Improve source map generation #14967

liuxingbaoyu · 2022-09-22T17:10:19Z

Q	A
Fixed Issues?	Fixes https://twitter.com/kdy1dev/status/1572480517634924544
Patch: Bug Fix?	√
Major: Breaking Change?	?
Minor: New Feature?
Tests Added + Pass?	√
Documentation PR Link
Any Dependency Changes?
License	MIT

Please follow the commit one by one to review.

I'm not sure I fully understand the old code, but from the results, the improvement is obvious.
before
after

There are still some issues, input-source-map-multiple-output-sources-complete-replace and several other source map merge test exceptions.
I don't understand why this is and I'd be grateful if anyone could provide guidance!

babel-bot · 2022-09-22T17:13:13Z

Build successful! You can test your changes in the REPL here: https://babeljs.io/repl/build/53052/

jridgewell · 2022-09-22T17:24:48Z

packages/babel-generator/src/buffer.ts

-      this._sourcePosition.filename = originalFilename;
-      this._sourcePosition.identifierName = originalIdentifierName;
-      this._disallowedPop.objectReusable = true;
+    sourcePosition.identifierName =


Can this be unified with _normalizePosition? Seems like we just need to add lineOffset and columnOffset params.

jridgewell · 2022-09-22T17:35:25Z

packages/babel-generator/src/generators/base.ts

    this.removeTrailingNewline();

-    this.source("end", node.loc);
+    this.sourceWithOffset("end", node.loc, 0, -1);


This is to mark the close of the block, but we may add a newline directly below, which'll screw up the marking. I think we need to do this right before the rightBrace() call.

I think we could even extract this out of the if/else, and perform this after printing the brace?

jridgewell · 2022-09-22T18:11:07Z

...abel-core/test/fixtures/transformation/source-maps/input-source-map-external/source-map.json

 {
-  "mappings": "AAAA,UAAU,Y;SAAM;AAAC,CAAjB",
+  "version": 3,
+  "mappings": "AAAA,UAAU,Y;SAAM,C;CAAC",


This change is fine. The ; is no longer mapped to a source location, which really don't matter.

jridgewell · 2022-09-22T18:15:40Z

...mation/source-maps/input-source-map-multiple-output-sources-complete-replace/source-map.json

 {
  "version": 3,
-  "mappings": "AAAC,KCAD;ACAA,K",
+  "mappings": "AAAC,KAAG;ACAJ,KAAG",


This change is fine. The ; is mapped to the bar.js file (which fully replaces the input.tsx in the plugin) instead of the input.tsx file. Because nothing refers to the input.tsx file, it's removed from sourcesContent.

jridgewell · 2022-09-22T18:17:11Z

...fixtures/transformation/source-maps/input-source-map-multiple-output-sources/source-map.json

 {
  "version": 3,
-  "mappings": "AAAC,KCAD;;AACA,SAASA,GAAT,CAAaC,GAAb,EAAwB;EACpB,MAAM,IAAIC,KAAJ,CAAU,cAAV,CAAN;AACH",
+  "mappings": "AAAC,KAAG;;ACCJ,SAASA,GAAG,CAACC,GAAW;EACpB,MAAM,IAAIC,KAAK,CAAC,cAAc,CAAC;AACnC",


Changes are fine. Same reasoning with the ; pointing to the same file as the expression.

jridgewell · 2022-09-22T18:17:51Z

...core/test/fixtures/transformation/source-maps/input-source-map-same-location/source-map.json

 {
-  "mappings": "AAAA,UAAU,Y;SAAM;AAAC,CAAjB",
+  "version": 3,
+  "mappings": "AAAA,UAAU,Y;SAAM,C;CAAC",


Same ; change.

jridgewell · 2022-09-22T18:18:05Z

...ixtures/transformation/source-maps/input-source-map-sources-complete-replace/source-map.json

 {
  "version": 3,
-  "mappings": "AAAC,KCAD",
+  "mappings": "AAAC,KAAG",


Same ; change.

jridgewell · 2022-09-22T18:18:19Z

packages/babel-core/test/fixtures/transformation/source-maps/input-source-map/source-map.json

 {
-  "mappings": "AAAA,UAAU,Y;SAAM;AAAC,CAAjB",
+  "version": 3,
+  "mappings": "AAAA,UAAU,Y;SAAM,C;CAAC",


Same ; change.

jridgewell · 2022-09-22T18:19:33Z

...l-core/test/fixtures/transformation/source-maps/interpreter-directive-prefix/source-map.json

