Add react-i18n package with i18n React bindings #28465
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jsnajdr
added
Internationalization (i18n)
jsnajdr
requested review from
adamsilverstein,
ajitbohra,
chrisvanpatten and
gziolo
as code owners
| // rerender translations whenever a hook is removed or added | ||
| useEffect( () => { | ||
| hooks.addAction( 'hookAdded', 'core/react-i18n/filters', () => | ||
| forceUpdate() | ||
| ); | ||
| hooks.addAction( 'hookRemoved', 'core/react-i18n/filters', () => | ||
| forceUpdate() | ||
| ); | ||
| return () => { | ||
| hooks.removeAction( 'hookAdded', 'core/react-i18n/filters' ); | ||
| hooks.removeAction( 'hookRemoved', 'core/react-i18n/filters' ); | ||
| }; | ||
| }, [] ); |
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Should filtering perhaps better be handled by #27966?
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@leewillis77 is working on adding filters to the i18n package. I would be curious to learn how much those two PRs overlap.
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That's a question for @yuliyan, who added this feature in Automattic/wp-calypso#44743, presumably to implement a i18n feature like Community Translator. @yuliyan did you implement the feature you needed the hooks for yet?
And would it be ok if these hooks were not in the react-i18n library, but directly in the I18n instance in @wordpress/i18n?
Another difference is that @leewillis77's work in #27966 and also the Core translate PHP function only have hooks to modify the gettext result after the translation, and not its arguments before translation. @yuliyan's version has a preTranslation hook that can modify these arguments.
I'd personally prefer to move the hooks support to the core I18n class and simplify the React bindings as much as possible. But we need to make sure that the features that depend on these hooks are OK with that.
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That's a question for @yuliyan, who added this feature in Automattic/wp-calypso#44743, presumably to implement a i18n feature like Community Translator.
That's correct, but the implementations are still in a draft state and have not been released yet.
And would it be ok if these hooks were not in the
react-i18nlibrary, but directly in theI18ninstance in@wordpress/i18n?
I think it would be even better to have them directly in the I18n instance, though react-i18n bindings should still maintain reactivity when adding/removing hooks.
Another difference is that @leewillis77's work in #27966 and also the Core
translatePHP function only have hooks to modify thegettextresult after the translation, and not its arguments before translation. @yuliyan's version has apreTranslationhook that can modify these arguments.
I like the implementation in #27966 as it looks closer to the core PHP gettext function filters and essentially provides the same functionality as the postTranslation filter here.
As for the lack of preTranslation - I can't tell if it's a mandatory feature, but it would definitely come in handy. The first use case that pop into my head would be to use it for implementing a different translation lookup logic, in case the JED file uses translation keys other than the original string (e.g. hashes, ids, etc.).
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I think it would be even better to have them directly in the
I18ninstance
Perfect! That means I can remove them from the react-i18n bindings in this PR.
though
react-i18nbindings should still maintain reactivity when adding/removing hooks.
That can be implemented in i18n by registering the hookAdded/hookRemoved callbacks and fire a subscribe event when a relevant i18n.* hook changes. At this moment, subscribe listeners are notified only on setLocaleData() calls, now they'll also be notified when hooks change.
As for the lack of
preTranslation- I can't tell if it's a mandatory feature, but it would definitely come in handy. The first use case that pop into my head would be to use it for implementing a different translation lookup logic, in case the JED file uses translation keys other than the original string
OK, but that sounds like a rather hypothetical use case to me, not something we need in near future. Or is it needed for any of the existing i18n-calypso hooks and filters that we use, e.g., for Community Translator or for highlighting untranslated strings in the UI?
The pre_gettext hooks can be added at any later time to @wordpress/i18n.
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That can be implemented in
i18nby registering thehookAdded/hookRemovedcallbacks and fire asubscribeevent when a relevanti18n.*hook changes. At this moment,subscribelisteners are notified only onsetLocaleData()calls, now they'll also be notified when hooks change.
Sounds good!
Or is it needed for any of the existing
i18n-calypsohooks and filters that we use, e.g., for Community Translator or for highlighting untranslated strings in the UI?
No, it's not needed for any of the existing features. Although, i18n-calypso supports the mentioned translation lookup feature, we are not currently using it.
