Changeset pages loaded directly without going through the homepage first sometimes are not rendered

[marco-c]

I tried to open https://firefox-code-coverage.herokuapp.com/#/changeset/3cee5c02db0a065f081989d3e0514563aac355ab and a blank page was rendered (with some var is undefined error in the web console, that I forgot to copy unfortunately).

It isn't the first time I can reproduce this.

[armenzg]

Where you trying to edit the URL and then pressed enter?

If you could please get the console errors that would be great.

I'm going to see if I can add sentry support so I can track frontend issues.

[marco-c]

Where you trying to edit the URL and then pressed enter?

I loaded that URL directly, clicking on a link in an email.

[marco-c]

I've just seen this again, on https://firefox-code-coverage.herokuapp.com/#/changeset/4cf7f246faed504f8568adcf786124f8aff88031.

In the web console:

Caricamento non riuscito per lo <script> con sorgente “https://firefox-code-coverage.herokuapp.com/runtime.6b263f20f7a98364ef41.js”. firefox-code-coverage.herokuapp.com:15
Caricamento non riuscito per lo <script> con sorgente “https://firefox-code-coverage.herokuapp.com/index.fefed9328283c97dc08b.js”. firefox-code-coverage.herokuapp.com:16

[armenzg]

How often does this happen?

That makes reference to the minified code and is not useful for debugging.
The issue did not make it all the way to sentry.io

Since we're open source, we can the source maps and that will make the devtool allow you to reach the original source:
#142

You might want to use Chrome to make the experience easier:
https://bugzilla.mozilla.org/show_bug.cgi?id=1441646

[armenzg]

I think source maps is working well: https://cl.ly/1L103W2x0o0y
It should be deployed soon.

[marco-c]

How often does this happen?

It happens pretty often on the first load of the website.

I'll report back once I reproduce again.

[armenzg]

Hi @marco-c this could be a side effect of #147 ?

I would like to close this issue in favour of that one since this one does not have enough data to be actionable.

[marco-c]

I haven't been able to reproduce this lately, so let's close it.

[marco-c]

I've been able to reproduce agan, and @jankeromnes was able to reproduce too.

[jankeromnes]

So we generate an email report with low-coverage changesets. Here is one email example:

• Bug 1462961 - Refactor to save a nsDisplayTransform* instead of just the transform matrix. r=jrmuizel: 0 covered out of 4 added.
• Bug 1462961 - Ensure the WebRenderLayerScrollData structure matches the APZ requirements. r=jrmuizel: 0 covered out of 10 added.

Clicking any link briefly flashes a "Return to main page" link, and then shows a completely blank page.

Console shows this:

TypeError: t is undefined
Stack trace:
Vn/<@https://firefox-code-coverage.herokuapp.com/index.7c17affb2da73a336c12.js:58:50649
Vn@https://firefox-code-coverage.herokuapp.com/index.7c17affb2da73a336c12.js:58:50633
render@https://firefox-code-coverage.herokuapp.com/index.7c17affb2da73a336c12.js:58:52725
p@https://firefox-code-coverage.herokuapp.com/index.7c17affb2da73a336c12.js:51:28494
beginWork@https://firefox-code-coverage.herokuapp.com/index.7c17affb2da73a336c12.js:51:30229
a@https://firefox-code-coverage.herokuapp.com/index.7c17affb2da73a336c12.js:51:42692
e@https://firefox-code-coverage.herokuapp.com/index.7c17affb2da73a336c12.js:51:43034
f@https://firefox-code-coverage.herokuapp.com/index.7c17affb2da73a336c12.js:51:43286
w@https://firefox-code-coverage.herokuapp.com/index.7c17affb2da73a336c12.js:51:46808
N@https://firefox-code-coverage.herokuapp.com/index.7c17affb2da73a336c12.js:51:46602
k@https://firefox-code-coverage.herokuapp.com/index.7c17affb2da73a336c12.js:51:45704
g@https://firefox-code-coverage.herokuapp.com/index.7c17affb2da73a336c12.js:51:45093
enqueueSetState@https://firefox-code-coverage.herokuapp.com/index.7c17affb2da73a336c12.js:51:19081
./node_modules/react/cjs/react.production.min.js/d.prototype.setState@https://firefox-code-coverage.herokuapp.com/index.7c17affb2da73a336c12.js:58:3439
fetchSetDiff/</<@https://firefox-code-coverage.herokuapp.com/index.7c17affb2da73a336c12.js:58:52284