function getEventDirectives(startTag, sourceCode) {
  return utils.getDirectives(startTag, 'on').map((attribute) => ({
    name: attribute.key.argument
      ? sourceCode.getText(attribute.key.argument)
      : '',
    node: attribute.key,
    modifiers: attribute.key.modifiers.map((modifier) => modifier.name)
  }))
}
Finds and returns all keys for event directives

@param {VStartTag} startTag Element startTag
@param {SourceCode} sourceCode The source code object.
@returns {EventDirective[]} [{ name, node, modifiers }]