Is it possible for Visual Studio Code to create type declarations?

One of my tricks for quickly obtaining typings involves deriving them from actual data:

https://i.stack.imgur.com/EPtMm.png

I typically use a snippet like this:

const ParcelFeatureTypeInstance = {"displayFieldName":"NAMECO","fieldAliases":{"PIN":"PIN / Tax Map #","OWNAM1":"Owner Name(MixedCase)",...};
type ParcelFeatureType = typeof ParcelFeatureTypeInstance;

However, I want to enhance this method by being able to copy and paste the complete type definition. Currently, when I hover over the type, a popup window appears with an incomplete definition:

const ParcelFeatureTypeInstance: {
    displayFieldName: string;
    fieldAliases: {
        PIN: string;
        OWNAM1: string;
        OWNAM2: string;
        STREET: string;
        CITY: string;
        STATE: string;
        ZIP5: string;
        NAMECO: string;
        POWNNM: string;
        DEEDDATE: string;
        CUBOOK: string;
        ... 23 more ...;
        OBJECTID: string;
    };
    geometryType: string;
    spatialReference: {
        ...;
    };
    fields: ({
        ...;
    } | {
        ...;
    })[];
    features: {
        ...;
    }[];
}

I am wondering if there is a way to access the full type definition in a more convenient manner.

Answer №1

To create a .d.ts file, you can declare and emit it using the following method.

Firstly, in your example.ts file, define your constants and types as shown below:

const ParcelFeatureTypeInstance = {"displayFieldName":"NAMECO","fieldAliases":{"PIN":"PIN / Tax Map #","OWNAM1":"Owner Name(MixedCase)"}};
export type ParcelFeatureType = typeof ParcelFeatureTypeInstance;

Next, ensure your tsconfig.json includes the following configuration:

{
  "compilerOptions": {
    "declaration": true
  }
}

Finally, run the compiler with the command:

tsc -p tsconfig.json

This will generate a new file named example.d.ts containing the type declarations for your constants and variables.

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