feat: Enforce dependencies for imports from node modules in package.json

Co-authored-by: Mikko Aspiala <mikko.aspiala@gmail.com>

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

packages/infrastructure/webpack/src/get-node-config.js

@@ -1,6 +1,5 @@
 const ForkTsCheckerPlugin = require("fork-ts-checker-webpack-plugin");
-const nodeExternals = require("webpack-node-externals");
+const { ProtectFromImportingNonDependencies } = require("./plugins/protect-from-importing-non-dependencies");
-const path = require("path");
 
 module.exports = ({ entrypointFilePath, outputDirectory }) => ({
   name: entrypointFilePath,
@@ -14,10 +13,12 @@ module.exports = ({ entrypointFilePath, outputDirectory }) => ({
   },
 
   resolve: {
-    extensions: [".ts", ".tsx"],
+    extensions: [".ts", ".tsx", ".js"],
   },
 
   plugins: [
+    new ProtectFromImportingNonDependencies(),
+
     new ForkTsCheckerPlugin({
       typescript: {
         mode: "write-dts",

packages/infrastructure/webpack/src/plugins/get-dependency-name/get-dependency-name.js

@@ -0,0 +1,9 @@
+const getDependencyName = (requireString) => {
+  const [a, b] = requireString.split("/");
+
+  const scoped = a.startsWith("@");
+
+  return scoped ? `${a}/${b}` : a;
+};
+
+module.exports = { getDependencyName };

packages/infrastructure/webpack/src/plugins/get-dependency-name/get-dependency-name.test.js

@@ -0,0 +1,27 @@
+import { getDependencyName } from "./get-dependency-name";
+
+describe("get-dependency-name", () => {
+  it("given scoped dependency with entrypoint, returns dependency name", () => {
+    const actual = getDependencyName("@some-scope/some-package/entrypoint");
+
+    expect(actual).toBe("@some-scope/some-package");
+  });
+
+  it("given scoped dependency but no entrypoint, returns dependency name", () => {
+    const actual = getDependencyName("@some-scope/some-package");
+
+    expect(actual).toBe("@some-scope/some-package");
+  });
+
+  it("given non scoped dependency with entrypoint, returns dependency name", () => {
+    const actual = getDependencyName("some-package/some-entrypoint");
+
+    expect(actual).toBe("some-package");
+  });
+
+  it("given non scoped dependency but no entrypoint, returns dependency name", () => {
+    const actual = getDependencyName("some-package");
+
+    expect(actual).toBe("some-package");
+  });
+});

packages/infrastructure/webpack/src/plugins/protect-from-importing-non-dependencies.js

@@ -0,0 +1,54 @@
+const path = require("path");
+const { getDependencyName } = require("./get-dependency-name/get-dependency-name");
+
+const pathToPackageJson = path.resolve(process.cwd(), "package.json");
+
+class ProtectFromImportingNonDependencies {
+  apply(compiler) {
+    const dependencies = getDependenciesAndPeerDependencies();
+
+    const nodeModulesToBeResolved = new Set();
+
+    compiler.hooks.normalModuleFactory.tap("irrelevant", (normalModuleFactory) => {
+      normalModuleFactory.hooks.resolve.tap("irrelevant", (toBeResolved) => {
+
+        const isLocalDependency = toBeResolved.request.startsWith(".");
+        const isDependencyOfDependency =
+          toBeResolved.context.includes("node_modules");
+
+        if (!isLocalDependency && !isDependencyOfDependency) {
+
+          const dependencyName = getDependencyName(toBeResolved.request);
+
+          nodeModulesToBeResolved.add(dependencyName);
+        }
+      });
+    });
+
+    compiler.hooks.afterCompile.tap("compile", () => {
+      const notSpecifiedDependencies = [...nodeModulesToBeResolved].filter(
+        (x) => !dependencies.includes(x)
+      );
+
+      if (notSpecifiedDependencies.length) {
+        throw new Error(
+          `Tried to import dependencies that are not specified in the package.json "${pathToPackageJson}". Add "${notSpecifiedDependencies.join(
+            '", "'
+          )}" to dependencies or peerDependencies.`
+        );
+      }
+    });
+  }
+}
+const getDependenciesAndPeerDependencies = () => {
+  const packageJson = require(pathToPackageJson);
+
+  const dependencies = Object.keys(packageJson.dependencies || {});
+  const peerDependencies = Object.keys(packageJson.peerDependencies || {});
+
+  return [...dependencies, ...peerDependencies];
+};
+
+module.exports = {
+  ProtectFromImportingNonDependencies,
+};