Using yarn vs npm with typescript docs

[CKGrafico]

When we want to use other TypeScript version and we do:
npm install typescript@3.5.3 -D
But when we use new features like const casting microsoft/TypeScript#29510 it does not compile.
Instead of that if we use:
yarn add typescript@3.5.3
Everything works

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[ianschmitz]

Sorry @CKGrafico, it's not clear to me what this PR is addressing. yarn vs npm shouldn't affect whether you can use a specific feature of TypeScript. We also don't include typescript as a dependency of our packages. It is solely controlled by your application's package.json.

[CKGrafico]

If I create a project using --typescript seems that is using an old version of typescript (maybe some dependency?)
You can test using this code.

function example() {
return [1, 'test'] as const;
}

'as const' is available since 3.5.1 if I'm not wrong.
If you install typescript using npm is not using the versions intalled, I 've reproduced this twice but maybe is only happening in our environments

[neilbryson]

We're using TypeScript with CRA + npm and it uses whatever version included in our devDependencies.

[stale]

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