fix(29890): JSX: "extract to constant" generates invalid code

[a-tarasyuk]

Fixes #29890

[DanielRosenwasser]

Wonder how this works for JsxText.

@typescript-bot pack this

[typescript-bot]

Heya @DanielRosenwasser, I've started to run the tarball bundle task on this PR at 0a83aed. You can monitor the build here.

[typescript-bot]

Hey @DanielRosenwasser, I've packed this into an installable tgz. You can install it for testing by referencing it in your package.json like so:

{
    "devDependencies": {
        "typescript": "https://typescript.visualstudio.com/cf7ac146-d525-443c-b23c-0d58337efebc/_apis/build/builds/75182/artifacts?artifactName=tgz&fileId=D9012AF62A68ECA65C1B6214BF8565115DD6B2CA9F8A99AF4573168E675756A402&fileName=/typescript-4.0.0-insiders.20200529.tgz"
    }
}

and then running npm install.

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There is also a playground for this build.

[a-tarasyuk]

Wonder how this works for JsxText.

@DanielRosenwasser I think QF won't be suggested.