Optimize do expression output #17444
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Only apply the flatten transform when the do expression contains Break/Continue/Return. This enables us to optimize the output since we don't have to memoize intermediate results.
JLHwung
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Spec: Do Expressions
PR: Output optimization 🔬
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variable declaration within for in/of can not have initializer.
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liuxingbaoyu
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Jul 21, 2025
| const uid = body.scope.generateDeclaredUidIdentifier("do"); | ||
| if (left.isVariableDeclaration()) { | ||
| const init = left.get("declarations")[0].get("init"); | ||
| if (init.node) { |
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This this PR add support for for (var i = 0 in {});?
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Good catch! I overlooked the sloppy mode, I will revert this part.
nicolo-ribaudo
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Jul 25, 2025
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![snyk-io[bot]](https://badgen.net/badge/icon/snyk-io%5Bbot%5D/green?label=)  [<img width="16" alt="Powered by Pull Request Badge" src="https://user-images.githubusercontent.com/1393946/111216524-d2bb8e00-85d4-11eb-821b-ed4c00989c02.png">](https://pullrequestbadge.com/?utm_medium=github&utm_source=reisene&utm_campaign=badge_info)<!-- PR-BADGE: PLEASE DO NOT REMOVE THIS COMMENT -->  <h3>Snyk has created this PR to upgrade @babel/core from 7.28.0 to 7.28.3.</h3> :information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project. <hr/> - The recommended version is **1 version** ahead of your current version. - The recommended version was released **a month ago**. #### Issues fixed by the recommended upgrade: | | Issue | Score | Exploit Maturity | :-------------------------:|:-------------------------|:-------------------------|:-------------------------  | Regular Expression Denial of Service (ReDoS)<br/>[SNYK-JS-BRACEEXPANSION-9789073](https://snyk.io/vuln/SNYK-JS-BRACEEXPANSION-9789073) | **57** | Proof of Concept  | Regular Expression Denial of Service (ReDoS)<br/>[SNYK-JS-BRACEEXPANSION-9789073](https://snyk.io/vuln/SNYK-JS-BRACEEXPANSION-9789073) | **57** | Proof of Concept <details> <summary><b>Release notes</b></summary> <br/> <details> <summary>Package name: <b>@babel/core</b></summary> <ul> <li> <b>7.28.3</b> - <a href="https://redirect.github.com/babel/babel/releases/tag/v7.28.3">2025-08-14</a></br><h2>v7.28.3 (2025-08-14)</h2> <h4>👓 Spec Compliance</h4> <ul> <li><code>babel-helper-create-class-features-plugin</code>, <code>babel-plugin-proposal-decorators</code>, <code>babel-plugin-transform-class-static-block</code>, <code>babel-preset-env</code> <ul> <li><a href="https://redirect.github.com/babel/babel/pull/17443" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/17443/hovercard">#17443</a> [static blocks] Do not inject new static fields after static code (<a href="https://redirect.github.com/nicolo-ribaudo">@ nicolo-ribaudo</a>)</li> </ul> </li> </ul> <h4>🐛 Bug Fix</h4> <ul> <li><code>babel-parser</code> <ul> <li><a href="https://redirect.github.com/babel/babel/pull/17465" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/17465/hovercard">#17465</a> fix(parser/typescript): parse <code>import("./a", {with:{},})</code> (<a href="https://redirect.github.com/easrng">@ easrng</a>)</li> <li><a href="https://redirect.github.com/babel/babel/pull/17478" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/17478/hovercard">#17478</a> fix(parser): stop subscript parsing on async arrow (<a href="https://redirect.github.com/JLHwung">@ JLHwung</a>)</li> </ul> </li> </ul> <h4>💅 Polish</h4> <ul> <li><code>babel-plugin-transform-regenerator</code>, <code>babel-plugin-transform-runtime</code> <ul> <li><a href="https://redirect.github.com/babel/babel/pull/17363" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/17363/hovercard">#17363</a> Do not save last yield in call in temp var (<a href="https://redirect.github.com/nicolo-ribaudo">@ nicolo-ribaudo</a>)</li> </ul> </li> </ul> <h4>📝 Documentation</h4> <ul> <li><a href="https://redirect.github.com/babel/babel/pull/17448" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/17448/hovercard">#17448</a> move eslint-{parser,plugin} docs to the website (<a href="https://redirect.github.com/JLHwung">@ JLHwung</a>)</li> </ul> <h4>🏠 Internal</h4> <ul> <li><a href="https://redirect.github.com/babel/babel/pull/17454" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/17454/hovercard">#17454</a> Enable type checking for <code>scripts</code> and <code>babel-worker.cjs</code> (<a href="https://redirect.github.com/JLHwung">@ JLHwung</a>)</li> </ul> <h4>🔬 Output optimization</h4> <ul> <li><code>babel-plugin-proposal-destructuring-private</code>, <code>babel-plugin-proposal-do-expressions</code> <ul> <li><a href="https://redirect.github.com/babel/babel/pull/17444" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/17444/hovercard">#17444</a> Optimize do expression output (<a href="https://redirect.github.com/JLHwung">@ JLHwung</a>)</li> </ul> </li> </ul> <h4>Committers: 5</h4> <ul> <li>Babel Bot (<a href="https://redirect.github.com/babel-bot">@ babel-bot</a>)</li> <li>Huáng Jùnliàng (<a href="https://redirect.github.com/JLHwung">@ JLHwung</a>)</li> <li>Jam Balaya (<a href="https://redirect.github.com/JamBalaya56562">@ JamBalaya56562</a>)</li> <li>Nicolò Ribaudo (<a href="https://redirect.github.com/nicolo-ribaudo">@ nicolo-ribaudo</a>)</li> <li>easrng (<a href="https://redirect.github.com/easrng">@ easrng</a>)</li> </ul> </li> <li> <b>7.28.0</b> - <a href="https://redirect.github.com/babel/babel/releases/tag/v7.28.0">2025-07-02</a></br><h2>v7.28.0 (2025-07-02)</h2> <h4>🚀 New Feature</h4> <ul> <li><code>babel-node</code> <ul> <li><a href="https://redirect.github.com/babel/babel/pull/17147" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/17147/hovercard">#17147</a> Support top level await in node repl (<a href="https://redirect.github.com/liuxingbaoyu">@ liuxingbaoyu</a>)</li> </ul> </li> <li><code>babel-types</code> <ul> <li><a href="https://redirect.github.com/babel/babel/pull/17258" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/17258/hovercard">#17258</a> feat(matchesPattern): support super/private/meta (<a href="https://redirect.github.com/JLHwung">@ JLHwung</a>)</li> </ul> </li> <li><code>babel-compat-data</code>, <code>babel-preset-env</code> <ul> <li><a href="https://redirect.github.com/babel/babel/pull/17355" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/17355/hovercard">#17355</a> Add explicit resource management to preset-env (<a href="https://redirect.github.com/JLHwung">@ JLHwung</a>)</li> </ul> </li> <li><code>babel-core</code>, <code>babel-parser</code> <ul> <li><a href="https://redirect.github.com/babel/babel/pull/17390" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/17390/hovercard">#17390</a> Support <code>sourceType: "commonjs"</code> (<a href="https://redirect.github.com/JLHwung">@ JLHwung</a>)</li> </ul> </li> <li><code>babel-generator</code>, <code>babel-parser</code> <ul> <li><a href="https://redirect.github.com/babel/babel/pull/17346" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/17346/hovercard">#17346</a> Materialize <code>explicitResourceManagement</code> parser plugin (<a href="https://redirect.github.com/JLHwung">@ JLHwung</a>)</li> </ul> </li> <li><code>babel-plugin-proposal-destructuring-private</code>, <code>babel-plugin-proposal-do-expressions</code>, <code>babel-plugin-transform-object-rest-spread</code>, <code>babel-traverse</code>, <code>babel-types</code> <ul> <li><a href="https://redirect.github.com/babel/babel/pull/17391" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/17391/hovercard">#17391</a> LVal coverage updates (Part 2) (<a href="https://redirect.github.com/JLHwung">@ JLHwung</a>)</li> </ul> </li> <li><code>babel-parser</code>, <code>babel-traverse</code>, <code>babel-types</code> <ul> <li><a href="https://redirect.github.com/babel/babel/pull/17378" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/17378/hovercard">#17378</a> Accept bigints in <code>t.bigIntLiteral</code> factory (<a href="https://redirect.github.com/JLHwung">@ JLHwung</a>)</li> </ul> </li> <li><code>babel-generator</code>, <code>babel-plugin-proposal-destructuring-private</code>, <code>babel-plugin-proposal-discard-binding</code>, <code>babel-plugin-transform-destructuring</code>, <code>babel-plugin-transform-explicit-resource-management</code>, <code>babel-plugin-transform-react-display-name</code>, <code>babel-types</code> <ul> <li><a href="https://redirect.github.com/babel/babel/pull/17277" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/17277/hovercard">#17277</a> Transform discard binding (<a href="https://redirect.github.com/JLHwung">@ JLHwung</a>)</li> </ul> </li> <li><code>babel-generator</code>, <code>babel-parser</code>, <code>babel-plugin-proposal-destructuring-private</code>, <code>babel-plugin-transform-block-scoping</code>, <code>babel-plugin-transform-object-rest-spread</code>, <code>babel-plugin-transform-typescript</code>, <code>babel-traverse</code>, <code>babel-types</code> <ul> <li><a href="https://redirect.github.com/babel/babel/pull/17163" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/17163/hovercard">#17163</a> Parse discard binding (<a href="https://redirect.github.com/JLHwung">@ JLHwung</a>)</li> </ul> </li> </ul> <h4>🐛 Bug Fix</h4> <ul> <li><code>babel-helper-globals</code>, <code>babel-plugin-transform-classes</code>, <code>babel-traverse</code> <ul> <li><a href="https://redirect.github.com/babel/babel/pull/17297" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/17297/hovercard">#17297</a> Create babel-helper-globals (<a href="https://redirect.github.com/JLHwung">@ JLHwung</a>)</li> </ul> </li> <li><code>babel-types</code> <ul> <li><a href="https://redirect.github.com/babel/babel/pull/17009" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/17009/hovercard">#17009</a> feature: TSTypeOperator: keyof (<a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="2502652054" data-permission-text="Title is private" data-url="babel/babel#16799" data-hovercard-type="issue" data-hovercard-url="/babel/babel/issues/16799/hovercard" href="https://redirect.github.com/babel/babel/issues/16799">#16799</a>) (<a href="https://redirect.github.com/coderaiser">@ coderaiser</a>)</li> </ul> </li> </ul> <h4>🏠 Internal</h4> <ul> <li><code>babel-compat-data</code>, <code>babel-plugin-proposal-decorators</code>, <code>babel-plugin-transform-async-generator-functions</code>, <code>babel-plugin-transform-json-modules</code>, <code>babel-plugin-transform-regenerator</code>, <code>babel-plugin-transform-runtime</code>, <code>babel-preset-env</code>, <code>babel-runtime-corejs3</code> <ul> <li><a href="https://redirect.github.com/babel/babel/pull/17403" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/17403/hovercard">#17403</a> Update <code>babel-polyfill</code> packages (<a href="https://redirect.github.com/nicolo-ribaudo">@ nicolo-ribaudo</a>)</li> </ul> </li> </ul> <h4>Committers: 5</h4> <ul> <li>Babel Bot (<a href="https://redirect.github.com/babel-bot">@ babel-bot</a>)</li> <li>Huáng Jùnliàng (<a 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Sep 29, 2025
 <h3>Snyk has created this PR to upgrade @babel/runtime from 7.28.3 to 7.28.4.</h3> :information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project. <hr/> - The recommended version is **1 version** ahead of your current version. - The recommended version was released **22 days ago**. <details> <summary><b>Release notes</b></summary> <br/> <details> <summary>Package name: <b>@babel/runtime</b></summary> <ul> <li> <b>7.28.4</b> - <a href="https://redirect.github.com/babel/babel/releases/tag/v7.28.4">2025-09-05</a></br><h2>v7.28.4 (2025-09-05)</h2> <p>Thanks <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/gwillen/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/gwillen">@ gwillen</a> and <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/mrginglymus/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://redirect.github.com/mrginglymus">@ mrginglymus</a> for your first PRs!</p> <h4>🏠 Internal</h4> <ul> <li><code>babel-core</code>, <code>babel-helper-check-duplicate-nodes</code>, <code>babel-traverse</code>, <code>babel-types</code> <ul> <li><a href="https://redirect.github.com/babel/babel/pull/17493" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/17493/hovercard">#17493</a> Update Jest to v30.1.1 (<a href="https://redirect.github.com/JLHwung">@ JLHwung</a>)</li> </ul> </li> <li><code>babel-plugin-transform-regenerator</code> <ul> <li><a href="https://redirect.github.com/babel/babel/pull/17455" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/17455/hovercard">#17455</a> chore: Clean up <code>transform-regenerator</code> (<a href="https://redirect.github.com/liuxingbaoyu">@ liuxingbaoyu</a>)</li> </ul> </li> <li><code>babel-core</code> <ul> <li><a href="https://redirect.github.com/babel/babel/pull/17474" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/17474/hovercard">#17474</a> Switch to @ jridgewell/remapping (<a href="https://redirect.github.com/mrginglymus">@ mrginglymus</a>)</li> </ul> </li> </ul> <h4>Committers: 