Add rootDir to runtime FileNotFound error message (#5693) (#5702)

Author: Tamas Lakatos

CHANGELOG.md

@@ -8,6 +8,8 @@
   ([#5558](https://github.com/facebook/jest/pull/5558))
 * `[jest-matcher-utils]` Add `isNot` option to `matcherHint` function
   ([#5512](https://github.com/facebook/jest/pull/5512))
+* `[jest-config]` Add `<rootDir>` to runtime files not found error report
+  ([#5693](https://github.com/facebook/jest/pull/5693))
 * `[expect]` Make toThrow matcher pass only if Error object is returned from
   promises ([#5670](https://github.com/facebook/jest/pull/5670))
 * `[expect]` Add isError to utils

packages/jest-config/src/utils.js

@@ -40,7 +40,8 @@ export const resolve = (rootDir: string, key: string, filePath: Path) => {
     throw createValidationError(
       `  Module ${chalk.bold(filePath)} in the ${chalk.bold(
         key,
-      )} option was not found.`,
+      )} option was not found.
+         ${chalk.bold('<rootDir>')} is: ${rootDir}`,
     );
   }