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GitHub - Code-Hex/graphql-codegen-typescript-validation-schema: GraphQL Code Generator plugin to generate form validation schema from your GraphQL schema

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GraphQL code generator plugin to generate form validation schema from your GraphQL schema.

Quick Start

Start by installing this plugin and write simple plugin config;

$ npm i graphql-codegen-typescript-validation-schema
generates:
  path/to/graphql.ts:
    plugins:
      - typescript
      - typescript-validation-schema # specify to use this plugin
    config:
      # You can put the config for typescript plugin here
      # see: https://www.graphql-code-generator.com/plugins/typescript
      strictScalars: true
      # Overrides built-in ID scalar to both input and output types as string.
      # see: https://the-guild.dev/graphql/codegen/plugins/typescript/typescript#scalars
      scalars:
        ID: string
      # You can also write the config for this plugin together
      schema: yup # or zod

It is recommended to write scalars config for built-in type ID, as in the yaml example shown above. For more information: #375

You can check example directory if you want to see more complex config example or how is generated some files.

The Q&A for each schema is written in the README in the respective example directory.

Config API Reference

schema

type: ValidationSchema default: 'yup'

Specify generete validation schema you want.

You can specify yup or zod or zodv4 or myzod or valibot.

generates:
  path/to/graphql.ts:
    plugins:
      - typescript
      - typescript-validation-schema
    config:
      schema: yup

zodImportPath

type: string default: 'zod'

Specifies a custom import path for the zod package. This is useful when you want to use a specific version or subpath of zod, such as the v3 compatibility layer in zod v4 ('zod/v3'). Only applies when schema is set to 'zod'.

generates:
  path/to/schemas.ts:
    plugins:
      - typescript
      - typescript-validation-schema
    config:
      schema: zod
      # Use zod v3 compatibility layer when using zod v4
      zodImportPath: zod/v3

importFrom

type: string

When provided, import types from the generated typescript types file path. if not given, omit import statement.

generates:
  path/to/graphql.ts:
    plugins:
      - typescript
  path/to/validation.ts:
    plugins:
      - typescript-validation-schema
    config:
      importFrom: ./graphql # path for generated ts code

Then the generator generates code with import statement like below.

import { GeneratedInput } from './graphql'

/* generates validation schema here */

schemaNamespacedImportName

type: string

If defined, will use named imports from the specified module (defined in importFrom) rather than individual imports for each type.

generates:
  path/to/types.ts:
    plugins:
      - typescript
  path/to/schemas.ts:
    plugins:
      - graphql-codegen-validation-schema
    config:
      schema: yup
      importFrom: ./path/to/types
      schemaNamespacedImportName: types

Then the generator generates code with import statement like below.

import * as types from './graphql'

/* generates validation schema here */

useTypeImports

type: boolean default: false

Will use import type {} rather than import {} when importing generated TypeScript types. This gives compatibility with TypeScript's "importsNotUsedAsValues": "error" option. Should used in conjunction with importFrom option.

typesPrefix

type: string default: (empty)

Prefixes all import types from generated typescript type.

generates:
  path/to/graphql.ts:
    plugins:
      - typescript
  path/to/validation.ts:
    plugins:
      - typescript-validation-schema
    config:
      typesPrefix: I
      importFrom: ./graphql # path for generated ts code

Then the generator generates code with import statement like below.

import { IGeneratedInput } from './graphql'

/* generates validation schema here */

typesSuffix

type: string default: (empty)

Suffixes all import types from generated typescript type.

generates:
  path/to/graphql.ts:
    plugins:
      - typescript
  path/to/validation.ts:
    plugins:
      - typescript-validation-schema
    config:
      typesSuffix: I
      importFrom: ./graphql # path for generated ts code

Then the generator generates code with import statement like below.

import { GeneratedInputI } from './graphql'

/* generates validation schema here */

enumsAsTypes

type: boolean default: false

Generates enum as TypeScript type instead of enum.

notAllowEmptyString

type: boolean default: false

Generates validation string schema as do not allow empty characters by default.

scalarSchemas

type: ScalarSchemas

Extends or overrides validation schema for the built-in scalars and custom GraphQL scalars.

yup schema

config:
  schema: yup
  scalarSchemas:
    Date: yup.date()
    Email: yup.string().email()

zod schema

config:
  schema: zod
  scalarSchemas:
    Date: z.date()
    Email: z.string().email()

zodv4 schema

config:
  schema: zodv4
  scalarSchemas:
    Date: z.date()
    Email: z.string().email()

defaultScalarTypeSchema

type: string

Fallback scalar type for undefined scalar types in the schema not found in scalarSchemas.

yup schema

config:
  schema: yup
  defaultScalarSchema: yup.unknown()

zod schema

config:
  schema: zod
  defaultScalarSchema: z.unknown()

zodv4 schema

config:
  schema: zodv4
  defaultScalarSchema: z.unknown()

withObjectType

type: boolean default: false

Generates validation schema with GraphQL type objects. But excludes Query, Mutation, Subscription objects.

