Allowed non-this, non-super code before super call in derived classes with property initializers #29374

JoshuaKGoldberg · 2019-01-11T15:57:58Z

Starts on #8277 by allowing the non-this, non-super code to be root-level statements in the constructor. This will now be allowed:

class Base { }
class Derived extends Base {
    public prop = true;
    constructor(public paramProp = true) {
        console.log("Hello, world!");
        super();
    }
}

It feels wrong to put a new forEachChild loop in the checker, though in the vast majority of user files this will be a very quick one. Is there a better way to check for a reference to super or this?

Edit 2/28/2020: I've ~~mostly~~ resolved the merge conflicts introduced by both # private fields & useDefineForClassFields ~~, but I'm not confident my approach is still a valid one. I'd greatly appreciate it if someone could confirm I'm on the right track~~!
~~Oh, and gulp runtests passes locally (on Windows). I'll try a Mac to see if there's some odd encoding/whitespace behavior with the failing test...~~ ✔️

Edit 3/11/2021: It seems this is fairly close to merging.

Edit 1/13/2022: I bought this PR a birthday cake for its third birthday. https://twitter.com/JoshuaKGoldberg/status/1481654056422567944

Fixes microsoft#8277. It feels wrong to put a new `forEachChild` loop in the checker, though in the vast majority of user files this will be a very quick one. Is there a better way to check for a reference to `super` or `this`?

src/compiler/checker.ts

src/compiler/utilities.ts

weswigham · 2019-01-11T21:10:32Z

It feels wrong to put a new forEachChild loop in the checker, though in the vast majority of user files this will be a very quick one. Is there a better way to check for a reference to super or this?

TransformFlags.Super | TransformFlags.ContainsSuper for super at least.

src/compiler/utilities.ts

tests/baselines/reference/derivedClassSuperProperties.errors.txt

…boundaries ```ts function () { return this; } ``` It was immediately going to `ts.forEachChild` so the statement itself wasn't being counted as a new `this` scope.

ajafff

This is getting very complex very fast. I wonder if there's an easier way using the control flow graph?

src/compiler/utilities.ts

src/compiler/checker.ts

src/compiler/utilities.ts

tests/baselines/reference/derivedClassSuperProperties.js

… case

tests/baselines/reference/derivedClassSuperProperties.errors.txt

As per discussion in the issue, it would be ideal to consider any block that always ends up calling to super() the equivalent of a root-level super() statement. This would be valid: ```ts foo = 1; constructor() { condition() ? super(1) : super(0); this.foo; } ``` ...as it would compile to the equivalent of: ```ts function () { condition() ? super(1) : super(0); this.foo = 1; this.foo; } That change would a bit more intense and I'm very timid, so leaving it out of this PR. In the meantime the requirement is that the super() statement must itself be root-level.

src/compiler/utilities.ts

RyanCavanaugh · 2019-01-25T00:27:05Z

cc @ahejlsberg for review

JoshuaKGoldberg · 2019-04-02T18:52:39Z

Ping @ahejlsberg - is there anything that needs to be done here? It'd be nice to have this in 😄

JoshuaKGoldberg · 2019-07-16T17:59:21Z

Correction: ping, @weswigham?

typescript-bot · 2022-01-14T02:22:59Z

Heya @rbuckton, I'm starting to run the inline community code test suite on this PR at 1b3dd6d. Hold tight - I'll update this comment with the log link once the build has been queued.

rbuckton · 2022-01-14T04:28:47Z

@rbuckton Is there anything else that @JoshuaKGoldberg can do to move this forward?

Nope, it looks ready to go actually, and just in time for 4.6 beta.

JoshuaKGoldberg · 2022-01-14T14:32:17Z

Fantastic, thanks so much for the reviews & merge @rbuckton!

If any issues come out of this change I'm available to try to fix, if that's helpful.

NaveedAhmadHematmal · 2022-01-14T18:16:02Z

The longest-living PR I have ever seen. 😳

lukescott · 2022-01-20T17:10:30Z

YES!!! Thank you!🎉 🎉 🎉

callumok2004 · 2022-01-22T17:09:49Z

🥳🎉🎉

iJungleboy · 2022-03-07T07:50:23Z

Amazing work and perseverance. Awesome!

EstopaceMA · 2022-03-18T16:15:58Z

Man! Awesome. The perseverance! 🎉

vladboss61 · 2022-07-07T21:04:58Z

Does it mean that now super is going to be invoked the first time never mind where he is located in the constructor?

