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feat(i18n): add support for i18next pluralization keys #2980

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feat(i18n): add support for i18next pluralization keys #2980

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21 changes: 18 additions & 3 deletions boilerplate/app/i18n/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -60,10 +60,17 @@ export const initI18n = async () => {

/**
* Builds up valid keypaths for translations.
* Includes support for i18next pluralization keys by stripping suffixes.
*/

export type TxKeyPath = RecursiveKeyOf<Translations>

// i18next pluralization suffixes
type PluralSuffixes = "_zero" | "_one" | "_two" | "_few" | "_many" | "_other"

// Helper to strip plural suffixes from keys
type StripPluralSuffix<T extends string> = T extends `${infer Base}${PluralSuffixes}` ? Base : T

// via: https://stackoverflow.com/a/65333050
type RecursiveKeyOf<TObj extends object> = {
[TKey in keyof TObj & (string | number)]: RecursiveKeyOfHandleValue<TObj[TKey], `${TKey}`, true>
Expand All @@ -81,6 +88,14 @@ type RecursiveKeyOfHandleValue<
? Text
: TValue extends object
? IsFirstLevel extends true
? Text | `${Text}:${RecursiveKeyOfInner<TValue>}`
: Text | `${Text}.${RecursiveKeyOfInner<TValue>}`
: Text
?
| Text
| `${Text}:${RecursiveKeyOfInner<TValue>}`
| StripPluralSuffix<Text>
| `${StripPluralSuffix<Text>}:${RecursiveKeyOfInner<TValue>}`
:
| Text
| `${Text}.${RecursiveKeyOfInner<TValue>}`
| StripPluralSuffix<Text>
| `${StripPluralSuffix<Text>}.${RecursiveKeyOfInner<TValue>}`
: Text | StripPluralSuffix<Text>