If you get this error in Angular+Typescript+NgRX:
You can use the spread operator to take a shallow copy of a readonly object to make it readable, however you may not want this depending on your situation.
let x = [...y];
If you’re using Redux / NgRX, there’s a chance your selector could be returning a readonly object with a reference to the store, which can throw exceptions when trying to alter that object property via template binding. Depending on your situation, you can take a deep copy to remove the store reference.
let x = JSON.parse(JSON.stringify(y));