[compiler] health-check : improve check logic for next.js' stirctMode

[coleea]

Summary

How did you test this change?

1. I published changed code to https://www.npmjs.com/package/react-compiler-test

2. I created two next.js project. the one is app route-based and another one is page route-based

3. I tested every possible scenario (by running npx react-compiler-test.

3-1) App router + reactStrictMode: true => strict mode.
3-2) App router + reactStrictMode: false => non-strict mode.
3-3) App router + reactStrictMode option is not set => strict mode.
3-4) Page router + reactStrictMode: true => strict mode.
3-5) Page router + reactStrictMode: false => non-strict mode.
3-6) Page router + reactStrictMode option is not set => non-strict mode.

Test passed every case. the previous PR #29167 not covered the 3rd case.

Plus, I added some minor changes. the previous PR can cover reactStrictMode: true but does not cover reactStrictMode : true or reactStrictMode : true . I modified code to detect whitespace between reactStrictMode and :.

In addition, if <StrictMode> component is in comment (eg : // <StrictMode></StrictMode> ) , prevent recognizing it as a valid component.

In fact, multi-line comment also should be detected. However, it is difficult to detect this by regular expressions alone.
multi-line comment has three possible case
1)

/* 
    <StrictMode>
    <StrictMode/> 
*/

/* */
<StrictMode><StrictMode/> 

<StrictMode><StrictMode/> 
/* */

More sophisticated methods are needed to separate the three cases (eg : esprima). However, they were excluded from this PR.

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Name	Status	Preview	Comments	Updated (UTC)
react-compiler-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 26, 2024 7:55am

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[react-sizebot]

Comparing: f5d2feb...f9baf6f

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable/react-dom/cjs/react-dom.production.js	=	6.68 kB	6.68 kB	=	1.83 kB	1.83 kB
oss-stable/react-dom/cjs/react-dom-client.production.js	=	497.93 kB	497.93 kB	=	89.26 kB	89.26 kB
oss-experimental/react-dom/cjs/react-dom.production.js	=	6.69 kB	6.69 kB	=	1.83 kB	1.83 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js	=	502.75 kB	502.75 kB	=	89.96 kB	89.96 kB
facebook-www/ReactDOM-prod.classic.js	=	597.10 kB	597.10 kB	=	105.31 kB	105.31 kB
facebook-www/ReactDOM-prod.modern.js	=	571.44 kB	571.44 kB	=	101.24 kB	101.24 kB
test_utils/ReactAllWarnings.js	Deleted	62.88 kB	0.00 kB	Deleted	15.69 kB	0.00 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
test_utils/ReactAllWarnings.js	Deleted	62.88 kB	0.00 kB	Deleted	15.69 kB	0.00 kB

Generated by 🚫 dangerJS against f9baf6f

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[ojj1123]

I don't think what this healthcheck checks next config, is a good workaround.

The react frameworks are made continuously. Whenever the new frameworks are released, should react-compiler-heathcheck detect strictMode? Of course, there are a lot of Next.js users. But Next.js is based on React library. I think what we write the code in React for Next.js, is that React become to depend on Next.js. So I'm wondering why this PR and #29167 are needed.