type.locale_unsupported: Your code writes out a locale, such as Locale.fr_fr, that isn't in the app's list of supported locales

Your code writes out a locale, such as Locale.fr_fr, that isn't in the app's list of supported locales.

Area 10, Configuration; not declinable; the next step is usually the agent's.

Why Jadpo refuses it

Your app lists the locales it supports, once, in locales { }. Formatting and translations work only in those, so a deployable carries the language data of those locales and no others. A locale written out in code that the list doesn't have would format text in a language the app was never set up for.

Jadpo won't add the locale to the list for you when you could equally have meant one that is listed. The server's own locale is never used either, so the code says which one it means.

What it looks like

main.jadpo:

example

type OrderedAt = Instant {}locales {    default: Locale.en_gb    supported: [Locale.en_gb]}function placed_label(ordered_at: OrderedAt) -> PresentationText {    return text.format(        ordered_at,        zone: Zone.utc,        locale: Locale.fr_fr,        format: TimeFormat.date_long    )}

jadpo checkcheck failed: 1 error, 1 file

error Locale.fr_fr isn't a locale this application supports

--> main.jadpo:12:17

   |12 |         locale: Locale.fr_fr,   |                 ^^^^^^^^^^^^ not in `locales`

reason: text.format writes text in the locales listed in locales { supported: }, in app.jadpo; Locale.fr_fr is not one of them, and the server never guesses a language.
next: Add Locale.fr_fr to supported: in app.jadpo, or use a locale that is listed (agent)
rule: type.locale_unsupported
help: https://jadpo.dev/docs/errors/type.locale_unsupported

(agent) at the end of the next: line means your coding agent can make the fix itself.

How to fix it

If the app should support French, add it to supported::

example

    supported: [Locale.en_gb, Locale.fr_fr]

The date is written in French, and a deployable carries French's data. An app with translations then needs a French wording for each message.

If the text should be in the reader's language, take their locale as a parameter instead of writing one out:

example

function placed_label(ordered_at: OrderedAt, reader_locale: Locale) -> PresentationText {    return text.format(        ordered_at,        zone: Zone.utc,        locale: reader_locale,        format: TimeFormat.date_long    )}

The date is written in the locale the caller passes. A locale the app doesn't support that still arrives while the app runs is written in a supported locale of its language, or else in default:.

Why Jadpo refuses it

What it looks like

How to fix it

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