How to declare a Map type in typescript?

Issue

I want to declare a type like this:

interface DependData {[key: string]: string};

but with error like this:

Statements are not allowed in ambient contexts

Solution

The error message you are describing occurs in a declaration file.

To make this work, you need remove the semi-colon at the end of your interface declaration:

interface DependData {
    [key: string]: string;
}

The extra semi-colon is causing an empty statement to be parsed in addition to the interface declaration, thus giving that error message.

Answered By - David Sherret