Fix: incorrect transform `jsx-runtime` in development #2741

Shinyaigeek · 2021-11-13T19:49:33Z

Motivation 🔥

Currently, swc does not transform JSX correctly with new JSX Transform in development mode. It is importing jsx from jsx-runtime when it should be importing jsxDEV from jsx-dev-runtime. (The same applies to jsxs).

I fixed this.

kdy1

This is not enough.
You have to handle special attributes like __source, too.

Shinyaigeek · 2021-11-14T11:13:32Z

Oh! Sorry, I overlooked it 🙇

I updated code with passing isStaticValidation, source, self (this) to jsxDEV, and not set __source and __self as props with "runtime": "automatic" config.

kdy1

I think there's are small issues with jsx directives.

kdy1 · 2021-11-14T12:25:20Z

crates/swc_ecma_transforms_react/src/jsx/mod.rs

@@ -596,13 +600,62 @@ where

                self.top_level_node = top_level_node;



I think this code will error if /* @jsxRuntime automatic */ is used.

Because of this, the babel plugin detect attributes named __source and __self and change those into arguments.

I’m sorry for that I did not know about jsx directives.

Because of this, the babel plugin detect attributes named __source and __self and change those into arguments.

Is this the process below?

https://github.com/babel/babel/blob/main/packages/babel-plugin-transform-react-jsx/src/create-plugin.ts#L502

I am worried if my understanding is correct, but should I fix the code to set __source and __self props as JSX attribute in development mode as usual?

Sorry for late response, I missed the email.

Is this the process below?

Yes.

Should I fix the code to set __source and __self props as JSX attribute in development mode as usual?

I think so, as it's what babel does

Thank you for your reply and help!

I fixed code like below

set __source and __self to props with jsx_src and jsx_self (as usual)

As babel plugin does, with runtime: automatic and development: true configuration, swc extract __source and __self from JSX’s attributes and set it as _jsxDEV’s arguments.

it looks like there are not test settings to test react module(= jsx with jsx_src and jsx_self) with a specific configuration, so I added integration testing directory to test react module with a specific configuration.

If there is yet something I missed, I will be happy if you pointed it out.

kdy1 · 2021-11-21T06:30:02Z

crates/swc_ecma_transforms_react/src/jsx/mod.rs

@@ -489,6 +495,44 @@ where
                                        continue;
                                    }

+                                    if !use_create_element
+                                        && i.sym == String::from("__source")


String::from("__source") is very inefficient.
You can compare JsWord to str like *i.sym === "__source ".

👍 1ed2c7b

crates/swc_ecma_transforms_react/src/jsx/mod.rs

kdy1 · 2021-11-21T06:30:49Z

crates/swc_ecma_transforms_react/src/jsx/mod.rs

@@ -468,6 +472,8 @@ where
                };

                let mut key = None;
+                let mut __source = None;


I think variable name should not use _ as a prefix as it has special meaning in rust.

👍 7fcafd2

I replaced __source with source_props, and __self with self_props.

crates/swc_ecma_transforms_react/src/jsx/mod.rs

kdy1 · 2021-11-21T06:32:14Z

crates/swc_ecma_transforms_react/src/jsx/mod.rs

+                        Some(key) => key,
+                        None => ExprOrSpread {
+                            spread: None,
+                            expr: Box::new(build_undefined_literal_value()),


Please use undefined(DUMMY_SP) instead.

I did not notice undefined util module 🙇

👍 0ac5ded

crates/swc_ecma_transforms_react/src/jsx/mod.rs

kdy1 · 2021-11-21T06:33:04Z

crates/swc_ecma_transforms_react/src/jsx/mod.rs

+                            })
+                            .as_arg(),
+                        ))
+                        .chain(Some(__source))


There's std::iter::once and it's better than using Some to create an iterator.

