Importing types from a private npm module with FlowTypes

Currently I am in the process of developing a private npm package for internal use. One challenge I am facing is how to include flowtypes that can be shared across different internal projects. Ideally, I would like these flowtypes to be imported in the format

import type {SomeType} from 'our-private-lib'
. What approach should I take to successfully include flow types with my npm package?

As of now, I have been transpiling all ES code using babel and utilizing flow-copy-source to copy original files alongside the transpiled ones, but with a .js.flow extension. This method, however, requires the names of these files to match the transpiled counterparts.

For instance, if I have a file located at /super-schema/index.js containing:

export type SuperSchemaType = {
 prop1: boolean,
 prop2: string
}

const SuperSchema = {
 prop1: true,
 prop2: 'Hello'
}

module.exports = SuperSchema;

And my package.json references the main file as index.js, which exports SuperSchema as follows:

module.exports = {
  superSchema: require('./super-schema.js/index.js');
}

I could then import this module like so:

import {superSchema} from 'our-private-lib';

However, integrating flowtype raises complications. The syntax

import type {SuperSchemaType} from 'our-private-lib';
does not seem to function as expected. Any suggestions on how to address this issue?

Answer №1

Your overall strategy is on point (employing flow-copy-source), however, to effectively access types from the main entry point of your module, you must export the types in some capacity. You can achieve this by explicitly exporting them like so

export type {
  SuperSchemaType
} from './super-schema';

Alternatively, if you are utilizing babel 7, using export type * could be advantageous for you

export type * from './super-schema';

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