graphql-typed-client/src/client/applyTypeMapperToVariable.test.ts

A tool that generates a strongly typed client library for any GraphQL endpoint. The client allows writing GraphQL queries as plain JS objects (with type safety, awesome code completion experience, custom scalar type mapping, type guards and more)

import { renderTypeMap } from '../render/typeMap/renderTypeMap'
import { schemaRenderTest } from '../testHelpers/render'
import { linkTypeMap } from './linkTypeMap'
import { applyTypeMapperToVariable } from './applyTypeMapperToVariable'

const getRoot = async () => {
  const result = await schemaRenderTest(
    /* GraphQL */ `
      scalar Date

      input Nested {
        scalar: Date
      }

      input Object {
        unrelated: Int!
        nullable: Int
        scalar: Date!
        nested: Nested!
      }

      type Query {
        field(scalar: Date!, object: Object!, list: [Object!]!): Boolean!
      }
    `,
    renderTypeMap,
  )

  const typeMap = linkTypeMap(JSON.parse(result))
  if (!typeMap.Query) throw new Error('query type is missing')
  return typeMap.Query
}

describe('applyTypeMapperToVariable', () => {
  test('passes unchanged values  when type mapper is not provided', async () => {
    const root: any = await getRoot()

    const date = new Date()

    expect(applyTypeMapperToVariable(date, root.fields.field.args.scalar[1])).toBe(date)
    expect(
      applyTypeMapperToVariable(
        { unrelated: 3, nullable: null, scalar: date, nested: { scalar: date } },
        root.fields.field.args.object[1],
      ),
    ).toEqual({ unrelated: 3, nullable: null, scalar: date, nested: { scalar: date } })
    expect(
      applyTypeMapperToVariable(
        [{ scalar: date, nested: { scalar: date } }, { scalar: date }],
        root.fields.field.args.list[1],
      ),
    ).toEqual([{ scalar: date, nested: { scalar: date } }, { scalar: date }])
  })

  test('passes serialized values when type mapper is provided', async () => {
    const root: any = await getRoot()

    const date = new Date()
    const dateString = date.toISOString()
    const typeMapper = {
      Date: {
        serialize: (d: Date) => d.toISOString(),
        deserialize: (d: string) => new Date(d),
      },
    }

    expect(applyTypeMapperToVariable(date, root.fields.field.args.scalar[1], typeMapper)).toBe(dateString)
    expect(
      applyTypeMapperToVariable(
        { unrelated: 3, nullable: null, scalar: date, nested: { scalar: date } },
        root.fields.field.args.object[1],
        typeMapper,
      ),
    ).toEqual({ unrelated: 3, nullable: null, scalar: dateString, nested: { scalar: dateString } })
    expect(
      applyTypeMapperToVariable(
        [{ scalar: date, nested: { scalar: date } }, { unrelated: 3, nullable: null, scalar: date }],
        root.fields.field.args.list[1],
        typeMapper,
      ),
    ).toEqual([{ scalar: dateString, nested: { scalar: dateString } }, { unrelated: 3, nullable: null, scalar: dateString }])
  })
})