Added support for capturing asset in multiple dpr and width combination

packages/cli-snapshot/src/snapshot.js

@@ -48,7 +48,8 @@ export const snapshot = command('snapshot', {
   ],
 
   percy: {
-    delayUploads: true
+    delayUploads: true,
+    projectType: 'web'
   },
 
   config: {

packages/client/src/client.js

@@ -217,6 +217,18 @@ export class PercyClient {
     return this.get(`job_status?sync=true&type=${type}&id=${ids.join()}`);
   }
 
+  // Returns device details enabled on project associated with given token
+  async getDeviceDetails(buildId) {
+    try {
+      let url = 'discovery/device-details';
+      if (buildId) url += `?build_id=${buildId}`;
+      const { data } = await this.get(url);
+      return data;
+    } catch (e) {
+      return [];
+    }
+  }
+
   // Retrieves project builds optionally filtered. Requires a read access token.
   async getBuilds(project, filters = {}) {
     validateProjectPath(project);

packages/client/test/client.test.js

@@ -353,6 +353,20 @@ describe('PercyClient', () => {
     });
   });
 
+  describe('#getDeviceDetails()', () => {
+    it('in case of error return []', async () => {
+      api.reply('/discovery/device-details', () => [500]);
+      await expectAsync(client.getDeviceDetails()).toBeResolvedTo([]);
+    });
+
+    it('gets device details', async () => {
+      api.reply('/discovery/device-details', () => [200, { data: ['<<device-data-without-build-id>>'] }]);
+      api.reply('/discovery/device-details?build_id=123', () => [200, { data: ['<<device-data-with-build-id>>'] }]);
+      await expectAsync(client.getDeviceDetails()).toBeResolvedTo(['<<device-data-without-build-id>>']);
+      await expectAsync(client.getDeviceDetails(123)).toBeResolvedTo(['<<device-data-with-build-id>>']);
+    });
+  });
+
   describe('#getBuilds()', () => {
     it('throws when missing a project path', async () => {
       await expectAsync(client.getBuilds())

packages/client/test/helpers.js

@@ -139,6 +139,12 @@ export const api = {
     '/snapshots/4567?sync=true&response_format=sync-cli': () => [201, {
       name: 'test snapshot',
       diff_ratio: 0
+    }],
+    '/discovery/device-details?build_id=123': () => [201, {
+      data: []
+    }],
+    '/discovery/device-details': () => [201, {
+      data: []
     }]
   },
 

packages/core/src/discovery.js

@@ -141,8 +141,9 @@ function processSnapshotResources({ domSnapshot, resources, ...snapshot }) {
 // Triggers the capture of resource requests for a page by iterating over snapshot widths to resize
 // the page and calling any provided execute options.
 async function* captureSnapshotResources(page, snapshot, options) {
+  const log = logger('core:discovery');
   let { discovery, additionalSnapshots = [], ...baseSnapshot } = snapshot;
-  let { capture, captureWidths, deviceScaleFactor, mobile } = options;
+  let { capture, captureWidths, deviceScaleFactor, mobile, captureForDevices } = options;
 
   // used to take snapshots and remove any discovered root resource
   let takeSnapshot = async (options, width) => {
@@ -187,6 +188,18 @@ async function* captureSnapshotResources(page, snapshot, options) {
     let { widths, execute } = snap;
     let [width] = widths;
 
+    // iterate over device to trigger reqeusts and capture other dpr width
+    if (captureForDevices) {
+      for (const device of captureForDevices) {
+        yield waitForDiscoveryNetworkIdle(page, discovery);
+        // We are not adding these widths and pixels ratios in loop below because we want to explicitly reload the page after resize which we dont do below
+        yield* captureSnapshotResources(page, { ...snapshot, widths: [device.width] }, {
+          deviceScaleFactor: device.deviceScaleFactor,
+          mobile: true
+        });
+      }
+    }
+
     // iterate over widths to trigger reqeusts and capture other widths
     if (isBaseSnapshot || captureWidths) {
       for (let i = 0; i < widths.length - 1; i++) {
@@ -212,13 +225,8 @@ async function* captureSnapshotResources(page, snapshot, options) {
   }
 
   // recursively trigger resource requests for any alternate device pixel ratio
-  if (deviceScaleFactor !== discovery.devicePixelRatio) {
-    yield waitForDiscoveryNetworkIdle(page, discovery);
-
-    yield* captureSnapshotResources(page, snapshot, {
-      deviceScaleFactor: discovery.devicePixelRatio,
-      mobile: true
-    });
+  if (discovery.devicePixelRatio) {
+    log.deprecated('discovery.devicePixelRatio is deprecated percy will now auto capture resource in all devicePixelRatio, Ignoring configuration');
   }
 
   // wait for final network idle when not capturing DOM
@@ -317,7 +325,8 @@ export function createDiscoveryQueue(percy) {
       try {
         yield* captureSnapshotResources(page, snapshot, {
           captureWidths: !snapshot.domSnapshot && percy.deferUploads,
-          capture: callback
+          capture: callback,
+          captureForDevices: percy.deviceDetails || []
         });
       } finally {
         // always close the page when done

packages/core/src/percy.js

@@ -157,6 +157,7 @@ export class Percy {
       if (!this.skipDiscovery) yield this.#discovery.start();
       // start a local API server for SDK communication
       if (this.server) yield this.server.listen();
+      if (this.projectType === 'web') this.deviceDetails = yield this.client.getDeviceDetails(this.build?.id);
       const snapshotType = this.projectType === 'web' ? 'snapshot' : 'comparison';
       this.syncQueue = new WaitForJob(snapshotType, this);
       // log and mark this instance as started