forked from i18next/react-i18next
/
index.d.ts
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/
index.d.ts
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import i18next, {
ReactOptions,
i18n,
ThirdPartyModule,
Resource,
TOptions,
StringMap,
TFunctionResult,
} from 'i18next';
import * as React from 'react';
type Subtract<T extends K, K> = Omit<T, keyof K>;
/**
* Due to a limitation/bug on typescript 4.1 (https://github.com/microsoft/TypeScript/issues/41406), we added
* "extends infer A ? A : never" in a few places to suppress the error "Type instantiation is excessively deep and possibly infinite."
* on cases where users have more than 22 namespaces. Once the issue is fixed, we can remove all instances of the workaround used.
*
* Reference of the bug reported: https://github.com/i18next/react-i18next/issues/1222
*/
/**
* This interface can be augmented by users to add types to `react-i18next` default resources.
*
* @deprecated use the `resources` key of `CustomTypeOptions` instead
*/
export interface Resources {}
/**
* This interface can be augmented by users to add types to `react-i18next`. It accepts a `defaultNS`, `resources`, `returnNull` and `returnEmptyString` properties.
*
* Usage:
* ```ts
* // react-i18next.d.ts
* import 'react-i18next';
* declare module 'react-i18next' {
* interface CustomTypeOptions {
* defaultNS: 'custom';
* returnNull: false,
* returnEmptyString: false,
* resources: {
* custom: {
* foo: 'foo';
* };
* };
* }
* }
* ```
*/
export interface CustomTypeOptions {}
type MergeBy<T, K> = Omit<T, keyof K> & K;
type TypeOptions = MergeBy<
{
returnNull: true;
returnEmptyString: true;
keySeparator: '.';
defaultNS: 'translation';
resources: Resources;
},
CustomTypeOptions
>;
type DefaultResources = TypeOptions['resources'];
type DefaultNamespace<T = TypeOptions['defaultNS']> = T extends Fallback<string> ? T : string;
type Fallback<F, T = keyof DefaultResources> = [T] extends [never] ? F : T;
export type Namespace<F = Fallback<string>> = F | F[];
export function setDefaults(options: ReactOptions): void;
export function getDefaults(): ReactOptions;
export function setI18n(instance: i18n): void;
export function getI18n(): i18n;
export const initReactI18next: ThirdPartyModule;
export function composeInitialProps(ForComponent: any): (ctx: unknown) => Promise<any>;
export function getInitialProps(): {
initialI18nStore: {
[ns: string]: {};
};
initialLanguage: string;
};
export interface ReportNamespaces {
addUsedNamespaces(namespaces: Namespace[]): void;
getUsedNamespaces(): string[];
}
declare module 'i18next' {
interface i18n {
reportNamespaces: ReportNamespaces;
}
}
// Normalize single namespace
type AppendKeys<K1, K2, S extends string = TypeOptions['keySeparator']> = `${K1 & string}${S}${K2 &
string}`;
type AppendKeys2<K1, K2, S extends string = TypeOptions['keySeparator']> = `${K1 &
string}${S}${Exclude<K2, keyof any[]> & string}`;
type Normalize2<T, K = keyof T> = K extends keyof T
? T[K] extends Record<string, any>
? T[K] extends readonly any[]
? AppendKeys2<K, keyof T[K]> | AppendKeys2<K, Normalize2<T[K]>>
: AppendKeys<K, keyof T[K]> | AppendKeys<K, Normalize2<T[K]>>
: never
: never;
type Normalize<T> = keyof T | Normalize2<T>;
// Normalize multiple namespaces
type UnionToIntersection<U> = (U extends any ? (k: U) => void : never) extends (k: infer I) => void
? I
: never;
type LastOf<T> = UnionToIntersection<T extends any ? () => T : never> extends () => infer R
? R
: never;
type AppendNS<N, K> = `${N & string}:${K & string}`;
type NormalizeMulti<T, U extends keyof T, L = LastOf<U>> = L extends U
? AppendNS<L, Normalize<T[L]>> | NormalizeMulti<T, Exclude<U, L>>
: never;
type CustomTypeParameters = {
returnNull?: boolean;
returnEmptyString?: boolean;
};
type TypeOptionsFallback<TranslationValue, Option, MatchingValue> = Option extends false
? TranslationValue extends MatchingValue
? string
: TranslationValue
: TranslationValue;
/**
* Checks if user has enabled `returnEmptyString` and `returnNull` options to retrieve correct values.