  ],
-  "version": 3
-}
+  "mappings": "AAAA;AAEAA,OAAO,CAACC,GAAG,CAAC,eAAe,CAAC"


The better maps the ( and ), and includes the same ; change.

liuxingbaoyu · 2022-09-22T18:37:09Z

Wow! Amazing review, this is extremely helpful! thank you!

jridgewell · 2022-09-22T19:20:45Z

packages/babel-generator/src/generators/base.ts


-    this.sourceWithOffset("end", node.loc, 0, -1);
-
    if (!this.endsWith(charCodes.lineFeed)) this.newline();


Can you add a test case for this? This should work as an input.

packages/babel-generator/test/fixtures/sourcemaps/arrow-function-compact/options.json

nicolo-ribaudo · 2022-09-24T11:12:27Z

@jridgewell What tools do you use to review these changes?

jridgewell · 2022-09-26T15:42:33Z

The same https://evanw.github.io/source-map-visualization/ from OP to see visually. I also read the source map to see the segment changes (you might use https://github.com/jridgewell/sourcemap-codec to decode them if you're not familiar with VLQ)

JLHwung

For reviewers: the before / after links provided by OP is visualization of a sourcemap generated by running Babel without any transform. In this case, an ideal sourcemap will mirror every token from input to output.

Take this snippet as an example:

export function enable() {}

Before this PR, Babel maps function to function() and enable( to enable. This PR adds more sourcemap segments so that function, enable, ( and ) all correctly map to the output (theirselves respectively).

@liuxingbaoyu Great job! It would be sweet if you can convey such info in the PR description.

JLHwung · 2022-09-26T20:54:59Z

packages/babel-generator/src/generators/types.ts

    this.space();
  }

+  this.sourceWithOffset("end", node.loc, 0, -1);


Can you check if we need the same fix for record expression?

babel/packages/babel-generator/src/generators/types.ts

Line 142 in 6be6e04

this.token(endToken);

JLHwung · 2022-09-26T21:06:11Z

packages/babel-generator/src/generators/base.ts

  }
+
+  this.sourceWithOffset("end", node.loc, 0, -1);
+  this.rightBrace();


Can you also check if we need the same fix for ClassBody, StaticBlock and ModuleExpression?

liuxingbaoyu · 2022-09-27T06:45:55Z

Oh, you found additional improvements!
Actually at first I was mainly to fix the problem mentioned in https://twitter.com/robpalmer2/status/1572487542108463105.
Anyway, ,, ), } pointing to the wrong location is not good, and tsc is not like that.

Later during the fix I found out that this seems to be intentional, maybe to reduce the size of the source map or fix a bug or something, I'm not sure, but I think it shouldn't be necessary for now.
#3183
#3463

To be honest, I don't know what the expectations were when sourcemap was designed, and I even learned that tenser will output something like func(, but since we have expressed it as func, ( in the generated code , then there should be no problem matching them up.

ehoogeveen-medweb · 2022-09-27T07:40:13Z

To be honest, I don't know what the expectations were when sourcemap was designed, and I even learned that tenser will output something like func(, but since we have expressed it as func, ( in the generated code , then there should be no problem matching them up.

I'm a bit confused by your example: Since the keyword function exists in both the input and the output, shouldn't function map to function instead of the ( here?

liuxingbaoyu · 2022-09-27T07:43:03Z

To be honest, I don't know what the expectations were when sourcemap was designed, and I even learned that tenser will output something like func(, but since we have expressed it as func, ( in the generated code , then there should be no problem matching them up.

I'm a bit confused by your example: Since the keyword function exists in both the input and the output, shouldn't function map to function instead of the ( here?

Are you referring to the content of the screenshot? That was the previous behavior (function was normal, but ( was also mapped to function), now it looks like this.

nicolo-ribaudo · 2022-09-27T10:03:09Z

@robpalme fyi 🙂

JLHwung · 2022-09-27T13:57:10Z

packages/babel-generator/test/index.js

              const result = run();

-              if (options.sourceMaps) {
+              if (options.sourceMaps || options.sourceMap) {


Nit: the sourceMap option is synonym of sourceMaps. Since we recommend sourceMaps option in the doc, can you replace the test options using sourceMap?

