Allow disabling sourcemap support

package.json

@@ -1,6 +1,6 @@
 {
   "name": "ts-jest",
-  "version": "22.4.1",
+  "version": "22.4.2",
   "main": "index.js",
   "types": "./dist/index.d.ts",
   "description": "A preprocessor with sourcemap support to help use Typescript with Jest",

src/jest-types.ts

@@ -85,4 +85,5 @@ export interface TsJestConfig {
   tsConfigFile?: string;
   enableInternalCache?: boolean;
   enableTsDiagnostics?: boolean;
+  disableSourceMapSupport?: boolean;
 }

src/preprocessor.ts

@@ -68,11 +68,10 @@ export function process(
     transformOptions,
   );
 
-  const modified = injectSourcemapHook(
-    filePath,
-    tsTranspiled.outputText,
-    outputText,
-  );
+  const modified =
+    tsJestConfig.disableSourceMapSupport === true
+      ? outputText
+      : injectSourcemapHook(filePath, tsTranspiled.outputText, outputText);
 
   flushLogs();
 

tests/__tests__/disable-sourcemap-support.spec.ts

@@ -0,0 +1,43 @@
+import runJest from '../__helpers__/runJest';
+import { process } from '../../src/preprocessor';
+import * as utils from '../../src/utils';
+
+describe('sourcemap-support', () => {
+  function runProcess(jestConfig = {}) {
+    return process('input_code', 'fake_file.ts', jestConfig, {
+      instrument: false,
+    });
+  }
+
+  it('should be used by default', () => {
+    const spy = jest.spyOn(utils, 'injectSourcemapHook');
+
+    runProcess();
+    expect(spy).toHaveBeenCalled();
+
+    spy.mockReset();
+    spy.mockRestore();
+  });
+
+  it(`should not be used when the disableSourceMapSupport flag is set to true`, async () => {
+    const spy = jest.spyOn(utils, 'injectSourcemapHook');
+
+    runProcess({ globals: { 'ts-jest': { disableSourceMapSupport: true } } });
+    expect(spy).not.toHaveBeenCalled();
+
+    spy.mockReset();
+    spy.mockRestore();
+  });
+
+  it(`should be used when the disableSourceMapSupport flag is set to anything other than true`, async () => {
+    const spy = jest.spyOn(utils, 'injectSourcemapHook');
+
+    runProcess({ globals: { 'ts-jest': { disableSourceMapSupport: 'true' } } });
+    expect(spy).toHaveBeenCalled();
+    runProcess({ globals: { 'ts-jest': { disableSourceMapSupport: 1 } } });
+    expect(spy).toHaveBeenCalled();
+
+    spy.mockReset();
+    spy.mockRestore();
+  });
+});