*/
export type NormalizeByTypeOptions<
TranslationValue,
Options extends CustomTypeParameters = TypeOptions,
R = TypeOptionsFallback<TranslationValue, Options['returnEmptyString'], ''>
> = TypeOptionsFallback<R, Options['returnNull'], null>;
type NormalizeReturn<
T,
V,
S extends string | false = TypeOptions['keySeparator']
> = V extends keyof T
? NormalizeByTypeOptions<T[V]>
: S extends false
? V
: V extends `${infer K}${S}${infer R}`
? K extends keyof T
? NormalizeReturn<T[K], R>
: never
: never;
type NormalizeMultiReturn<T, V> = V extends `${infer N}:${infer R}`
? N extends keyof T
? NormalizeReturn<T[N], R>
: never
: never;
export type TFuncKey<N extends Namespace = DefaultNamespace, T = DefaultResources> = N extends
| (keyof T)[]
| Readonly<(keyof T)[]>
? NormalizeMulti<T, N[number]>
: N extends keyof T
? Normalize<T[N]>
: string;
export type TFuncReturn<N, TKeys, TDefaultResult, T = DefaultResources> = N extends (keyof T)[]
? NormalizeMultiReturn<T, TKeys>
: N extends keyof T
? NormalizeReturn<T[N], TKeys>
: Fallback<TDefaultResult>;
export interface TFunction<N extends Namespace = DefaultNamespace> {
<
TKeys extends TFuncKey<N> | TemplateStringsArray extends infer A ? A : never,
TDefaultResult extends TFunctionResult = string,
TInterpolationMap extends object = StringMap
>(
key: TKeys | TKeys[],
options?: TOptions<TInterpolationMap> | string,
): TFuncReturn<N, TKeys, TDefaultResult>;
<
TKeys extends TFuncKey<N> | TemplateStringsArray extends infer A ? A : never,
TDefaultResult extends TFunctionResult = string,
TInterpolationMap extends object = StringMap
>(
key: TKeys | TKeys[],
defaultValue?: string,
options?: TOptions<TInterpolationMap> | string,
): TFuncReturn<N, TKeys, TDefaultResult>;
}
export interface TransProps<
K extends TFuncKey<N> extends infer A ? A : never,
N extends Namespace = DefaultNamespace,
E extends Element = HTMLDivElement
> extends React.HTMLProps<E> {
children?: React.ReactNode;
components?: readonly React.ReactNode[] | { readonly [tagName: string]: React.ReactNode };
count?: number;
defaults?: string;
i18n?: i18n;
i18nKey?: K | K[];
ns?: N;
parent?: string | React.ComponentType<any> | null; // used in React.createElement if not null
tOptions?: {};
values?: {};
t?: TFunction<N>;
}
export function Trans<
K extends TFuncKey<N> extends infer A ? A : never,
N extends Namespace = DefaultNamespace,
E extends Element = HTMLDivElement
>(props: TransProps<K, N, E>): React.ReactElement;
export function useSSR(initialI18nStore: Resource, initialLanguage: string): void;
export interface UseTranslationOptions {
i18n?: i18n;
useSuspense?: boolean;
}
type UseTranslationResponse<N extends Namespace> = [TFunction<N>, i18n, boolean] & {
t: TFunction<N>;
i18n: i18n;
ready: boolean;
};
export function useTranslation<N extends Namespace = DefaultNamespace>(
ns?: N | Readonly<N>,
options?: UseTranslationOptions,
): UseTranslationResponse<N>;
// Need to see usage to improve this
export function withSSR(): <Props>(
WrappedComponent: React.ComponentType<Props>,
) => {
({
initialI18nStore,
initialLanguage,
...rest
}: {
initialI18nStore: Resource;
initialLanguage: string;
} & Props): React.FunctionComponentElement<Props>;
getInitialProps: (ctx: unknown) => Promise<any>;
};
export interface WithTranslation<N extends Namespace = DefaultNamespace> {
t: TFunction<N>;
i18n: i18n;
tReady: boolean;
}
export interface WithTranslationProps {
i18n?: i18n;
useSuspense?: boolean;
}
export function withTranslation<N extends Namespace = DefaultNamespace>(
ns?: N,
options?: {
withRef?: boolean;
},
): <
C extends React.ComponentType<React.ComponentProps<C> & WithTranslationProps>,
ResolvedProps = JSX.LibraryManagedAttributes<
C,
Subtract<React.ComponentProps<C>, WithTranslationProps>
>
>(
component: C,
) => React.ComponentType<Omit<ResolvedProps, keyof WithTranslation<N>> & WithTranslationProps>;
export interface I18nextProviderProps {
i18n: i18n;
defaultNS?: string;
}
export const I18nextProvider: React.FunctionComponent<I18nextProviderProps>;
export const I18nContext: React.Context<{ i18n: i18n }>;
export interface TranslationProps<N extends Namespace = DefaultNamespace> {
children: (
t: TFunction<N>,
options: {
i18n: i18n;
lng: string;
},
ready: boolean,
) => React.ReactNode;
ns?: N;
i18n?: i18n;
useSuspense?: boolean;
}
export function Translation<N extends Namespace = DefaultNamespace>(
props: TranslationProps<N>,
): any;