Lost Pixel
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Modes

Lost Pixel is able to run in different modes to base your visual regression tests on one of the currently available options:
  • Storybook
  • Ladle
  • Page shots
  • Custom shots

Storybook

lost-pixel.config.ts
import { CustomProjectConfig } from 'lost-pixel';
​
export const config: CustomProjectConfig = {
storybookShots: {
storybookUrl: './storybook-static',
},
// OSS mode
generateOnly: true,
failOnDifference: true
// Lost Pixel Platform (to use in Platform mode, comment out the OSS mode and uncomment this part )
// lostPixelProjectId: "xxxx",
// process.env.LOST_PIXEL_API_KEY,
};

Ladle

lost-pixel.config.ts
import { CustomProjectConfig } from 'lost-pixel';
​
export const config: CustomProjectConfig = {
ladleShots: {
// IP should be localhost when running locally & 172.17.0.1 when running in GitHub action
baseUrl: 'http://172.17.0.1:61000',
},
// OSS mode
generateOnly: true,
failOnDifference: true
// Lost Pixel Platform (to use in Platform mode, comment out the OSS mode and uncomment this part )
// lostPixelProjectId: "xxxx",
// process.env.LOST_PIXEL_API_KEY,
};

Page shots

Page screenshots presume any frontend application that can run in the browser. This example uses Next.js
lost-pixel.config.ts
import { CustomProjectConfig } from 'lost-pixel';
​
export const config: CustomProjectConfig = {
pageShots: {
pages: [
{ path: '/app', name: 'app' },
{ path: '/next-app', name: 'next-app' },
{ path: '/next-app?name=App', name: 'next-app-with-query-param' },
{ path: '/fetch', name: 'fetch-static-props' },
{ path: '/client-fetch', name: 'fetch-client' },
],
// IP should be localhost when running locally & 172.17.0.1 when running in GitHub action
​
baseUrl: 'http://localhost:3000',
},
// OSS mode
generateOnly: true,
failOnDifference: true
// Lost Pixel Platform (to use in Platform mode, comment out the OSS mode and uncomment this part )
// lostPixelProjectId: "xxxx",
// process.env.LOST_PIXEL_API_KEY,
};

Custom shots

Custom screenshots presume that you take the screenshots on your side & Lost Pixel Platform runs them for Visual Regression tests. In this example, you can use Cypress or Playwright to make the screenshots during the tests and forward them to the lost-pixel folder.
lost-pixel.config.ts
import { CustomProjectConfig } from 'lost-pixel';
​
export const config: CustomProjectConfig = {
customShots: {
currentShotsPath: "./lost-pixel",
},
// OSS mode
generateOnly: true,
failOnDifference: true
// Lost Pixel Platform (to use in Platform mode, comment out the OSS mode and uncomment this part )
// lostPixelProjectId: "xxxx",
// process.env.LOST_PIXEL_API_KEY,
};

Holistic Visual Regression Testing mode

Lost Pixel supports simultaneously using several modes to achieve visual regression testing needs. In the following example, we presume that your app packages some components you want to test with Ladle & some full-page screenshots that incorporate those components.
lost-pixel.config.ts
import { CustomProjectConfig } from 'lost-pixel';
​
export const config: CustomProjectConfig = {
pageShots: {
pages: [
{ path: '/app', name: 'app' },
{ path: '/next-app', name: 'next-app' },
],
// IP should be localhost when running locally & 172.17.0.1 when running in GitHub action
baseUrl: 'http://172.17.0.1:3000',
​
},
ladleShots: {
// IP should be localhost when running locally & 172.17.0.1 when running in GitHub action
ladleUrl: 'http://172.17.0.1:61000',
},
// OSS mode
generateOnly: true,
failOnDifference: true
// Lost Pixel Platform (to use in Platform mode, comment out the OSS mode and uncomment this part )
// lostPixelProjectId: "xxxx",
// process.env.LOST_PIXEL_API_KEY,
};