WIP - Adding ascent speed (stats + graph)

[redref]

Hello !

To begin, thank you for this amazing work, from a long time trail runner user ! And new app is just amazing ! Kudos to you 😉

Mostly beginning to enter the codebase as a non-front developer my side. For trail running, it would be nice to have ascent speed, so I tried to integrate it quite successfully for my use.

Now, I need to package this in a neat way, but it seems testsuite are failing my side (even without those changes)

    Details:

    /home/<>/soft/elevate/desktop/node_modules/serialize-error/index.js:1
    ({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,jest){import errorConstructors from './error-constructors.js';
                                                                                      ^^^^^^

    SyntaxError: Cannot use import statement outside a module

Any help / opinion / missing parts notice would be nice (and yeah, I am not good at JS internals 😉 ).