function NodeContext(msg, nodeContext, parent, escapeStrings, cachedContextTokens) {
        this.msgContext = new mustache.Context(msg,parent);
        this.nodeContext = nodeContext;
        this.escapeStrings = escapeStrings;
        this.cachedContextTokens = cachedContextTokens;
    }
Custom Mustache Context capable to collect message property and node
flow and global context