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Co-authored-by: George Berezhnoy <gohabereg@users.noreply.github.com> Co-authored-by: Georgy Berezhnoy <gohabereg@gmail.com> Co-authored-by: tasuku-s <tasuku@freemind.co.jp> Co-authored-by: Athul Anil Kumar <athul7744@outlook.com> Co-authored-by: Taly <vitalik7tv@yandex.ru> Co-authored-by: flaming-cl <51183663+flaming-cl@users.noreply.github.com> Co-authored-by: Nguyen Ngoc Son <sonnn.se@gmail.com> Co-authored-by: Sisir Das K <37764463+sis-dk@users.noreply.github.com> Co-authored-by: Sisir <sisir@hellosivi.com>
69 lines
1.8 KiB
TypeScript
69 lines
1.8 KiB
TypeScript
/**
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* Decorator above the type object
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*/
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type Indexed<T> = { [key: string]: T };
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/**
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* Type for I18n dictionary values that can be strings or dictionary sub-sections
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*
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* Can be used as:
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* LeavesDictKeys<typeof myDictionary>
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*
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* where myDictionary is a JSON with messages
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*/
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export type LeavesDictKeys<D> = D extends string
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/**
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* If generic type is string, just return it
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*/
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? D
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/**
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* If generic type is object that has only one level and contains only strings, return it's keys union
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*
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* { key: "string", anotherKey: "string" } => "key" | "anotherKey"
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*
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*/
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: D extends Indexed<string>
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? keyof D
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/**
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* If generic type is object, but not the one described above,
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* use LeavesDictKey on it's values recursively and union the results
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*
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* { "rootKey": { "subKey": "string" }, "anotherRootKey": { "anotherSubKey": "string" } } => "subKey" | "anotherSubKey"
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*
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*/
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: D extends Indexed<any>
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? { [K in keyof D]: LeavesDictKeys<D[K]> }[keyof D]
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/**
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* In other cases, return never type
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*/
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: never;
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/**
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* Provide type-safe access to the available namespaces of the dictionary
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*
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* Can be uses as:
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* DictNamespaces<typeof myDictionary>
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*
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* where myDictionary is a JSON with messages
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*/
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export type DictNamespaces<D extends object> = {
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/**
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* Iterate through generic type keys
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*
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* If value under current key is object that has only one level and contains only strings, return string type
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*/
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[K in keyof D]: D[K] extends Indexed<string>
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? string
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/**
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* If value under current key is object with depth more than one, apply DictNamespaces recursively
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*/
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: D[K] extends Indexed<any>
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? DictNamespaces<D[K]>
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/**
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* In other cases, return never type
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*/
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: never;
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}
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