err "The requested module does not provide an export named 'default'"

[Mehran☺]

in line 79 of index.js
Use the 'default' keyword when exporting a value from a file .
like :
79 export default function franc(value, options) {
80 return francAll(value, options)[0][0]
81 }

[Titus]

See the readme. Use import {franc} from 'franc'. Not import franc from 'franc'