fix(build-command): report exit code 1 when compilation fails

.gitignore

@@ -2,3 +2,4 @@ node_modules/
 .vscode/
 *.swp
 package-lock.json
+.temp

lib/build.js

@@ -157,6 +157,10 @@ exports.run = function(dir, additionalConfig) {
       if (err) {
         return reject(err);
       }
+      const errors = stats.compilation.errors || []
+      if (errors.length > 0) {
+        return reject(stats.compilation.errors)
+      }
       resolve(stats);
     });
   });

lib/build.spec.js

@@ -0,0 +1,69 @@
+const fs = require("fs");
+const path = require("path");
+const rimraf = require("rimraf");
+const build = require("./build");
+
+jest.mock("./config", () => {
+  const path = require("path");
+  return {
+    load: jest.fn(() => ({
+      build: { functions: path.join(".temp", "build", "lambda") },
+    })),
+    loadContext: jest.fn(() => ({ environment: {} })),
+  };
+});
+
+const buildTemp = path.join(".temp", "build");
+const functions = path.join(buildTemp, "functions");
+
+const setupFunction = (script, filename) => {
+  fs.mkdirSync(functions, { recursive: true });
+  fs.writeFileSync(path.join(functions, filename), script);
+};
+
+describe("build", () => {
+  const functionsBuildOutputDir = require("./config").load().build.functions;
+
+  beforeEach(() => {
+    fs.mkdirSync(buildTemp, { recursive: true });
+  });
+
+  afterEach(() => {
+    rimraf.sync(buildTemp);
+  });
+
+  describe("run", () => {
+    it("should return webpack stats on successful build", async () => {
+      const script = `module.exports = () => console.log("hello world")`;
+      setupFunction(script, "index.js");
+
+      const stats = await build.run(functions);
+      expect(stats.compilation.errors).toHaveLength(0);
+      expect(
+        fs.existsSync(path.join(functionsBuildOutputDir, "index.js"))
+      ).toEqual(true);
+    });
+
+    it("should throw error on complication errors", async () => {
+      const script = `module.exports = () => console.log("hello`;
+      setupFunction(script, "index.js");
+
+      expect.assertions(1);
+
+      await expect(build.run(functions)).rejects.toHaveLength(1);
+    });
+
+    it("should throw error on invalid config", async () => {
+      const script = `module.exports = () => console.log("hello world")`;
+      setupFunction(script, "index.js");
+
+      expect.assertions(1);
+
+      await expect(
+        build.run(functions, {
+          userWebpackConfig: "non-existing-webpack-config.js",
+        })
+      ).rejects.toThrow("Cannot find module");
+    });
+  });
+});

package.json

@@ -46,7 +46,8 @@
   "devDependencies": {
     "auto-changelog": "^1.13.0",
     "gh-release": "^3.5.0",
-    "jest": "^23.6.0"
+    "jest": "^23.6.0",
+    "rimraf": "^3.0.2"
   },
   "engines": {
     "node": ">=8.0.0"