bootstrap-vue/src/utils/upper-first.js

BootstrapVue provides one of the most comprehensive implementations of Bootstrap 4 components and grid system for Vue.js and with extensive and automated WAI-ARIA accessibility markup.

/**
 * @param {string} str
 */
export default function upperFirst (str) {
  if (typeof str !== 'string') {
    str = String(str)
  }
  return str.charAt(0).toUpperCase() + str.slice(1)
}