javascript - what is .d.ts file and why it is needed -


i'm reviewing source code angular-ui-router , there angular-ui-router.d.ts file inside api folder following content:

declare module ng.ui {      interface istate {         name?: string;         template?: string;         templateurl?: any; // string || () => string         templateprovider?: any; // () => string || ipromise<string>     }      interface itypedstate<t> extends istate {         data?: t;     }

i've read file typescript type definitions. it? why needed?

it's declaration file:

when typescript script gets compiled there option generate declaration file (with extension .d.ts) functions interface components in compiled javascript. in process compiler strips away function , method bodies , preserves signatures of types exported. resulting declaration file can used describe exported virtual typescript types of javascript library or module when third-party developer consumes typescript.

the concept of declaration files analogous concept of header file found in c/c++.


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