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deadred.js
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//
// Very simple support for flow execution. Only those nodes that I have
// thought of are supported and even then not really.
//
// This implementation is very basic and certainly does not cover every
// edge case nor does it make a guarantee of correctness.
//
// This makes the assumption that RED is defined.
//
// License: Do anything with this code except evilness.
// Copyright: Gerrit Riessen, [email protected]
//
var DEADRED = (function() {
let stopExecution = false;
let executionState = {};
function clearStatusForNode(ndeid) {
emitStatusForNode(ndeid,{})
}
function emitStatusForNode(ndeid,status) {
RED.comms.emit([{ "topic":"status/" + ndeid, "data": status }])
}
function nodeTypeNotSupported(nde,details) {
RED.notify(
"Execution of type: " + nde.type + " ("+nde.id+") not supported" + ( details ? `: ${details}` : ""),
"warning"
);
}
function isNodeDebugCounter(nde) {
return (
nde.type == "debug" && nde.tostatus && (
nde.statusType == "counter" || nde.statusType == "auto")
)
}
function executeSubflow(msg, subflowId) {
var subflow = RED.nodes.subflow(subflowId)
if ( subflow.in.length > 0 ) {
var startNode = RED.nodes.node(
RED.nodes.getNodeLinks(subflow.in[0].id)[0].target.id
)
captureExceptionExecuteNode(startNode, msg)
}
}
// code taken from
// https://developer.mozilla.org/en-US/docs/Glossary/Base64#the_unicode_problem
function base64ToBytes(base64) {
const binString = atob(base64);
return Uint8Array.from(binString, (m) => m.codePointAt(0));
}
function bytesToBase64(bytes) {
const binString = String.fromCodePoint(...bytes);
return btoa(binString);
}
function cloneIt(obj) {
if ( typeof structuredClone != "undefined" ) { //looking at your Opera...
try {
return structuredClone(obj)
} catch ( ex ) {
return JSON.parse(JSON.stringify(obj))
}
} else {
return JSON.parse(JSON.stringify(obj))
}
}
function logExceptionToDebug(ex,nde,msg) {
let debugMsg = {
id: nde.id,
z: nde.z,
_alias: nde.id,
path: nde.z,
name: RED.utils.getNodeLabel(nde),
topic: msg.topic,
msg: JSON.stringify( { msg: msg, exception: ex } ),
format: "Object"
}
setTimeout( () => {
RED.comms.emit([{
topic: "debug",
data: debugMsg
}])
}, 500);
}
function msgTracerOnReceiveHook(evnt) {
try {
let nde = RED.nodes.node(evnt.destination.id)
if ( !nde ) { return undefined }
emitStatusForNode(nde.id, {
"text": "msg " + (nde.type == "inject" ?
"generated" : "received"),
"fill": "grey",
"shape":"ring"
})
var ndeid = nde.id
setTimeout( () => { clearStatusForNode(ndeid) }, 1500);
RED.comms.emit([{
topic: "msgtracer:node-received",
data: {
nodeid: evnt.destination.id
}
}])
return nde
} catch (ex) {
console.error(ex)
}
}
function msgTracerOnReceiveHookWithDebug(evnt) {
try {
let nde = msgTracerOnReceiveHook(evnt)
// don't publish debug messages for junctions because they
// cause errors in handleDebugMessages in the client.
if ( !nde || nde.type == "junction") { return }
let msg = {
id: nde.id,
z: nde.z,
_alias: nde.id,
path: nde.z,
name: RED.utils.getNodeLabel(nde),
topic: evnt.msg.topic,
msg: evnt.msg
}
RED.comms.emit([{
topic: "debug",
data: msg
}])
} catch (ex) {
console.error(ex)
}
}
//
// Main node handler. ExecuteNode modifies the message as required by the
// node type, throwing up an error if the node isn't supported or passing
// on the modified messages to the nodes links. This is called by the
// main flow execution and by a subflow execution (see 'subflow' type below).
//
function executeNode(nde, msg) {
// d ==> disabled
if ( stopExecution || nde.d ) { return; }
// clone the message, handle exceptions with shallower clone
msg = cloneIt(msg)
// emit an onReceive hook
RED.hooks.trigger( "onReceive", { msg: msg, destination: nde } )
// message tracing can be deactivated using the __notrace property
// on the msg object.
