node-red/nodes/core/io/23-watch.html

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<script type="text/x-red" data-template-name="watch">
    <div class="form-row node-input-filename">
         <label for="node-input-files"><i class="fa fa-file"></i> File(s)</label>
         <input type="text" id="node-input-files" placeholder="File(s) or Directory">
    </div>
    <div class="form-row">
        <label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
        <input type="text" id="node-input-name" placeholder="Name">
    </div>
     <div id="node-input-tip" class="form-tips">On Windows you must use double slashes \\ in any directory names.</div>
</script>

<script type="text/x-red" data-help-name="watch">
    <p>Watches a directory or file for any changes.</p>
    <p>You can enter a list of comma separated directories or files if you like. You will need to put " around any that have spaces in.</p>
    <p>On Windows you must use double slashes \\ in any directory names.</p>
    <p>The full filename of the file that actually changed is put into <b>msg.payload</b>, while a stringified version of the watched criteria is returned in <b>msg.topic</b>.</p>
    <p>msg.file contains just the short filename of the file that changed.</p>
    <p>Of course in Linux, <i>everything</i> could be a file and thus watched...</p>
    <p><b>Note: </b>The directory or file must exist in order to be watched. If the file or directory get deleted it will no longer be monitored even if it gets re-created.</p>
</script>

<script type="text/javascript">
    RED.nodes.registerType('watch',{
        category: 'advanced-input',
        defaults: {
            name: {value:""},
            files: {value:"",required:true}
        },
        color:"BurlyWood",
        inputs:0,
        outputs:1,
        icon: "watch.png",
        label: function() {
            return this.name||this.files;
        },
        labelStyle: function() {
            return this.name?"node_label_italic":"";
        }
    });
</script>