For some reason another place goes wrong when I use sourceMaps, so I've left it out for the sake of convenience, but since you mentioned this, I'll look at it later

nicolo-ribaudo

Good job!

nicolo-ribaudo · 2022-09-27T18:17:35Z

...babel-generator/test/fixtures/decorators-legacy/ts-class-modifier-with-retainlines/output.js

  private [cm]()

-  {}}
+  {}


I also thought it was a throwback when I first saw it, but on closer inspection it wasn't.😃

nicolo-ribaudo · 2022-09-27T20:24:07Z

The CI failure is ok; Jest will have to update it after we release this PR.

nicolo-ribaudo · 2022-09-29T12:45:10Z

Have all the comments of #14967 (review) been resolved?

liuxingbaoyu · 2022-09-29T15:24:01Z

Seems yes, but please wait a minute, I found a possibly simple performance optimization, let me try it out.

liuxingbaoyu · 2022-09-29T16:11:28Z

packages/babel-generator/src/buffer.ts


-  /**
-   * Allow printers to disable the default location-reset behavior of the
-   * sourcemap output, so that certain printers can be sure that the
-   * "end" location that they set is actually treated as the end position.
-   */
-  _disallowPop(prop: "start" | "end", loc: Loc) {
-    if (!loc) return;
-
-    const disallowedPop = this._disallowedPop;
-
-    this._normalizePosition(prop, loc, disallowedPop);
-
-    disallowedPop.objectReusable = false;
-  }
-
-  _normalizePosition(prop: "start" | "end", loc: Loc, targetObj: SourcePos) {
+  _normalizePosition(
+    prop: "start" | "end",
+    loc: Loc,
+    lineOffset: number,
+    columnOffset: number,
+  ) {
    const pos = loc[prop];
+    const target = this._sourcePosition;

-    targetObj.identifierName =
+    target.identifierName =
      (prop === "start" && loc.identifierName) || undefined;
    if (pos) {
-      targetObj.line = pos.line;
-      targetObj.column = pos.column;
-      targetObj.filename = loc.filename;
-    } else {
-      targetObj.line = null;
-      targetObj.column = null;
-      targetObj.filename = null;
+      target.line = pos.line + lineOffset;
+      target.column = pos.column + columnOffset;
+      target.filename = loc.filename;
    }
  }


It will only be set to null if loc!=null && loc[prop]==null, which seems unnecessary.

nicolo-ribaudo · 2022-09-29T21:02:50Z

Bye bye ✔️ on main

nicolo-ribaudo · 2022-09-29T21:03:24Z

Maybe this should be Polish?

SimenB · 2022-10-03T09:21:43Z

Bye bye ✔️ on main

Feel free to ping me when you make a release 🙂

nicolo-ribaudo · 2022-10-03T09:52:27Z

Yes! I'm waiting to merge another PR that causes changes in the same files, then I'll release :)

