nl_tokens: Produces a shallow clone of the object that is if JSON . stringify can handle it . <br > The object must be non - circular .
pl_tokens: function clone ( o , replacer ) { if ( typeof o === 'string' || typeof o === 'number' ) return o ; try { return JSON . parse ( JSON . stringify ( o , replacer ) ) ; } catch ( e ) { throw new Error ( 'Unable to clone object: ' + e . <mask> ) ; } }