How to use the boxen._borderStyles function in boxen
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sindresorhus / boxen-cli / cli.js View on Github 
function cleanupBorderStyle(borderStyle) {
if (!borderStyle) {
return 'single';
}
if (borderStyle in boxen._borderStyles) {
return borderStyle;
}
if (borderStyle.length !== 6) {
console.error('Specified custom border style is invalid');
process.exit(1);
}
// a string of 6 characters was given, make it a borderStyle object
return {
topLeft: borderStyle[0],
topRight: borderStyle[1],
bottomLeft: borderStyle[2],
bottomRight: borderStyle[3],
horizontal: borderStyle[4],
vertical: borderStyle[5]
