Filters

PHP

• compile_options modify the partially compiled options array, called multiple times, (3 arguments), $compiled_options, $default_options, $new_options
• wa_fronted_options modify options array, use this to set your options (1 argument)
• wa_fronted_settings_fields modify default settings fields to render into form (1 argument), array of field keys
• wa_fronted_settings_values modify values before they're sent to the wp_update_post function array, use this to set your options (1 argument)
• supported_acf_fields modify supported ACF fields array (1 argument)
• supported_woo_fields modify supported WooCommerce fields/values array (1 argument)
• supported_custom_fields modify supported native custom field types (1 argument)
• wa_fronted_revisions modify the returned array of revisions (2 arguments), $revisions, $post_id
• wa_fronted_autosave_data modify the data before it creates an autosave revision (2 arguments), $autosave_data, $data
• wa_fronted_get_autosave modify the data before it returns autosaved revision (1 argument), $autosave_data
• wa_get_js_i18n modify the array of translateable strings sent to javascript (1 argument), $translations

Javascript

The javascript filters functions very similarly to their native PHP counterparts. Only difference is that these functions resides within the wa_fronted object, so to call the add_filter function, you type like so: wa_fronted.add_filter('filter_name', function(value){ return value; });

• toolbar_buttons modify the buttons available to the editor toolbar (2 arguments), passes an array of strings as the first argument (which should be returned) and current editor options as second
• editor_plugins modify plugins loaded in TinyMCE (2 arguments), passes an object with active extensions as the first argument (which should be returned), and current editor options as second.
• validate add a custom validation method. Should only return true or false (4 arguments), bool (result), value to validate, validation method called, comparison value
• validation_msg add a custom validation error message (3 arguments), message, validation method, comparison value
• revision_content modify the contents of the revision field (3 arguments), new_content (revision contents), editor (editor object + options), revision (revision object), new_content (revision contents)
• revision_db_value modify the database value of revision field (if necessary) (3 arguments), new_content (revision contents), editor (editor object + options), revision (revision object)
• image_upload_toolbar modify the array of button elements that is shown together with the image upload button (2 arguments), buttons, editor_options
• image_edit_toolbar modify the array of button elements that is shown in the image edit toolbar (2 arguments), buttons, editor_options
• shortcode_actions add your shortcode base to be called within shortcode_action_{shortcode base} instead of the regular shortcode edit input
• save_extra_data if you need to pass additional data through ajax upon save, use this filter, (3 arguments), data_to_save, content (regular content to be saved), editor_options
• autosave_extra_data if you need to pass additional data through ajax upon autosave, use this filter, (3 arguments), data_to_save, content (regular content to be saved), editor_options

I'll try to add filters where I see it could be useful, but if you are missing one, please post an issue requesting it