Clarification on SF CLI use limitation with TypeScript

[jparta]

What does the limitation regarding using Salesforce CLI with TypeScript for LWC development mean in practice? Does this mean the source cannot be deployed to org?

The guide is here: https://developer.salesforce.com/docs/platform/lwc/guide/ts.html

TypeScript Limitations

For now, LWC support for TypeScript excludes these use cases.

• Using TypeScript with the Salesforce CLI
• Source map debugging using TypeScript
• Non-Salesforce types
• Type definitions for custom Salesforce fields and objects

[wjhsf]

Does this mean the source cannot be deployed to org?

That's correct. You currently can only deploy JavaScript to your org, so you must compile any TypeScript code before deploying.