<h3>Snyk has created this PR to upgrade multiple dependencies.</h3> 👯‍♂ The following dependencies are linked and will therefore be updated together. </br></br> :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. </br></br> Name | Versions | Released on :-------------|:-------------|:------------- **@babel/core**</br>from 7.19.6 to 7.20.2 | **1 version** ahead of your current version | **21 days ago**</br>on 2022-11-04 **@babel/preset-env**</br>from 7.19.4 to 7.20.2 | **1 version** ahead of your current version | **21 days ago**</br>on 2022-11-04 <details> <summary><b>Release notes</b></summary> <br/> <details> <summary>Package name: <b>@babel/core</b></summary> <ul> <li> <b>7.20.2</b> - <a href="https://snyk.io/redirect/github/babel/babel/releases/tag/v7.20.2">2022-11-04</a></br><h2>v7.20.2 (2022-11-04)</h2> <h4><g-emoji class="g-emoji" alias="bug" fallback-src="https://github.githubassets.com/images/icons/emoji/unicode/1f41b.png">🐛</g-emoji> Bug Fix</h4> <ul> <li><code>babel-core</code>, <code>babel-helper-create-class-features-plugin</code>, <code>babel-helper-module-transforms</code>, <code>babel-helper-plugin-utils</code>, <code>babel-helper-simple-access</code>, <code>babel-node</code>, <code>babel-plugin-transform-block-scoping</code>, <code>babel-plugin-transform-classes</code>, <code>babel-plugin-transform-react-constant-elements</code>, <code>babel-preset-env</code>, <code>babel-standalone</code>, <code>babel-types</code> <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/15124" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/15124/hovercard">#15124</a> fix: <code>@ babel/node</code> repl and enable <code>no-use-before-define</code> rule (<a href="https://snyk.io/redirect/github/liuxingbaoyu">@ liuxingbaoyu</a>)</li> </ul> </li> <li><code>babel-plugin-transform-typescript</code> <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/15121" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/15121/hovercard">#15121</a> fix: <code>tsSatisfiesExpression</code> check with different duplicated <code>@ babel/types</code> versions (<a href="https://snyk.io/redirect/github/liuxingbaoyu">@ liuxingbaoyu</a>)</li> </ul> </li> <li><code>babel-parser</code> <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/15094" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/15094/hovercard">#15094</a> fix: <code>parser</code> typings for plugins (<a href="https://snyk.io/redirect/github/liuxingbaoyu">@ liuxingbaoyu</a>)</li> </ul> </li> <li><code>babel-generator</code> <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/15118" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/15118/hovercard">#15118</a> Improve printing of [no LineTerminator here] with comments (<a href="https://snyk.io/redirect/github/nicolo-ribaudo">@ nicolo-ribaudo</a>)</li> </ul> </li> <li><code>babel-plugin-proposal-decorators</code>, <code>babel-plugin-proposal-object-rest-spread</code>, <code>babel-plugin-transform-jscript</code> <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/15113" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/15113/hovercard">#15113</a> fix: wrap anonymous class expression within statement (<a href="https://snyk.io/redirect/github/JLHwung">@ JLHwung</a>)</li> </ul> </li> <li><code>babel-plugin-transform-destructuring</code> <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/15104" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/15104/hovercard">#15104</a> fix: Destructuring exceptions <code>for ( let { } = 0 ; 0 ; ) </code> (<a href="https://snyk.io/redirect/github/liuxingbaoyu">@ liuxingbaoyu</a>)</li> </ul> </li> </ul> <h4>Committers: 3</h4> <ul> <li>Huáng Jùnliàng (<a href="https://snyk.io/redirect/github/JLHwung">@ JLHwung</a>)</li> <li>Nicolò Ribaudo (<a href="https://snyk.io/redirect/github/nicolo-ribaudo">@ nicolo-ribaudo</a>)</li> <li><a href="https://snyk.io/redirect/github/liuxingbaoyu">@ liuxingbaoyu</a></li> </ul> </li> <li> <b>7.19.6</b> - <a href="https://snyk.io/redirect/github/babel/babel/releases/tag/v7.19.6">2022-10-20</a></br><h2>v7.19.6 (2022-10-20)</h2> <p>Thanks <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/lomirus/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://snyk.io/redirect/github/lomirus">@ lomirus</a> for your first PR!</p> <h4><g-emoji class="g-emoji" alias="eyeglasses" fallback-src="https://github.githubassets.com/images/icons/emoji/unicode/1f453.png">👓</g-emoji> Spec Compliance</h4> <ul> <li><code>babel-plugin-proposal-decorators</code> <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/15059" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/15059/hovercard">#15059</a> Ensure non-static decorators are applied when a class is instantiated. (<a href="https://snyk.io/redirect/github/JLHwung">@ JLHwung</a>)</li> </ul> </li> </ul> <h4><g-emoji class="g-emoji" alias="bug" fallback-src="https://github.githubassets.com/images/icons/emoji/unicode/1f41b.png">🐛</g-emoji> Bug Fix</h4> <ul> <li><code>babel-parser</code> <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/15062" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/15062/hovercard">#15062</a> Fix parsing of block comments nested in flow comments (<a href="https://snyk.io/redirect/github/nicolo-ribaudo">@ nicolo-ribaudo</a>)</li> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/15052" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/15052/hovercard">#15052</a> fix: improve module block program location tracking (<a href="https://snyk.io/redirect/github/JLHwung">@ JLHwung</a>)</li> </ul> </li> <li><code>babel-plugin-transform-runtime</code>, <code>babel-runtime-corejs2</code>, <code>babel-runtime-corejs3</code> <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/15060" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/15060/hovercard">#15060</a> Ensure <code>@ babel/runtime-corejs3/core-js/*.js</code> can be imported on Node.js 17+ (<a href="https://snyk.io/redirect/github/JLHwung">@ JLHwung</a>)</li> </ul> </li> <li><code>babel-preset-env</code>, <code>babel-traverse</code> <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/15043" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/15043/hovercard">#15043</a> fix: preserve this for <code>super.