# DGM Interview with Sang

## Implementation Challenge: Data Conversion

You're migrating data from one CMS to another, and the origin CMS stores a page layout with a type like this:

interface SrcComponentInstance {
    // the name of the target component
    name: string;
    // arguments given to the component
    args: {
        // name of the argument
        name: string;
        // value of the argument
        value: JSONValue;
    }[];
    // the contents of the component
    contents: (SrcComponentInstance | string)[];
};

The target CMS uses a different approach, giving a unique identifier to every single component and text snippet and using those references.

type Language = 'eng' | 'fra' | 'spa';
interface DestComponentInstance {
    // unique identifier for this component
    id: Id;
    // the name of the target component
    name: string;
    // the arugements given to the component
    args: {[k in string]?: JSONValue};
    // the ids of each child instance of the component
    contents: Id[];
};
interface DestTextInstance {
    // unique identifier for this text
    id: Id;
    // the content text, depending on the language
    content: {[k in Language]?: string};
};

Write a function that converts a list of top level `SrcComponentInstance`s to `DestComponentInstance`s:

const convert = (src: SrcComponentInstance[]): {[id in Id]?: DestComponentInstance} => {
        
}