5</h4> <ul> <li>Babel Bot (<a href="https://redirect.github.com/babel-bot">@ babel-bot</a>)</li> <li>Bill Collins (<a href="https://redirect.github.com/mrginglymus">@ mrginglymus</a>)</li> <li>Glenn Willen (<a href="https://redirect.github.com/gwillen">@ gwillen</a>)</li> <li>Huáng Jùnliàng (<a href="https://redirect.github.com/JLHwung">@ JLHwung</a>)</li> <li><a href="https://redirect.github.com/liuxingbaoyu">@ liuxingbaoyu</a></li> </ul> </li> <li> <b>7.28.3</b> - <a href="https://redirect.github.com/babel/babel/releases/tag/v7.28.3">2025-08-14</a></br><h2>v7.28.3 (2025-08-14)</h2> <h4>👓 Spec Compliance</h4> <ul> <li><code>babel-helper-create-class-features-plugin</code>, <code>babel-plugin-proposal-decorators</code>, <code>babel-plugin-transform-class-static-block</code>, <code>babel-preset-env</code> <ul> <li><a href="https://redirect.github.com/babel/babel/pull/17443" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/17443/hovercard">#17443</a> [static blocks] Do not inject new static fields after static code (<a href="https://redirect.github.com/nicolo-ribaudo">@ nicolo-ribaudo</a>)</li> </ul> </li> </ul> <h4>🐛 Bug Fix</h4> <ul> <li><code>babel-parser</code> <ul> <li><a href="https://redirect.github.com/babel/babel/pull/17465" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/17465/hovercard">#17465</a> fix(parser/typescript): parse <code>import("./a", {with:{},})</code> (<a href="https://redirect.github.com/easrng">@ easrng</a>)</li> <li><a href="https://redirect.github.com/babel/babel/pull/17478" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/17478/hovercard">#17478</a> fix(parser): stop subscript parsing on async arrow (<a href="https://redirect.github.com/JLHwung">@ JLHwung</a>)</li> </ul> </li> </ul> <h4>💅 Polish</h4> <ul> <li><code>babel-plugin-transform-regenerator</code>, <code>babel-plugin-transform-runtime</code> <ul> <li><a href="https://redirect.github.com/babel/babel/pull/17363" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/17363/hovercard">#17363</a> Do not save last yield in call in temp var (<a href="https://redirect.github.com/nicolo-ribaudo">@ nicolo-ribaudo</a>)</li> </ul> </li> </ul> <h4>📝 Documentation</h4> <ul> <li><a href="https://redirect.github.com/babel/babel/pull/17448" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/17448/hovercard">#17448</a> move eslint-{parser,plugin} docs to the website (<a href="https://redirect.github.com/JLHwung">@ JLHwung</a>)</li> </ul> <h4>🏠 Internal</h4> <ul> <li><a href="https://redirect.github.com/babel/babel/pull/17454" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/17454/hovercard">#17454</a> Enable type checking for <code>scripts</code> and <code>babel-worker.cjs</code> (<a href="https://redirect.github.com/JLHwung">@ JLHwung</a>)</li> </ul> <h4>🔬 Output optimization</h4> <ul> <li><code>babel-plugin-proposal-destructuring-private</code>, <code>babel-plugin-proposal-do-expressions</code> <ul> <li><a href="https://redirect.github.com/babel/babel/pull/17444" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/17444/hovercard">#17444</a> Optimize do expression output (<a href="https://redirect.github.com/JLHwung">@ JLHwung</a>)</li> </ul> </li> </ul> <h4>Committers: 5</h4> <ul> <li>Babel Bot (<a href="https://redirect.github.com/babel-bot">@ babel-bot</a>)</li> <li>Huáng Jùnliàng (<a href="https://redirect.github.com/JLHwung">@ JLHwung</a>)</li> <li>Jam Balaya (<a href="https://redirect.github.com/JamBalaya56562">@ JamBalaya56562</a>)</li> <li>Nicolò Ribaudo (<a href="https://redirect.github.com/nicolo-ribaudo">@ nicolo-ribaudo</a>)</li> <li>easrng (<a href="https://redirect.github.com/easrng">@ easrng</a>)</li> </ul> </li> </ul> from <a href="https://redirect.github.com/babel/babel/releases">@babel/runtime GitHub release notes</a> </details> </details> --- > [!IMPORTANT] > > - 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Fixes #1, Fixes #2In this PR we scan for the control flow statements within a do block and use the previous transform approach when there is no break/continue/return. The current approach has to memoize every top level statements to ensure that the block can be unwrapped, when there is no control flow statements, this approach unnecessarily bloated the output.
We also added new tests for the coverage of the transform that supports early exits. A few unreachable codes have been removed.
This PR happens to fixes #17439, to the extent of when early exits do not present in the do block.