### Start Test Server

Source: https://github.com/jquery/jquery-migrate/blob/main/CONTRIBUTING.md

Launch the local test server to run the jQuery Migrate test suite in a browser.

```bash
npm run test:server
```

--------------------------------

### Install Dependencies

Source: https://github.com/jquery/jquery-migrate/blob/main/CONTRIBUTING.md

Install all necessary project dependencies using npm.

```bash
npm install
```

--------------------------------

### Run Tests with npm Test Server

Source: https://github.com/jquery/jquery-migrate/blob/main/README.md

Start a local test server and access tests via a web browser. Open http://localhost:3000/test/ in your browser.

```sh
$ npm run test:server
```

--------------------------------

### Clone and Build jQuery Migrate

Source: https://github.com/jquery/jquery-migrate/blob/main/README.md

Clone the repository, navigate into the directory, install dependencies, and build the project using npm.

```sh
$ git clone git://github.com/jquery/jquery-migrate.git
$ cd jquery-migrate
$ npm install
$ npm run build
```

--------------------------------

### Initialize jQuery Migrate with Old jQuery

Source: https://github.com/jquery/jquery-migrate/blob/main/test/data/core-jquery3.html

This snippet demonstrates the setup for testing jQuery Migrate with an older jQuery version. It uses jQuery.noConflict() to ensure proper initialization.

```javascript
jQuery.noConflict();
TestManager.loadProject( "jquery-migrate", "dev", true ); // Should have logged during initialization
startIframeTest();
```

--------------------------------

### View Test Suite Help

Source: https://github.com/jquery/jquery-migrate/blob/main/CONTRIBUTING.md

Access the full help documentation for the test suite to explore advanced command-line options.

```bash
npm run test:unit -- --help
```

--------------------------------

### Prepare Tests from Command Line

Source: https://github.com/jquery/jquery-migrate/blob/main/CONTRIBUTING.md

Prepare the test environment before running the test suite from the command line.

```bash
npm run pretest
```

--------------------------------

### Run Unit Tests from Command Line

Source: https://github.com/jquery/jquery-migrate/blob/main/CONTRIBUTING.md

Execute the unit test suite directly from the command line, with results reported in the terminal.

```bash
npm run test:unit
```

--------------------------------

### Run Tests with npm

Source: https://github.com/jquery/jquery-migrate/blob/main/README.md

Execute the test suite using the npm test command.

```sh
$ npm test
```

--------------------------------

### Navigate to Project Directory

Source: https://github.com/jquery/jquery-migrate/blob/main/CONTRIBUTING.md

Change your current directory to the cloned jQuery Migrate project folder.

```bash
cd jquery-migrate
```

--------------------------------

### Load Projects and Bind Ready Event

Source: https://github.com/jquery/jquery-migrate/blob/main/test/data/event-ready.html

Loads the necessary jQuery and jQuery-Migrate projects and binds a handler to the document's 'ready' event. This handler is expected to trigger a warning from jQuery Migrate.

```javascript
TestManager.loadProject( "jquery", "git" );
jQuery.noConflict();
TestManager.loadProject( "jquery-migrate", "dev", true );
// This should warn when the handler runs
jQuery( document ).on( "ready", function() {
  startIframeTest();
} );
```

--------------------------------

### Build jQuery Migrate Files

Source: https://github.com/jquery/jquery-migrate/blob/main/CONTRIBUTING.md

Compile all jQuery Migrate files for development and testing.

```bash
npm run build
```

--------------------------------

### Load jQuery Migrate Project and Run Tests

Source: https://github.com/jquery/jquery-migrate/blob/main/test/index.html

Loads the jQuery and jQuery-migrate projects and then initiates the test suite. Ensure jQuery.noConflict() is called before loading migrate to avoid namespace collisions.

```javascript
TestManager.loadProject( "jquery", "git.min" ); // Close this script tag so file will load
jQuery.noConflict();
TestManager.loadProject( "jquery-migrate", "min", true );
TestManager.loadTests();
```

--------------------------------

### Clone jQuery Migrate Repository

Source: https://github.com/jquery/jquery-migrate/blob/main/CONTRIBUTING.md

Clone your forked jQuery Migrate repository to your local machine to begin development.

```bash
git clone git@github.com:username/jquery-migrate.git
```

--------------------------------

### Checking Document ReadyState for Load Events

Source: https://github.com/jquery/jquery-migrate/blob/main/warnings.md

If a function depends on all page assets being loaded, check document.readyState. If it's 'complete', run the function immediately. Otherwise, use $(window).on('load', fn).

```javascript
if ( document.readyState === "complete" ) {
  fn();
} else {
  $( window ).on( "load", fn );
}
```

