jQuery Mockjax: Ajax request mocking

http://github.com/jakerella/jquery-mockjax/

There are some minor breaking changes in v2, so if you need an older version, please check the v1.x branch or the list of releases in Github.

jQuery Mockjax provides request/response mocking for ajax requests using the jQuery API and provides all standard behaviors in the request/response flow.

You may report any issues you may find in the github issue tracking.

Table of Contents

About Mockjax and Its History
Basic Documentation
Detailed Request and Response Definition
Advanced Mocking Techniques
Miscellaneous Information

About Mockjax and Its History

Most backend developers are familiar with the concepts of mocking objects or stubbing in methods for unit testing. For those not familiar with mocking, it's the simulation of an interface or API for testing or integration development purposes. Mocking with front-end development though is still quite new. Mockjax gives front end developers the ability to define ajax requests that should be mocked out, as well as how those requests should be responded to. These mocks can be extremely simple or quite complex, representing the entire request-response workflow.

At appendTo we developed a lot of applications which use RESTFUL web services, but much of the time those services are not yet created. We spec out the service contract and data format at the beginning of a project and develop the front-end interface against mock data while the back end team builds the production services.

This plugin was originally developed by appendTo in March 2010 and the team has been using it in many projects since.

Basic Documentation

API Methods

Mockjax consists of just a few methods, each listed below. You'll find plenty of examples in the sections below, but if you're looking for a specific option, checkout this list:

Number $.mockjax(/* Object */ options)
- Sets up a mockjax handler for a matching request
- Returns that handler's index, can be used to clear individual handlers
- options: [Object] Defines the settings to use for the mocked request
  - url: [String | RegExp] Specifies the url of the request that the data should be mocked for. If it is a string and contains any asterisks ( * ), they will be treated as a wildcard by translating to a regular expression. Any * will be replaced with .+. If you run into trouble with this shortcut, switch to using a full regular expression instead of a string and asterisk combination
  - data: [Object | Function] In addition to the URL, match parameters
  - type: [String] Specify what HTTP method to match, usually GET or POST. Case-insensitive, so get and post also work
  - headers: [Object] Keys will be simulated as additional headers returned from the server for the request (NOTE: This is NOT used to match request headers!)
  - status: [Number] An integer that specifies a valid server response code. This simulates a server response code
  - statusText: [String] Specifies a valid server response code description. This simulates a server response code description
  - responseTime: [Number] An integer that specifies a simulated network and server latency (in milliseconds). Default is 500. Setting this to 0 will minimize the simulated latency
  - isTimeout: [Boolean] Determines whether or not the mock will force a timeout on the request
  - contentType: [String] Specifies the content type for the response
  - response: [Function] A function that accepts the request settings and allows for the dynamic setting of response settings (including the body of the response) upon each request (see examples below)
  - responseText: [String] Specifies the mocked text, or a mocked object literal, for the request
  - responseXML: [String] Specifies the mocked XML for the request
  - proxy: [String] Specifies a path to a file, from which the contents will be returned for the request
  - lastModified: [String] A date string specifying the mocked last-modified time for the request. This is used by $.ajax to determine if the requested data is new since the last request
  - etag: [String] Specifies a unique identifier referencing a specific version of the requested data. This is used by $.ajax to determine if the requested data is new since the last request. (see HTTP_ETag)
  - onAfterSuccess: [Function] A callback that will be called after the success method has been called, this is useful to check a condition after the call has been completed
  - onAfterError: [Function] A callback that will be called after the error method has been called, this is useful to check a condition after the call has been completed
  - onAfterComplete: [Function] Similar to onAfterSuccess, but will be executed after the complete method has been called
Object $.mockjax.handler(/* Number */ id)
- Returns the mock request settings for the handler with the provided id. Be careful here, you're accessing the inner workings of the plugin, any changes to this object could be bad.
Array $.mockjax.handlers()
- Returns the array of mock handlers. NOTE: This array is NOT modified when a handler is cleared, the cleared handler position is simply set to null. As such, the array length will only change when new mocks are added. Be careful here, you're accessing the inner workings of the plugin, any changes to the array could be very bad.
void $.mockjax.clear([/* Number || String */ identifier])
- If the identifier provided is a Number, the handler with that ID is cleared (that is, requests matching it will no longer do so, the handler is completely removed)
- If the identifier provided is a String, the handler with that matching URL is cleared.
- If no identifier is provided, ALL handlers are cleared, resetting Mockjax to its initial state
Array<Object> $.mockjax.mockedAjaxCalls()
- Returns an array of all mocked ajax calls with each entry being the request settings object as passed into the $.mockjax() function
- If `$.mockjaxSettings.retainAjaxCalls is set to false, this will always be empty
Array<Object> $.mockjax.unfiredHandlers()
- Returns an array of all mock handler settings that have not been used. In other words, if a handler has been used for a $.ajax() call then it will not appear in this array
Array<Object> $.mockjax.unmockedAjaxCalls()
- Returns an array of all unmocked Ajax calls that were made. The array contains the settings object passed into $.ajax({...})
- If `$.mockjaxSettings.retainAjaxCalls is set to false, this will always be empty
void $.mockjax.clearRetainedAjaxCalls()
- Empties the arrays returned by $.mockjax.mockedAjaxCalls and $.mockjax.unmockedAjaxCalls

