Revert "Change request/error handling"

This reverts commit f22e90f.
This reverts commit defd6aa.

CHANGELOG.md

@@ -16,59 +16,6 @@ This driver uses semantic versioning:
 
 ## [Unreleased]
 
-### Changed
-
-- Errors encountered before a request completes are now wrapped in a
-  `NetworkError` or a subclass thereof
-
-  This should help making it easier to diagnose network issues and distinguish
-  the relevant error conditions.
-
-  The originating error can still be accessed using the `cause` property of the
-  `NetworkError` error.
-
-- `HttpError` now extends the `NetworkError` class
-
-  This allows treating all non-`ArangoError` errors as one category of errors,
-  even when there is no server response available.
-
-- `db.waitForPropagation` now throws a `PropagationTimeoutError` error when
-  invoked with a `timeout` option and the timeout duration is exceeded
-
-  The method would previously throw the most recent error encountered while
-  waiting for replication. The originating error can still be accessed using
-  the `cause` property of the `PropagationTimeoutError` error.
-
-- `db.waitForPropagation` now respects the `timeout` option more strictly
-
-  Previously the method would only time out if the timeout duration was
-  exceeded after the most recent request failed. Now the timeout is
-  recalculated and passed on to each request, preventing it from exceeding
-  the specified duration.
-
-  If the propagation timed out due to an underlying request exceeding the
-  timeout duration, the `cause` property of the `PropagationTimeoutError`
-  error will be a `ResponseTimeoutError` error.
-
-- `config.beforeRequest` and `config.afterResponse` callbacks can now return
-  promises
-
-  If the callback returns a promise, it will be awaited before the request
-  and response cycle proceeds. If either callback throws an error or returns
-  a promise that is rejected, that error will be thrown instead.
-
-- `config.afterResponse` callback signature changed
-
-  The callback signature previously used the internal `ArangojsResponse` type.
-  The new signature uses the `Response` type of the Fetch API with an
-  additional `request` property to more accurately represent the actual value
-  it receives as the `parsedBody` property will never be present.
-
-- `response` property on `ArangoError` is now optional
-
-  This property should always be present but this allows using the error in
-  situations where a response might not be available.
-
 ### Added
 
 - Added `database.availability` method
@@ -79,67 +26,6 @@ This driver uses semantic versioning:
 
 - Added `database.supportInfo` method
 
-- Added `onError` option to `Config` (DE-955)
-
-  This option can be used to specify a callback function that will be invoked
-  whenever a request results in an error. Unlike `afterResponse`, this callback
-  will be invoked even if the request completed but returned an error status.
-  In this case the error will be the `HttpError` or `ArangoError` representing
-  the error response.
-
-  If the `onError` callback throws an error or returns a promise that is
-  rejected, that error will be thrown instead.
-
-- Added `NetworkError` class
-
-  This is the common base class for all errors (including `HttpError`) that
-  occur while making a request. The originating error can be accessed using the
-  `cause` property. The request object can be accessed using the `request`
-  property.
-
-  Note that `ArangoError` and the new `PropagationTimeoutError` error type
-  do not extend `NetworkError` but may wrap an underlying error, which can
-  be accessed using the `cause` property.
-
-- Added `ResponseTimeoutError` class
-
-  This error extends `NetworkError` and is thrown when a request deliberately
-  times out using the `timeout` option.
-
-- Added `RequestAbortedError` class
-
-  This error extends `NetworkError` and is thrown when a request is aborted
-  by using the `db.close` method.
-
-- Added `FetchFailedError` class
-
-  This error extends `NetworkError` and is thrown when a request fails because
-  the underlying `fetch` call fails (usually with a `TypeError`).
-
-  In Node.js the root cause of this error (e.g. a network failure) can often be
-  found in the `cause` property of the originating error, i.e. the `cause`
-  property of the `cause` property of this error.
-
-  In browsers the root cause is usually not exposed directly but can often
-  be diagnosed by examining the developer console or network tab.
-
-- Added `PropagationTimeoutError` class
-
-  This error does not extend `NetworkError` but wraps the most recent error
-  encountered while waiting for replication, which can be accessed using the
-  `cause` property. This error is only thrown when `db.waitForPropagation`
-  is invoked with a `timeout` option and the timeout duration is exceeded.
-
-- Added `ProcessedResponse` type
-
-  This type replaces the previously internal `ArangojsResponse` type and
-  extends the native `Response` type with additional properties.
-
-- Added optional `ArangoError#request` property
-
-  This property is always present if the error has a `response` property. In
-  normal use this should always be the case.
-
 - Added `keepNull` option to `CollectionInsertOptions` type (DE-946)
 
   This option was previously missing from the type.

README.md

@@ -139,42 +139,21 @@ and [the `db` object](https://www.arangodb.com/docs/stable/appendix-references-d
 
 ## Error responses
 
-If the server returns an ArangoDB error response, arangojs will throw an
-`ArangoError` with an `errorNum` property indicating the ArangoDB error code
-and expose the response body as the `response` property of the error object.
+If arangojs encounters an API error, it will throw an `ArangoError` with
+an `errorNum` property indicating the ArangoDB error code and the `code`
+property indicating the HTTP status code from the response body.
 
-For all other errors during the request/response cycle, arangojs will throw a
-`NetworkError` or a more specific subclass thereof and expose the originating
-request object as the `request` property of the error object.
+For any other non-ArangoDB error responses (4xx/5xx status code), it will throw
+an `HttpError` error with the status code indicated by the `code` property.
 
-If the server responded with a non-2xx status code, this `NetworkError` will
-be an `HttpError` with a `code` property indicating the HTTP status code of the
-response and a `response` property containing the response object itself.
+If the server response did not indicate an error but the response body could
+not be parsed, a regular `SyntaxError` may be thrown instead.
 
-If the error is caused by an exception, the originating exception will be
-available as the `cause` property of the error object thrown by arangojs. For
-network errors, this will often be a `TypeError`.
+In all of these cases the server response object will be exposed as the
+`response` property on the error object.
 
-### Node.js network errors
-
-In Node.js, network errors caused by a `TypeError` will often have a `cause`
-property containing a more detailed exception.
-
-Specifically, these are often either system errors (represented by regular
-`Error` objects with additional properties) or errors from the `undici` module
-Node.js uses internally for its native `fetch` implementation.
-
-Node.js system error objects provide a `code` property containing the specific
-string error code, a `syscall` property identifying the underlying system call
-that triggered the error (e.g. `connect`), as well as other helpful properties.
-
-For more details on Node.js system errors, see the Node.js documentation of the
-[`SystemError` interface](https://nodejs.org/api/errors.html#class-systemerror)
-as well as the section on
-[Node.js error codes](https://nodejs.org/api/errors.html#nodejs-error-codes).
-
-For more details on the errors thrown by `undici`, see the
-[undici errors documentation](https://undici.nodejs.org/#/docs/api/Errors.md).
+If the request failed at a network level or the connection was closed without
+receiving a response, the underlying system error will be thrown instead.
 
 ## Common issues
 
@@ -191,15 +170,6 @@ Additionally please ensure that your version of Node.js (or browser) and
 ArangoDB are supported by the version of arangojs you are trying to use. See
 the [compatibility section](#compatibility) for additional information.
 
-You can install an older version of arangojs using `npm` or `yarn`:
-
-```sh
-# for version 8.x.x
-yarn add arangojs@8
-# - or -
-npm install --save arangojs@8
-```
-
 ### No code intelligence when using require instead of import
 
 If you are using `require` to import the `arangojs` module in JavaScript, the