feat: exclude unexpected file in sourcemap result

Author: bvanjoi

lib/report.js

@@ -128,6 +128,15 @@ class Report {
         map.merge(converter.toIstanbul())
       }
     }
+
+    if (!this.all) {
+      for (const fileURL in map.data) {
+        if (!this.exclude.shouldInstrument(fileURL)) {
+          delete map.data[fileURL]
+        }
+      }
+    }
+
     this._allCoverageFiles = map
     return this._allCoverageFiles
   }

test/fixtures/bundle.js

@@ -646,4 +646,16 @@ describe('c8', () => {
       output.toString('utf8').should.matchSnapshot()
     })
   })
+
+  it('exclude unexpected file in result', () => {
+    const { output } = spawnSync(nodePath, [
+      c8Path,
+      '--exclude="test/*.js"',
+      '--temp-directory=tmp/bundle',
+      '--clean=false',
+      nodePath,
+      require.resolve('./fixtures/bundle.js')
+    ])
+    output.toString('utf8').should.matchSnapshot() 
+  })
 })

test/fixtures/bundle.js.map

@@ -289,6 +289,17 @@ All files   |      75 |       50 |     100 |      75 |
 ,"
 `;
 
+exports[`c8 exclude unexpected file in result 1`] = `
+",reachable
+----------|---------|----------|---------|---------|-------------------
+File      | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s 
+----------|---------|----------|---------|---------|-------------------
+All files |     100 |      100 |     100 |     100 |                   
+ index.js |     100 |      100 |     100 |     100 |                   
+----------|---------|----------|---------|---------|-------------------
+,"
+`;
+
 exports[`c8 merges reports from subprocesses together 1`] = `
 ",first