Overview: Your First Mock

Our first example will be for a simple REST service for a fortune app with the REST endpoint being /restful/fortune which returns the following JSON message:

{
    "status": "success",
    "fortune" : "Are you a turtle?"
}

To pull the fortune into our page, we'd use the following HTML and jQuery code:

<!DOCTYPE html>
<html>
  <head>
    <title>Fortune App</title>
    <script src="http://code.jquery.com/jquery-1.11.1.min.js"></script>
  </head>
<body>
  <div id="fortune"></div>
</body>
</html>

$.getJSON("/restful/fortune", function(response) {
  if ( response.status == "success") {
    $("#fortune").html( "Your fortune is: " + response.fortune );
  } else {
    $("#fortune").html( "Things do not look good, no fortune was told" );
  }
});

At this point if we were to run this code it would fail since the REST service has yet to be implemented. This is where the benefit of the Mockjax plugin starts to pay off. The first step in using Mockjax is to include the plugin by just adding a regular script tag:

<head>
  ...
  <script src="vendor/jquery.mockjax.js"></script>
</head>

Once you have that included, you can start intercepting Ajax requests and mocking the responses. So let's mock out the service by including the following code:

$.mockjax({
  url: "/restful/fortune",
  responseText: {
    status: "success",
    fortune: "Are you a mock turtle?"
  }
});

Defining a JSON string inline requires a JSON.stringify() method to be available. For some browsers you may need to include json2.js, which is included in the lib folder. However, you could also simply provide an already stringified version of your JSON in the responseText property.

If you plan on mocking xml responses, you may also have to include jquery.xmldom.js, which can also be found in the lib folder.

Mockjax in Depth

What Mockjax does at this point is replace the $.ajax() method with a wrapper that transparently checks the URL being requested. If the URL matches one defined by $.mockjax(), it intercepts the request and sets up a mock XMLHttpRequest object before executing the jQuery.ajax() handler. Otherwise, the request is handed back to the native $.ajax() method for normal execution. One benefit in this implementation detail is that by simulating the XMLHttpRequest object, the plugin continues to make use of jQuery's native ajax handling, so there are no concerns with implementing a custom Ajax workflow.

As you write code to mock responses, there's great value in the fact that there are no modifications required to production code. The mocks can be transparently inserted. This provides easy integration into most frameworks by including the plugin and mock definitions through your build framework. It's also possible to include it at run time by listening for a query string flag and injecting the plugin and definitions.

Now let's look at the various approaches to defining mocks as offered by the plugin. The sections below feature an extensive overview of the flexibility in Mockjax and creating responses.

Data Types Available for Mocking

jQuery is able to handle and parse Text, HTML, JSON, JSONP, Script and XML data formats and Mockjax is able to mock any of those formats. Two things to note: depending upon how you mock out JSON and JSONP you may need to include json2.js for the JSON.stringify() method (older browsers only, typically). Additionally if you mock XML inline, you'll need to include the xmlDOM plugin that transforms a string of XML into a DOM object. However, if you use the proxy approach outlined below then there should be no need to include either the JSON or XMLDOM plugins in any case.

