Function getQueryParam

getQueryParam(url: string, param: string): string | null
Returns the value of a query parameter from a URL string. Returns null if the parameter is absent or the URL is invalid.
Parameters
- url: string
  The URL string.
- param: string
  The query parameter name.
Returns string | null
Example
```
getQueryParam("https://example.com?q=hello", "q") // => "hello"
getQueryParam("https://example.com", "q")          // => null
```
- Defined in url/getQueryParam/index.ts:14