Remove undefined properties and empty arrays from an object

Replace references to `undefined` with `void 0`

Undefined safe way of extracting object properties

return the first argument that is `!== undefined`

Check if a value is undefined or not.

This removes rvals that are equivalent to undefined wherever possible

TypeScript recursive conversion between optional (partial) and undefined properties.

ESlint rule for disallow redundant undefined

remark-lint rule to warn when references to undefined definitions are found

Validates if a value is undefined.

Copies an object without its undefined properties. 🫥

```typescript export function getTempName(prefix?: string | null | undefined): string;

Join urls or system paths, even with undefined values

undefined

Check if undefined.

Coalesce for JavaScript. Returns the first value that is not undefined or null.

Best type safe way to check null or undefined in typescript

Test if a value is undefined or null.

Checks if the given value is null or undefined

undefined