interface Options {
	/**
	Minimum value of the sparkline range.

	Values are scaled relative to this baseline. When not specified:
	- If `maximum` is set, defaults to `0` (for backwards compatibility)
	- Otherwise, defaults to the minimum value in the data
	*/
	readonly minimum?: number;

	/**
	Maximum value of the sparkline range.

	Values are scaled relative to this maximum. When not specified, defaults to the maximum value in the data.
	*/
	readonly maximum?: number;

	/**
	Apply color styling to the sparklines.

	The `'fire'` style uses a gradient from yellow to red. Each bar has a fixed width of one terminal column.

	@default 'fire'
	*/
	readonly style?: 'fire';
}

/**
Generate sparklines `▁▂▃▅▂▇`.

@param numbers - The numbers to create the sparkline from.

@example
```
import sparkly from 'sparkly';

sparkly([0, 3, 5, 8, 4, 3, 4, 10]);
//=> '▁▃▄▇▄▃▄█'

// Specifying anything other than finite numbers will cause holes
sparkly([0, 3, 5, '', 4, 3, 4, 10]);
//=> '▁▃▄ ▄▃▄█'

// Specifying minimum and/or maximum options will change the sparkline range
sparkly([1, 2, 3, 4, 5], {minimum: 0, maximum: 10});
//=> '▁▂▃▄▄'

// With only maximum set, minimum defaults to 0 for backwards compatibility
sparkly([10, 20, 30, 40, 50], {maximum: 100});
//=> '▁▂▃▄▄'

// Specifying a style option will change the sparkline color
sparkly([1, 2, 3, 4, 5, 6, 7, 8], {style: 'fire'});
//=> Colored sparkline (gradient from yellow to red)
```
*/
export default function sparkly(
	numbers: ReadonlyArray<number | ''>,
	options?: Options
): string;