Detailed Request and Response Definition

Defining a Request to Match

The first thing you need to do when mocking a request is define the URL end-point to intercept and mock. As with our example above this can be a simple string:

$.mockjax({
  url: "/url/to/rest-service"
});

or contain a * as a wildcard:

$.mockjax({
  // Matches /data/quote, /data/tweet etc.
  url: "/data/*"
});

or a full regular expression:

$.mockjax({
  // Matches /data/quote, /data/tweet but not /data/quotes
  url: /^\/data\/(quote|tweet)$/i
});

You can also match against the data option in addition to url:

$.mockjax({
  url:  "/rest",
  data: { action: "foo" }
});

The data option may be a custom matching function returning true of false whether the data is expected or not:

$.mockjax({
  url: "/rest",
  data: function( data ) {
    return deepEqual( data, expected );
  }
});

The data function is a recommended place for assertions. Return true and let a testing framework of choice do the rest:

$.mockjax({
  url: "/rest",
  data: function ( json ) {
    assert.deepEqual( JSON.parse(json), expected ); // QUnit example.
    return true;
  }
});

To capture URL parameters, use a capturing regular expression for the URL and a urlParams array to indicate, ordinally, the names of the paramters that will be captured:

$.mockjax({
  // matches /author/{any number here}/isbn/{any number with dashes here}
  // for example: "/author/1234/isbn/1234-5678-9012-0"
  url: /^\/author\/([\d]+)\/isbn\/([\d\-]+)$/,
  // names of matching params
  urlParams: ["authorID", "isbnNumber"],
  response: function (settings) {
    var authorID = settings.urlParams.authorID;
    var isbnNumber = settings.urlParams.isbnNumber;
    // etc...
  }
});

Defining Multiple Requests

Since version 2.2 it is allowed to define several requests at once. $.mockjax([...]) returns a array of handlers' indexes. It is possible to reset handler by index. Read more in Removing Mockjax Handlers.

var handlers = $.mockjax([
  {url: '/rest', responseText: 'one'},
  {url: '/rest', responseText: 'two'}
]);

$.mockjax.clear(handlers[0]);

Defining a Response

The second step is to define the type and content of the response. The two main properties you will be dealing with are either responseText or responseXML. These properties mirror the native XMLHttpRequest object properties that are set during a live response. There are three different patterns for specifying the responses: Inline, Proxy, and Callback.

Inline Responses

A simple text response would be:

$.mockjax({
  url: "/restful/api",
  responseText: "A text response from the server"
});

A simple JSON response would be:

$.mockjax({
  url: "/restful/api",
  // You may need to include the [json2.js](https://raw.github.com/douglascrockford/JSON-js/master/json2.js) library for older browsers
  responseText: { "foo": "bar" }
});

Also note that a JSON response is really just a text response that jQuery will parse as JSON for you (and return a JSON object to the success and complete callbacks).

A simple XML response would be:

$.mockjax({
  url: "/restful/api",
  // Need to include the xmlDOM plugin to have this translated into a DOM object
  responseXML: "<document><quote>Hello world!</quote></document>"
});

As you can see, if you have a significant amount of data being mocked this becomes unwieldy. So that brings us to the next pattern: the proxy.

Proxy

In this example below, the Mockjax plugin will intercept requests for /restful/api and redirect them to /mocks/data.json:

$.mockjax({
  url: "/restful/api",
  proxy: "/mocks/data.json"
});

The /mocks/data.json file can have any valid JSON content you want, and allows you to maintain that mock data in its own file for maintainability.

Note: If you're testing your code with a poxy, it is best to run an actual web server for the tests. Simply loading test/index.html from the file system may result in the proxy file not being loaded correctly. We recommend using something like the http-server npm module.

Callback

In the final response pattern, we can define a callback function on the response property and have it set responseText or responseXML as needed:

$.mockjax({
  url: "/restful/api",
  response: function(settings) {
    // Investigate the `settings` to determine the response...

    this.responseText = "Hello world!";
  }
});

The default version of this callback is synchronous. If you provide both parameters to the callback function, you can use asynchronous code to set the dynamic response.

$.mockjax({
  url: '/restful/api',
  response: function(settings, done) {
    var self = this;
    someAsyncMethod(function(data){
      self.responseText = data;
      done();
    });
  }
});

Note that the callback is given the settings provided to the $.mockjax({...}) method merged with any Ajax settings defined by jQuery or your application. This allows you to thoroughly investigate the request before setting the response body (or headers).