*</code> template tags (<a href="https://snyk.io/redirect/github/liuxingbaoyu">@ liuxingbaoyu</a>)</li> </ul> </li> </ul> <h4><g-emoji class="g-emoji" alias="nail_care" fallback-src="https://github.githubassets.com/images/icons/emoji/unicode/1f485.png">💅</g-emoji> Polish</h4> <ul> <li><code>babel-generator</code>, <code>babel-plugin-transform-flow-comments</code> <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/15037" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/15037/hovercard">#15037</a> Improve generation of comments without location (<a href="https://snyk.io/redirect/github/liuxingbaoyu">@ liuxingbaoyu</a>)</li> </ul> </li> </ul> <h4><g-emoji class="g-emoji" alias="memo" fallback-src="https://github.githubassets.com/images/icons/emoji/unicode/1f4dd.png">📝</g-emoji> Documentation</h4> <ul> <li><code>babel-standalone</code> <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/15055" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/15055/hovercard">#15055</a> Fix missing <code>transformSync</code> function name (<a href="https://snyk.io/redirect/github/lomirus">@ lomirus</a>)</li> </ul> </li> </ul> <h4><g-emoji class="g-emoji" alias="house" fallback-src="https://github.githubassets.com/images/icons/emoji/unicode/1f3e0.png">🏠</g-emoji> Internal</h4> <ul> <li><code>babel-parser</code> <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/15056" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/15056/hovercard">#15056</a> Use <code>startLoc.index</code> instead of carrying around <code>start</code> (<a href="https://snyk.io/redirect/github/nicolo-ribaudo">@ nicolo-ribaudo</a>)</li> </ul> </li> <li>Other <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/15035" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/15035/hovercard">#15035</a> chore: Update yarn 3.2.4 (<a href="https://snyk.io/redirect/github/liuxingbaoyu">@ liuxingbaoyu</a>)</li> </ul> </li> </ul> <h4><g-emoji class="g-emoji" alias="running_woman" fallback-src="https://github.githubassets.com/images/icons/emoji/unicode/1f3c3-2640.png">🏃‍♀️</g-emoji> Performance</h4> <ul> <li><code>babel-core</code>, <code>babel-standalone</code> <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/15023" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/15023/hovercard">#15023</a> Don't bundle unnecessary plugins in <code>@ babel/standalone</code> (<a href="https://snyk.io/redirect/github/nicolo-ribaudo">@ nicolo-ribaudo</a>)</li> </ul> </li> </ul> <h4>Committers: 4</h4> <ul> <li>Huáng Jùnliàng (<a href="https://snyk.io/redirect/github/JLHwung">@ JLHwung</a>)</li> <li>Lomírus (<a href="https://snyk.io/redirect/github/lomirus">@ lomirus</a>)</li> <li>Nicolò Ribaudo (<a href="https://snyk.io/redirect/github/nicolo-ribaudo">@ nicolo-ribaudo</a>)</li> <li><a href="https://snyk.io/redirect/github/liuxingbaoyu">@ liuxingbaoyu</a></li> </ul> </li> </ul> from <a href="https://snyk.io/redirect/github/babel/babel/releases">@babel/core GitHub release notes</a> </details> <details> <summary>Package name: <b>@babel/preset-env</b></summary> <ul> <li> <b>7.20.2</b> - <a href="https://snyk.io/redirect/github/babel/babel/releases/tag/v7.20.2">2022-11-04</a></br><h2>v7.20.2 (2022-11-04)</h2> <h4><g-emoji class="g-emoji" alias="bug" fallback-src="https://github.githubassets.com/images/icons/emoji/unicode/1f41b.png">🐛</g-emoji> Bug Fix</h4> <ul> <li><code>babel-core</code>, <code>babel-helper-create-class-features-plugin</code>, <code>babel-helper-module-transforms</code>, <code>babel-helper-plugin-utils</code>, <code>babel-helper-simple-access</code>, <code>babel-node</code>, <code>babel-plugin-transform-block-scoping</code>, <code>babel-plugin-transform-classes</code>, <code>babel-plugin-transform-react-constant-elements</code>, <code>babel-preset-env</code>, <code>babel-standalone</code>, <code>babel-types</code> <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/15124" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/15124/hovercard">#15124</a> fix: <code>@ babel/node</code> repl and enable <code>no-use-before-define</code> rule (<a href="https://snyk.io/redirect/github/liuxingbaoyu">@ liuxingbaoyu</a>)</li> </ul> </li> <li><code>babel-plugin-transform-typescript</code> <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/15121" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/15121/hovercard">#15121</a> fix: <code>tsSatisfiesExpression</code> check with different duplicated <code>@ babel/types</code> versions (<a href="https://snyk.io/redirect/github/liuxingbaoyu">@ liuxingbaoyu</a>)</li> </ul> </li> <li><code>babel-parser</code> <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/15094" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/15094/hovercard">#15094</a> fix: <code>parser</code> typings for plugins (<a href="https://snyk.io/redirect/github/liuxingbaoyu">@ liuxingbaoyu</a>)</li> </ul> </li> <li><code>babel-generator</code> <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/15118" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/15118/hovercard">#15118</a> Improve printing of [no LineTerminator here] with comments (<a href="https://snyk.io/redirect/github/nicolo-ribaudo">@ nicolo-ribaudo</a>)</li> </ul> </li> <li><code>babel-plugin-proposal-decorators</code>, <code>babel-plugin-proposal-object-rest-spread</code>, <code>babel-plugin-transform-jscript</code> <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/15113" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/15113/hovercard">#15113</a> fix: wrap anonymous class expression within statement (<a href="https://snyk.io/redirect/github/JLHwung">@ JLHwung</a>)</li> </ul> </li> <li><code>babel-plugin-transform-destructuring</code> <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/15104" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/15104/hovercard">#15104</a> fix: Destructuring exceptions <code>for ( let { } = 0 ; 0 ; ) </code> (<a href="https://snyk.io/redirect/github/liuxingbaoyu">@ liuxingbaoyu</a>)</li> </ul> </li> </ul> <h4>Committers: 3</h4> <ul> <li>Huáng Jùnliàng (<a href="https://snyk.io/redirect/github/JLHwung">@ JLHwung</a>)</li> <li>Nicolò Ribaudo (<a href="https://snyk.io/redirect/github/nicolo-ribaudo">@ nicolo-ribaudo</a>)</li> <li><a href="https://snyk.io/redirect/github/liuxingbaoyu">@ liuxingbaoyu</a></li> </ul> </li> <li> <b>7.19.4</b> - <a href="https://snyk.io/redirect/github/babel/babel/releases/tag/v7.19.4">2022-10-10</a></br><h2>v7.19.4 (2022-10-10)</h2> <h4><g-emoji class="g-emoji" alias="eyeglasses" fallback-src="https://github.githubassets.com/images/icons/emoji/unicode/1f453.png">👓</g-emoji> Spec Compliance</h4> <ul> <li><code>babel-plugin-transform-block-scoping</code> <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/15019" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/15019/hovercard">#15019</a> fix: check constant violation inside loops (<a href="https://snyk.io/redirect/github/nicolo-ribaudo">@ nicolo-ribaudo</a>)</li> </ul> </li> <li><code>babel-helpers</code>, <code>babel-plugin-proposal-destructuring-private</code>, <code>babel-plugin-proposal-object-rest-spread</code>, <code>babel-plugin-transform-destructuring</code> <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/14985" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/14985/hovercard">#14985</a> Disallow rest object destructuring of null/undefined (<a href="https://snyk.io/redirect/github/nicolo-ribaudo">@ nicolo-ribaudo</a>)</li> </ul> </li> </ul> <h4><g-emoji class="g-emoji" alias="bug" fallback-src="https://github.githubassets.com/images/icons/emoji/unicode/1f41b.png">🐛</g-emoji> Bug Fix</h4> <ul> <li><code>babel-plugin-transform-react-jsx-development</code>, <code>babel-plugin-transform-typescript</code>, <code>babel-types</code> <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/14109" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/14109/hovercard">#14109</a> Fix: properly scope variables in TSModuleBlock (<a href="https://snyk.io/redirect/github/The-x-Theorist">@ The-x-Theorist</a>)</li> </ul> </li> <li><code>babel-plugin-transform-destructuring</code>, <code>babel-plugin-transform-react-constant-elements</code>, <code>babel-traverse</code> <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/15027" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/15027/hovercard">#15027</a> fix: mark <code>var</code> declarations in loops as not constant (<a href="https://snyk.io/redirect/github/nicolo-ribaudo">@ nicolo-ribaudo</a>)</li> </ul> </li> <li><code>babel-helper-string-parser</code>, <code>babel-parser</code>, <code>babel-types</code> <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/14964" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/14964/hovercard">#14964</a> Never throw for invalid escapes in tagged templates (<a href="https://snyk.io/redirect/github/nicolo-ribaudo">@ nicolo-ribaudo</a>)</li> </ul> </li> <li><code>babel-generator</code>, <code>babel-parser</code> <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/14980" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/14980/hovercard">#14980</a> Improve module expression parsing/printing (<a href="https://snyk.io/redirect/github/JLHwung">@ JLHwung</a>)</li> </ul> </li> <li><code>babel-plugin-transform-destructuring</code> <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/14984" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/14984/hovercard">#14984</a> Fix holes handling in optimized array destructuring (<a href="https://snyk.io/redirect/github/nicolo-ribaudo">@ nicolo-ribaudo</a>)</li> </ul> </li> </ul> <h4><g-emoji class="g-emoji" alias="nail_care" fallback-src="https://github.githubassets.com/images/icons/emoji/unicode/1f485.png">💅</g-emoji> Polish</h4> <ul> <li><code>babel-cli</code>, <code>babel-core</code>, <code>babel-generator</code>, <code>babel-helper-create-class-features-plugin</code>, <code>babel-helper-fixtures</code>, <code>babel-helper-simple-access</code>, <code>babel-helper-transform-fixture-test-runner</code>, <code>babel-helpers</code>, <code>babel-plugin-bugfix-safari-id-destructuring-collision-in-function-expression</code>, <code>babel-plugin-bugfix-v8-spread-parameters-in-optional-chaining</code>, <code>babel-plugin-external-helpers</code>, <code>babel-plugin-proposal-async-do-expressions</code>, <code>babel-plugin-proposal-async-generator-functions</code>, <code>babel-plugin-proposal-class-properties</code>, <code>