Update run.md

[justnixx]

Description

This PR updates the documentation to clarify that ts-node performs type checking by default unless transpileOnly is enabled.

The previous documentation suggested that ts-node does not perform type checking. However, testing confirms that it does type checking unless transpileOnly is explicitly enabled.

Validation

// example.ts
let username: string;
username = 22; // Type error

Running ts-node example.ts results in:

TSError: ⨯ Unable to compile TypeScript:
example.ts:3:1 - error TS2322: Type 'number' is not assignable to type 'string'.

ts-node -v output:

v10.9.2

This confirms that ts-node performs type checking by default in this version.

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Name	Status	Preview	Updated (UTC)
nodejs-org	✅ Ready (Inspect)	Visit Preview	Feb 2, 2025 9:24pm

[AugustinMauroy]

what is the pref cost of this ts-node feature ? if it's affect pref we should mention it

[justnixx]

I didn’t notice any delay during execution, and I’m not using a supercomputer—just a decent MacBook Pro. However, if performance is a concern (e.g., for production or fast iteration cycles), enabling the transpileOnly flag (ts-node --transpile-only) can speed up execution by skipping type checking. However, this means that type errors won’t be caught at runtime

…

On Sun, Feb 2, 2025 at 4:48 PM Augustin Mauroy ***@***.***> wrote: what is the pref cost of this ts-node feature ? if it's affect pref we should mention it — Reply to this email directly, view it on GitHub <#7466 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AK54BNVW7RCUVARCXOZHQVL2N2HDRAVCNFSM6AAAAABWKZIZF2VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDMMRZGU3TAOJTGY> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[ovflowd]

LGTM although this content should be updated -- cc @marco-ippolito

[github-actions]

Lighthouse Results

URL	Performance	Accessibility	Best Practices	SEO	Report
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/en/about	🟢 99	🟢 100	🟢 100	🟢 91	🔗
/en/about/previous-releases	🟢 92	🟢 100	🟢 100	🟢 92	🔗
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[github-actions]

Unit Test Coverage Report

Lines	Statements	Branches	Functions
	88.71% (739/833)	75.94% (240/316)	87.65% (142/162)

Unit Test Report

Tests	Skipped	Failures	Errors	Time
182	0 💤	0 ❌	0 🔥	5.417s ⏱️

[smith558]

@ovflowd reminder, code review comments in progress?