/* -- now using explicit message tracing.
if ( !msg.__notrace ) {
// don't overwrite the counter
if ( !isNodeDebugCounter(nde) ) {
emitStatusForNode(nde.id, {
"text": "msg " + (nde.type == "inject" ?
"generated" : "received"),
"fill": "grey",
"shape":"ring"
})
var ndeid = nde.id
setTimeout( () => { clearStatusForNode(ndeid) }, 1500);
}
}
*/
// Start of subflow execution. This is done using a similar method
// to the handling of link nodes: add an array to the message to
// indicate that this is part of a subflow.
var mth = nde.type.match(/^subflow:(.+)$/i)
if ( mth ) {
var ndeid = nde.id
var evtId = "subevt:" + nde.id + ":" + mth[1]
msg._subflowOut = msg._subflowOut || []
msg._subflowOut.push(evtId)
msg._subflowStatus = msg._subflowStatus || []
msg._subflowStatus.push(evtId)
executeSubflow(msg, mth[1])
return
}
// Within the swith, a 'break' will cause an error message explaining
// that the node is not supported. A 'return' will mean the node
// has been completely applied.
switch ( nde.type ) {
case 'base64':
if ( nde.action == "b64" ) {
var atobUtf8 = (content) => {
return new TextDecoder().decode(base64ToBytes(content));
};
RED.utils.setMessageProperty(
msg,
nde.property,
atobUtf8(RED.utils.getMessageProperty(
msg, nde.property
))
)
passMsgToLinks(RED.nodes.getNodeLinks( nde ), msg);
return
}
if ( nde.action == "str" ) {
var btoaUtf8 = (content) => {
return bytesToBase64(new TextEncoder().encode(content))
}
RED.utils.setMessageProperty(
msg,
nde.property,
btoaUtf8(RED.utils.getMessageProperty(
msg, nde.property
))
)
passMsgToLinks(RED.nodes.getNodeLinks( nde ), msg);
return
}
if ( nde.action == "" ) {
var val = RED.utils.getMessageProperty(
msg, nde.property
)
if ( typeof val == "string" ) {
RED.utils.setMessageProperty(
msg,
nde.property,
base64ToBytes(val)
)
passMsgToLinks(RED.nodes.getNodeLinks( nde ), msg);
return
} else if ( typeof val == "object") {
RED.utils.setMessageProperty(
msg,
nde.property,
bytesToBase64(val)
)
passMsgToLinks(RED.nodes.getNodeLinks( nde ), msg);
return
} else if ( !val ) {
// silently ignore doing anything
passMsgToLinks(RED.nodes.getNodeLinks( nde ), msg);
return
}
}
break
case "ClientCode":
let ccCode = msg.clientcode || nde.clientcode
RED.comms.emit([{
"topic":"introspect:client-code-perform",
"data":{
"msg": "execfunc",
"payload": msg.payload,
"topic": msg.topic,
"func": ccCode,
"nodeid": nde.id,
"_msg": { ...msg },
"format": `string[${ccCode.length}]`
}
}])
return;
case "change":
nde.rules.forEach( rle => {
if ( rle.t == "set" ) {
if ( rle.pt == "msg" && rle.tot == "str" ) {
msg[rle.p] = rle.to
}
if ( rle.pt == "msg" && rle.tot == "bool" ) {
msg[rle.p] = (rle.to === "true")
}
if ( rle.pt == "msg" && rle.tot == "num" ) {
msg[rle.p] = Number(rle.to)
}
if ( rle.pt == "msg" && rle.tot == "json" ) {
msg[rle.p] = JSON.parse(rle.to)
}
if ( rle.pt == "msg" && rle.tot == "jsonata" ) {
msg[rle.p] = jsonata(rle.to.replace(/\$\$[.]/g,"$").replace(/msg[.]/g,"$")).evaluate(msg,msg)
}
if ( rle.pt == "msg" && rle.tot == "msg" ) {
RED.utils.setMessageProperty(
msg,
rle.p,
RED.utils.getMessageProperty(msg, rle.to)
)
}
}
if ( rle.t == "delete" && rle.pt == "msg" ) {
delete msg[rle.p];
}
})
passMsgToLinks(RED.nodes.getNodeLinks( nde ), msg);
return
case "csv":
if ( typeof msg.payload == "object" ) {
var cfg = {
header: nde.hdrout != "none",
newline: nde.ret,
}
if ( !Array.isArray(msg.payload) ) {
