graphql

This documentation cover methods GraphQL-related APIs exposed by `@front-commerce/core`.

createGraphQLModule

Create a GraphQL module.

Parameters

Name	Type	Description
namespace	string	The namespace of the GraphQL module
dependencies	string[]	The dependencies of the GraphQL module
loadRuntime	function	The import that will load GraphQL runtime
typeDefs	string	The GraphQL custom type definitions
schemaDirectives	object	The GraphQL custom directives

Example

import { createGraphQLModule } from "@front-commerce/core/graphql";
import fooDirective from "./directives/fooDirective";

export default createGraphQLModule({
  namespace: "MyModule",
  dependencies: ["Front-Commerce/Payment"],
  loadRuntime: () => import("./runtime"),
  typeDefs: /* GraphQL */ `
    extend type Query {
      getFoo: Foo
    }
    type Foo {
      id: ID!
      bar: Int
    }
  `,
  schemaDirectives: {
    fooDirective,
  },
});

createGraphQLRuntime

Create a GraphQL runtime.

Parameters

Name	Type	Description
resolvers	object	GraphQL resolvers
contextEnhancer	function(context)	function to enhance the GraphQL context

contextEnhancer function

The context enhancer function recieves the following arguments

Argument	Type	Description
config	Config	The application configuration
user	User	The actual user session
services	Service	The registered services
loader	Loader	Loaders registred in your application

Example

import { createGraphQLRuntime } from "@front-commerce/core/graphql";
import createFooContextEnhancer from "./createFooContextEnhancer";
import resolvers from "./resolvers";

export default createGraphQLRuntime({
  resolvers: {
    Query: {
      getFoo: (_, __, { loaders }) => loaders.Foo.getFoo(),
    },
  },
  contextEnhancer: ({ config, user, services, loader }) => {
    return {
      Foo: createFooContextEnhancer(config, user, services, loader),
    };
  },
});

createGraphQLApi

Creates a GraphQL method to executes GraphQL queries and mutations.

import { createGraphQLApi } from "@front-commerce/core/graphql";
import { AcmeQuery } from "~/graphql/graphql";

const AcmeGraphQLApi = createGraphQLApi(request, user, config);

const response = await AcmeGraphQLApi(AcmeQuery);

Arguments:

Argument	Type	Description
request	Request	The request object
user	User	The user context
config	Config	The application configuration

makeErrorLoggerInterceptor

Intercepts and log errors.

import { makeErrorLoggerInterceptor } from "@front-commerce/core/graphql";

const errorLoggerInterceptor = makeErrorLoggerInterceptor({
  isMaintenance: (error) =>
    error.response &&
    (error.response.status === 503 ||
      (error.response.status === 500 &&
        /maintenance mode .* enabled/.test(error.response.data))),
  ignoreForbiddenErrors: ignoreForbiddenErrors,
});

Arguments:

Argument	Type	Description
isMaintenance	function	a function that recieve error as parameter and return a boolean to tell if website is in maintenance mode
ignoreForbiddenErrors	boolean	a boolean to tell if forbidden errors
should be ignored

reorderForIds

Reorders an array by ids.

import { reorderForIds } from "@front-commerce/core/graphql";

const orderer = reorderForIds([2, 3, 1], "id");
const reordered = orderer([{ id: 1 }, { id: 2 }, { id: 3 }]);

Arguments:

Argument	Type	Description
ids	string[]	ids to reorder
key	string	key used to order

reorderForIdsCaseInsensitive

Same as reorderForIds but case insensitive.

makeBatchLoaderFromSingleFetch

Converts a single fetch to a batch loader.

import { makeBatchLoaderFromSingleFetch } from "@front-commerce/core/graphql";

const axiosInstance = axios.create({
  baseURL: "https://acme.com/api",
});

const acmeLoader = makeBatchLoaderFromSingleFetch(
  (depth) => axiosInstance.get(`/prodcuts`),
  (response) => response.data.products
);

Arguments:

