fix: ignore hint to exclude lines

lib/v8-to-istanbul.js

@@ -281,8 +281,10 @@ module.exports = class V8ToIstanbul {
       s: {}
     }
     source.lines.forEach((line, index) => {
-      statements.statementMap[`${index}`] = line.toIstanbul()
-      statements.s[`${index}`] = line.ignore ? 1 : line.count
+      if (!line.ignore) {
+        statements.statementMap[`${index}`] = line.toIstanbul()
+        statements.s[`${index}`] = line.count
+      }
     })
     return statements
   }

tap-snapshots/test/v8-to-istanbul.js.test.cjs

@@ -385,8 +385,6 @@ Object {
     "31": 1,
     "32": 1,
     "33": 1,
-    "34": 1,
-    "35": 1,
     "36": 1,
     "37": 1,
     "4": 1,
@@ -677,26 +675,6 @@ Object {
         "line": 34,
       },
     },
-    "34": Object {
-      "end": Object {
-        "column": 22,
-        "line": 35,
-      },
-      "start": Object {
-        "column": 0,
-        "line": 35,
-      },
-    },
-    "35": Object {
-      "end": Object {
-        "column": 28,
-        "line": 36,
-      },
-      "start": Object {
-        "column": 0,
-        "line": 36,
-      },
-    },
     "36": Object {
       "end": Object {
         "column": 1,

test/fixtures/scripts/ignored.lines.js

@@ -1,4 +1,13 @@
-/* c8 ignore next 3 */
 function sum(a, b) {
+  if(a === 2 && b === 2) {
+    return 4;
+  }
+
+  /* v8 ignore start */ // Line 6
+  if (a === '10') {
+    return add(a, b)
+  }
+  /* v8 ignore stop */ // Line 10
+
   return a + b;
-};
+};

test/v8-to-istanbul.js

@@ -140,7 +140,7 @@ ${'//'}${'#'} sourceMappingURL=data:application/json;base64,${base64Sourcemap}
       Object.keys(v8ToIstanbul.toIstanbul()).should.eql(['/src/index.ts', '/src/utils.ts'].map(path.normalize))
     })
 
-    it('ignore hint marks statements of uncovered file as covered', async () => {
+    it('ignore hint marks statements of uncovered file as excluded', async () => {
       const filename = require.resolve('./fixtures/scripts/ignored.lines.js')
       const source = readFileSync(filename, 'utf-8')
       const v8ToIstanbul = new V8ToIstanbul(pathToFileURL(filename).href)
@@ -163,7 +163,19 @@ ${'//'}${'#'} sourceMappingURL=data:application/json;base64,${base64Sourcemap}
       const coverageMap = v8ToIstanbul.toIstanbul()
       const { s } = coverageMap[filename]
 
-      assert.deepStrictEqual(s, { 0: 1, 1: 1, 2: 1, 3: 1 })
+      assert.equal(s[0], 0)
+      assert.equal(s[1], 0)
+      assert.equal(s[2], 0)
+      assert.equal(s[3], 0)
+      assert.equal(s[4], 0)
+      assert.equal(s[5], undefined) // Line 6
+      assert.equal(s[6], undefined)
+      assert.equal(s[7], undefined)
+      assert.equal(s[8], undefined)
+      assert.equal(s[9], undefined) // Line 10
+      assert.equal(s[10], 0)
+      assert.equal(s[11], 0)
+      assert.equal(s[12], 0)
     })
   })