sourcemap can be a string

Author: SimenB

packages/babel-jest/src/__tests__/index.ts

@@ -36,6 +36,8 @@ test(`Returns source string with inline maps when no transformOptions is passed`
   expect(result.map).toBeDefined();
   expect(result.code).toMatch('//# sourceMappingURL');
   expect(result.code).toMatch('customMultiply');
-  expect(result.map!.sources).toEqual(['dummy_path.js']);
-  expect(JSON.stringify(result.map!.sourcesContent)).toMatch('customMultiply');
+  // @ts-ignore: it's fine if we get wrong types, the tests will fail then
+  expect(result.map.sources).toEqual(['dummy_path.js']);
+  // @ts-ignore: it's fine if we get wrong types, the tests will fail then
+  expect(JSON.stringify(result.map.sourcesContent)).toMatch('customMultiply');
 });

packages/jest-types/src/Transform.ts

@@ -10,16 +10,18 @@ import {Path, ProjectConfig} from './Config';
 
 export type TransformedSource = {
   code: string;
-  map?: // copied from https://github.com/DefinitelyTyped/DefinitelyTyped/blob/363cdf403a74e0372e87bbcd15eb1668f4c5230b/types/babel__core/index.d.ts#L371-L379
-  {
-    version: number;
-    sources: string[];
-    names: string[];
-    sourceRoot?: string;
-    sourcesContent?: string[];
-    mappings: string;
-    file: string;
-  } | null;
+  map?:  // copied from https://github.com/DefinitelyTyped/DefinitelyTyped/blob/363cdf403a74e0372e87bbcd15eb1668f4c5230b/types/babel__core/index.d.ts#L371-L379
+    | {
+        version: number;
+        sources: string[];
+        names: string[];
+        sourceRoot?: string;
+        sourcesContent?: string[];
+        mappings: string;
+        file: string;
+      }
+    | string
+    | null;
 };
 
 export type TransformResult = {