Change the minimum "supported" version of the Safari-browser to Safari 10

[Snuffleupagus]

According to https://github.com/mozilla/pdf.js/wiki/Frequently-Asked-Questions#faq-support, Safari 9 is still listed as "mostly supported".

Given that the last release from the Safari 9 branch was on September 1, 2016, it's questionable at least to me if it actually makes sense for us to even pretend to "support" such an old browser.
Especially when the first release from the Safari 10 branch was on September 20, 2016, which is now over four years ago.

Based on the MDN compatibility data, this patch thus removes the following polyfills:

• TypedArray.prototype.slice(), see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/slice#Browser_compatibility
• String.prototype.codePointAt(), see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/codePointAt#Browser_compatibility
• String.fromCodePoint(), see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/fromCodePoint#Browser_compatibility

[timvandermeij]

I fully agree with this, and anything higher than Safari 9 (which is way too old in my opinion as well) seems reasonable to me. Let's indeed stick with >= 10 for now, and we can always increase the number later on if the need arises, but this seems like a small change that will give us some clean-up.

[Snuffleupagus]

Something else, which I just spotted the other day, is that the update to Webpack 5 changed some default values. Note how there's now an Arrow function being used as part of the Webpack-header even in our es5-files, see e.g.

pdf.js/es5/build/pdf.js

Line 33 in 917fbf0

return /******/ (() => { // webpackBootstrap

This can obviously be fixed by tweaking some configuration options, however looking at https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions#Browser_compatibility I'm not convinced that we need to do that if we accept this patch since all browsers that we support should then have native Arrow function support.

[Snuffleupagus]

/botio-linux preview

[pdfjsbot]

From: Bot.io (Linux m4)

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Live output at: http://54.67.70.0:8877/983a5d04b6bd381/output.txt

[pdfjsbot]

From: Bot.io (Linux m4)

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Full output at http://54.67.70.0:8877/983a5d04b6bd381/output.txt

Total script time: 4.17 mins

Published

• Viewer: http://54.67.70.0:8877/983a5d04b6bd381/web/viewer.html
• Viewer (ES5): http://54.67.70.0:8877/983a5d04b6bd381/es5/web/viewer.html

[timvandermeij]

Looks good to me. I'll update the FAQ page.

[Snuffleupagus]

I'll update the FAQ page.

Thanks for doing this!

Looking more closely on that list, I do wonder if we actually need to keep the "Safari 9 and below"-line since it honestly seems redundant now; I'd suggest just removing it.
Also, the "Android 4 and below"-line seems useless as well given that e.g. Android 5 is way too old to be supported; hence I'd suggest just removing this one too.

[timvandermeij]

I agree; it's removed now.