Headers

For more information, see MDN.

export type HeadersInit = [string, string][] | Record<string, string> | Headers;

export class Headers {
  private [NORMALIZED_HEADERS];
  private [RAW_HEADER_NAMES];
  constructor(init?: HeadersInit);
  /**
   * Appends a new value onto an existing header inside a `Headers` object, or adds the header if it
   * does not already exist.
   */
  append(name: string, value: string): void;
  /** Deletes a header from the `Headers` object. */
  delete(name: string): void;
  /** Returns a `ByteString` sequence of all the values of a header with a given name. */
  get(name: string): string | null;
  /** Returns an array containing the values of all Set-Cookie headers associated with a response */
  getSetCookie(): string[];
  /** Returns a boolean stating whether a `Headers` object contains a certain header. */
  has(name: string): boolean;
  /**
   * Sets a new value for an existing header inside a `Headers` object, or adds the header if it
   * does not already exist.
   */
  set(name: string, value: string): void;
  /** Traverses the `Headers` object, calling the given callback for each header. */
  forEach<ThisArg = this>(
    callback: (this: ThisArg, value: string, name: string, parent: this) => void,
    thisArg?: ThisArg,
  ): void;
  keys(): IterableIterator<string>;
  values(): IterableIterator<string>;
  entries(): IterableIterator<[string, string]>;
  [Symbol.iterator](): IterableIterator<[string, string]>;
  /** Convert the Headers object to a plain object. */
  toObject(): Record<string, string>;
}