…rosoft/TypeScript#29374 The minimum TypeScript dependency is lifted to 4.6.2

jfortier-haptiq · 2022-07-28T15:27:06Z

Congrats, apparently the cake did it's job! 🎉

gbersac · 2022-07-28T15:31:49Z

Guy you've made it reddit programmer humor front page! https://www.reddit.com/r/ProgrammerHumor/comments/waa0lz/if_youre_ever_frustrated_that_your_github_prs/

taylus · 2022-07-28T18:36:28Z

grats on the PR

upq · 2022-07-28T19:55:49Z

Congrats !! Happy for you!
Might as well be the most famous PR yet ... from branding perspective I recommend you naming the PR
Suggestion: Des Supa

ajafff suggested changes Jan 11, 2019

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Used new isNewThisScope utility and dummy prop in baselines

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Accounted for parameters and get/set accessor bodies

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ajafff reviewed Jan 11, 2019

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Accounted for class extensions

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JoshuaKGoldberg commented Jan 12, 2019

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(node|statement)RefersToSuperOrThis wasn't checking root level scope …

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…boundaries ```ts function () { return this; } ``` It was immediately going to `ts.forEachChild` so the statement itself wasn't being counted as a new `this` scope.

ajafff suggested changes Jan 12, 2019

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ajafff reviewed Jan 12, 2019

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JoshuaKGoldberg mentioned this pull request Jan 13, 2019

Added error for class properties used within their own declaration #29395

Merged

Better 'references' name and comments; accounted for more method edge…

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JoshuaKGoldberg commented Jan 14, 2019

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JoshuaKGoldberg mentioned this pull request Jan 14, 2019

Always allow code before super call when it does not use "this" #8277

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Josh Goldberg added 3 commits January 15, 2019 14:40

Merge branch 'master'

da71ed9

Fixed error number following 'master' merge

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ajafff suggested changes Jan 18, 2019

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Josh Goldberg added 2 commits January 20, 2019 20:30

Added decorator test cases

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Again allowed arrow functions

e4dca14

RyanCavanaugh assigned weswigham Jan 25, 2019

MaxGraey mentioned this pull request Jan 30, 2019

Implement calls to 'super()' AssemblyScript/assemblyscript#445

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nicolo-ribaudo mentioned this pull request Feb 28, 2019

@babel/plugin-transform-typescript can insert public property initialization before the call to super. babel/babel#9609

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RyanCavanaugh added this to the TypeScript 3.6.0 milestone Jul 12, 2019

Merge branch 'master'

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rbuckton approved these changes Jan 14, 2022

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rbuckton merged commit b7fee7f into microsoft:main Jan 14, 2022

JoshuaKGoldberg deleted the non-this-super-before-super branch January 14, 2022 14:31

JoshuaKGoldberg mentioned this pull request Jan 24, 2022

Remove older emit support over time #47573

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5 tasks

kitsonk mentioned this pull request Feb 14, 2022

fix(io/buffer): super and initialized prop denoland/std#1917

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This was referenced Mar 3, 2022

Argument becomes implicit any when a void-returning overload follows a non-void-returning signature #48088

Open

Blog post: code-before-super JoshuaKGoldberg/Goldblog#335

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johnnyreilly mentioned this pull request Apr 1, 2022

[RFC] Towards Non-Fungible Types #48513

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This was referenced Apr 13, 2022

No-op string in constructor is repeated and reordered when constructor assignment is used #48671

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Fixed multiple prologue directives with parameter properties #48687

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p-szm mentioned this pull request Apr 19, 2022

Wrong constructor code generated when target is ES5 #48761

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jlusty mentioned this pull request Apr 19, 2022

Missing parameter properties when using class with private fields #48771

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AgnesToulet mentioned this pull request Jun 2, 2022

Repository Dispatch: improve error message for fork PRs grafana/grafana-github-actions#97

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eemeli added a commit to messageformat/messageformat that referenced this pull request Jul 16, 2022

fix(mf2): Use private member for ResolvedMessage cache, thanks to mic…

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…rosoft/TypeScript#29374 The minimum TypeScript dependency is lifted to 4.6.2

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Allowed non-this, non-super code before super call in derived classes with property initializers #29374

Allowed non-this, non-super code before super call in derived classes with property initializers #29374

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Allowed non-this, non-super code before super call in derived classes with property initializers #29374

Allowed non-this, non-super code before super call in derived classes with property initializers #29374

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