Advanced Mocking Techniques

At this point we've looked at a series of basic mocking techniques with Mockjax and will now unpack some of the additional functionality contained in the plugin.

Simulating Response Time and Latency

Simulating network and server latency for a mock is as simple as adding a responseTime property to your mock definition:

$.mockjax({
  url: "/restful/api",
  // Simulate a network latency of 750ms
  responseTime: 750,
  responseText: "A text response from the server"
});

You can also use an interval for responseTime to randomize latency:

$.mockjax({
  url: "/restful/api",
  // Use a random value between 250ms and 750ms
  responseTime: [250, 750],
  responseText: "A text response from the server"
});

Simulating HTTP Response Statuses

It's also possible to simulate response statuses other than 200 (default for Mockjax) by simply adding a status property.

$.mockjax({
  url: "/restful/api",
  // Server 500 error occurred
  status: 500,
  responseText: "A text response from the server"
});

The ability to provide an array of possible response statuses (from which the response for a given request will be randomly picked from):

// Randomly fail
$.mockjax({
  url: "/restful/api",
  status: [200,400,500]
});

// Randomly fail (with a preference towards success)
$.mockjax({
  url: "/restful/api",
  status: [200,400,200,500,200]
});

These forced error status codes will be handled just as if the server had returned the error: the error callback will get executed with the proper arguments.

Setting the Content-Type

You can set the content type to associate with the mock response, in the example below, we're setting a JSON content type.

$.mockjax({
  url: "/restful/api",
  contentType: "application/json",
  responseText: {
    hello: "World!"
  }
});

Setting Additional HTTP Response Headers

Additional HTTP Response Headers may be provided by setting a key in the headers object literal:

$.mockjax({
  url: "/restful/api",
  contentType: "application/json",
  responseText: {
    hello: "World!"
  },
  headers: {
    etag: "xyz123"
  }
});

Dynamically Generating Mock Definitions

In some situations, all of your REST calls are based upon a URL schema. Mockjax has the ability for you to specify a callback function that is handed the $.ajax request settings. The callback function may then either return false to allow the request to be handled natively, or return an object literal with relevant Mockjax parameters set. Below is an example that rewrites all Ajax requests to proxy to static mocks:

$.mockjax(function(settings) {

  // settings.url might be: "/restful/<service>" such as "/restful/user"

  var service = settings.url.match(/\/restful\/(.*)$/);
  if ( service ) {
    return {
      proxy: "/mocks/" + service[1] + ".json"
    };
  }
  // If you get here, there was no url match
  return;
});

Accessing Request Headers

In some situations, you may need access to the request headers to determine matching or response bodies. To do this, you will need to specify a callback function that is handed the $.ajax request settings:

$.mockjax(function( requestSettings ) {
  // Here is our manual URL matching...
  if ( requestSettings.url === "/restful/user" ) {
    // We have a match, so we return a response callback...
    return {
      response: function( origSettings ) {

      	// now we check the request headers, which may be set directly
      	// on the xhr object through an ajaxSetup() call or otherwise:

      	if ( requestSettings.headers["Authentication"] === "some-token" ) {
      	  this.responseText = { user: { id: 13 } };
      	} else {
  		  this.status = 403;
  		  this.responseText = "You are not authorized";
        }
      }
    };
  }
  // If you get here, there was no url match
  return;
});

Forced Simulation of Server Timeouts

Because of the way Mockjax was implemented, it takes advantage of jQuery's internal timeout handling for requests. But if you'd like to force a timeout for a request you can do so by setting the isTimeout property to true:

$.mockjax({
  url: '/restful/api',
  responseTime: 1000,
  isTimeout: true
});

Dynamically Generating Mock Responses

It's also possible to dynamically generate the response text upon each request by implementing a callback function on the response parameter:

$.mockjax({
  url: "/restful/webservice",
  dataType: "json",
  response: function(settings) {
    this.responseText = {
      randomText: "random " + Math.random()
    };
  }
});

Data Types

Many of the examples above mock a json response. You can also mock xml:

$.mockjax({
  url: "/some/xml",
  dataType: "xml",
  responseXML: "<document><say>Hello world XML</say></document>"
});

(Don't forget that it's likely you'll need the xmlDOM library as well!)