It is currently added for the purpose of using simple objects. See also #20, #107.

This option currently does not support fragment generation. If you are interested, send me PR would be greatly appreciated!

validationSchemaExportType

type: ValidationSchemaExportType default: 'function'

Specify validation schema export type.

useEnumTypeAsDefaultValue

type: boolean default: false

Uses the full path of the enum type as the default value instead of the stringified value.

namingConvention

type: NamingConventionMap default: { enumValues: "change-case-all#pascalCase" }

Uses the full path of the enum type as the default value instead of the stringified value.

Related: https://the-guild.dev/graphql/codegen/docs/config-reference/naming-convention#namingconvention

directives

type: DirectiveConfig

Generates validation schema with more API based on directive schema. For example, yaml config and GraphQL schema is here.

input ExampleInput {
  email: String! @required(msg: "Hello, World!") @constraint(minLength: 50, format: "email")
  message: String! @constraint(startsWith: "Hello")
}

yup schema

generates:
  path/to/graphql.ts:
    plugins:
      - typescript
      - typescript-validation-schema
    config:
      schema: yup
      directives:
        # Write directives like
        #
        # directive:
        #   arg1: schemaApi
        #   arg2: ["schemaApi2", "Hello $1"]
        #
        # See more examples in `./tests/directive.spec.ts`
        # https://github.com/Code-Hex/graphql-codegen-typescript-validation-schema/blob/main/tests/directive.spec.ts
        required:
          msg: required
        constraint:
          minLength: min
          # Replace $1 with specified `startsWith` argument value of the constraint directive
          startsWith: [matches, /^$1/]
          format:
            # This example means `validation-schema: directive-arg`
            # directive-arg is supported String and Enum.
            email: email

Then generates yup validation schema like below.

export function ExampleInputSchema(): yup.SchemaOf<ExampleInput> {
  return yup.object({
    email: yup.string().defined().required('Hello, World!').min(50).email(),
    message: yup.string().defined().matches(/^Hello/)
  })
}

zod schema

generates:
  path/to/graphql.ts:
    plugins:
      - typescript
      - typescript-validation-schema
    config:
      schema: zod
      directives:
        # Write directives like
        #
        # directive:
        #   arg1: schemaApi
        #   arg2: ["schemaApi2", "Hello $1"]
        #
        # See more examples in `./tests/directive.spec.ts`
        # https://github.com/Code-Hex/graphql-codegen-typescript-validation-schema/blob/main/tests/directive.spec.ts
        constraint:
          minLength: min
          # Replace $1 with specified `startsWith` argument value of the constraint directive
          startsWith: [regex, /^$1/, message]
          format:
            # This example means `validation-schema: directive-arg`
            # directive-arg is supported String and Enum.
            email: email

Then generates zod validation schema like below.

export function ExampleInputSchema(): z.ZodSchema<ExampleInput> {
  return z.object({
    email: z.string().min(50).email(),
    message: z.string().regex(/^Hello/, 'message')
  })
}

zodv4 schema

generates:
  path/to/graphql.ts:
    plugins:
      - typescript
      - typescript-validation-schema
    config:
      schema: zodv4
      directives:
        constraint:
          minLength: min
          # Replace $1 with specified `startsWith` argument value of the constraint directive
          startsWith: [regex, /^$1/, message]
          format:
            # This example means `validation-schema: directive-arg`
            # directive-arg is supported String and Enum.
            email: email

Then generates zodv4 validation schema like below.

export function ExampleInputSchema(): z.ZodObject<Properties<ExampleInput>> {
  return z.object({
    email: z.string().min(50).email(),
    message: z.string().regex(/^Hello/, 'message')
  })
}

other schema

Please see example directory.

Notes

Their is currently a compatibility issue with the client-preset. A workaround for this is to split the generation into two (one for client-preset and one for typescript-validation-schema).

generates:
  path/to/graphql.ts:
    plugins:
      - typescript-validation-schema
  /path/to/graphql/:
    preset: 'client',
      plugins:
      ...