Reevaluate jQuery dependency in PolisNet

[colinmegill]

https://github.com/pol-is/polis/blob/dev/client-admin/src/util/net.js

https://github.com/pol-is/polis/blob/dev/client-report/src/util/net.js

https://github.com/pol-is/polis/blob/dev/client-participation/js/util/net.js

We may be able to ditch it as it was used for ajax before fetch.

[colinmegill]

Fetch polyfills may not align with our browser support matrix.

[patcon]

Also something from the cy.server() docs to keep in mind if using fetch:

🚨 Please be aware that Cypress only currently supports intercepting XMLHttpRequests. Requests using the Fetch API and other types of network requests like page loads and <script> tags will not be intercepted or visible in the Command Log. You can automatically polyfill window.fetch to spy on and stub requests by enabling an experimental feature experimentalFetchPolyfill. See cypress-io/cypress#95 for more details and temporary workarounds.

[patcon]

Related? #453

[patcon]

Fetch polyfills may not align with our browser support matrix.

Current v3.2 fetch polyfill works on IE10+, and that holds true back to at least v1.0.0

This seems to align with our browser support goals for client-admin and client-report, but not client-participation #166

[patcon]

server?

https://github.com/node-fetch/node-fetch

client-participation? (IE8+)

• https://github.com/developit/unfetch
• https://github.com/camsong/fetch-ie8
• https://github.com/RubyLouvre/fetch-polyfill
• Use xhr.onreadystatechange for basic ie8 compatibility. JakeChampion/fetch#95
• IE8 and IE9 support JakeChampion/fetch#2 (comment)

Alternative: superagent node/browser for ie9+ https://github.com/visionmedia/superagent#browser

[patcon]

Re: cypress tests. cypress-io/cypress#95 (comment)

[patcon]

@colinmegill what's the story with Client-participation having another set of "net" utilities based around backbone? Could it be whittled down to just one? (Only seeing net/bbfetch actually being used in codebase rn)

https://github.com/pol-is/polis/tree/dev/client-participation/js/net