Argument	Type	Description
fetch	function	fetch function
response	object	response transformer

maybeValue

Checks if a value is defined, else prints an axios debug message and returns null

import { maybeValue } from "@front-commerce/core/graphql";

const acmeValue = maybeValue(5, "value is not defined");

Arguments:

Argument	Type	Description
value	any	value to check
noValueDebugMessage	string	debug message

promiseToMutationSuccess

Converts a promise to a mutation success object with a success entry to know if the mutation was successful and a data entry that contains returned datas.

import { promiseToMutationSuccesData } from "@front-commerce/core/graphql";

const result = await promiseToMutationSuccesData(
  axios.get("https://acme.com/api/products")
);

Arguments:

Argument	Type	Description
promise	Promise	promise to execute

Returns:

Property	Type	Description
success	boolean	mutation success
data	any	data returned

promiseToMutationSuccessWithData

Converts a promise to a mutation success object with a success entry to know if the mutation was successful and a data entry that contains returned transformed by data transformer.

import { promiseToMutationSuccesWithData } from "@front-commerce/core/graphql";

const result = await promiseToMutationSuccesWithData(
  axios.get("https://acme.com/api/products"),
  (data) => ({
    id: product.id,
  })
);

Arguments:

Argument	Type	Description
promise	Promise	promise to evaluate
transform	function	transformation function

Returns an object

Property	Type	Description
success	boolean	mutation success
data	any	data returned

withDefault404Result

Resolves a promise with defaultResult if the promise is rejected with a 404 code.

tip

This is mainly used for axios requests that throw an object with a response.status property. If you want to use it with a promise that doest not come from an axios request, your promise reject object must include a response.status property.

import { withDefault404Result } from "@front-commerce/core/graphql";

const result = await withDefault404Result(
  axios.get("https://acme.com/api/products"),
  []
);

Arguments:

Argument	Type	Description
promise	Promise	promise to evaluate
defaultResult	any	default result to return if the promise is rejected with a 404 code

RestPagesWalker

Retrieves all items from a paginated API.

import axios from "axios";
import { RestPagesWalker } from "@front-commerce/core/graphql";

const axiosInstance = axios.create({
  baseURL: "https://acme.com/api",
});

const walker = RestPagesWalker(
  axiosInstance,
  {
    url: "/products",
    defaultParams: {
      color: "blue",
      size: "small",
    },
    pageParamName: "currentPage",
    pageSizeParamName: "pageSize",
    responseDataKey: "products",
  },
  (product) => product.id
);

const allData = await walker.walk();

Arguments:

Argument	Type	Description
axiosInstance	axios	The axios instance to use
url	string	The API's url
defaultParams	object	The search params to use for request
pageParamName	string	The name of the search param that contains the page
pageSizeParamName	string	The name of the search param that contains the page size
responseDataKey	string	The response key that contains data
formatItem	function	The function to format each item

makePolymorphicGraphQLTypeLoader

Creates a GraphQL Type Loader that accept multiple types.

import { makePolymorphicGraphQLTypeLoader } from "@front-commerce/core/graphql";

const loader = makePolymorphicGraphQLTypeLoader({
  name: "AcmeProduct",
  defaultTypename: "NotFound",
});

Arguments:

Argument	Type	Description
name	string	The name of the type
defaultTypename	string	The default typename

makePriceValue

Takes amount, currency and includeTax to create a GraphQL compatible Price type

import { makePriceValue } from "@front-commerce/core/graphql";

const priceValue = makePriceValue(100, "USD", false);

Arguments:

Argument	Type	Description
amount	number	The price's amount.
currency	string	The price's currency
includeTax	boolean	Does the price include tax

limitRateByGraphQLResolver

Wraps a resolver with the rate limiting service.

import { limitRateByGraphQLResolver } from "@front-commerce/core/graphql";

export default {
  Query: {
    helloWorld: limitRateByGraphQLResolver(options, resolver),
  },
};

Arguments:

Argument	Type	Description
options.max	number	The max request for duration
options.duration	StringValue	The duration of the rate limiting
resolver	FieldResolver	The resolver function