babel-plugin-proposal-class-static-block</code>, <code>babel-plugin-proposal-decorators</code>, <code>babel-plugin-proposal-destructuring-private</code>, <code>babel-plugin-proposal-do-expressions</code>, <code>babel-plugin-proposal-duplicate-named-capturing-groups-regex</code>, <code>babel-plugin-proposal-dynamic-import</code>, <code>babel-plugin-proposal-function-bind</code>, <code>babel-plugin-proposal-function-sent</code>, <code>babel-plugin-proposal-json-strings</code>, <code>babel-plugin-proposal-logical-assignment-operators</code>, <code>babel-plugin-proposal-nullish-coalescing-operator</code>, <code>babel-plugin-proposal-object-rest-spread</code>, <code>babel-plugin-proposal-optional-chaining</code>, <code>babel-plugin-proposal-partial-application</code>, <code>babel-plugin-proposal-pipeline-operator</code>, <code>babel-plugin-proposal-private-methods</code>, <code>babel-plugin-proposal-private-property-in-object</code>, <code>babel-plugin-proposal-record-and-tuple</code>, <code>babel-plugin-syntax-typescript</code>, <code>babel-plugin-transform-arrow-functions</code>, <code>babel-plugin-transform-async-to-generator</code>, <code>babel-plugin-transform-block-scoping</code>, <code>babel-plugin-transform-classes</code>, <code>babel-plugin-transform-computed-properties</code>, <code>babel-plugin-transform-destructuring</code>, <code>babel-plugin-transform-duplicate-keys</code>, <code>babel-plugin-transform-exponentiation-operator</code>, <code>babel-plugin-transform-flow-comments</code>, <code>babel-plugin-transform-flow-strip-types</code>, <code>babel-plugin-transform-for-of</code>, <code>babel-plugin-transform-function-name</code>, <code>babel-plugin-transform-jscript</code>, <code>babel-plugin-transform-modules-amd</code>, <code>babel-plugin-transform-modules-commonjs</code>, <code>babel-plugin-transform-modules-systemjs</code>, <code>babel-plugin-transform-modules-umd</code>, <code>babel-plugin-transform-new-target</code>, <code>babel-plugin-transform-object-super</code>, <code>babel-plugin-transform-parameters</code>, <code>babel-plugin-transform-proto-to-assign</code>, <code>babel-plugin-transform-react-constant-elements</code>, <code>babel-plugin-transform-react-inline-elements</code>, <code>babel-plugin-transform-react-jsx-development</code>, <code>babel-plugin-transform-react-jsx-self</code>, <code>babel-plugin-transform-react-jsx</code>, <code>babel-plugin-transform-react-pure-annotations</code>, <code>babel-plugin-transform-regenerator</code>, <code>babel-plugin-transform-runtime</code>, <code>babel-plugin-transform-shorthand-properties</code>, <code>babel-plugin-transform-spread</code>, <code>babel-plugin-transform-strict-mode</code>, <code>babel-plugin-transform-template-literals</code>, <code>babel-plugin-transform-typeof-symbol</code>, <code>babel-plugin-transform-typescript</code>, <code>babel-plugin-transform-unicode-escapes</code>, <code>babel-preset-env</code>, <code>babel-preset-react</code>, <code>babel-preset-typescript</code>, <code>babel-runtime-corejs2</code>, <code>babel-runtime-corejs3</code>, <code>babel-runtime</code>, <code>babel-traverse</code> <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/14979" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/14979/hovercard">#14979</a> Improve comments generation (<a href="https://snyk.io/redirect/github/liuxingbaoyu">@ liuxingbaoyu</a>)</li> </ul> </li> <li><code>babel-cli</code>, <code>babel-core</code>, <code>babel-generator</code>, <code>babel-helper-fixtures</code>, <code>babel-helper-transform-fixture-test-runner</code>, <code>babel-plugin-transform-destructuring</code>, <code>babel-plugin-transform-modules-commonjs</code>, <code>babel-traverse</code> <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/14967" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/14967/hovercard">#14967</a> Improve source map generation (<a href="https://snyk.io/redirect/github/liuxingbaoyu">@ liuxingbaoyu</a>)</li> </ul> </li> </ul> <h4><g-emoji class="g-emoji" alias="house" fallback-src="https://github.githubassets.com/images/icons/emoji/unicode/1f3e0.png">🏠</g-emoji> Internal</h4> <ul> <li>Other <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/15001" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/15001/hovercard">#15001</a> Run test262 again (<a href="https://snyk.io/redirect/github/nicolo-ribaudo">@ nicolo-ribaudo</a>)</li> </ul> </li> <li><code>babel-compat-data</code>, <code>babel-preset-env</code> <ul> <li><a href="https://snyk.io/redirect/github/babel/babel/pull/14976" data-hovercard-type="pull_request" data-hovercard-url="/babel/babel/pull/14976/hovercard">#14976</a> Internally rename <code>proposal-*</code> to <code>transform-*</code> in preset-env (<a href="https://snyk.io/redirect/github/nicolo-ribaudo">@ nicolo-ribaudo</a>)</li> </ul> </li> </ul> <h4>Committers: 5</h4> <ul> <li>Babel Bot (<a href="https://snyk.io/redirect/github/babel-bot">@ babel-bot</a>)</li> <li>Huáng Jùnliàng (<a href="https://snyk.io/redirect/github/JLHwung">@ JLHwung</a>)</li> <li>Nicolò Ribaudo (<a href="https://snyk.io/redirect/github/nicolo-ribaudo">@ nicolo-ribaudo</a>)</li> <li>Sneh Khatri (<a href="https://snyk.io/redirect/github/The-x-Theorist">@ The-x-Theorist</a>)</li> <li><a href="https://snyk.io/redirect/github/liuxingbaoyu">@ liuxingbaoyu</a></li> </ul> </li> </ul> from <a href="https://snyk.io/redirect/github/babel/babel/releases">@babel/preset-env GitHub 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jridgewell approved these changes Sep 22, 2022

