edtf.js

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The format() function throws a TypeError when passing in an interval. For example:

edtf.format(edtf.default('2000/2001'))

throws:

Uncaught TypeError: Cannot read properties of undefined (reading 'value')

It might be possible to format some intervals natively using Intl.DateTimeFormat.prototype.formatRange(). However, this API doesn’t accept other kinds of intervals, such as /2001 and ../2001. Ultimately, I’d like to be able to rely on this library to output something like “before 2001”.