how to create custom datatype in typescript?

Question

I have a object like below

export const appErrorTemplate = {
    NO_APP : {
        template : 'Unable to initialize #{0}()!',
        code : 'no-app'
    },
    NO_REQ_FOUND : {
        template : '#{0}() requires \'#{1}\' to process!',
        code : 'no-required-found'
    },
    MISMATH : {
        template : '#{0}() required #{1} but \'#{2}\' found!',
        code : 'mismatch'
    },
    NOT_SATISFY : {
        template : 'Given parameter on #{0}() does not satisfied #{1} constrains',
        code : 'not-satisfy'
    },
    UNKNOWN : {
        template : 'Something went wrong!',
        code : 'unknown'
    }
};

How to define datatype like object which has array of object on that each object will be string,string

Solution

It looks like you have not an array, but an object with a variable set of properties all of the same type. That can be described with a string index signature.

type AppErrorTemplateType = {
    [name: string]: {
        template: string,
        code: string
    }
};