nl_tokens: / * Check if whether tagNames is given a node is an element or an element matching tagNames .
pl_tokens: function isElement ( node , tagNames ) { var name if ( ! ( tagNames === null || tagNames === undefined || typeof tagNames === 'string' || ( typeof tagNames === 'object' && tagNames . length !== 0 ) ) ) { throw new Error ( 'Expected `string` or `Array.<string>` for `tagNames`, not `' + tagNames + '`' ) } if ( ! node || typeof node !== 'object' || node . type !== 'element' || typeof node . tagName !== 'string' ) { return false } if ( tagNames === null || tagNames === undefined ) { return true } <mask> = node . tagName if ( typeof tagNames === 'string' ) { return name === tagNames } return tagNames . indexOf ( name ) !== - 1 }