Load timeout option

[lnalborczyk]

Hi,

thank you very much for creating and maintaining this package!

I am using it regularly to export my HTML5 slides (created using RStudio) into .pdf documents. This usually works fine, for instance I can export these slides (https://www.barelysignificant.com/IMSB2020/slides/Cours04) using the following command:

decktape generic https://www.barelysignificant.com/IMSB2020/slides/Cours04 Cours04.pdf

without problem.

However, when I try to export the following course (available online at https://www.barelysignificant.com/IMSB2020/slides/Cours05), the following command:

decktape generic https://www.barelysignificant.com/IMSB2020/slides/Cours05 Cours05.pdf

results in this error:

Loading page https://www.barelysignificant.com/IMSB2020/slides/Cours05 ...
TimeoutError: Navigation Timeout Exceeded: 20000ms exceeded
    at Promise.then (/usr/local/lib/node_modules/decktape/node_modules/puppeteer/lib/LifecycleWatcher.js:143:21)
  -- ASYNC --
    at Frame.<anonymous> (/usr/local/lib/node_modules/decktape/node_modules/puppeteer/lib/helper.js:108:27)
    at Page.waitForNavigation (/usr/local/lib/node_modules/decktape/node_modules/puppeteer/lib/Page.js:682:49)
    at Page.<anonymous> (/usr/local/lib/node_modules/decktape/node_modules/puppeteer/lib/helper.js:109:23)
    at /usr/local/lib/node_modules/decktape/decktape.js:219:21
    at process._tickCallback (internal/process/next_tick.js:68:7)

My guess is that this issue appears because this particular course contains interactive plots, created using the plotly package in R (https://plotly.com/r/), on slides 3 and 12...

Would you have any idea on how to solve this issue?

Best wishes,

Ladislas

[astefanutti]

Thanks a lot for the kind feedback.

I've just tried exporting the presentation by increasing the following timeout and it works:

decktape/decktape.js

Line 220 in 9874f9e

const load = page.waitForNavigation({ waitUntil: 'load', timeout: 20000 });

For some reasons, the presentation seems to take quite a lot of time to load. It defaults to 20s as it's long enough for presentations to load, and short enough to timeout and report when there is an issue.

A solution would be to add an option so that you can provide a longer timeout. Also, it may be worth analyse why this particular presentation takes more than 20s to load.

[lnalborczyk]

Thank you for your quick answer, it solved it!

My guess is that this specific presentation takes a long time to load because it contains several high resolution .svg figures, some interactive plots, and embedded external web pages (e.g., on slide 34).

[astefanutti]

Great! Yes it seems the presentation contain some large assets. It may be possible to have them lazy loaded. Anyway, I think it would be useful to have an option to override the default timeout.