N ⭢ Headers
+
+- `stringToHeaders: (s: string): Headers`
+
+```js
+import { stringToHeaders } from 'headers-polyfill'
+
+
+const stringToHeaders(`
+connection: keep-alive
+content-type: text/plain, image/png
+`)
+// Headers { connection: 'keep-alive', 'content-type': ['text/plain', 'image/png'] }
+```
+
+- `listToHeaders: (l: Array<[string, string | string[]]>): Headers`
+
+```js
+import { listToHeaders } from 'headers-polyfill'
+
+listToHeaders([
+  ['connection', 'keep-alive'],
+  ['content-type', ['text/plain', 'image/png']],
+])
+// Headers { connection: 'keep-alive', 'content-type': ['text/plain', 'image/png'] }
+```
+
+- `objectToHeaders: (o: Record<string, string | string[] | undefined>): Headers`
+
+```js
+import { objectToHeaders } from 'headers-polyfill'
+
+objectToHeaders({
+  connection: 'keep-alive',
+  'content-type': ['text/plain', 'image/png'],
+})
+// Headers { connection: 'keep-alive', 'content-type': ['text/plain', 'image/png'] }
+```
+
+---
+
+## Utilities
+
+- `reduceHeadersObject: <R>(o: Record<string, string | string[]>, reducer: (acc: R, name: string, value: string | string[]) => R) => R`
+
+```js
+import { reduceHeadersObject } from 'headers-polyfill'
+
+reduceHeadersObject <
+  HeadersObject >
+  ({
+    Accept: '*/*',
+    'Content-Type': ['application/json', 'text/plain'],
+  },
+  (headers, name, value) => {
+    headers[name.toLowerCase()] = value
+    return headers
+  },
+  {})
+// { 'accept': '*/*', 'content-type': ['application/json', 'text/plain'] }
+```
+
+- `appendHeader: (o: Record<string, string | string[]>, n: string, v: string | string[]): Record<string, string | string[]>`
+
+```js
+import { appendHeader } from 'headers-polyfill'
+
+appendHeader(
+  { 'content-type': 'application/json' },
+  'content-type',
+  'text/plain'
+)
+// { 'content-type': ['application/json', 'text/plain']}
+```
+
+- `flattenHeadersList: (l: Array<[string, string | string[]]>): Array<string, string>`
+
+```js
+import { flattenHeadersList } from 'headers-polyfill'
+
+flattenHeadersList([['content-type', ['text/plain', 'image/png']]])
+// ['content-type', 'text/plain, image/png']
+```
+
+- `flattenHeadersObject: (o: Record<string, string | string[]>): Record<string, string>`
+
+```js
+import { flattenHeadersObject } from 'headers-polyfill'
+
+flattenHeadersObject({
+  'content-type': ['text/plain', 'image/png'],
+})
+// { 'content-type': 'text/plain, image/png' }
+```