Property is used before its initialization error is only shown during compilation when using ES2022 but is with ESNext

[alan-agius4]

Bug Report

🔎 Search Terms

• property is used before its initialization
• esnext
• es2022
• before its initialization

🕗 Version & Regression Information

• Does not seem to be a regression.

⏯ Playground Link

ESNext: https://www.typescriptlang.org/play?useDefineForClassFields=true&target=99&ts=5.1.0-dev.20230315&ssl=4&ssc=2&pln=1&pc=1#code/MYGwhgzhAEBiD29oG9oChqegIzAJ2gF5oAXACwEsIA6bAVwC8BuDLYeAOwhLzuBPh4AFAAc8FAG5gSAUxyMAXNDocA1h3gB3DgEoUAXzT6gA

ES2022: https://www.typescriptlang.org/play?useDefineForClassFields=true&target=9&ts=5.1.0-dev.20230315&ssl=4&ssc=2&pln=1&pc=1#code/MYGwhgzhAEBiD29oG9oChqegIzAJ2gF5oAXACwEsIA6bAVwC8BuDLYeAOwhLzuBPh4AFAAc8FAG5gSAUxyMAXNDocA1h3gB3DgEoUAXzT6gA

💻 Code

class Foo { 
    bar = this.buz;
    constructor(private buz: unknown) {}
}

🙁 Actual behavior

TSC correctly produces the below compilation error when targeting ESNext. But does not when targeting ES2022.

TS2729: Property 'buz' is used before its initialization.

🙂 Expected behavior

The same compilation error is shown when targetting ES2022.

[Ozz760]

Hello Alan,
I was wondering if I can take this issue?

[alan-agius4]

Go for it

[Ozz760]

Hello,
While I was researching this issue there were similar issue's that came up.
#45325
#45182
I'm not sure if this is consider as a duplicate.
Please let me know.
Thank you.

[alan-agius4]

It’s not a duplicate as those issues are closed and problem still persists.

It appears that the problem was only fixed for esnext.

[Dev79844]

Hey Alan!
I would like to work on this issue if anyone is not working on it.

[alan-agius4]

@Dev79844, no one has opened a PR so far so feel free to open one.

[Hazmi35]

Can confirmed this issue is happening with 5.0.4. Maybe related #50971 and #52331

ES2022 (and above, including ESNext) implies useDefineForClassFields: true. TS2729 will happen if this option is set to true.

On ESNext, if you set the option to true, TS2729 shows up, and when false it doesn't. This is expected.

But on ES2022, even with useDefineForClassFields: true explicitly set to true, there are no TS2729 errors.

[Anshul-target]

@alan-agius4 I am new to opensource could you suggest how would I test the error.
I have set up the project locally

[alan-agius4]

@Anshul-target, please see the contributing guidelines.

[moheet333]

Hey @alan-agius4 does the PR #53885 fix this issue?