View reviewed changes

liuxingbaoyu added 4 commits September 23, 2022 02:33

source

aeab923

tests

4c4ac39

review

a3038b7

rebase and tests

d90f6ec

liuxingbaoyu force-pushed the improve-sourcemap branch from 3b24750 to d90f6ec Compare September 22, 2022 18:37

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packages/babel-generator/test/fixtures/sourcemaps/arrow-function-compact/options.json Show resolved Hide resolved

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JLHwung added PR: Polish 💅 A type of pull request used for our changelog categories area: sourcemaps labels Sep 26, 2022

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liuxingbaoyu added 2 commits September 27, 2022 19:32

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Improve comments generation #14979

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nicolo-ribaudo changed the title ~~fix: Improve source map generation~~ Improve source map generation Sep 29, 2022

nicolo-ribaudo merged commit 4f4b450 into babel:main Sep 29, 2022

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Invalid sourcemaps even without any AST changes #12312

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shaneomatz mentioned this pull request Nov 18, 2022

[Snyk] Upgrade @babel/runtime from 7.12.5 to 7.20.0 shaneomatz/video.js#1

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		this.sourceWithOffset("end", node.loc, 0, -1);

		if (!this.endsWith(charCodes.lineFeed)) this.newline();

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Improve source map generation #14967

Improve source map generation #14967

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liuxingbaoyu commented Sep 22, 2022 •

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