And html:

$.mockjax({
  url: "/some/webservice",
  dataType: "html",
  responseText: "<div>Hello there</div>"
});

Performing Actions After Request Completion

If you need to perform some actions after a call has completed you can use one of the onAfter{Xxxxx} options. For example, to fire a method when a request completes (either successfully or not):

$.mockjax({
  url: "/api/end/point",
  onAfterComplete: function() {
    // do any required cleanup
  }
});

Globally Defining Mockjax Settings

It is also possible to define the global defaults for all Mockjax requests by overwriting the $.mockjaxSettings object. By default the settings are as follows:

{
  log:             null,  // DEPRECATED, use $.mockjaxSettings.logger instead
  logger:          window.console,
  logging:         2,
  logLevelMethods: ['error', 'warn', 'info', 'log', 'debug'],
  namespace:       null,
  status:          200,
  statusText:      "OK",
  responseTime:    500,
  isTimeout:       false,
  throwUnmocked:   false,
  retainAjaxCalls: true,
  contentType:     "text/plain",
  response:        "",
  responseText:    "",
  responseXML:     "",
  proxy:           "",
  proxyType:       "GET",
  lastModified:    null,
  etag:            "",
  headers: {
    etag: "IJF@H#@923uf8023hFO@I#H#",
    "content-type" : "text/plain"
  }
}

To overwrite a particular settings such as the default content-type, you would do the following:

$.mockjaxSettings.contentType = "application/json";

Setting a Global URL Namespace

The namespace option in $.mockjaxSettings allows you to apply a prefix to all of your mocked urls, such as /api/v1.

$.mockjaxSettings.namespace = "/api/v1";

Then the following mock will match /api/v1/rest:

$.mockjax({
    url: "/rest"
})

As will the following RegExp pattern:

$.mockjax({
    url: /^\/rest$/
})

The global namespace option can also be overwritten on a particular mock.

$.mockjax({
    url: "/rest-2",
    namespace: null
})

Note that the namespace prefix does not apply to proxies.

Globally defining match order

By default, Mockjax matches requests in registration order (mockjax considers the handlers registered first before handlers registered last). To reverse this behavior:

$.mockjaxSettings.matchInRegistrationOrder = false;

Setting matchInRegistrationOrder to false lets you override previously defined handlers. Suppose you had:

$.mockjax({
    url: "/rest",
    responseText: "hello"
});
$.mockjax({
    url: "/rest",
    responseText: "byebye"
});

The default behavior is that Mockjax returns "hello", but with matchInRegistrationOrder set to false, Mockjax would return "byebye".

This behavior allows you to override older handlers after they are initially set.

Removing Mockjax Handlers

If you need to reset the Mockjax handlers you've added, just call $.mockjax.clear(). This will NOT reset the $.mockjaxSettings!

$.mockjax.clear();

You can also clear individual mock handlers using their ID:

var id = $.mockjax({
   ...
});

$.mockjax.clear(id);

Or you can clear a handler by the URL that it matches with either a String or RegExp:

$.mockjax({
   url: "/api/foo",
   ...
});

$.mockjax.clear("/api/foo");
// or
$.mockjax.clear(/foo/);

Miscellaneous Information

jQuery Version Support

We strive to ensure that Mockjax is tested on the furthest patch version of all minor versions of jQuery (1.x.y through 3.x.y). In other words, we don't test 1.12.1, but rather 1.12.4 (the furthest patch version on the 1.x line). The QUnit tests in the /test directory include links to each version of jQuery tested in the header.

Browsers Tested

We use BrowserStack's awesome open source collaboration to test Mockjax in real browsers using VMs on their platform. We run all of our tests on the current versions of the major browsers below, plus the specific versions of Internet Explorer specified.

Edge
Firefox
Chrome
Safari

Each PR will run these tests using TravisCI for continuous integration before code is merged into master to ensure we do not introduce regressions.

Using Mockjax in Other Ways

You can use Mockjax as a Node module or with Browserify... and presumably in other ways as well. We have tests for each of the methods above.