--------------------------------

### Enable Watch Task for Auto-Rebuild

Source: https://github.com/jquery/jquery-migrate/blob/main/CONTRIBUTING.md

Use the watch task to automatically rebuild distribution files whenever a change is saved, avoiding manual rebuilds.

```bash
npm start
```

--------------------------------

### AJAX Request with JSONP Callback Handling

Source: https://github.com/jquery/jquery-migrate/blob/main/test/data/ajax-jsonp-callback-name.html

Initiates an AJAX request with dataType 'json' and a JSONP callback. It chains subsequent requests and checks for proper callback name management.

```javascript
jQuery.ajax( {
    url: "fakeScript1.js?callback=?",
    dataType: "json",
    beforeSend: function( jqXHR, s ) {
        s.callback = s.jsonpCallback;
        thisCallbackInWindow1 = this.callback in window;
    }
} ).then( function() {
    var previous = this;
    previousJsonpCallback = previous.jsonpCallback;
    thisCallbackInWindow2 = this.callback in window;
    return jQuery.ajax( {
        url: "fakeScript2.js?callback=?",
        dataType: "json",
        beforeSend: function() {
            previousCallback = previous.callback;
            nextJsonpCallback = this.jsonpCallback;
            // Test cleanup
            delete window.customJsonpCallback;
        }
    } );
} ).catch( function( _jqXHR, _textStatus, err ) {
    if ( !( err instanceof Error ) && _jqXHR instanceof Error ) {
        err = _jqXHR;
    }
    // Test cleanup in case of an error
    delete window.customJsonpCallback;
    requestSucceeded = false;
    error = err;
} ).then( function() {
    startIframeTest( thisCallbackInWindow1, thisCallbackInWindow2, previousJsonpCallback, previousCallback, nextJsonpCallback, requestSucceeded, error );
} );
```

--------------------------------

### Change Test Server Port

Source: https://github.com/jquery/jquery-migrate/blob/main/CONTRIBUTING.md

Run the test server on a different port by setting the PORT environment variable.

```bash
PORT=3001 npm run test:server
```

--------------------------------

### jQuery.migrateVersion

Source: https://github.com/jquery/jquery-migrate/blob/main/README.md

This string property indicates the version of Migrate in use.

```APIDOC
## jQuery.migrateVersion

### Description
This string property indicates the version of Migrate in use.

### Property
`jQuery.migrateVersion` (string)
```

--------------------------------

### Add Upstream Remote

Source: https://github.com/jquery/jquery-migrate/blob/main/CONTRIBUTING.md

Add the main jQuery Migrate repository as an 'upstream' remote to easily pull updates.

```bash
git remote add upstream git@github.com:jquery/jquery-migrate.git
```

--------------------------------

### jQuery.migrateTrace

Source: https://github.com/jquery/jquery-migrate/blob/main/README.md

Set this property to false to disable stack traces from appearing on the console with warnings.

```APIDOC
## jQuery.migrateTrace

### Description
Set this property to `false` if you want warnings but do not want stack traces to appear on the console.

### Property
`jQuery.migrateTrace` (boolean)
```

--------------------------------

### jQuery.migrateIsPatchEnabled

Source: https://github.com/jquery/jquery-migrate/blob/main/README.md

Returns true if a patch of a provided code is enabled and false otherwise.

```APIDOC
## jQuery.migrateIsPatchEnabled

### Description
Returns `true` if a patch of a provided code is enabled and `false` otherwise.

### Method
`jQuery.migrateIsPatchEnabled(code: string): boolean`

### Parameters
#### Path Parameters
- **code** (string) - Required - The code of the patch to check.
```

--------------------------------

### Load Project and Bind Late Load Event

Source: https://github.com/jquery/jquery-migrate/blob/main/test/data/event-lateload.html

Loads the jQuery and jQuery-migrate projects and binds a 'load' event handler. This handler is expected to trigger a warning if jQuery Migrate is loaded late.

```javascript
TestManager.loadProject( "jquery", "git" );
jQuery.noConflict();
TestManager.loadProject( "jquery-migrate", "dev", true );
var resolve, loaded = new Promise( function ( _resolve ) {
  resolve = _resolve;
} );

// No warning here, document isn't yet loaded
jQuery( window ).on( "load", function() {
  resolve();
});

Promise.all( [ jQuery.ready, loaded ] ).then( function() {
  // This .on() call should warn
  jQuery( window ).on( "load", jQuery.noop );
  startIframeTest();
} );
```

--------------------------------

### HTML5 Doctype for Standards Mode

Source: https://github.com/jquery/jquery-migrate/blob/main/warnings.md

Ensures the document renders in standards mode, which is required for jQuery compatibility. The simplest valid doctype is the HTML5 one.

```html
<!doctype html>
```

