EF_CleanPropertyKeyframes.jsx

/**========================================================================
 * ?                  EF_CleanPropertyKeyframes.jsx
 * @author         :  Eveline Falcão (https://evelinefalcao.com)
 * @email          :  hello@evelinefalcao.com
 * @version        :  1.0.0
 * @createdFor     :  Adobe After Effects CC 2024 (Version 24.1.0 Build 78)
 * @description    :  Removes all keyframes from selected properties. Supports multiple layer and property selections.
 *========================================================================**/

(function cleanPropertyKeyframes(){
    app.beginUndoGroup("Clean property keyframes.")

    var comp = app.project.activeItem;
    if (comp instanceof CompItem && comp != null) {
        var allProperties = comp.selectedProperties;
            if (allProperties.length > 0){
                for (var property = 0; property < allProperties.length; property++) {
                    var selectedProperty = allProperties[property];
                    while(selectedProperty.numKeys > 0) {
                        selectedProperty.removeKey(1);
                    }
                }
            } else {
                alert("Select a property within a layer.")
            }
    } else {
        alert("Select your active Comp in the project panel or timeline.")
    }

    app.endUndoGroup();

})();