nl_tokens: Validates the encoding options .
pl_tokens: function validateEncodingOptions ( encodingOptions ) { if ( encodingOptions . <mask> ) { const mapConstructor = encodingOptions . map ; if ( typeof mapConstructor !== 'function' || typeof mapConstructor . prototype . forEach !== 'function' || typeof mapConstructor . prototype . set !== 'function' ) { throw new TypeError ( 'Map constructor not valid' ) ; } } if ( encodingOptions . set ) { const setConstructor = encodingOptions . set ; if ( typeof setConstructor !== 'function' || typeof setConstructor . prototype . forEach !== 'function' || typeof setConstructor . prototype . add !== 'function' ) { throw new TypeError ( 'Set constructor not valid' ) ; } } if ( ( encodingOptions . useBigIntAsLong || encodingOptions . useBigIntAsVarint ) && typeof BigInt === 'undefined' ) { throw new TypeError ( 'BigInt is not supported by the JavaScript engine' ) ; } }