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elasticsearch-js/docs/typescript.asciidoc
2019-02-14 16:25:03 +01:00

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= TypeScript support
The client offers a first-class support for TypeScript, since it ships the type definitions for every exposed API.
While the client offers type definitions for Request parameters, Request bodies and responses are shipped with `any` because there is not an official spec that defines them, so we cannot make guarantees over them (but since they are shipped with `any`, you can easily override them with your own typing definitions).
NOTE: If you are using TypeScript you will be required to use _snake_case_ style to define the API parameters instead of _camelCase_.
== How to extend the provided typings?
Extend the provided typings is very straightforward, you should declare a custom `.d.ts` file and then write inside your type extensions, following there is an example of how do it.
[source,ts]
----
declare module '@elastic/elasticsearch' {
export interface ShardsResponse {
total: number;
successful: number;
failed: number;
skipped: number;
}
export interface Explanation {
value: number;
description: string;
details: Explanation[];
}
export interface SearchResponse<T> {
took: number;
timed_out: boolean;
_scroll_id?: string;
_shards: ShardsResponse;
hits: {
total: number;
max_score: number;
hits: Array<{
_index: string;
_type: string;
_id: string;
_score: number;
_source: T;
_version?: number;
_explanation?: Explanation;
fields?: any;
highlight?: any;
inner_hits?: any;
matched_queries?: string[];
sort?: string[];
}>;
};
aggregations?: any;
}
export interface MSearchResponse<T> {
responses?: Array<SearchResponse<T>>;
}
}
export {};
----