Support cyclic type declarations (#485) by joa · Pull Request #584 · babel/babel-eslint

joa · 2018-01-21T21:42:07Z

Using a type before its definition shouldn't trigger a no-use-before-define warning. Flow types should experience them same behavior as function declarations (they behave currently more like function expressions).

Cyclic type dependencies are common when using flow.
For instance:

type Node<T> = { head: T; tail: Node<T> }

Fixes #485

A type alias shouldn't trigger a no-use-before-define warning just like a function declaration. Cyclic type dependencies are common when using flow. For instance: type Node<T> = { head: T; tail: Node<T> } Fixes babel#485

xtuc · 2018-03-28T11:21:04Z

Sorry for the delay, we need to review your changes before we can merge this.

xtuc · 2018-03-28T11:24:16Z

+      node.expression = false;
+      node.params = [];
+      node.body = node.right;
+    }


Do we have some tests for the babylon-to-espress transform? That is surprising to me that this don't have any side effect?

https://github.com/babel/babel-eslint/blob/master/test/babel-eslint.js#L68

Shuliyey · 2018-04-02T08:55:00Z

👍

mdsib · 2018-06-14T20:49:58Z

Thanks for this! Is there anything stopping the merge?

mourner · 2018-07-31T14:13:05Z

@xtuc hey Sven, any news about this PR?

hzoo · 2018-09-25T18:39:39Z

Sorry, haven't been able to look at all this in a while! Thanks for the PR.

hzoo · 2018-09-25T18:49:19Z

Ok weird the test is failing on master

## The dependency [babel-eslint](https://github.com/babel/babel-eslint) was updated from `9.0.0` to `10.0.0`. This version is **not covered** by your **current version range**. If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update. --- <details> <summary>Release Notes for v10.0.0</summary> <h1>v10.0.0</h1> Small breaking change: add a peerDependency starting from the ESLint version that added a parser feature that we were monkeypatching before (and drop that code). If already using ESLint 5 shouldn't be any different. <ul> <li>Bugfix for <code>TypeAlias</code>: <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="290308427" data-permission-text="Issue title is private" data-url="babel/babel-eslint#584" href="https://urls.greenkeeper.io/babel/babel-eslint/pull/584">#584</a></li> </ul> <div class="highlight highlight-source-js"><pre>/* @flow */ type Node<T> = { head: T; tail: Node<T> } // or type File = {chunks: Array<Chunk>} type Chunk = {file: File}</pre></div> <ul> <li>Update to test against ESLint 5, add a peerDependency: <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="363695123" data-permission-text="Issue title is private" data-url="babel/babel-eslint#689" href="https://urls.greenkeeper.io/babel/babel-eslint/pull/689">#689</a></li> <li>Drop monkeypatching behavior: <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="363706472" data-permission-text="Issue title is private" data-url="babel/babel-eslint#690" href="https://urls.greenkeeper.io/babel/babel-eslint/pull/690">#690</a></li> </ul> </details> <details> <summary>Commits</summary> The new version differs by 5 commits. <ul> <li><a href="https://urls.greenkeeper.io/babel/babel-eslint/commit/8f78e280a22def1128cd847b73fd7f221a047ed2"><code>8f78e28</code></a> <code>10.0.0</code></li> <li><a href="https://urls.greenkeeper.io/babel/babel-eslint/commit/717fba7f5605f4dc1cc5531a7c24d5c9ab37a8a2"><code>717fba7</code></a> <code>test value should be switched</code></li> <li><a href="https://urls.greenkeeper.io/babel/babel-eslint/commit/020d012c554913fea137f4129798ce31a4896dfe"><code>020d012</code></a> <code>Treat type alias declarationlike function declaration (#584)</code></li> <li><a href="https://urls.greenkeeper.io/babel/babel-eslint/commit/b400cb1b38aaa8999d2a43f381f3ee861469ab98"><code>b400cb1</code></a> <code>Test eslint5, update peerDep (#690)</code></li> <li><a href="https://urls.greenkeeper.io/babel/babel-eslint/commit/c333bd64cb014cac8b56062421e9a5c0d28d798b"><code>c333bd6</code></a> <code>Drop old monkeypatching behavior (#689)</code></li> </ul> See the <a href="https://urls.greenkeeper.io/babel/babel-eslint/compare/6aa8b6f02ff83cfb14eae2432f226f113929a50f...8f78e280a22def1128cd847b73fd7f221a047ed2">full diff</a> </details> <details> <summary>FAQ and help</summary> There is a collection of [frequently asked questions](https://greenkeeper.io/faq.html). If those don’t help, you can always [ask the humans behind Greenkeeper](https://github.com/greenkeeperio/greenkeeper/issues/new). </details> --- Your [Greenkeeper](https://greenkeeper.io) bot 🌴

