refactor(parser): remove refNeedsArrowPos #13419

tony-go · 2021-06-03T16:33:58Z

Q
Fixed Issues?	⛔
Patch: Bug Fix?	⛔
Major: Breaking Change?	⛔
Minor: New Feature?	⛔
Tests Added + Pass?	👍
Documentation PR Link	⛔
Any Dependency Changes?	⛔
License	MIT

Hey @JLHwung 👋

Following your comment on my previous PR, I open this draft PR. Let me know If I'm wrong or If I misunderstand something.

🚀

babel-bot · 2021-06-03T16:36:40Z

Build successful! You can test your changes in the REPL here: https://babeljs.io/repl/build/46979/

nicolo-ribaudo · 2021-06-03T17:04:51Z

The CI failure seems to be unrelated.

tony-go · 2021-06-03T17:17:57Z

The CI failure seems to be unrelated.

I received the same message for my previous PR.

JLHwung · 2021-06-03T18:03:21Z

I am wondering if we could remove all the refNeedsArrowPos usage, according to

babel/packages/babel-parser/src/parser/expression.js

Lines 346 to 348 in a0369fd

    
           // FIXME: Disabling this for now since can't seem to get it to play nicely 
        
           // eslint-disable-next-line no-unused-vars 
        
           refNeedsArrowPos?: ?Pos,

it is not engaging with the parser.

The refNeedsArrowPos is changed only in Flow / TypeScript plugin:

babel/packages/babel-parser/src/plugins/flow/index.js

Line 1926 in a0369fd

refNeedsArrowPos.start = result.error.pos || this.state.start;

babel/packages/babel-parser/src/plugins/typescript/index.js

Line 2474 in a0369fd

refNeedsArrowPos.start = result.error.pos || this.state.start;

We could try removing it and see if it breaks any test.

tony-go · 2021-06-04T07:20:19Z

We could try removing it and see if it breaks any test.

Hey 👋 @JLHwung ^^ It breaks a lot of tests (20 at least) and as you predicted it's on flow an typescript tests.

For example in this code:

babel/packages/babel-parser/src/plugins/flow/index.js

Line 1926 in a0369fd

refNeedsArrowPos.start = result.error.pos || this.state.start;

Maybe could we pass a boolean instead of refNeedsArrowPos as it's only use to match a branch and .start is reset with result.error.pos || this.state.start.

WDYT ?

tony-go · 2021-06-07T09:34:44Z

Ping @JLHwung ^^

JLHwung · 2021-06-08T12:34:13Z

@tony-go refNeedsArrowPos.start is a number, Babel parser throws when it is not zero. So I guess boolean does not work here.

It seems to me refNeedsArrowPos is set in flow/typescript plugin only. Maybe we can move

babel/packages/babel-parser/src/parser/expression.js

Line 1537 in 56db172

if (refNeedsArrowPos.start) this.unexpected(refNeedsArrowPos.start);

to these plugins so when parsing plain JavaScript we don't care refNeedsArrowPos.

tony-go · 2021-06-09T10:23:26Z

Hi 👋 @JLHwung

Regarding the issue #13419 I pushed a test branch (which contains the move of if (refNeedsArrowPos.start) this.unexpected(refNeedsArrowPos.start); in the flow/ts files.)

Where I’m trying to figured out why test fails :/

Even with the callstack debugger I didn’t understand why en expression like const f = (x?) => {} throw there. (modifié)

tony-go · 2021-06-11T06:32:36Z

Update: I continue to dig with the help of @JLHwung ^^

We merge few things but it still remains two tests which fails. I'm actively working on it ^^

Sorry for the wait.

codesandbox-ci · 2021-06-11T14:43:33Z

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tony-go · 2021-06-11T15:37:11Z

Let me fix linter :/

packages/babel-parser/src/parser/expression.js

JLHwung · 2021-06-11T15:53:34Z

packages/babel-parser/src/parser/expression.js

-        this.parseExprListItem(
-          false,
-          refExpressionErrors,
-          { start: 0 },


Q: refNeedsArrowPos is reset here. Do we need to reset refExpressionErrors.optionalParameters to -1? Maybe worth a test covering this.

packages/babel-parser/src/parser/expression.js

packages/babel-parser/src/plugins/flow/index.js

packages/babel-parser/src/parser/util.js

nicolo-ribaudo

I like how there are more deleted lines than added lines 😄

packages/babel-parser/src/parser/expression.js

packages/babel-parser/src/parser/util.js

tony-go · 2021-06-11T20:20:09Z

Did all corrections.

Just left this [comment](#13419 (comment):

Q: refNeedsArrowPos is reset here. Do we need to reset refExpressionErrors.optionalParameters to -1? Maybe worth a test covering this.

As I did found the test relevant test case for now :/

JLHwung

The PR generally looks good to me! Left some nit comments on extra checking.

packages/babel-parser/src/parser/expression.js

packages/babel-parser/src/plugins/flow/index.js

packages/babel-parser/src/parser/expression.js

packages/babel-parser/src/parser/util.js

packages/babel-parser/src/parser/expression.js

JLHwung

Thanks!

tony-go · 2021-06-18T20:46:05Z

Thanks!

Thanks you for you time. You (and @nicolo-ribaudo) provide me an excellent OSS experience ^^

packages/babel-parser/src/parser/util.js

nicolo-ribaudo

I'm surprised that we need these changed in code that looks unrelated 🤔

packages/babel-parser/src/plugins/flow/index.js

packages/babel-parser/src/plugins/typescript/index.js

nicolo-ribaudo

🎉

fix(parser:expression): remove refNeedsArrowPos in parseExprListItem

9bb8274

nicolo-ribaudo added the pkg: parser label Jun 3, 2021

tony-go mentioned this pull request Jun 11, 2021

[Bug]: Omitted spread properties are incorrectly hoisted when using computed properties with template strings #13430

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feat: use refExpressionErrors to catch optional parameters

6b29e13

tony-go added 2 commits June 11, 2021 16:52

feat: delete useless refNeedArrowPos

b443d89

fix: forgotten deletion

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JLHwung changed the title ~~fix(parser:expression): remove refNeedsArrowPos in parseExprListItem~~ refactor(parser): remove refNeedsArrowPos Jun 11, 2021

tony-go added 3 commits June 11, 2021 18:04

fix: lint and factorize

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fix: delete useless comment

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fix: review corrections

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fix: review corrections pt2

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fix: nit correction

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tony-go requested a review from nicolo-ribaudo June 18, 2021 10:19

tony-go mentioned this pull request Jun 18, 2021

[Bug]: async(x?) should throw #13446

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nicolo-ribaudo merged commit 101249f into babel:main Jun 19, 2021

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refactor(parser): remove refNeedsArrowPos #13419

refactor(parser): remove refNeedsArrowPos #13419

tony-go commented Jun 3, 2021 •

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refactor(parser): remove refNeedsArrowPos #13419

refactor(parser): remove refNeedsArrowPos #13419

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