msg.payload = [msg.payload]
}
msg.payload = Papa.unparse( msg.payload, cfg )
passMsgToLinks(RED.nodes.getNodeLinks( nde ), msg)
return
} else {
var cfg = {
delimiter: nde.spe,
skipFirstNLines: parseInt(nde.skip),
header: nde.hdrin,
skipEmptyLines: !nde.include_empty_strings,
}
if ( nde.multi == "one" ) {
Papa.parse( msg.payload, cfg ).data.forEach( d => {
msg = cloneIt(msg)
msg.payload = d
msg._msgid = RED.nodes.id()
passMsgToLinks(RED.nodes.getNodeLinks( nde ), msg);
})
} else {
msg.payload = Papa.parse( msg.payload, cfg ).data
passMsgToLinks(RED.nodes.getNodeLinks( nde ), msg);
}
return
}
break
case "debug":
if ( !nde.active ) { return }
let donesomething = false;
if ( nde.console ) {
console.log( "Debug [console log]", msg)
donesomething = true
}
if ( nde.tosidebar ) {
var debugData = {
"id": nde.id,
"z": nde.z,
"path": nde.z,
"name": nde._def.label.call(nde),
"topic": msg.topic,
"property": "",
"msg": JSON.stringify(msg),
"format": "Object"
}
if ( nde.complete != "true" ) {
if (nde.complete == "false"){ nde.complete = "payload" }
debugData["property"] = nde.complete
var val = RED.utils.getMessageProperty(
msg, nde.complete
)
if ( val == undefined ) {
debugData["msg"] = val
debugData["format"] = "string[0]"
} else if ( typeof val === "string" ) {
debugData["msg"] = val
debugData["format"] = "string[" + val.length + "]"
} else if ( Array.isArray(val) ) {
debugData["msg"] = JSON.stringify(val)
debugData["format"] = "array[" + val.length + "]"
} else if ( val.__proto__ == Uint8Array.prototype ) {
debugData["format"] = "array[" + val.length + "]"
val = Array.of( ...val )
debugData["msg"] = JSON.stringify(val)
} else {
debugData["msg"] = JSON.stringify(val)
debugData["format"] = "Object"
}
}
// if a debug appears in a subflow, it needs to have
// more details to identify it.
if ( msg._subflowOut && msg._subflowOut.length > 0 ) {
var evnt = msg._subflowOut[msg._subflowOut.length-1]
var origNdeId = evnt.split(":")[1]
var wrkSpId = RED.nodes.node(origNdeId).z
debugData["_alias"] = nde.id
debugData["id"] = origNdeId + "-" + nde.id
debugData["z"] = origNdeId
debugData["path"] = wrkSpId + "/" + origNdeId
}
RED.comms.emit([{ "topic": "debug", "data": debugData }])
donesomething = true
}
if( isNodeDebugCounter(nde) ) {
executionState[nde.id] = executionState[nde.id] || {
cnt: 0
}
executionState[nde.id]["cnt"] += 1
let txt = executionState[nde.id]["cnt"];
if ( nde.statusType == "auto" ) {
txt = JSON.stringify( msg )
}
emitStatusForNode(nde.id, {
"text": txt,
"fill":"blue",
"shape":"ring"
})
donesomething = true
}
if ( donesomething ) return
break
case "delay":
if ( nde.pauseType === "delayv" ) {
var vDur = Number( msg.delay )
vDur = vDur > 0 ? vDur : 0
setTimeout( () => {
passMsgToLinks(RED.nodes.getNodeLinks( nde ), msg)
}, vDur);
return
}
if ( nde.pauseType === "delay" ) {
let duration = nde.timeout * 1000;
if (nde.timeoutUnits === "milliseconds") {
duration = nde.timeout;
} else if (nde.timeoutUnits === "minutes") {
duration = nde.timeout * (60 * 1000);
} else if (nde.timeoutUnits === "hours") {
duration = nde.timeout * (60 * 60 * 1000);
} else if (nde.timeoutUnits === "days") {
duration = nde.timeout * (24 * 60 * 60 * 1000);
}
setTimeout( () => {
passMsgToLinks(RED.nodes.getNodeLinks( nde ), msg)
}, duration);
return
}
if ( nde.pauseType === "random" ) {
let rFirst = nde.randomFirst * 1000;
let rLast = nde.randomLast * 1000;
