Strict mode "use strict"

[bjornet]

I'm trying to run the REPL with strict mode "use strict" which seems to break the inline evaluation.

How to reproduce

• create a javascript file
• run "JS Repl: Run" from the command menu
• add "use strict" on first line

What is expected to happen

• the REPL is evaluating as per documentation

What is actually happening

• the REPL throws an error Illegal 'use strict' directive in function with non-simple parameter list

---

I'm unsure if this is a bug or if it is a lacking feature.. anyways, it would be quite useful to be able to run the REPL in strict mode. Let me know if I misunderstood anything.

[axilleasiv]

Hi @bjornet, I am sorry that you are having this issue. This is a known missing feature that I would like to support at some time. I haven't yet investigated how much time I need to implement this but I think that one of the next versions of the repl extension could support the use strict mode. So I will mark this as a feature request and I will let you know when it is ready.

Thank you so much for your feedback and feel free to post again if you have any other issues or questions.

[bjornet]

Ah i see. Thanks again.

mån 7 juni 2021 kl. 21:34 skrev Achilleas Kiritsakas < @.***>:

Hi @bjornet https://github.com/bjornet, I am sorry that you are having this issue. This is a known missing feature that I would like to support at some time. I haven't yet investigated how much time I need to implement this but I think that one of the next versions of the repl extension could support the use strict mode. So I will mark this as a feature request and I will let you know when it is ready.

Thank you so much for your feedback and feel free to post again if you have any other issues or questions.

— You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub https://github.com/axilleasiv/vscode-javascript-repl-docs/issues/29#issuecomment-856201826, or unsubscribe https://github.com/notifications/unsubscribe-auth/AAEMKNI3C7AQUP53V57C3KLTRUNL3ANCNFSM46BS47BQ .

[imjordanxd]

also experiencing this, but in a TS repl

[Evertt]

This also happens for me, but I don't even have "use strict" in the repl file, so I don't know why that directive is even activated...

[VimCommando]

This is super easy to trip into on a Typescript projects.

Check your tsconfig.json and see if "compilerOptions.strict": true is set.

[EvanLovely]

This is super easy to trip into on a Typescript projects.

Check your tsconfig.json and see if "compilerOptions.strict": true is set.

That was what was happening to me; thanks for calling it out! Anyone know of a way to override my tsconfig.json settings for saved REPL files?

[niieani]

You can keep compilerOptions.strict: true, you just need to set compilerOptions.alwaysStrict: false. But yeah, this should be fixed. Ideally the extension should remove 'use strict' before executing the file internally.

[jpshack-at-palomar]

@niieani's suggestion works for me! added to tsconfig.json in project root directory :

{
  "compilerOptions": {
    "alwaysStrict": false
  }
}