TypeError: actionArr.push is not a function

This error message indicates that the push method is being called on a variable that is not an array. The push method is used to add elements to the end of an array, but if it is called on a non-array variable, it will throw an error.

To resolve this error, you need to ensure that the variable you are calling push on is actually an array. You can use the typeof operator to check the type of the variable and make sure it is an array before calling push.

For example:

let actionArr = [];

if(typeof actionArr === "object" && actionArr instanceof Array) {
  actionArr.push("new element");
}

In this example, we use the typeof operator to check that actionArr is an "object" and the instanceof operator to check that it is an instance of Array. If both conditions are true, we can safely call the push method on actionArr.