Add polyfill junction node

utility/junction/LICENSE

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+Copyright 2016-2022 JS Foundation and other contributors, https://js.foundation/
+Copyright 2013-2016 IBM Corp.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.

utility/junction/README.md

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+node-red-node-junction
+======================
+
+A Node-RED node to allow flows containing junctions to be imported into older versions
+of Node-RED.
+
+The ability to create junctions was introduced in Node-RED 3.0.0, adding a new core
+node type called `junction`.
+
+This module provides its own `junction` node type that can be installed into older
+versions of Node-RED to allow them to run flows containing that type.
+
+The module will only register the type if it detects it is being loaded into
+Node-RED version 2 or older, otherwise it does nothing.
+
+
+Install
+-------
+
+Run the following command in your Node-RED user directory - typically `~/.node-red`
+
+    npm i node-red-node-junction

utility/junction/junction.html

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+<script type="text/html" data-template-name="junction">
+    <div class="form-row">
+        <div class="form-tips">
+            <p>The current flow was created in a newer version of Node-RED and contains
+                <code>junctions</code>.</p>
+            <p>This version of Node-RED does not support <code>junctions</code> and
+                they have been replaced by this placeholder node by the
+                <code>node-red-node-junction</code> module.</p>
+            <p>To use <code>junctions</code>, upgrade to Node-RED 3.0.0 or later.</p>
+        </div>
+    </div>
+</script>
+
+<script type="text/html" data-help-name="junction">
+    <p>A placeholder node for the junction feature added in Node-RED 3.0.0.</p>
+    <p>This version of Node-RED does not support <code>junctions</code> and
+        they have been replaced by this placeholder node by the
+        <code>node-red-node-junction</code> module.</p>
+    <p>To use <code>junctions</code>, upgrade to Node-RED 3.0.0 or later.</p>
+</script>
+
+<script type="text/javascript">
+    RED.nodes.registerType('junction',{
+        category: 'common',
+        inputs: 1,
+        outputs: 1,
+        icon: 'font-awesome/fa-circle-o',
+        defaults: {
+            l: {value: false}
+        },
+        label: function() {
+            return "junction";
+        },
+        labelStyle: "node_label_italic"
+    });
+</script>

utility/junction/junction.js

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+
+module.exports = function(RED) {
+    var version = RED.version();
+    var parts = /^(\d)+\.(\d)+\.(\d)+/.exec(version);
+    if (parts) {
+        var major = parseInt(parts[1]);
+        if (major > 2) {
+            throw new Error("This module is not required for Node-RED 3 or later")
+        }
+    }
+    function JunctionNode(n) {
+        RED.nodes.createNode(this,n);
+        this.on("input",function(msg, send, done) {
+            send(msg);
+            done();
+        });
+    }
+    console.log("HERE!!!!!!",major)
+    RED.nodes.registerType("junction",JunctionNode);
+}

utility/junction/package.json

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+{
+    "name": "node-red-node-junction",
+    "version": "1.0.0",
+    "description": "A Node-RED node to allow flows containing junctions to be imported into Node-RED 2 or earlier.",
+    "dependencies": {},
+    "repository": {
+        "type": "git",
+        "url": "https://github.com/node-red/node-red-nodes.git",
+        "directory": "tree/master/utility/junction"
+    },
+    "license": "Apache-2.0",
+    "keywords": [
+        "node-red"
+    ],
+    "node-red": {
+        "version": "<3.0.0",
+        "nodes": {
+            "junction": "junction.js"
+        }
+    },
+    "author": "Dave Conway-Jones <dceejay@gmail.com>"
+}