function isInstanceMethod(node) {
			switch (node.type) {
				case "MethodDefinition":
					return !node.static && node.kind !== "constructor";
				case "AccessorProperty":
				case "PropertyDefinition":
					return !node.static && enforceForClassFields;
				default:
					return false;
			}
		}
Check if the node is an instance method
@param {ASTNode} node node to check
@returns {boolean} True if its an instance method
@private