If you'd still like to go this route, there are a couple of options you may not have considered:
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@sirreal I'd love to add the TypeScript support back, but it was a too big task for me to do everything at once. I'll try to re-add the TS syntax after the dust settles on other parts of this PR 🙂 |
| ...tannin.data[ domain ][ '' ], | ||
| }; | ||
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| listeners.forEach( ( listener ) => listener() ); |
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Would it make sense to use doAction here instead?
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Something like doAction( 'i18n.update' )? That's an interesting idea! 👍
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I tried to implement @yuliyan's suggestion with the doAction hook, but then found it's not practical to work with.
With the hook, it's no longer enough to pass an I18n instance as a prop the I18nProvider. I also need to pass along an instance of the Hooks object, the one that was used to construct that I18n instance. Because there's no direct way to subscribe to the I18n instance, I need to go indirectly through Hooks.
Also, what if I have multiple instances of I18n created with the same instance of Hooks? That's going to happen in the "real-time locale switcher" use case. Then the doAction hook would need to receive the I18n instance as a parameter, and the callback would need to check if the action fired for our instance, or for someone else.
In the end, I'm finding a I18n.subscribe method to be more practical.
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@leewillis77 I'll try to add the filter. I'll need to figure out which filter to call: |
I think it should be a new filter, something like: Type annotations are probably required on the return value from applyFilters. The only other complication is that unsupplied values are passed as undefined to the other filters, whereas it looks like you'd pass "default" here (e.g. for WordPress core strings which have no text-domain). |
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Because we don't rely on TypeScript compiling jsx, I think we can move this to the base config.
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Turns out the jsx options already is in the base config. I don't know why I felt I need to add it here, too. Removed in the latest commit.
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I feel like the TS build tooling changes should be done in a separate PR. Does the rest of the core team agree that this move to TS makes sense? Aside: why not |
I agree, that would be nice to isolate.
TypeScript requires TypeScript files that include JSX to use the
This is very minor in practice, but does require using |
I agree, I'm trying to make the entire package work end-to-end and figure out what it takes. Then we can merge independent parts incrementally.
I was getting TypeScript compiler errors where it couldn't recognize the JSX syntax unless the file had a |
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OK, as @sirreal explains, the |
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The Javascript standards don't seem to be clear on case selection for filter names. The closest I can find would be this which suggests "camel case with a lower case first letter": If that seems sensible then I'll:
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@leewillis77 The coding standard specifies only names for variables and functions, not for hooks identifiers, as far as I see. Consistency with WordPress Core PHP hook names is a very strong argument in favor of |
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@leewillis77 FYI that I renamed the |
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Status of this PR: All the changes I wanted here are done and all checks are green. Time to start merging this step-by-step. There are three broad areas where this PR modifies things:
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"domain" here is still being passed to filters as "default" rather than "undefined" for calls with no domain due to the default value in the method signature. That's different behaviour from the other i18n. filters so would be nice to standardise.
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@swissspidy This dream has finally come true 🙂 The |
Yay :-) nice work! Looks good to me even though I personally wouldn't have written it in TS in the first place :-) |
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Thanks everyone for collaboration ❤️ Going to merge the PR now. |
6 participants
Adds
react-i18npackage inspired by @sirreal's work in Calypso and by experimental locale switching by @swissspidy in #27973.@sirreal and @swissspidy are the actual authors of the code I would say, I act mostly as a copy&paster here 🙂
The
react-i18nbindings read from theI18ninstance, supplied as a prop to the context provider, and makes the i18n functions available to children React components that use the consumer hook.I added some methods to
@wordpress/i18nthat are needed by thereact-i18nbindings for a concise and hack-free implementation:defaultI18ninstance, so that we can pass it around as a whole.getLocaleDatamethod.hasTranslationmethod.subscribemethod that notifies listeners about changes made byi18n.setLocaleData.The
@wordpress/hookspackage gets adefaultHooksexport, again, so that we can pass it around as a parameter.The React bindings automatically rerender dependent components when the
i18ninstance changes, when new data are set on it withi18n.setLocaleData, or when a pre/post-translation hook is added or removed (cc @yuliyan for review).Types:
I originally wanted to add native TypeScript sources for
react-i18n, but ran into unsolvable problems when I tried. One of them are insufficient typings for imported packages. The Gutenberg monorepo doesn't have types forcreateHigherOrderComponentfrom@wordpress/compose, so I was unable to use it in a type-safe way.