Add lazyHashes option to define integrity hashes only in direct parents of assets (#172)

Also use Node 12 tsconfig base, as the "engine" field in package.json requires.

Author: MLoughry

examples/hwp-custom-template/webpack.config.js

@@ -40,14 +40,16 @@ module.exports = {
 
           const jsIntegrity = stats
             .toJson()
-            .assets.find((asset) => asset.name === "subdir/bundle.js")
-            .integrity;
+            .assets.find(
+              (asset) => asset.name === "subdir/bundle.js"
+            ).integrity;
           expect(jsIntegrity).toMatch(/^sha/);
 
           const cssIntegrity = stats
             .toJson()
-            .assets.find((asset) => asset.name === "subdir/styles.css")
-            .integrity;
+            .assets.find(
+              (asset) => asset.name === "subdir/styles.css"
+            ).integrity;
           expect(cssIntegrity).toMatch(/^sha/);
 
           return new Promise((resolve, reject) => {

examples/lazy-hashes-cycles/1.js

@@ -0,0 +1,5 @@
+import("./2.js");
+import("./leaf.js");
+export default {
+  chunk: 1,
+};

examples/lazy-hashes-cycles/2.js

@@ -0,0 +1,4 @@
+import("./3.js");
+export default {
+  chunk: 2,
+};

examples/lazy-hashes-cycles/3.js

@@ -0,0 +1,4 @@
+import("./1.js");
+export default {
+  chunk: 3,
+};

examples/lazy-hashes-cycles/README.md

@@ -0,0 +1,3 @@
+# Sourcemap and code splitting
+
+Test case for lazy hashes where there is a chunk dependency cycle

examples/lazy-hashes-cycles/index.js

@@ -0,0 +1,3 @@
+import("./1.js");
+import("./2.js");
+console.log("ok");

examples/lazy-hashes-cycles/leaf.js

@@ -0,0 +1,3 @@
+export default {
+  chunk: "leaf",
+};

examples/lazy-hashes-cycles/package.json

@@ -0,0 +1,16 @@
+{
+  "name": "lazy-hashes-cycles",
+  "description": "Test case for lazy hashes where there is a chunk dependency cycle",
+  "version": "1.0.0",
+  "license": "MIT",
+  "private": true,
+  "devDependencies": {
+    "expect": "^26.6.2",
+    "html-webpack-plugin": ">= 5.0.0-beta.1",
+    "nyc": "*",
+    "webpack": "^5.44.0",
+    "webpack-cli": "4",
+    "webpack-subresource-integrity": "*",
+    "wsi-test-helper": "*"
+  }
+}

examples/lazy-hashes-cycles/webpack.config.js

@@ -0,0 +1,75 @@
+const { SubresourceIntegrityPlugin } = require("webpack-subresource-integrity");
+const HtmlWebpackPlugin = require("html-webpack-plugin");
+const { readFileSync } = require("fs");
+const { join } = require("path");
+const expect = require("expect");
+
+module.exports = {
+  entry: {
+    index: "./index.js",
+  },
+  output: {
+    crossOriginLoading: "anonymous",
+  },
+  plugins: [
+    new SubresourceIntegrityPlugin({
+      enabled: true,
+      hashLoading: "lazy",
+    }),
+    new HtmlWebpackPlugin(),
+    {
+      apply: (compiler) => {
+        compiler.hooks.done.tap("wsi-test", (stats) => {
+          if (stats && stats.hasErrors()) {
+            throw new Error(
+              stats
+                .toJson()
+                .errors.map((error) => error.message)
+                .join(", ")
+            );
+          }
+          function getSriHashes(chunkName, isEntry) {
+            const fileContent = readFileSync(
+              join(__dirname, "dist", `${chunkName}.js`),
+              "utf-8"
+            );
+            const sriRegex = new RegExp(
+              `${
+                isEntry
+                  ? "(\\w+|__webpack_require__)\\.sriHashes="
+                  : "Object.assign\\((\\w+|__webpack_require__)\\.sriHashes,"
+              }(?<sriHashJson>\{.*?\})`
+            );
+            const regexMatch = sriRegex.exec(fileContent);
+            const sriHashJson = regexMatch
+              ? regexMatch.groups.sriHashJson
+              : null;
+            if (!sriHashJson) {
+              return null;
+            }
+            try {
+              // The hashes are not *strict* JSON, since they can have numerical keys
+              return JSON.parse(
+                sriHashJson.replace(/\d+(?=:)/g, (num) => `"${num}"`)
+              );
+            } catch (err) {
+              throw new Error(
+                `Could not parse SRI hashes \n\t${sriHashJson}\n in asset: ${err}`
+              );
+            }
+          }
+
+          const indexHashes = getSriHashes("index", true);
+          expect(Object.keys(indexHashes).length).toEqual(3);
+
+          expect(
+            stats
+              .toJson()
+              .assets.filter(({ name }) => /\.js$/.test(name))
+              .every(({ integrity }) => !!integrity)
+          ).toEqual(true);
+        });
+      },
+    },
+  ],
+};

examples/lazy-hashes-multiple-parents/1.js

@@ -0,0 +1,4 @@
+import("./leaf.js");
+export default {
+  chunk: 1,
+};