if (nde.randomUnits === "milliseconds") {
rFirst = nde.randomFirst * 1;
rLast = nde.randomLast * 1;
} else if (nde.randomUnits === "minutes") {
rFirst = nde.randomFirst * (60 * 1000);
rLast = nde.randomLast * (60 * 1000);
} else if (nde.randomUnits === "hours") {
rFirst = nde.randomFirst * (60 * 60 * 1000);
rLast = nde.randomLast * (60 * 60 * 1000);
} else if (nde.randomUnits === "days") {
rFirst = nde.randomFirst * (24 * 60 * 60 * 1000);
rLast = nde.randomLast * (24 * 60 * 60 * 1000);
}
setTimeout( () => {
passMsgToLinks(RED.nodes.getNodeLinks( nde ), msg)
}, rFirst + ((rLast - rFirst) * Math.random()));
return
}
break
case "http request":
if ( nde.method == "GET" ) {
let url = msg.url || nde.url
let hdrs = {};
(nde.headers || []).forEach( hdr => {
hdrs[hdr.keyValue || hdr.keyType] = (
hdr.valueValue || hdr.valueType
)
})
hdrs = { ...hdrs, ...(msg.headers || {}) }
let typeFromRet = (ret) => {
if ( ret == "txt" ) {
return "text"
} else if ( ret == "obj" ) {
return "json"
} else {
return undefined
}
}
$.get({
url: url,
headers: hdrs,
dataType: typeFromRet(nde.ret),
crossOrigin: true,
}).done( data => {
if ( nde.ret == "txt" ) {
msg.payload = data.toString("utf8")
} else if ( nde.ret == "bin" ) {
msg.payload = data
} else {
msg.payload = data
}
passMsgToLinks(RED.nodes.getNodeLinks( nde ), msg)
}).fail( data => {
RED.notify( "Error requesting: " + url, "error")
console.log( "error requesting: " + url, data )
})
return
}
break
case "join":
if ( nde.mode == "custom" && nde.build == "array" &&
(nde.propertyType == "msg" || nde.propertyType == "full")) {
executionState[nde.id] = executionState[nde.id] || []
if ( nde.propertyType == "full" ) {
executionState[nde.id].push( msg )
} else {
executionState[nde.id].push( msg[nde.property] )
}
if ( executionState[nde.id].length == parseInt(nde.count) ) {
msg.payload = [...executionState[nde.id]];
delete executionState[nde.id]
passMsgToLinks(RED.nodes.getNodeLinks( nde ), msg);
}
return;
}
break
case "json":
let data = msg[nde.property]
let toStr = (d,p) => {
if ( p ) {
return JSON.stringify(d, null, 4)
} else {
return JSON.stringify(d)
}
}
if ( nde.action == "" ) {
if ( typeof data == "string" ) {
msg[nde.property] = JSON.parse(data)
} else {
msg[nde.property] = toStr(data,nde.pretty)
}
} else if ( nde.action == "str" ) {
msg[nde.property] = toStr(data,nde.pretty)
} else {
msg[nde.property] = JSON.parse(data)
}
passMsgToLinks(RED.nodes.getNodeLinks( nde ), msg);
return
case "link call":
// TOOD: ------
// TODO: handle the timeout value set on the node
// TODO: ------
msg._linkSource = msg._linkSource || []
msg._linkSource.push( nde.id )
if ( nde.linkType == "static" ) {
nde.links.forEach( ndeid => {
captureExceptionExecuteNode(RED.nodes.node(ndeid), msg)
})
}
if ( nde.linkType == "dynamic" ) {
if ( msg.target ) {
var mth = msg.target.match(/^([a-z0-9]{16})$/i)
if ( mth ) {
captureExceptionExecuteNode(
RED.nodes.node(mth[1]), msg
)
return
}
var foundNode = false
RED.nodes.eachNode( nde => {
if ( nde.name === msg.target ) {
captureExceptionExecuteNode(nde, msg)
foundNode = true
}
})
if ( foundNode ) return
}
RED.notify(
"Target not found Link Call ("+ nde.id +")", "error"
)
}
return
case "link out":
if ( nde.mode == "link" ) {
nde.links.forEach( ndeid => {
// if you end up here with a node that was null, then
// the link out node has stale links -- i.e. node ids
// that no longer exist in the flow.
