Previously all browser globals were allowed to be used anywhere by
ESLint because we had set the `env` property to `browser` in the ESLint
config. This has made it easy to accidentally use browser globals
(e.g. #8338), so it has been removed. Instead we now have a short list
of allowed globals.
All browser globals are now accessed as properties on `window`.
Unfortunately this change resulted in a few different confusing unit
test errors, as some of our unit tests setup assumed that a particular
global would be used via `window` or `global`. In particular,
`window.fetch` didn't work correctly because it wasn't patched by the
AbortController polyfill (only `global.fetch` was being patched).
The `jsdom-global` package we were using complicated matters by setting
all of the JSDOM `window` properties directly on `global`, overwriting
the `AbortController` for example.
The `helpers.js` test setup module has been simplified somewhat by
removing `jsdom-global` and constructing the JSDOM instance manually.
The JSDOM window is set on `window`, and a few properties are set on
`global` as well as needed by various dependencies. `node-fetch` and
the AbortController polyfill/patch now work as expected as well,
though `fetch` is only available on `window` now.
* Remove unused state 'gas.basicPriceAndTimeEstimates'
* Check for invalid estimates from local storage
Gas estimates were being cached in local storage then later retrieved,
but the retrieved values were not being checked. If the data failed to
save, failed to load, or was cleared since being saved, it would result
in the gas estimates being set to undefined.
The estimates retrieved from local storage are now checked before they
are used. If they are falsy, the estimates are retrieved from the
network instead.
This should fix this Sentry issue:
[METAMASK-6W0T](https://sentry.io/share/issue/cfe470314a5741768b19050815322aa4/)
A few additional changes were made to the gas-duck tests to accommodate
the use of `sinon.restore`. `restore` is strongly recommended by the
`sinon` team, as neglecting to use it can result in memory leaks. It has
the additional benefit of ensuring you create fresh stubs/spies for each
test, which means they no longer need to be reset between tests.
