checkpoint: lock return type in testable unit module

Author: bjacobgordon

vitest/TestableUnit/getAllThatAreMissingTestCompanion.ts

@@ -1,4 +1,5 @@
 import {
+  type ParsedPath,
   parse,
   resolve,
 } from 'path';
@@ -7,7 +8,7 @@ import {
   fileURLToPath,
 } from 'url';
 
-const TestableUnit_getAllThatAreMissingTestCompanion = () => {
+const TestableUnit_getAllThatAreMissingTestCompanion = (): ParsedPath[] => {
   const pathToCurrentModule = fileURLToPath(import.meta.url);
   const pathToProjectRoot = resolve(pathToCurrentModule, '../../');
   const relativePathsToUnitsWithoutCompanions = ['src/library/a.ts', 'src/features/b.ts', 'src/library/c/d.ts'];