@homebound/graphql-typescript-scalar-type-policies

This is a graphql-code-generator plugin that generates type policies for every field that uses custom scalars.

Overview

Given a config like:

generates:
  integration/graphql-types.ts:
    config:
      scalars:
        Date: "src/dates#Date"
      scalarTypePolicies:
        Date: "src/dates#dateTypePolicy"

And a schema that uses Date fields:

scalar Date

type Author {
    name: String!
    date: Date
}

This plugin generates the following snippet in the output file:

import { dateTypePolicy } from "src/dates";

export const scalarTypePolicies = {
  Author: { date: dateTypePolicy }
};

Where the dateTypePolicy const should implement the Apollo Client FieldPolicy.