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[RNMobile] Add Array.prototype.flatMap polyfill#28400

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fluiddot merged 2 commits intomasterfrom
rnmobile/fix/flatmap-polyfill
Jan 22, 2021
Merged

[RNMobile] Add Array.prototype.flatMap polyfill#28400
fluiddot merged 2 commits intomasterfrom
rnmobile/fix/flatmap-polyfill

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@fluiddot fluiddot commented Jan 21, 2021

gutenberg-mobile PR: wordpress-mobile/gutenberg-mobile#3035

Description

Adds a polyfill for Array.prototype.flatMap function (built-in flatMap) because the native version doesn't fully support it.

So far this wasn't needed because there were no references in the native version to that function but in a recent PR it was introduced in the logic related to converting HTML to blocks.

How has this been tested?

This is a fix related to the issue "Pasting a text with text styles applied generates a exception" so the same steps can be used for testing it:

  1. Add a paragraph block
  2. Write some words and set some of them as bold or italic
  3. Select all the text and copy it
  4. Paste it in the same paragraph or another one

Screenshots

Video capture of copy/paste text with text styles:

copy-paste-text-android.mp4

Types of changes

Bug fix

Checklist:

  • My code is tested.
  • My code follows the WordPress code style.
  • My code follows the accessibility standards.
  • My code has proper inline documentation.
  • I've included developer documentation if appropriate.
  • I've updated all React Native files affected by any refactorings/renamings in this PR.

The native version doesn't fully support the built-in function flatMap so we have to add a polyfill.
@fluiddot fluiddot added [Type] Bug An existing feature does not function as intended Mobile App - i.e. Android or iOS Native mobile impl of the block editor. (Note: used in scripts, ping mobile folks to change) labels Jan 21, 2021
@fluiddot fluiddot self-assigned this Jan 21, 2021
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Thanks for this fix @fluiddot ! 🙇 Tested and this addresses the crash. Seems like a sound solution to me, but this is not my area of expertise. @jsnjohnston, do you have any thoughts here?

@fluiddot fluiddot marked this pull request as ready for review January 22, 2021 08:27
@fluiddot fluiddot merged commit 2e8d260 into master Jan 22, 2021
@fluiddot fluiddot deleted the rnmobile/fix/flatmap-polyfill branch January 22, 2021 09:23
@github-actions github-actions bot added this to the Gutenberg 9.9 milestone Jan 22, 2021
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Thanks for this fix @fluiddot ! 🙇 Tested and this addresses the crash. Seems like a sound solution to me, but this is not my area of expertise. @jsnjohnston, do you have any thoughts here?

We discussed this internally with @mchowning and @jsnjohnston and we all agreed on applying this solution.

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jhnstn commented Jan 22, 2021

Forwarding my thoughts from chat over here:

I'm not too worried about this approach to polyfills in terms of maintenance. I doubt we will run into any issues there anytime soon. My only concern would be build size but that looks fine too.

I was also looking more into core-js and it seems babel will optimize the polyfill build to only include what is explicitly imported.

All and all this looks like the best approach to me, nice work @fluiddot !

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Mobile App - i.e. Android or iOS Native mobile impl of the block editor. (Note: used in scripts, ping mobile folks to change) [Type] Bug An existing feature does not function as intended

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