fix(coverage): ignore [email protected]'s generated export statements

Author: AriPerkkio

packages/coverage-v8/package.json

@@ -56,7 +56,7 @@
   "dependencies": {
     "@ampproject/remapping": "catalog:",
     "@bcoe/v8-coverage": "^1.0.2",
-    "ast-v8-to-istanbul": "^0.3.1",
+    "ast-v8-to-istanbul": "https://pkg.pr.new/AriPerkkio/ast-v8-to-istanbul@51",
     "debug": "catalog:",
     "istanbul-lib-coverage": "catalog:",
     "istanbul-lib-report": "catalog:",

packages/coverage-v8/src/provider.ts

@@ -260,7 +260,7 @@ export class V8CoverageProvider extends BaseCoverageProvider<ResolvedCoverageOpt
         coverage: { functions, url: filename },
         ignoreClassMethods: this.options.ignoreClassMethods,
         wrapperLength,
-        ignoreNode: (node, type) => {
+        ignoreNode: (node, type, parent) => {
           // SSR transformed imports
           if (
             type === 'statement'
@@ -272,7 +272,7 @@ export class V8CoverageProvider extends BaseCoverageProvider<ResolvedCoverageOpt
             return true
           }
 
-          // SSR transformed exports
+          // SSR transformed exports vite@>6.3.5
           if (
             type === 'statement'
             && node.type === 'ExpressionStatement'
@@ -283,6 +283,16 @@ export class V8CoverageProvider extends BaseCoverageProvider<ResolvedCoverageOpt
           ) {
             return true
           }
+
+          // SSR transformed exports vite@^6.3.5
+          if (
+            type === 'statement'
+            && parent?.type === 'VariableDeclarator'
+            && parent.id.type === 'Identifier'
+            && parent.id.name === '__vite_ssr_export_default__'
+          ) {
+            return true
+          }
         },
       },
       )

pnpm-lock.yaml

@@ -1,7 +1,7 @@
 import { readdirSync } from 'node:fs'
 import { resolve } from 'node:path'
 import { beforeAll, expect } from 'vitest'
-import { isBrowser, isExperimentalV8Provider, isV8Provider, readCoverageMap, runVitest, test } from '../utils'
+import { isBrowser, isV8Provider, readCoverageMap, runVitest, test } from '../utils'
 
 beforeAll(async () => {
   await runVitest({
@@ -43,16 +43,6 @@ test('coverage results matches snapshot', async () => {
       }
     `)
   }
-  else if (isExperimentalV8Provider()) {
-    expect(coverageMap).toMatchInlineSnapshot(`
-      {
-        "branches": "6/8 (75%)",
-        "functions": "5/7 (71.42%)",
-        "lines": "14/17 (82.35%)",
-        "statements": "15/18 (83.33%)",
-      }
-    `)
-  }
   else {
     expect(coverageMap).toMatchInlineSnapshot(`
       {

test/coverage-test/test/vue.test.ts

@@ -1,5 +1,5 @@
 import { expect } from 'vitest'
-import { isExperimentalV8Provider, isV8Provider, readCoverageMap, runVitest, test } from '../utils'
+import { isV8Provider, readCoverageMap, runVitest, test } from '../utils'
 
 test('{ all: true } includes uncovered files that require custom transform', async () => {
   await runVitest({
@@ -64,42 +64,6 @@ test('{ all: true } includes uncovered files that require custom transform', asy
       }
     `)
   }
-  else if (isExperimentalV8Provider()) {
-    expect(fileCoverages).toMatchInlineSnapshot(`
-      {
-        "<process-cwd>/fixtures/src/covered.custom-1": {
-          "branches": "0/0 (100%)",
-          "functions": "1/2 (50%)",
-          "lines": "2/3 (66.66%)",
-          "statements": "2/3 (66.66%)",
-        },
-        "<process-cwd>/fixtures/src/math.ts": {
-          "branches": "0/0 (100%)",
-          "functions": "1/4 (25%)",
-          "lines": "1/4 (25%)",
-          "statements": "1/4 (25%)",
-        },
-        "<process-cwd>/fixtures/src/uncovered.custom-1": {
-          "branches": "0/0 (100%)",
-          "functions": "0/1 (0%)",
-          "lines": "0/2 (0%)",
-          "statements": "0/2 (0%)",
-        },
-        "<process-cwd>/fixtures/workspaces/custom-2/src/covered.custom-2": {
-          "branches": "0/0 (100%)",
-          "functions": "1/2 (50%)",
-          "lines": "2/3 (66.66%)",
-          "statements": "2/3 (66.66%)",
-        },
-        "<process-cwd>/fixtures/workspaces/custom-2/src/uncovered.custom-2": {
-          "branches": "0/0 (100%)",
-          "functions": "0/1 (0%)",
-          "lines": "0/2 (0%)",
-          "statements": "0/2 (0%)",
-        },
-      }
-    `)
-  }
   else {
     expect(fileCoverages).toMatchInlineSnapshot(`
       {