Function getContrastColor

getContrastColor(hexCode?: string): string
Determines the optimal contrast color (black or white) for text displayed on a given background color.

Uses the YIQ color space formula to calculate perceived brightness and returns either black (#000000) or white (#ffffff) for maximum readability.
Parameters
- hexCode: string = '#008000'
  A 3 or 6 character hexadecimal color code. The leading # is optional. Defaults to #008000 (green) if not provided.
Returns string
The contrasting color as a 6-character hex string with leading #. Returns #000000 (black) for light backgrounds or #ffffff (white) for dark backgrounds.
Example
```
// With 6-digit hex code
getContrastColor('#ff0000');
// => '#ffffff'
```
Example
```
// With 3-digit shorthand hex code
getContrastColor('000');
// => '#ffffff'
```
Example
```
// Light background returns black text
getContrastColor('#ffffff');
// => '#000000'
```
Example
```
// Dark background returns white text
getContrastColor('#000000');
// => '#ffffff'
```
Example
```
// Using default value
getContrastColor();
// => '#ffffff'
```
See
Color Space
- Defined in color/getContrastColor.ts:39