👍 75a12b8

crates/swc_ecma_transforms_react/src/jsx/mod.rs

kdy1

Thank you!

kdy1 · 2021-11-21T09:23:31Z

Code changes look fine to me, but can you add some more tests?
Actually this feature was once implemented by #2542, but I reverted it because it broke next.js

Shinyaigeek · 2021-11-23T10:30:29Z

Thank you!

I've added some tests on this, but I am wondering what more tests to add.

Can you share what happened or error logs when Next.js was broken? (I searched for the Next.js issue but couldn't find it)

kdy1 · 2021-11-23T10:34:34Z

@Shinyaigeek vercel/next.js#30302 (comment)
This was the issue, and thank you!

kdy1

Thanks!
I found some tiny issues.

crates/swc_ecma_transforms_react/src/jsx/mod.rs

kdy1 · 2021-12-01T09:29:23Z

crates/swc_ecma_transforms_react/tests/jsx/fixture/runtime/jsxdev-args-with-fragment/output.js

+    ]
+},
+void 0,
+true);


I got different output from babel.

var _jsxFileName = "/Users/kdy1/projects/lab/src/input.js"; import { jsxDEV as _jsxDEV } from "react/jsx-dev-runtime"; import { Fragment as _Fragment } from "react/jsx-dev-runtime"; var x = /*#__PURE__*/_jsxDEV(_Fragment, { children: [/*#__PURE__*/_jsxDEV("div", { children: "hoge" }, void 0, false, { fileName: _jsxFileName, lineNumber: 3, columnNumber: 9 }, this), /*#__PURE__*/_jsxDEV("div", { children: "fuga" }, void 0, false, { fileName: _jsxFileName, lineNumber: 4, columnNumber: 9 }, this)] }, void 0, true);

Seems like children of fragments are not visited?

Can you add e.visit_mut_children_with(self) to

swc/crates/swc_ecma_transforms_react/src/jsx_src/mod.rs

Line 38 in 79f6e2e

and

swc/crates/swc_ecma_transforms_react/src/jsx_self/mod.rs

Line 39 in 79f6e2e

I think this works. jsxdev-args-with-gragment test is placed in fixture, not in integration. This means jsx-src and jsx-self does not work while this test run. This output will be the same with babel’s output if we move this test into integration. I think this is a little confusing, so I moved this test case from fixture into integration in fdaaaa2

Shinyaigeek · 2021-12-05T18:27:57Z

I’m sorry I did not understand why #2542 broke next.js (vercel/next.js#30302 (comment)). I think there are enough test cases for this change, but I am also worried that this change will break next.js as vercel/next.js#30302 (comment) . Is there any documentation for running Next.js tests with the local version of swc? (I rewrote Cargo.toml of next-swc with {path = "..."}, I get a compile error ...)

kdy1 · 2021-12-06T06:20:15Z

@Shinyaigeek Same here. I don't understand the reason.

I think in this case it will be fine, as you added tests for all input. But if you want to try it, you can patch all swc dependencies in https://github.com/vercel/next.js/tree/c004322d138e1949437efb0b80e0973f3a3775cf/packages/next-swc/crates to use git or path dependency targeting your own branch and create a PR.

kdy1 · 2021-12-06T06:20:47Z

But I really think it will be fine in this case, as we tested all input.

Shinyaigeek · 2021-12-08T09:35:31Z

@kdy1 I see. It seems to be a tough task to test with next-swc, so is it okay to get a review as it is, and send a follow up issue & PR if there is any problem?

kdy1 · 2021-12-08T09:38:03Z

Yeah, I think it is better. Thanks for the pr again and I'll review it soon

kdy1

Thanks! I found one perf/code style issue.

kdy1 · 2021-12-08T14:22:08Z

crates/swc_ecma_transforms_react/src/jsx/mod.rs

+
+                let args = if self.development {
+                    args.into_iter()
+                        .chain(


I think .chain(once(undefined(DUMMY_SP).as_arg())).chain(once(Lit::Bool(Bool { span: DUMMY_SP, value: use_jsxs, }) .as_arg())) would be better.

OK 👍 Thank you for helping! I fixed in 5be5cf0

kdy1

LGTM. Thanks!

