Function toStringFirst

toStringFirst(...colours: (undefined | Colourish)[]): string
Returns a CSS-ready string representation.
```
element.style.backgroundColor = resolveToString(`red`);
```
Tries each parameter in turn, returning the value for the first that resolves. This can be useful for having fallback values.
```
// Try a CSS variable, a object property or finally fallback to red.
element.style.backgroundColor = toStringFirst('--some-var', opts.background, `red`);
```
Parameters
- ...colours: (undefined | Colourish)[]
  Array of colours to resolve
Returns string