@evo/apollo-typed-documents
v1.0.0
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Get type safety for your apollo documents.
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apollo-typed-documents
Provides graphql-codegen plugins (https://graphql-code-generator.com/) for type safe GraphQL documents (DocumentNode
).
It allows functions to accept a generic TypedDocumentNode<TVariables, TData>
so that types of other arguments or the return type can be inferred.
It is helpful for TypeScript projects but also if used only within an IDE, e.g. it works extremely well with VSCode (uses TypeScript behind the scenes).
$ yarn add apollo-typed-documents
codegenTypedDocuments
Generates TypeScript typings for .graphql
files.
Similar to @graphql-codegen/typescript-graphql-files-modules
(https://graphql-code-generator.com/docs/plugins/typescript-graphql-files-modules).
The difference is that is uses generic types, so that you have type safety with Apollo (e.g. useQuery
/ useMutation
).
The apollo-typed-documents
plugin also accepts the same modulePathPrefix
, relativeToCwd
and prefix
config settings as typescript-graphql-files-modules.
Install
$ yarn add @graphql-codegen/add @graphql-codegen/typescript @graphql-codegen/typescript-operations
$ yarn add apollo-typed-documents
codegen.yml
:
schema: schema.graphql
documents: src/**/*.graphql
config:
scalars:
Date: string
generates:
./src/codegenTypedDocuments.d.ts:
plugins:
- apollo-typed-documents/lib/codegenTypedDocuments
config:
typesModule: "@codegen-types"
./src/codegenTypes.d.ts:
plugins:
- add:
placement: prepend
content: 'declare module "@codegen-types" {'
- add:
placement: append
content: "}"
- typescript
- typescript-operations
tsconfig.json
:
Add node_modules/apollo-typed-documents/lib/reactHooks.d.ts
in include
to override the typings for hooks of @apollo/client
, so that types can be inferred from typed documents.
{
"compilerOptions": {
"noEmit": true,
"allowJs": true,
"checkJs": true,
"strict": true,
"jsx": "react",
"esModuleInterop": true
},
"include": ["src", "node_modules/apollo-typed-documents/lib/reactHooks.d.ts"]
}
Config
typesModule: string - Import location for types generated by typescript operations plugin.
relativeToCwd?: boolean (false) - By default, only the filename is used to generate TS module declarations. Setting this to `true` will generate it with a full path based on the CWD.
prefix?: string - By default all module paths will be prefixed with "*\/". Override this to remove or specify a custom prefix (helpful to set to "" in conjunction relativeToCwd.)
stripPrefix?: string - Used in conjunction with relativeToCwd if if imports should be relative to some subdirectory within the cwd, e.g. "src".
typedDocumentNodeModule?: string -Import location for TypedDocumentNode. By default "@graphql-typed-document-node/core"
excludeDefaultExports?: boolean - Exclude default exports from modules.
operationResultSuffix?: string - Add suffix to generated operation result type names e.g we have operation name Author and suffix QueryType, we will get AuthorQueryType
useOperationNameAsSuffix?: boolean - use operation name as suffix e.g we have operation query Author, we will get AuthorQuery e.g we have operation mutation Author we will get AuthorMutation
Example
src/authors.graphql
:
query authors {
authors {
id
createdAt
name
description
books {
id
title
}
}
}
src/createAuthor.graphql
:
mutation createAuthor($input: AuthorInput!) {
createAuthor(input: $input) {
id
createdAt
name
description
books {
id
title
}
}
}
src/codegenTypedDocuments.d.ts
(generated):
declare module "*/authors.graphql" {
import { TypedDocumentNode } from "apollo-typed-documents";
import { AuthorsQuery, AuthorsQueryVariables } from "@codegen-types";
export const authors: TypedDocumentNode<AuthorsQueryVariables, AuthorsQuery>;
export default authors;
}
declare module "*/createAuthor.graphql" {
import { TypedDocumentNode } from "apollo-typed-documents";
import { CreateAuthorMutation, CreateAuthorMutationVariables } from "@codegen-types";
export const createAuthor: TypedDocumentNode<CreateAuthorMutationVariables, CreateAuthorMutation>;
export default createAuthor;
}
src/AuthorList.js
:
import { useMutation, useQuery } from "@apollo/client";
import React from "react";
import authorsQuery from "./authors.graphql";
import createAuthorMutation from "./createAuthor.graphql";
const AuthorList = () => {
// Type of `data` is inferred (AuthorsQuery)
const { data } = useQuery(authorsQuery);
const [createAuthor] = useMutation(createAuthorMutation);
return (
<>
<ul>
{data?.authors.map((author) => (
<li key={author.id}>{author.name}</li>
))}
</ul>
<button
onClick={() => {
createAuthor({
// Type of variables is inferred (CreateAuthorMutationVariables)
variables: { input: { name: "Foo", books: [{ title: "Bar" }] } },
});
}}
>
Add
</button>
</>
);
};
export default AuthorList;
Notes for create-react-app
users
create-react-app
supports graphql.macro
for loading .graphql
files (https://create-react-app.dev/docs/loading-graphql-files/).
The codegenTypedDocuments
plugin generates ambient module declarations for .graphql
files, which means that .graphql
files must be imported as regular modules (import
syntax) so that TypeScript knows about the types.
You can use the babel plugin babel-plugin-import-graphql
(https://github.com/detrohutt/babel-plugin-import-graphql), but then you need to use react-app-rewired
(https://github.com/timarney/react-app-rewired/) and customize-cra
(https://github.com/arackaf/customize-cra) so that you can define custom babel plugins.
