I am writing a front end with React/JavaScript. I heard GraphQL and I do like it. I want to replace the REST API.
But I do not want to build the back end before I finish my front end, that mean I need a fake API. So there are two ways for me:
- Build a server that can deal with the request and return the fake response.
- Or we can... yes, mock those function.
IF YOU HAVE GOOD IDEA, FEEL FREE TO TELL ME PLEASE: peterlitszo at gmail, I WILL CHANGE/UPDATE IT SOON!
First Part - Build a server.
This post have a easy setup that build a fake server:
https://dev.to/ekafyi/serving-nothing-through-graphql-58cc
Apollo is a package to build a GraphQL client, here is the document to build mock server:
https://www.apollographql.com/docs/apollo-server/testing/mocking/
But I do not want to build this. The reason is easy: In computer the port can only hold by one process. That mean I need to hold two process (the first is the React development (with HMR) process, the second is the server process), and I need to change the variable by the environment (dev or release).
Second Part - Mock.
This is the way I am using. I am using msw now.
In the main javascript file, I add this part, so the msw will get the request in browser and then return the fake data, which defined in file ./src/mock/browser.js:
// ./src/index.jsx
if (process.env.NODE_ENV === 'development') {
const { worker } = await import('./mock/browser');
worker.start();
console.log('Add mock...');
}
Now it is time to create file ./src/mock/browser.js:
// ./src/mock/browser.js
import { setupWorker, graphql } from 'msw';
import { filter, isUndefined } from 'lodash';
import { faker } from '@faker-js/faker';
// The news' data.
const new_data = {
news: [
{
id: 1,
title: 'First',
image_uri: faker.image.abstract(undefined, undefined, true),
content: 'First '.repeat(1000),
summary: 'A lot of word `First`',
},
{
id: 2,
title: 'Second',
image_uri: faker.image.abstract(undefined, undefined, true),
content: 'Second '.repeat(1000),
summary: 'A lot of word `Second`',
},
{
id: 3,
title: 'White',
image_uri: faker.image.abstract(undefined, undefined, true),
content: 'White '.repeat(1000),
summary: 'Just white',
},
{
id: 4,
title: 'Random',
image_uri: faker.image.abstract(undefined, undefined, true),
content: faker.lorem.paragraphs(100, '\n\n'), // markdown
summary: 'Hello',
},
],
};
// Mock the query named News
const News = graphql.query('News', (req, res, ctx) => {
const { newsId } = req.variables;
const news = isUndefined(newsId)
? news_data.news
: filter(news_data.news, (new_) => parseInt(newsId) === new_.id);
return res(ctx.data({ news }));
});
// The log's data.
const log_data = {
users: [
{
id: 1,
name: 'Peter',
emails: ['peterlitszo at gmail.com'],
password: 'admin123',
isAdmin: true,
},
],
};
// Mock the query named Log.
const Log = graphql.query('Log', (req, res, ctx) => {
const { email } = req.variables;
return res(
ctx.data({
...filter(log_data.users, (o) => o.emails.includes(email)),
}),
);
});
// build and export the worker.
const handlers = [News, Log];
export const worker = setupWorker(...handlers);
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