fix(coverage): istanbul provider to work with JSDOM and process.env usage

test/coverage-test/coverage-report-tests/__snapshots__/custom.report.test.ts.snap

@@ -23,6 +23,7 @@ exports[`custom json report 1`] = `
     "<process-cwd>/src/importEnv.ts",
     "<process-cwd>/src/index.mts",
     "<process-cwd>/src/multi-suite.ts",
+    "<process-cwd>/src/process-env.ts",
     "<process-cwd>/src/utils.ts",
   ],
 }

test/coverage-test/coverage-report-tests/__snapshots__/istanbul.report.test.ts.snap

@@ -1425,6 +1425,54 @@ exports[`istanbul json report 1`] = `
       },
     },
   },
+  "<process-cwd>/src/process-env.ts": {
+    "b": {},
+    "branchMap": {},
+    "f": {
+      "0": 1,
+    },
+    "fnMap": {
+      "0": {
+        "decl": {
+          "end": {
+            "column": 29,
+            "line": 1,
+          },
+          "start": {
+            "column": 16,
+            "line": 1,
+          },
+        },
+        "loc": {
+          "end": {
+            "column": null,
+            "line": 3,
+          },
+          "start": {
+            "column": 29,
+            "line": 1,
+          },
+        },
+        "name": "getNodeEnv",
+      },
+    },
+    "path": "<process-cwd>/src/process-env.ts",
+    "s": {
+      "0": 1,
+    },
+    "statementMap": {
+      "0": {
+        "end": {
+          "column": null,
+          "line": 2,
+        },
+        "start": {
+          "column": 2,
+          "line": 2,
+        },
+      },
+    },
+  },
   "<process-cwd>/src/untested-file.ts": {
     "b": {
       "0": [

test/coverage-test/coverage-report-tests/__snapshots__/v8.report.test.ts.snap

@@ -3528,6 +3528,109 @@ exports[`v8 json report 1`] = `
       },
     },
   },
+  "<process-cwd>/src/process-env.ts": {
+    "all": false,
+    "b": {
+      "0": [
+        1,
+      ],
+    },
+    "branchMap": {
+      "0": {
+        "line": 1,
+        "loc": {
+          "end": {
+            "column": 1,
+            "line": 3,
+          },
+          "start": {
+            "column": 7,
+            "line": 1,
+          },
+        },
+        "locations": [
+          {
+            "end": {
+              "column": 1,
+              "line": 3,
+            },
+            "start": {
+              "column": 7,
+              "line": 1,
+            },
+          },
+        ],
+        "type": "branch",
+      },
+    },
+    "f": {
+      "0": 1,
+    },
+    "fnMap": {
+      "0": {
+        "decl": {
+          "end": {
+            "column": 1,
+            "line": 3,
+          },
+          "start": {
+            "column": 7,
+            "line": 1,
+          },
+        },
+        "line": 1,
+        "loc": {
+          "end": {
+            "column": 1,
+            "line": 3,
+          },
+          "start": {
+            "column": 7,
+            "line": 1,
+          },
+        },
+        "name": "getNodeEnv",
+      },
+    },
+    "path": "<process-cwd>/src/process-env.ts",
+    "s": {
+      "0": 1,
+      "1": 1,
+      "2": 1,
+    },
+    "statementMap": {
+      "0": {
+        "end": {
+          "column": 30,
+          "line": 1,
+        },
+        "start": {
+          "column": 0,
+          "line": 1,
+        },
+      },
+      "1": {
+        "end": {
+          "column": 29,
+          "line": 2,
+        },
+        "start": {
+          "column": 0,
+          "line": 2,
+        },
+      },
+      "2": {
+        "end": {
+          "column": 1,
+          "line": 3,
+        },
+        "start": {
+          "column": 0,
+          "line": 3,
+        },
+      },
+    },
+  },
   "<process-cwd>/src/untested-file.ts": {
     "all": true,
     "b": {

test/coverage-test/coverage-report-tests/istanbul.report.test.ts

@@ -2,6 +2,8 @@
  * Istanbul coverage provider specific test cases
  */
 
+import { resolve } from 'node:path'
+import { readFileSync } from 'node:fs'
 import { expect, test } from 'vitest'
 import { readCoverageJson } from './utils'
 
@@ -50,3 +52,11 @@ test('tests with multiple suites are covered', async () => {
     1: 1,
   })
 })
+
+test('vite transforms should not show on coverage report', async () => {
+  const filePath = resolve('./coverage/src/process-env.ts.html')
+  const htmlContent = readFileSync(filePath, 'utf-8')
+
+  // Actual source code
+  expect(htmlContent).toContain('process.env.NODE_ENV')
+})

test/coverage-test/src/process-env.ts

@@ -0,0 +1,3 @@
+export function getNodeEnv() {
+  return process.env.NODE_ENV
+}

test/coverage-test/test/jsdom.test.ts

@@ -0,0 +1,8 @@
+// @vitest-environment jsdom
+
+import { expect, test } from 'vitest'
+import { getNodeEnv } from '../src/process-env'
+
+test('process.env works', () => {
+  expect(getNodeEnv()).toBe('test')
+})