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Add eslint rules to guard against unexpected imports/exports #28513

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Add eslint rules to guard against unexpected imports/exports #28513

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@kevin940726 kevin940726 commented Jan 27, 2021

Description

Fix #28510.

Add eslint-plugin-import and enable the import/default and import/named rules.

A typo is introduced in #28176, after briefly discussed on Slack, I think it's best to update the linter to guard against these kinds of bugs.

This PR also fixes the errors found by the linter.

How has this been tested?

Only apply the first commit of this PR and run the linter:

npm run lint-js

Observe that there're errors reported.

After applying all the changes, run the linter again, observe that there're no more errors.

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.
@kevin940726 kevin940726 force-pushed the update/add-eslint-plugin-import branch from b3d4f27 to 0536de7 Jan 27, 2021
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@kevin940726 kevin940726 marked this pull request as draft Jan 27, 2021
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@gziolo gziolo commented Jan 28, 2021

Great idea to add those rules. I see there are several violations to fix first, though.

If you want to add it to the ESLint plugin with WordPress configs, I would recommend starting with the warning level to not fail their CI checks after a minor update of dependencies. This is a common strategy that other ESLint plugins use to roll out more strict checks gradually. Even looking at Gutenberg changes necessary to satisfy linter - it's a breaking change. The approach we used in the past was marking new rules at warning level in the package and promote to an error in the Gutenberg repo.
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@kevin940726 kevin940726 commented Jan 28, 2021

@gziolo That's an excellent idea! Will try!
kevin940726 added 4 commits Jan 27, 2021
@kevin940726
Add eslint-plugin-import and enable default and named rules
97fe338
@kevin940726
Fix the rest errors
49fbe78
@kevin940726
Update changelog
ef632c2
@kevin940726
Warn it first to prevent breaking change
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1ec8e2d
@kevin940726 kevin940726 force-pushed the update/add-eslint-plugin-import branch from 0946c12 to 1ec8e2d Jan 29, 2021
@kevin940726
Add eslint-plugin-import to root devDeps
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@kevin940726 kevin940726 marked this pull request as ready for review Jan 29, 2021
@gziolo
gziolo reviewed Jan 29, 2021
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@gziolo gziolo left a comment

Everything looks great as it goes for the ESLint changes.

There is some usual dance left with rebases and the package lock file.
packages/eslint-plugin/CHANGELOG.md
## 8.0.1 (2021-01-28)

### Bug Fix

- Add missing `eslint-plugin-import` npm dependency ([#28545](https://github.com/WordPress/gutenberg/pull/28545)).

## 8.0.0 (2021-01-21)

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gziolo Jan 29, 2021
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It looks like a merge issue. It should not get removed.
package.json
@@ -157,6 +157,7 @@
"enzyme": "3.11.0",
"equivalent-key-map": "0.2.2",
"eslint-plugin-eslint-comments": "3.1.2",
"eslint-plugin-import": "2.22.1",

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gziolo Jan 29, 2021 •
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We use it in the whole project again 👍

You probably should rebase this branch again, remove the changes from the lock file and run npm i. There should be only one line updated. The package should have all deps hoisted.
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