## Bug - [ ] Related issues linked using `fixes #number` - [ ] Integration tests added - [ ] Errors have helpful link attached, see `contributing.md` ## Feature - [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR. - [ ] Related issues linked using `fixes #number` - [ ] Integration tests added - [ ] Documentation added - [ ] Telemetry added. In case of a feature if it's used or not. - [ ] Errors have helpful link attached, see `contributing.md` ## Documentation / Examples - [ ] Make sure the linting passes by running `yarn lint` This PR applies - swc-project/swc#2741 This fixes `development` mode of jsx.

)

## Bug - [ ] Related issues linked using `fixes #number` - [ ] Integration tests added - [ ] Errors have helpful link attached, see `contributing.md` ## Feature - [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR. - [ ] Related issues linked using `fixes #number` - [ ] Integration tests added - [ ] Documentation added - [ ] Telemetry added. In case of a feature if it's used or not. - [ ] Errors have helpful link attached, see `contributing.md` ## Documentation / Examples - [ ] Make sure the linting passes by running `yarn lint` This PR applies - swc-project/swc#2741 This fixes `development` mode of jsx.

kdy1 added this to the v1.2.109 milestone Nov 13, 2021

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Shinyaigeek force-pushed the fix/incorrect-import-jsx-development-runtime branch from 19065d3 to e0fe330 Compare November 14, 2021 07:30

Shinyaigeek requested a review from kdy1 November 14, 2021 11:12

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kdy1 modified the milestones: v1.2.109, v1.2.110, v1.2.111, v1.2.112 Nov 17, 2021

Shinyaigeek force-pushed the fix/incorrect-import-jsx-development-runtime branch 2 times, most recently from fddc954 to 6351e01 Compare November 20, 2021 17:08

Shinyaigeek requested a review from kdy1 November 20, 2021 17:20

kdy1 reviewed Nov 21, 2021

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Shinyaigeek requested a review from kdy1 November 21, 2021 08:25

kdy1 removed this from the v1.2.112 milestone Nov 24, 2021

kdy1 added this to the v1.2.116 milestone Dec 1, 2021

Chore: add test case for fragment

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kdy1 modified the milestones: v1.2.116, v1.2.117, v1.2.118, v1.2.119 Dec 1, 2021

Shinyaigeek added 2 commits December 6, 2021 03:12

Update: use undefined(DUMMY_SP) instread of Boxing

8a8fc1e

Chore: move jsxdev-args-with-gragment test from fixture into integration

fdaaaa2

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Update: use chain instead of vec and into_iter

5be5cf0

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Merge branch 'main' into fix/incorrect-import-jsx-development-runtime

5af8a79

kdy1 enabled auto-merge (squash) December 10, 2021 08:46

kdy1 merged commit ed704c9 into swc-project:main Dec 10, 2021

kdy1 mentioned this pull request Dec 11, 2021

Update jsx transform of swc vercel/next.js#32383

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nicholasxjy pushed a commit to nicholasxjy/swc that referenced this pull request Dec 18, 2021

fix(es/react): Implement proper development handling (swc-project#2741

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Shinyaigeek mentioned this pull request Dec 31, 2021

2021年のしにゃい振り返り Shinyaigeek/Shinyaigeek#2

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ShravanSunder mentioned this pull request Jun 20, 2022

Unable to set swc option for automatic react runtime TypeStrong/ts-node#1800

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Fix: incorrect transform `jsx-runtime` in development #2741

Fix: incorrect transform `jsx-runtime` in development #2741

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		@@ -596,13 +600,62 @@ where

		self.top_level_node = top_level_node;

Fix: incorrect transform jsx-runtime in development #2741

Fix: incorrect transform jsx-runtime in development #2741

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Shinyaigeek commented Nov 13, 2021

Motivation 🔥

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Fix: incorrect transform `jsx-runtime` in development #2741

Fix: incorrect transform `jsx-runtime` in development #2741

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