Function getParam

getParam<T extends string>(paramName: T): Param<T>
Checks if a URL parameter exists and returns its value.
Useful for debugging, feature flags, and configuration.
Type Parameters
- T extends string
Parameters
- paramName: T
  The URL parameter name to check
Returns Param<T>
- true if the parameter exists without a value (e.g. ?debug)
- false if the parameter doesn't exist or is set to 0
- The numeric value if it's a number (e.g. ?level=5 returns 5)
- The string value otherwise (e.g. ?name=test returns "test")
Example: Check debug mode
```
if (getParam("debug")) {
  console.log("Debug mode enabled");
}
```
Example: Get a numeric value
```
const level = getParam("level"); // Returns number if ?level=5
```