Function validate

packages/prompts/src/group-multi-select.ts:211–223

(selected: Value[] | undefined)

		cursorAt: opts.cursorAt,
		selectableGroups,
		validate(selected: Value[] | undefined) {
			if (required && (selected === undefined || selected.length === 0))
				return `Please select at least one option.\n${styleText(
					'reset',
					styleText(
						'dim',
						`Press ${styleText(['gray', 'bgWhite', 'inverse'], ' space ')} to select, ${styleText(
							'gray',
							styleText(['bgWhite', 'inverse'], ' enter ')
						)} to submit`
					)
				)}`;
		},
		render() {
			const hasGuide = opts.withGuide ?? settings.withGuide;
			const title = `${hasGuide ? `${styleText('gray', S_BAR)}\n` : ''}${symbol(this.state)}  ${opts.message}\n`;