fix a couple more type errors

Author: SimenB

packages/jest-core/src/SearchSource.ts

@@ -43,9 +43,12 @@ type FilterResult = {
 type TestPathCases = {
   roots: (path: Config.Path) => boolean;
   testMatch: (path: Config.Path) => boolean;
-  testRegex: (path: Config.Path) => boolean;
   testPathIgnorePatterns: (path: Config.Path) => boolean;
-  testPathPattern?: (path: Config.Path) => boolean;
+  testRegex: (path: Config.Path) => boolean;
+};
+
+type TestPathCasesWithPathPattern = TestPathCases & {
+  testPathPattern: (path: Config.Path) => boolean;
 };
 
 const globsToMatcher = (globs?: Array<Config.Glob> | null) => {
@@ -105,27 +108,38 @@ export default class SearchSource {
     testPathPattern?: string,
   ): SearchResult {
     const data: {
-      stats: {[key in keyof TestPathCases]: number};
+      stats: {
+        [key in keyof (TestPathCases | TestPathCasesWithPathPattern)]: number
+      };
       tests: Array<Test>;
       total: number;
     } = {
-      stats: {},
+      stats: {
+        roots: 0,
+        testMatch: 0,
+        testPathIgnorePatterns: 0,
+        testRegex: 0,
+      },
       tests: [],
       total: allPaths.length,
     };
 
     const testCases = Object.assign({}, this._testPathCases);
     if (testPathPattern) {
       const regex = testPathPatternToRegExp(testPathPattern);
-      testCases.testPathPattern = (path: Config.Path) => regex.test(path);
+      (testCases as TestPathCasesWithPathPattern).testPathPattern = (
+        path: Config.Path,
+      ) => regex.test(path);
     }
 
-    const testCasesKeys = Object.keys(testCases) as Array<keyof TestPathCases>;
+    const testCasesKeys = Object.keys(testCases) as Array<
+      keyof (TestPathCases | TestPathCasesWithPathPattern)
+    >;
     data.tests = allPaths.filter(test =>
       testCasesKeys.reduce((flag, key) => {
         if (testCases[key](test.path)) {
           if (data.stats[key] === undefined) {
-            data.stats[key] = 1;
+            data.stats[key] = 0;
           }
           ++data.stats[key]!;
           return flag && true;
@@ -135,6 +149,13 @@ export default class SearchSource {
       }, true),
     );
 
+    // TODO: Is this necessary? Done to keep the object the same as before the TS migration
+    testCasesKeys.forEach(key => {
+      if (data.stats[key] === 0) {
+        delete data.stats[key];
+      }
+    });
+
     return data;
   }