When using Mockjax as a Node module (including with Browserify), you must provide the module with the jQuery library and a window. Here is an example using a module intended for use as a "browserified" module:

var jquery = require('jquery');
var mockjax = require('jquery-mockjax')(jquery, window);
// Note that we expect `window` to be defined once this file is browserified and
// used in a browser. If it isn't Mockjax will have a problem!

mockjax({
    url: '/resource',
    responseText: 'content'
});

function getResource(cb) {
    jquery.ajax({
        url: '/resource',
        success: cb,
        error: cb
    });
}

Logging

Mockjax logs various pieces of information to the console (on window) in browsers, or to stdout in Node). You can customize various aspects of the logging to suit your needs. By default, only 'error', 'warn' or 'info' messages will be shown, but detailed information may be available in debug logs. Below are some common things you might need to do to get better logging information.

Show different levels of log messages

$.mockjaxSettings.logging = 4;  // very verbose debug messages
$.mockjaxSettings.logging = 3;  // verbose log messages
$.mockjaxSettings.logging = 2;  // informational messages
$.mockjaxSettings.logging = 1;  // warning messages
$.mockjaxSettings.logging = 0;  // only critical error messages

(Note that each level enables that level plus any lower number... thus setting logging to 2 also enables warnings and errors.)

Implement a custom logger

If you don't want to use the console object, you can pass in your own logging implementation with the logger setting. Note that your logger must either implement the debug, log, info, warn, and error methods, or you must also provide what methods map to the 5 levels (0 through 4).

$.mockjaxSettings.logger = {
  debug: function() { ... },
  log: function() { ... },
  // ...
};

Your logger methods may receive any number of arguments to log out, either as strings or objects, similar to how the window.console object methods work.

If you have a logger that uses different methods names, specify them in this array:

$.mockjaxSettings.logLevelMethods = ['critical', 'bad', 'stuff', 'log', 'verbose'];

Note that the first entry in this array (index 0) will be errors while the last entry will be verbose output. Anything beyond index 4 will be ignored.

What about the old `log` setting?

This was an undocumented feature whereby you could provide a log method using $.mockjaxSettings, however, it is no longer used internally. This undocumented option is now deprecated, and while it will work, log messages of ALL levels will be sent to it.

If you have no idea what we're talking about... good! Don't worry about it. The proper way to implement your own logger is via $.mockjaxSettings.logger.

Release History

Please read the CHANGELOG for a list of changes per release.

Note that all releases are tagged in Github for easy reference, the master branch should not be considered a stable release!

License

NOTE: This repository was taken over by Jordan Kasper (@jakerella) October, 2014

Licensed under the MIT license: http://opensource.org/licenses/MIT

Troubleshooting

If mockjax appears to be behaving unexpectedly, be sure to check the console logs for warnings.

Contributing

We welcome any contributions by the community, whether in the form of a Pull Request, issue submission and comments, or just sharing on social media!

If you want to contribute code to the project, please read our Contribution guidelines to see what you need to do to get your Pull Request ready for merging.

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CHANGELOG.md		CHANGELOG.md
CONTRIBUTING.md		CONTRIBUTING.md
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LICENSE		LICENSE
README.md		README.md
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jQuery Mockjax: Ajax request mocking

About Mockjax and Its History

Basic Documentation

API Methods

Overview: Your First Mock

Mockjax in Depth

Data Types Available for Mocking

Detailed Request and Response Definition

Defining a Request to Match

Defining Multiple Requests

Defining a Response

Inline Responses

Proxy

Callback

Advanced Mocking Techniques

Simulating Response Time and Latency

Simulating HTTP Response Statuses

Setting the Content-Type

Setting Additional HTTP Response Headers

Dynamically Generating Mock Definitions

Accessing Request Headers

Forced Simulation of Server Timeouts

Dynamically Generating Mock Responses

Data Types

Performing Actions After Request Completion

Globally Defining Mockjax Settings

Setting a Global URL Namespace

Globally defining match order

Removing Mockjax Handlers

Miscellaneous Information

jQuery Version Support

Browsers Tested

Using Mockjax in Other Ways

Logging

Show different levels of log messages

Implement a custom logger

What about the old log setting?

Release History

License

Troubleshooting

Contributing

About

Resources

License

Security policy

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Watchers

Forks

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What about the old `log` setting?

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