How can I define a return type of void for a function in a Typescript interface?

typescript

You have two options for syntax for a function-typed interface member, which are equivalent here:

interface IStateService {    network: (action: string) => void;}

interface IStateService {    network(action: string): void;}

typescript

That is close to the "type literal" syntax, but the braces are required for that:

interface IStateService {    network: { (action: string): void; }}

This is the full syntax, and allows defining overloads, like this:

interface IStateService {    network: {        (): string;        (action: string): void;    }}

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