$ yarn add react-app-rewired customize-cra
$ yarn add babel-plugin-import-graphql
config-overrides.js
const { override, useBabelRc } = require("customize-cra");
module.exports = override(useBabelRc());
.babelrc
{
"presets": ["react-app"],
"plugins": ["babel-plugin-import-graphql"]
}
package.json
"scripts": {
"start": "react-app-rewired start",
"build": "react-app-rewired build",
"test": "react-app-rewired test",
...
}
If you have a TypeScript app, you need to override the @apollo/client
types for hooks in tsconfig.json
:
tsconfig.json
{
"compilerOptions": {
...
},
"include": ["src", "node_modules/apollo-typed-documents/lib/reactHooks.d.ts"]
}
If you don't have a TypeScript app (you just want TypeScript support within your IDE) you can't create a tsconfig.json
in your app folder, because create-react-app
uses that file to detect if this is a TypeScript project.
Instead, you have to create the tsconfig.json
in your src
folder:
src/tsconfig.json
{
"compilerOptions": {
"noEmit": true,
"allowJs": true,
"checkJs": true,
"strict": true,
"jsx": "react",
"esModuleInterop": true
},
"include": [".", "../node_modules/apollo-typed-documents/lib/reactHooks.d.ts"]
}
Please see the following example projects for more details:
codegenApolloMock
Creates a helper method to easily create mocks for Apollo MockedProvider
(https://www.apollographql.com/docs/react/api/react-testing/#mockedprovider).
The returned object is guaranteed to conform to the GraphQL Schema of the query / mutation: reference.
For required (non-null) fields which are not provided (in data / variables), it will use a default value (e.g. "Author-id"
).
For optional fields which are not provided (in data / variables), it will use undefined
for variables and null
for data.
Works for any nested selections (data) and any nested inputs (variables).
It will include __typename
in data by default. This can be deactivated as an option:
apolloMock(documentNode, variables, result, { addTypename: false });
When used together with codegenTypedDocuments
the data and variables are type checked (type inference).
To mock errors, you can provide errors
in result
(GraphQLError
) or pass an Error
instead of result
:
apolloMock(documentNode, variables, { errors: [new GraphQLError("Already exists")] });
apolloMock(documentNode, variables, new Error("Network error"));
Install
$ yarn add apollo-typed-documents
codegen.yml
schema: schema.graphql
documents: src/**/*.graphql
config:
scalars:
Date: string
generates:
./src/apolloMock.js:
plugins:
- apollo-typed-documents/lib/codegenApolloMock
Example
schema.graphql
:
scalar Date
type Author {
id: ID!
createdAt: Date!
name: String!
description: String
books: [Book!]!
}
type Book {
id: ID!
title: String!
}
input AuthorInput {
name: String!
description: String
books: [BookInput!]!
}
input BookInput {
title: String!
}
type Query {
authors: [Author!]!
}
type Mutation {
createAuthor(input: AuthorInput!): Author!
}
schema {
query: Query
mutation: Mutation
}
src/authors.graphql
:
query authors {
authors {
id
createdAt
name
description
books {
id
title
}
}
}
src/createAuthor.graphql
:
mutation createAuthor($input: AuthorInput!) {
createAuthor(input: $input) {
id
createdAt
name
description
books {
id
title
}
}
}
src/apolloMock.js
(generated):
See: reference
src/apolloMock.test.js
:
import { GraphQLError } from "graphql";
import apolloMock from "./apolloMock";
import authors from "./authors.graphql";
import createAuthor from "./createAuthor.graphql";
describe("apolloMock", () => {
it("produces the minimal output that is valid according to graphql schema", () => {
expect(apolloMock(authors, {}, {})).toEqual({
request: {
query: authors,
variables: {},
},
result: {
data: {
authors: [],
},
},
});
expect(apolloMock(authors, {}, { data: { authors: [{}] } })).toEqual({
request: {
query: authors,
variables: {},
},
result: {
data: {
authors: [
{
__typename: "Author",
id: "Author-id",
createdAt: "Author-createdAt",
name: "Author-name",
description: null,
books: [],
},
],
},
},
});
expect(
apolloMock(
createAuthor,
{ input: { name: "Foo", books: [{ title: "Bar" }] } },
{ data: { createAuthor: { name: "Foo", books: [{ title: "Bar" }] } } }
)
).toEqual({
request: {
query: createAuthor,
variables: {
input: {
name: "Foo",
description: undefined,
books: [{ title: "Bar" }],
},
},
},
result: {
data: {
createAuthor: {
__typename: "Author",
id: "Author-id",
createdAt: "Author-createdAt",
name: "Foo",
description: null,
books: [
{
__typename: "Book",
id: "Book-id",
title: "Bar",
},
],
},
},
},
});
});
it("allows overriding default values for scalar types", () => {
const scalarValues = { Date: "2020-01-01" };
expect(
apolloMock(authors, {}, { data: { authors: [{}] } }, { scalarValues })
).toEqual({
request: {
query: authors,
variables: {},
},
result: {
data: {
authors: [
{
__typename: "Author",
id: "Author-id",
createdAt: "2020-01-01",
name: "Author-name",
description: null,
books: [],
},
],
},
},
});
});
it("supports errors", () => {
expect(
apolloMock(authors, {}, { errors: [new GraphQLError("Already exists")] })
).toEqual({
request: {
query: authors,
variables: {},
},
result: {
errors: [new GraphQLError("Already exists")],
},
});
expect(apolloMock(authors, {}, new Error("Network error"))).toEqual({
request: {
query: authors,
variables: {},
},
error: new Error("Network error"),
});
});
});