Function getClassListFromValue

packages/core/src/animation/utils.ts:270–280

(value: string | AnimationClassBindingFn)

 * Gets the list of classes from a passed in value
 */
export function getClassListFromValue(value: string | AnimationClassBindingFn): string[] | null {
  const classes = typeof value === 'function' ? value() : value;
  let classList: string[] | null = Array.isArray(classes) ? classes : null;
  if (typeof classes === 'string') {
    classList = classes
      .trim()
      .split(/\s+/)
      .filter((k) => k);
  }
  return classList;
}

/**
 * Cancels any running enter animations on a given element to prevent them from interfering