--------------------------------

### jQuery.migrateMute

Source: https://github.com/jquery/jquery-migrate/blob/main/README.md

Set this property to true to prevent console warnings from being generated. The message array is still maintained.

```APIDOC
## jQuery.migrateMute

### Description
Set this property to `true` to prevent console warnings from being generated in the development version. The `jQuery.migrateMessages` array is still maintained when this property is set, which allows programmatic inspection without console output.

### Property
`jQuery.migrateMute` (boolean)
```

--------------------------------

### jQuery.migrateMessages

Source: https://github.com/jquery/jquery-migrate/blob/main/README.md

An array of string warning messages generated by the code on the page, in the order they were generated. Messages appear only once unless reset.

```APIDOC
## jQuery.migrateMessages

### Description
This property is an array of string warning messages that have been generated by the code on the page, in the order they were generated. Messages appear in the array only once, even if the condition has occurred multiple times, unless `jQuery.migrateReset()` is called.

### Property
`jQuery.migrateMessages` (Array<string>)
```

--------------------------------

### jQuery.migrateDeduplicateMessages

Source: https://github.com/jquery/jquery-migrate/blob/main/README.md

By default, Migrate only gives a specific warning once. Set this property to false to give a warning for every occurrence.

```APIDOC
## jQuery.migrateDeduplicateMessages

### Description
By default, Migrate only gives a specific warning once. If you set this property to `false` it will give a warning for every occurrence each time it happens. Note that this can generate a lot of output, for example when a warning occurs in a loop.

### Property
`jQuery.migrateDeduplicateMessages` (boolean)
```

--------------------------------

### jQuery.migrateDisablePatches

Source: https://github.com/jquery/jquery-migrate/blob/main/README.md

Disables patches by their codes. A code for each patch can be found in square brackets in warnings.md.

```APIDOC
## jQuery.migrateDisablePatches

### Description
Disables patches by their codes. You can find a code for each patch in square brackets in [warnings.md](https://github.com/jquery/jquery-migrate/blob/main/warnings.md). A limited number of warnings doesn't have codes defined and cannot be disabled. These are mostly setup issues like using an incorrect version of jQuery or loading Migrate multiple times.

### Method
`jQuery.migrateDisablePatches(codes: string | string[])`

### Parameters
#### Path Parameters
- **codes** (string | string[]) - Required - A string or an array of strings representing the patch codes to disable.
```

--------------------------------

### Include jQuery Migrate Plugin

Source: https://github.com/jquery/jquery-migrate/blob/main/README.md

Load the jQuery Migrate plugin after the jQuery script tag in your HTML. This ensures jQuery is available before the migrate plugin attempts to modify its behavior.

```html
<script src="https://code.jquery.com/jquery-4.0.0.js"></script>
<script src="https://code.jquery.com/jquery-migrate-4.0.2.js"></script>
```

--------------------------------

### jQuery.migrateReset()

Source: https://github.com/jquery/jquery-migrate/blob/main/README.md

Clears the jQuery.migrateMessages array and forgets the list of messages that have been seen already.

```APIDOC
## jQuery.migrateReset()

### Description
This method clears the `jQuery.migrateMessages` array and "forgets" the list of messages that have been seen already.

### Method
`jQuery.migrateReset()`
```

--------------------------------

### jQuery.UNSAFE_restoreLegacyHtmlPrefilter

Source: https://github.com/jquery/jquery-migrate/blob/main/README.md

A deprecated alias of jQuery.migrateEnablePatches( "self-closed-tags" ).

```APIDOC
## jQuery.UNSAFE_restoreLegacyHtmlPrefilter

### Description
A deprecated alias of `jQuery.migrateEnablePatches( "self-closed-tags" )`.

### Method
`jQuery.UNSAFE_restoreLegacyHtmlPrefilter()`
```

--------------------------------

### Custom AJAX Transport for Script Type

Source: https://github.com/jquery/jquery-migrate/blob/main/test/data/ajax-jsonp-callback-name.html

Defines a custom AJAX transport for 'script' type requests. This transport intercepts requests to 'fakeScript' URLs and simulates a JSONP response.

```javascript
jQuery.ajaxTransport( "script", function( options ) {
    if ( options.url.indexOf( 'fakeScript' ) === -1 ) {
        return;
    }
    return {
        abort: function () {},
        send: function ( headers, completeCallback ) {
            var script = options.jsonpCallback + "( { answer: 42 } )";
            setTimeout( function() {
                completeCallback( 200, 'OK', { text: script }, \[\] );
            } );
        }
    };
} );
```

--------------------------------

### Pull Upstream Changes

Source: https://github.com/jquery/jquery-migrate/blob/main/CONTRIBUTING.md

Regularly pull changes from the 'upstream' main branch to keep your local repository synchronized.

```bash
git pull upstream main
```

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