var trgNde = RED.nodes.node(ndeid)
if ( !trgNde ) {
console.warn(
"Missing node for link id: " + ndeid +
" stale flow, check link out node: " + nde.id
)
} else {
captureExceptionExecuteNode(trgNde, msg)
}
})
return
}
if ( nde.mode == "return" ) {
let lnkndeid = msg._linkSource.pop()
if ( lnkndeid ) {
// don't execute the node at the end of the lnkndeid
// since it's a link call node, so we pass the message
// on to all the wires connected to the link call node
passMsgToLinks(RED.nodes.getNodeLinks(
RED.nodes.node(lnkndeid)
), msg);
} else {
RED.notify(
"Error: got to link return but no nodeid","error"
)
console.log( "no linkSource for return", [nde, msg])
}
return
}
break
case 'subflow':
// we get here from the inside of a subflow. A subflow
// calls this and eventually it ends with an out node
// which then triggers the original node with the msg.
// The status node triggers a status update for the original
// node.
if ( nde.direction == "out" ) {
var evtId = msg._subflowOut.pop()
var ndeId = evtId.split(":")[1]
passMsgToLinks(RED.nodes.getNodeLinks(
RED.nodes.node(ndeId)
), msg);
return
}
if ( nde.direction == "status" ) {
var evtId = msg._subflowStatus.pop()
var ndeId = evtId.split(":")[1]
if ( typeof msg.status == "object" ) {
emitStatusForNode(ndeId, msg.status)
}
return
}
break
case 'switch':
if ( nde.property && nde.propertyType == "msg" ) {
let val = RED.utils.getMessageProperty(
msg,nde.property
)
let correctness = nde.rules.map( rle => {
let tst = NodeRedBackendCode.switchOperators[rle.t] || (() => {return false})
try {
return tst(val,rle.v,rle.v2)
} catch (ex) {
logExceptionToDebug(ex,nde,msg)
return false
}
})
let lnks = []
if ( nde.checkall == "true" ) {
RED.nodes.getNodeLinks( nde ).forEach( lnk => {
if ( correctness[lnk.sourcePort] ) {
lnks.push( lnk )
}
})
} else {
for ( var idx = 0 ; idx < correctness.length ; idx++){
if ( correctness[idx] ) {
RED.nodes.getNodeLinks( nde ).forEach( lnk => {
if ( lnk.sourcePort == idx ) lnks.push(lnk)
})
break
}
}
}
passMsgToLinks(lnks, msg);
return
} else {
nodeTypeNotSupported(nde, "propertyType can only be msg")
return
}
break
case "template":
if ( nde.output != "str" ) {
nodeTypeNotSupported(nde, "output may only be <b>plain text</b>")
return
}
if ( nde.fieldType != "msg" ) {
nodeTypeNotSupported(nde, `unsupported field type <b>${nde.fieldType}</b>`)
return
}
if ( nde.syntax == "plain" ) {
msg[nde.field] = nde.template
} else if ( nde.syntax == "mustache" ) {
msg[nde.field] = window.Mustache.render(nde.template,msg)
} else {
nodeTypeNotSupported(nde, `Unknown format: <b>${nde.syntax}</b>`)
return
}
passMsgToLinks(RED.nodes.getNodeLinks( nde ), msg);
return
case "yaml":
let yamlData = msg[nde.property]
if ( typeof yamlData === "object" ) {
msg[nde.property] = jsyaml.dump(yamlData)
} else {
msg[nde.property] = jsyaml.load(yamlData)
}
passMsgToLinks(RED.nodes.getNodeLinks( nde ), msg);
return
case 'xml':
let xmlData = msg[nde.property]
if ( typeof xmlData == "string" ) {
msg[nde.property] = window.x2js.xml_str2json(xmlData)
} else if ( typeof xmlData == "object" ) {
msg[nde.property] = window.x2js.json2xml_str(xmlData)
}
passMsgToLinks(RED.nodes.getNodeLinks( nde ), msg);
return
//
// leave the inject here, it falls through, i.e. no break or return
//
case "inject":
var handleType = (nde,prp,msg) => {
switch ( prp.vt ) {
case "num":
msg[prp.p] = Number( prp.v )
break
case "bool":
case "json":
msg[prp.p] = JSON.parse( prp.v )
break
case "jsonata":
msg[prp.p] = jsonata(prp.v.replace(/\$\$[.]/g,"$").replace(/msg[.]/g,"$")).evaluate(msg,msg)
break
case "str":
msg[prp.p] = prp.v
break
case "date":
msg[prp.p] = Date.now()
break
case "bin":
var data = JSON.parse(prp.v);
if (Array.isArray(data) || (typeof(data) === "string")) {
msg[prp.p] = new ArrayBuffer(data);
}
else {
// TODO: generate error here.
