najax not present when using jQuery in v0.4/v0.5

[runspired]

I'm trying to update ember-data's fastboot tests from v0.2. v0.3 works fine.

Starting in 0.4 however @ember/jquery seems to fail to correctly import jquery into the vendor shim and thus no jQuery global is present. No other dependencies are being changed and our fastboot version, ember-source version, and @ember/jquery is the latest release in all cases.

I haven't been able to determine what changed between 0.3 and 0.4 to trigger this (there are very few changes that aren't dependency changes), but wanted to surface this here in case anyone using jQuery still bumps into an error telling them they need to install ember-fetch after upgrading to 0.4 or 0.5.

Edit: after looking through the codepaths it seems the jQuery global check was a red herring, it's always false in fastboot. When using jQuery najax needs to be installed, this used to be brought by fastboot itself but that support was changed in 3.x which v0.4 here bumped to (a deprecation would have been nice, but oh well). The solution here was to install the beta of ember-cli-fastboot 3.x, the latest fastboot, the latest najax, and to configure config/fastboot-testing.js

module.exports = {
  resilient: true,
  buildSandboxGlobals(defaultGlobals) {
    const additionalGlobals = {};
    try {
      const najax = require('najax'); // eslint-disable-line
      additionalGlobals.najax = najax;
    } catch (e) {
      // we only add the global if najax is installed
    }
    return Object.assign({}, defaultGlobals, additionalGlobals);
  },
};

[runspired]

I've traced this down to #328 from @thoov which bumped this to bring a version of fastboot (3.x) that isn't actually available via any version of ember-cli-fastboot (which uses fastboot 2.x). It seems the ember-fastboot project has failed to release a new version of ember-cli-fastboot in quite a long time.

While the jQuery issue isn't with this repo, I'd suggest downgrading fastboot to 2.x to match what users can actually install.