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> <span data-i18n="watch.label.files"></span></label>
         <div id="node-input-files" contenteditable="true" tabindex="1" data-i18n="[placeholder]watch.placeholder.files"></div>
    </div>
    <div class="form-row">
        <label for="node-input-name"><i class="fa fa-tag"></i> <span data-i18n="common.label.name"></span></label>
        <input type="text" id="node-input-name" data-i18n="[placeholder]common.label.name">
    </div>
     <div id="node-input-tip" class="form-tips"><span data-i18n="watch.tip"></span></div>
</script>

<script type="text/x-red" data-help-name="watch">
    <p>Watches a directory or file for changes.</p>
    <p>You can enter a list of comma separated directories and/or files. You will
    need to put quotes "..." around any that have spaces in.</p>
    <p>On Windows you must use double back-slashes \\ in any directory names.</p>
    <p>The full filename of the file that actually changed is put into <code>msg.payload</code>,
    while a stringified version of the watch list is returned in <code>msg.topic</code>.</p>
    <p><code>msg.file</code> contains just the short filename of the file that changed.
    <code>msg.type</code> has the type of thing changed, usually <i>file</i> or <i>directory</i>,
    while <code>msg.size</code> holds the file size in bytes.</p>
    <p>Of course in Linux, <i>everything</i> is a file and thus can be watched...</p>
    <p><b>Note: </b>The directory or file must exist in order to be watched. If the file
    or directory gets deleted it may 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, format:"filepath"}
        },
        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>