## The devDependency [babel-eslint](https://github.com/babel/babel-eslint) was updated from `9.0.0` to `10.0.0`. This version is **not covered** by your **current version range**. If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update. --- <details> <summary>Release Notes for v10.0.0</summary> <h1>v10.0.0</h1> Small breaking change: add a peerDependency starting from the ESLint version that added a parser feature that we were monkeypatching before (and drop that code). If already using ESLint 5 shouldn't be any different. <ul> <li>Bugfix for <code>TypeAlias</code>: <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="290308427" data-permission-text="Issue title is private" data-url="babel/babel-eslint#584" href="https://urls.greenkeeper.io/babel/babel-eslint/pull/584">#584</a></li> </ul> <div class="highlight highlight-source-js"><pre>/* @flow */ type Node<T> = { head: T; tail: Node<T> } // or type File = {chunks: Array<Chunk>} type Chunk = {file: File}</pre></div> <ul> <li>Update to test against ESLint 5, add a peerDependency: <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="363695123" data-permission-text="Issue title is private" data-url="babel/babel-eslint#689" href="https://urls.greenkeeper.io/babel/babel-eslint/pull/689">#689</a></li> <li>Drop monkeypatching behavior: <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="363706472" data-permission-text="Issue title is private" data-url="babel/babel-eslint#690" href="https://urls.greenkeeper.io/babel/babel-eslint/pull/690">#690</a></li> </ul> </details> <details> <summary>Commits</summary> The new version differs by 5 commits. <ul> <li><a href="https://urls.greenkeeper.io/babel/babel-eslint/commit/8f78e280a22def1128cd847b73fd7f221a047ed2"><code>8f78e28</code></a> <code>10.0.0</code></li> <li><a href="https://urls.greenkeeper.io/babel/babel-eslint/commit/717fba7f5605f4dc1cc5531a7c24d5c9ab37a8a2"><code>717fba7</code></a> <code>test value should be switched</code></li> <li><a href="https://urls.greenkeeper.io/babel/babel-eslint/commit/020d012c554913fea137f4129798ce31a4896dfe"><code>020d012</code></a> <code>Treat type alias declarationlike function declaration (#584)</code></li> <li><a href="https://urls.greenkeeper.io/babel/babel-eslint/commit/b400cb1b38aaa8999d2a43f381f3ee861469ab98"><code>b400cb1</code></a> <code>Test eslint5, update peerDep (#690)</code></li> <li><a href="https://urls.greenkeeper.io/babel/babel-eslint/commit/c333bd64cb014cac8b56062421e9a5c0d28d798b"><code>c333bd6</code></a> <code>Drop old monkeypatching behavior (#689)</code></li> </ul> See the <a href="https://urls.greenkeeper.io/babel/babel-eslint/compare/6aa8b6f02ff83cfb14eae2432f226f113929a50f...8f78e280a22def1128cd847b73fd7f221a047ed2">full diff</a> </details> <details> <summary>FAQ and help</summary> There is a collection of [frequently asked questions](https://greenkeeper.io/faq.html). If those don’t help, you can always [ask the humans behind Greenkeeper](https://github.com/greenkeeperio/greenkeeper/issues/new). </details> --- Your [Greenkeeper](https://greenkeeper.io) bot 🌴

pnevyk · 2018-09-27T08:50:41Z

This change (generally) breaks eslint plugins that use TypeAlias visitor. To me, changing node type from TypeAlias to FunctionDeclaration doesn't look like a correct solution (however, I have no insight into issue that is fixed by this). Is this going to be reverted?

hzoo · 2018-09-27T12:53:11Z

Yeah I think we will need to revert, was trying to look into the solution earlier

This reverts commit 020d012.

* Revert "Treat type alias declarationlike function declaration (#584)" This reverts commit 020d012.

Treat type alias declarationlike function declaration

c6c0053

A type alias shouldn't trigger a no-use-before-define warning just like a function declaration. Cyclic type dependencies are common when using flow. For instance: type Node<T> = { head: T; tail: Node<T> } Fixes babel#485

joa mentioned this pull request Jan 21, 2018

eslint warning no-use-before-define should not apply to flow types react/create-react-app#2103

Closed

xtuc reviewed Mar 28, 2018

View reviewed changes

daniel-wer mentioned this pull request Jul 11, 2018

Update eslint to v5, and eslint related plugins scalableminds/webknossos#2880

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gaearon mentioned this pull request Sep 9, 2018

Enable no-use-before-define rule react/react#13606

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hzoo merged commit 020d012 into babel:master Sep 25, 2018

hzoo mentioned this pull request Sep 25, 2018

Bump babel-eslint and remove flow supressions react/react#13727

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hzoo mentioned this pull request Sep 26, 2018

v10.0.0: TypeError: statements is not iterable #691

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pnevyk mentioned this pull request Sep 27, 2018

WIP: Bump versions of babel-eslint, eslint and eslint-config-canonical gajus/eslint-plugin-flowtype#359

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hzoo added a commit that referenced this pull request Sep 27, 2018

Revert "Treat type alias declarationlike function declaration (#584)"

52e3f79

This reverts commit 020d012.

hzoo mentioned this pull request Sep 27, 2018

Revert 584 #697

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hzoo added a commit that referenced this pull request Sep 27, 2018

Revert #584 (#697)

98c1f13

* Revert "Treat type alias declarationlike function declaration (#584)" This reverts commit 020d012.

This was referenced Sep 27, 2018

Update babel-eslint in / from 8.0.1 to 10.0.1 pcardune/redux-firebase-mirror#238

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Update 3 dependencies from npm JetBrains/ring-ui#428

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renovate Bot mentioned this pull request Jul 14, 2021

Update dependency babel-eslint to v10 genenotebook/genenotebook#198

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chore(deps): update babel monorepo (major) - autoclosed scratchfoundation/scratch-audio#168

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chore(deps): update babel monorepo (major) - autoclosed scratchfoundation/scratch-paint#1730

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Omrisnyk mentioned this pull request Feb 4, 2024

[Snyk] Fix for 12 vulnerabilities Omrisnyk/npm-lockfiles#142

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Support cyclic type declarations (#485)#584

Support cyclic type declarations (#485)#584
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