Detected the `delete` operator with computed key expressionsJS-0320

Deleting dynamically computed keys can be dangerous and in some cases not well optimized.

Using the delete operator on keys that aren't runtime constants could be a sign that you're using the wrong data structures. Using Objects with added and removed keys can cause occasional edge case bugs, such as if a key is named "hasOwnProperty". Consider using a Map or Set if you’re storing collections of objects.

Bad Practice

// Can be replaced with the constant equivalents, such as container.aaa
delete container['aaa'];
delete container['Infinity'];

// Dynamic, difficult-to-reason-about lookups
const name = 'name';
delete container[name];
delete container[name.toUpperCase()];

Recommended

const container: { [i: string]: number } = {
  /* ... */
};

// Constant runtime lookups by string index
delete container.aaa;

// Constants that must be accessed by []
delete container[7];
delete container['-Infinity'];