}
break
}
};
// __user_inject_props__ is generated by the "inject now" button
// on the inject node - it's designed to dynamically inject
// data into the flow without redeployment
nde.props.concat(msg.__user_inject_props__ || []).forEach(prp => {
if ( prp.p == "payload" ) {
handleType(nde, { p: prp.p,
v: nde.payload,
vt: nde.payloadType }, msg)
} else if ( prp.p == "topic" ) {
handleType(nde, { p: prp.p,
v: prp.v || nde.topic,
vt: prp.vt }, msg)
} else {
handleType(nde, prp, msg)
}
})
delete msg.__user_inject_props__
// Intentionally no break or return here, its meant to
// fall through.
case "link in":
case "junction":
passMsgToLinks(RED.nodes.getNodeLinks( nde ), msg);
return;
}
nodeTypeNotSupported(nde)
}
// as the name says: capture the exceptions during execution
function captureExceptionExecuteNode(nde, msg) {
if ( !nde ) {
console.error( "captureExceptionExecuteNode: Node was null", msg)
return
}
try {
executeNode(nde, msg)
} catch ( ex ) {
RED.notify( `Error executing '${RED.utils.getNodeLabel(nde)}' of type '${nde.type}' with id ${nde.id}: ${ex.message}`, "error");
logExceptionToDebug(ex,nde,msg)
}
}
function passMsgToLinks(links, msg) {
links.forEach( lnk => {
let nde = (
RED.nodes.node(lnk.target.id) ||
RED.nodes.junction(lnk.target.id)
)
// this is the end of a subflow run
if ( !nde && lnk.target.type == "subflow" ) {
nde = lnk.target
}
// this should not happen and if it does, then we're dealing
// with some monster.
if ( !nde ) {
console.error("*** NO target found for LINK", lnk)
}
// off-thread
setTimeout( () => {
captureExceptionExecuteNode(nde, cloneIt(msg))
},0)
})
}
// this is the functionality for the flow compare sidebar - FlowCompareCfg
// It's the same as the found in the FlowCompare node -->
// https://flows.nodered.org/node/@gregoriusrippenstein/node-red-contrib-flowcompare
function compareFlows(msg) {
var oldFlowRevision = {};
var newFlowRevision = {};
for (var idx = 0; idx < msg.payload.length; idx++) {
oldFlowRevision[msg.payload[idx].id] = msg.payload[idx]
}
for (var idx = 0; idx < msg.new_flowdata.length; idx++) {
newFlowRevision[msg.new_flowdata[idx].id] = msg.new_flowdata[idx]
}
var changes = []
/* nodes that have been deleted */
for (var idx = 0; idx < msg.payload.length; idx++) {
var oldObj = msg.payload[idx];
if (!newFlowRevision[oldObj.id]) {
changes.push({
type: "deleted",
id: oldObj.id,
oldObj: oldObj,
newObj: undefined
})
}
}
for (var idx = 0; idx < msg.new_flowdata.length; idx++) {
var newObj = msg.new_flowdata[idx];
var oldObj = oldFlowRevision[newObj.id];
if (!oldObj) {
changes.push({
type: "added",
id: newObj.id,
oldObj: undefined,
newObj: newObj
})
} else {
if (JSON.stringify(oldObj) != JSON.stringify(newObj)) {
changes.push({
type: "changed",
id: newObj.id,
oldObj: oldObj,
newObj: newObj
})
}
}
}
return changes;
}
// redirect those requests that demonstrate certain functionality
// to the deadred server.
let deadredRedirectablesAjax = [
"NodeFactorySidebarCfg"
];
// we assume that RED is defined.
$.ajaxPrefilter(function( options, originalOptions, jqXHR ) {
let mth = undefined;
// patial functionality provided by the deadred backend
if ( deadredRedirectablesAjax.indexOf( options.url ) > -1 ) {