Batch coverage report data sent to 'combineCoverage' using number of keys as the batching mechanism. This is to prevent very large objects being sent across processes all at once. Objects of sufficient size have been causing timeouts during this transition.

Author: aantes-st

support.js

@@ -14,12 +14,23 @@ dayjs.extend(duration)
 const sendCoverage = (coverage, pathname = '/') => {
   logMessage(`Saving code coverage for **${pathname}**`)
 
-  const totalCoverage = filterFilesFromCoverage(coverage)
+  let totalCoverage = filterFilesFromCoverage(coverage)
 
-  // stringify coverage object for speed
-  cy.task('combineCoverage', JSON.stringify(totalCoverage), {
-    log: false
-  })
+  const keys = Object.keys(totalCoverage)
+  const batchSize = 500;
+
+  for (let i = 0; i < keys.length; i += batchSize) {
+    const batchKeys = keys.slice(i, i + batchSize)
+    const batchCoverage = {}
+
+    batchKeys.forEach(key => {
+      batchCoverage[key] = totalCoverage[key]
+    })
+
+    cy.task('combineCoverage', JSON.stringify(batchCoverage), {
+      log:false
+    })
+  }
 }
 
 /**