fix(coverage): all missing untested files in edge cases

packages/coverage-istanbul/src/provider.ts

@@ -260,20 +260,16 @@ export class IstanbulCoverageProvider extends BaseCoverageProvider implements Co
       .map(file => resolve(this.ctx.config.root, file))
       .filter(file => !coveredFiles.includes(file))
 
+    const cacheKey = new Date().getTime()
     const coverageMap = libCoverage.createCoverageMap({})
 
     // Note that these cannot be run parallel as synchronous instrumenter.lastFileCoverage
     // returns the coverage of the last transformed file
     for (const [index, filename] of uncoveredFiles.entries()) {
       debug('Uncovered file %s %d/%d', filename, index, uncoveredFiles.length)
 
-      // Make sure file is not served from cache
-      // so that instrumenter loads up requested file coverage
-      if (this.ctx.vitenode.fetchCache.has(filename))
-        this.ctx.vitenode.fetchCache.delete(filename)
-
-      await this.ctx.vitenode.transformRequest(filename)
-
+      // Make sure file is not served from cache so that instrumenter loads up requested file coverage
+      await this.ctx.vitenode.transformRequest(`${filename}?v=${cacheKey}`)
       const lastCoverage = this.instrumenter.lastFileCoverage()
       coverageMap.addFileCoverage(lastCoverage)
     }