@servicenow/library-enhanced-element/src/constant-case.js

Base element for Now Design System components

export default (value) => {
	const casedValue = value
		.replace(/([A-Z][a-z]+)/g, ' $&')
		.toUpperCase()
		.replace(/[ ]/g, '_');

	return casedValue[0] === '_' ? casedValue.substring(1) : casedValue;
};