initial commit: scaffolding

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diff --git a/node_modules/rxjs/src/internal/ajax/AjaxResponse.ts b/node_modules/rxjs/src/internal/ajax/AjaxResponse.ts
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+import { AjaxRequest, AjaxResponseType } from './types';
+import { getXHRResponse } from './getXHRResponse';
+
+/**
+ * A normalized response from an AJAX request. To get the data from the response,
+ * you will want to read the `response` property.
+ *
+ * - DO NOT create instances of this class directly.
+ * - DO NOT subclass this class.
+ *
+ * It is advised not to hold this object in memory, as it has a reference to
+ * the original XHR used to make the request, as well as properties containing
+ * request and response data.
+ *
+ * @see {@link ajax}
+ * @see {@link AjaxConfig}
+ */
+export class AjaxResponse<T> {
+  /** The HTTP status code */
+  readonly status: number;
+
+  /**
+   * The response data, if any. Note that this will automatically be converted to the proper type
+   */
+  readonly response: T;
+
+  /**
+   * The responseType set on the request. (For example: `""`, `"arraybuffer"`, `"blob"`, `"document"`, `"json"`, or `"text"`)
+   * @deprecated There isn't much reason to examine this. It's the same responseType set (or defaulted) on the ajax config.
+   * If you really need to examine this value, you can check it on the `request` or the `xhr`. Will be removed in v8.
+   */
+  readonly responseType: XMLHttpRequestResponseType;
+
+  /**
+   * The total number of bytes loaded so far. To be used with {@link total} while
+   * calculating progress. (You will want to set {@link includeDownloadProgress} or
+   * {@link includeDownloadProgress})
+   */
+  readonly loaded: number;
+
+  /**
+   * The total number of bytes to be loaded. To be used with {@link loaded} while
+   * calculating progress. (You will want to set {@link includeDownloadProgress} or
+   * {@link includeDownloadProgress})
+   */
+  readonly total: number;
+
+  /**
+   * A dictionary of the response headers.
+   */
+  readonly responseHeaders: Record<string, string>;
+
+  /**
+   * A normalized response from an AJAX request. To get the data from the response,
+   * you will want to read the `response` property.
+   *
+   * - DO NOT create instances of this class directly.
+   * - DO NOT subclass this class.
+   *
+   * @param originalEvent The original event object from the XHR `onload` event.
+   * @param xhr The `XMLHttpRequest` object used to make the request. This is useful for examining status code, etc.
+   * @param request The request settings used to make the HTTP request.
+   * @param type The type of the event emitted by the {@link ajax} Observable
+   */
+  constructor(
+    /**
+     * The original event object from the raw XHR event.
+     */
+    public readonly originalEvent: ProgressEvent,
+    /**
+     * The XMLHttpRequest object used to make the request.
+     * NOTE: It is advised not to hold this in memory, as it will retain references to all of it's event handlers
+     * and many other things related to the request.
+     */
+    public readonly xhr: XMLHttpRequest,
+    /**
+     * The request parameters used to make the HTTP request.
+     */
+    public readonly request: AjaxRequest,
+    /**
+     * The event type. This can be used to discern between different events
+     * if you're using progress events with {@link includeDownloadProgress} or
+     * {@link includeUploadProgress} settings in {@link AjaxConfig}.
+     *
+     * The event type consists of two parts: the {@link AjaxDirection} and the
+     * the event type. Merged with `_`, they form the `type` string. The
+     * direction can be an `upload` or a `download` direction, while an event can
+     * be `loadstart`, `progress` or `load`.
+     *
+     * `download_load` is the type of event when download has finished and the
+     * response is available.
+     */
+    public readonly type: AjaxResponseType = 'download_load'
+  ) {
+    const { status, responseType } = xhr;
+    this.status = status ?? 0;
+    this.responseType = responseType ?? '';
+
+    // Parse the response headers in advance for the user. There's really
+    // not a great way to get all of them. So we need to parse the header string
+    // we get back. It comes in a simple enough format:
+    //
+    // header-name: value here
+    // content-type: application/json
+    // other-header-here: some, other, values, or, whatever
+    const allHeaders = xhr.getAllResponseHeaders();
+    this.responseHeaders = allHeaders
+      ? // Split the header text into lines
+        allHeaders.split('\n').reduce((headers: Record<string, string>, line) => {
+          // Split the lines on the first ": " as
+          // "key: value". Note that the value could
+          // technically have a ": " in it.
+          const index = line.indexOf(': ');
+          headers[line.slice(0, index)] = line.slice(index + 2);
+          return headers;
+        }, {})
+      : {};
+
+    this.response = getXHRResponse(xhr);
+    const { loaded, total } = originalEvent;
+    this.loaded = loaded;
+    this.total = total;
+  }
+}