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Most syntax is transformable by Babel. In rarer cases (if the transform isn't implemented yet, or there isn't a default way to do so), you can use plugins such as @babel/plugin-syntax-bigint to only allow Babel to parse specific types of syntax. Or you want to preserve the source code because you only want Babel to do code analysis or codemods.
This article assumes that you've read Writing a Plugin, giving an overview (and many details) of how to develop a plugin. The same speaks specifically about the API "Hooks", also known as "Filters" and "Actions", used by WordPress to set your plugin at runtime.
Hooks are provided by WordPress to allow your plugin to 'hook into' the rest of WordPress; that is, to call functions in your plugin at specific times, and thereby set your plugin in motion. There are two kinds of hooks:
You can sometimes accomplish the same goal with either an action or a filter. For example, if you want your plugin to change the text of a post, you might add an action function to publish_post (so the post is modified as it is saved to the database), or a filter function to the_content (so the post is modified as it is displayed in the browser screen).
Actions are triggered by specific events that take place in WordPress, such as publishing a post, changing themes, or displaying an administration screen. An Action is a custom PHP function defined in your plugin (or theme) and hooked, i.e. set to respond, to some of these events. Actions usually do one or more of the following:
The first step in creating an action in your plugin is to create a PHP function with the action functionality of your plugin and put it in your plugin file (your plugin file must go into the wp-content/plugins directory). For example, if you want your friends to get an email message whenever you create a new post, you might define the following function:
For most actions, your function should accept a single parameter (usually the post or comment ID, depending on the action). Some actions take more than one parameter -- check the documentation for the action (if available) or the WordPress source code for more information. Besides the one parameter, you can also access the global variables of WordPress, and call other WordPress functions (or functions in your plugin file).
NOTE: Keep in mind that other plugins or the WordPress core may already be using the function name you have thought of. See the next section, Avoiding Function Name Collisions for more information.
This is a problem because PHP does not allow multiple functions with the same name. If two plugins provide a function with the same name, or a plugin provides a function with a name the same as a WordPress function, the blog could cease to function. There are two ways to avoid this problem.
The first solution is to prefix every function in your plugin with a unique set of characters. If your name is John Q. Public, you might declare your functions as function jqp_output() .... The likelihood that someone with the same initials does the same thing with their plugin is possible but low.
The add_action() function outside of the class adds the action to WordPress that tells it to call the send method when a post is published. The array used in the second parameter tells the plugin system to call the static method of the class 'emailer' named 'send'.
The last step in getting your action hook to work is to install the file and activate the plugin. The PHP function you wrote and the add_action call must go into a PHP file together, and the PHP file must be installed in the wp-content/plugins directory. Once it is installed, you will need to visit the admin section of WordPress and activate your plugin; see Managing Plugins for more details.
Filters are functions that WordPress passes data through, at certain points in execution, just before taking some action with the data (such as adding it to the database or sending it to the browser screen). Filters sit between the database and the browser (when WordPress is generating pages), and between the browser and the database (when WordPress is adding new posts and comments to the database); most input and output in WordPress passes through at least one filter. WordPress does some filtering by default, and your plugin can add its own filtering.
A filter function takes as input the unmodified data and returns modified data (or in some cases, a null value to indicate the data should be deleted or disregarded). If the data is not modified by your filter, then the original data must be returned so that subsequent plugins can continue to modify the value if necessary.
So, the first step in creating a filter in your plugin is to create a PHP function to do the filtering, and put it in your plugin file (your plugin file must go into the wp-content/plugins directory). For example, if you want to make sure that your posts and comments contain no profanity, you might define a variable with a list of forbidden words, and then create the following PHP function:
The last step in getting your filter hook to work is to install the file and activate the plugin. The PHP function you wrote and the add_filter() call must go into a PHP file together, and the PHP file must be installed in the wp-content/plugins directory. Once it is installed, you will need to visit the admin section of WordPress and activate your plugin; see Managing Plugins for more details.
In some cases, you may find that you want your plugin to disable one of the actions or filters built into WordPress, or added by another plugin. You can do that by calling remove_filter('filter_hook','filter_function') or remove_action('action_hook','action_function').
Note that if a hook was registered using a priority other than the default of 10, then you must also specify the priority in the call to remove_action(). Also note that in general, you shouldn't remove anything unless you know what it does and why it does it -- check the WordPress or other plugin source code to be sure.
Besides the hooks (actions and filters) described above, another way for a plugin to modify WordPress's behavior is to override WordPress functions. In fact, there is a small set of functions WordPress intends for plugins to redefine. These are called Pluggable Functions and they are defined in wp-includes/pluggable.php. WordPress loads these functions only if they are still undefined after all plugins have been loaded. For more details examine wp-settings.php file.
If your plugin has tasks to complete only at activation or deactivation time, it can use register_activation_hook and register_deactivation_hook. Many plugins do not need to use these, as the plugins only modify current behavior. However, if your plugin (for example) needs to change a default option on activation, it can use these functions.
The register_uninstall_hook gives your plugin the option of cleaning up after itself when it is deleted from the WordPress installation. Users have reasons to temporarily deactivate plugins, so do not do anything from the deactivation hook that would lose any user settings. This is what the uninstall hook is for.
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An ESLint plugin is an extension for ESLint that adds additional rules and configuration options. Plugins let you customize your ESLint configuration to enforce rules that are not included in the core ESLint package. Plugins can also provide additional environments, custom processors, and configurations.
Each plugin is an npm module with a name in the format of eslint-plugin-, such as eslint-plugin-jquery. You can also use scoped packages in the format of @/eslint-plugin- such as @jquery/eslint-plugin-jquery or even @/eslint-plugin such as @jquery/eslint-plugin.
Plugins can expose custom rules for use in ESLint. To do so, the plugin must export a rules object containing a key-value mapping of rule ID to rule. The rule ID does not have to follow any naming convention (so it can just be dollar-sign, for instance). To learn more about creating custom rules in plugins, refer to Custom Rules.
Plugins can expose additional environments for use in ESLint. To do so, the plugin must export an environments object. The keys of the environments object are the names of the different environments provided and the values are the environment settings. For example:
You can bundle configurations inside a plugin by specifying them under the configs key. This can be useful when you want to bundle a set of custom rules with additional configuration. Multiple configurations are supported per plugin.
If the example plugin above were called eslint-plugin-myPlugin, the myConfig and myOtherConfig configurations would then be usable in a configuration file by extending "plugin:myPlugin/myConfig" and "plugin:myPlugin/myOtherConfig", respectively.
The meta.name property should match the npm package name for your plugin and the meta.version property should match the npm package version for your plugin. The easiest way to accomplish this is by reading this information from your package.json.
Data source plugins communicate with external sources of data and return the data in a format that Grafana understands. By adding a data source plugin, you can immediately use the data in any of your existing dashboards.
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