feat: babel runner support sourcemaps generation

Signed-off-by: Charlike Mike Reagent <opensource@tunnckocore.com>

Author: tunnckoCore

@tunnckocore/jest-runner-babel/src/runner.js

@@ -10,39 +10,47 @@ const explorer = cosmiconfig('jest-runner');
 
 const isWin32 = os.platform() === 'win32';
 
+/* eslint max-statements: ["error", 25] */
 export default async function jetRunnerBabel({ testPath, config }) {
   const start = new Date();
   let options = normalizeRunnerConfig(explorer.searchSync());
   const cfgs = [].concat(options.babel).filter(Boolean);
 
   const testResults = await Promise.all(
-    cfgs.map(({ config: cfg, ...opts }) => {
+    cfgs.reduce((acc, { config: cfg, ...opts }) => {
       options = { ...options, ...opts };
+
       let result = null;
-      // index += 1;
 
+      const babelConfig = { ...cfg };
+
+      // sasa;
       try {
-        result = transformFileSync(testPath, cfg);
+        result = transformFileSync(testPath, babelConfig);
       } catch (err) {
-        return fail({
-          start,
-          end: new Date(),
-          test: { path: testPath, title: 'Babel', errorMessage: err.message },
-        });
+        return acc.concat(
+          fail({
+            start,
+            end: new Date(),
+            test: { path: testPath, title: 'Babel', errorMessage: err.message },
+          }),
+        );
       }
 
       // Classics in the genre! Yes, it's possible, sometimes.
       // Old habit for ensurance
       if (!result) {
-        return fail({
-          start,
-          end: new Date(),
-          test: {
-            path: testPath,
-            title: 'Babel',
-            errorMessage: `Babel runner fails...`,
-          },
-        });
+        return acc.concat(
+          fail({
+            start,
+            end: new Date(),
+            test: {
+              path: testPath,
+              title: 'Babel',
+              errorMessage: `Babel runner fails...`,
+            },
+          }),
+        );
       }
 
       let relativeTestPath = path.relative(config.rootDir, testPath);
@@ -53,15 +61,15 @@ export default async function jetRunnerBabel({ testPath, config }) {
 
       // if not in monorepo, the `outs.dir` will be empty
       const outs = relativeTestPath.split('/').reduce(
-        (acc, item, idx) => {
+        (accumulator, item, idx) => {
           // only if we are in monorepo we want to get the first 2 items
           if (options.isMonorepo(config.cwd) && idx < 2) {
-            return { ...acc, dir: acc.dir.concat(item) };
+            return { ...accumulator, dir: accumulator.dir.concat(item) };
           }
 
           return {
-            ...acc,
-            file: acc.file
+            ...accumulator,
+            file: accumulator.file
               .concat(item === options.srcDir ? null : item)
               .filter(Boolean),
           };
@@ -85,12 +93,32 @@ export default async function jetRunnerBabel({ testPath, config }) {
       fs.mkdirSync(outDir, { recursive: true });
       fs.writeFileSync(outFile, result.code);
 
-      return pass({
-        start,
-        end: new Date(),
-        test: { path: outFile, title: 'Babel' },
-      });
-    }),
+      if (result.map || babelConfig.sourceMaps === true) {
+        const mapFile = `${outFile}.map`;
+        fs.writeFileSync(mapFile, JSON.stringify(result.map));
+
+        return acc.concat(
+          pass({
+            start,
+            end: new Date(),
+            test: { path: outFile, title: 'Babel' },
+          }),
+          pass({
+            start,
+            end: new Date(),
+            test: { path: mapFile, title: 'Babel' },
+          }),
+        );
+      }
+
+      return acc.concat(
+        pass({
+          start,
+          end: new Date(),
+          test: { path: outFile, title: 'Babel' },
+        }),
+      );
+    }, []),
   );
 
   return testResults;

jest-runner.config.js

@@ -18,6 +18,7 @@ module.exports = {
       config: {
         presets: [['@tunnckocore/babel-preset', presetOptions]],
         comments: false,
+        sourceMaps: 'both',
       },
       outDir: 'dist/main',
     },
@@ -27,6 +28,7 @@ module.exports = {
           ['@tunnckocore/babel-preset', { ...presetOptions, modules: false }],
         ],
         comments: false,
+        sourceMaps: 'both',
       },
       outDir: 'dist/module',
     },

package.json

@@ -22,7 +22,7 @@
     "build": "jest -c jest.build.config.js",
     "release": "lerna version && lerna publish from-package",
     "cr": "node create-package.js",
-    "resque": "lerna exec 'babel src -d dist/main --presets @tunnckocore' --stream"
+    "resque": "lerna exec 'babel src -d dist/main --presets @tunnckocore --source-maps both' --stream"
   },
   "dependencies": {
     "@babel/cli": "^7.6.0",