Add integrity to modulepreload links if defined

Author: novucs

src/generator.ts

@@ -826,11 +826,21 @@ export class Generator {
       for (let dep of preloadDeps.sort()) {
         if (first || whitespace) preloads += newlineTab;
         if (first) first = false;
-        preloads += `<link rel="modulepreload" href="${
+        const url =
           rootUrl || htmlUrl
             ? relativeUrl(new URL(dep), new URL(rootUrl || htmlUrl), !!rootUrl)
-            : dep
-        }" />`;
+            : dep;
+        preloads += `<link rel="modulepreload" href="${url}"${
+          integrity
+            ? ` integrity="${await getIntegrity(
+                new Uint8Array(
+                  await (
+                    await fetch(url, this.traceMap.resolver.fetchOpts)
+                  ).arrayBuffer()
+                )
+              )}"`
+            : ""
+        } />`;
       }
     }
 

test/html/preload.test.js

@@ -97,7 +97,7 @@ assert.strictEqual(
     "<!-- Generated by @jspm/generator - https://github.com/jspm/generator -->\n" +
     `<script async src="${esmsUrl}" crossorigin="anonymous" integrity="${esmsIntegrity}"></script>\n` +
     `<script type="importmap">{"imports":{"react":"https://ga.jspm.io/npm:[email protected]/index.js"},"scopes":{"https://ga.jspm.io/":{"object-assign":"https://ga.jspm.io/npm:[email protected]/index.js"}},"integrity":{"https://ga.jspm.io/npm:[email protected]/index.js":"sha384-iQp1zoaqIhfUYyYkz3UNk1QeFfmBGgt1Ojq0kZD5Prql1g7fgJVzVgsjDoR65lv8","https://ga.jspm.io/npm:[email protected]/cjs/react.production.min.js":"${reactProductionIntegrity}","https://ga.jspm.io/npm:[email protected]/index.js":"${reactIndexIntegrity}"}}</script>\n` +
-    '<link rel="modulepreload" href="https://ga.jspm.io/npm:[email protected]/index.js" /><link rel="modulepreload" href="https://ga.jspm.io/npm:[email protected]/cjs/react.production.min.js" /><link rel="modulepreload" href="https://ga.jspm.io/npm:[email protected]/index.js" />\n' +
+    `<link rel="modulepreload" href="https://ga.jspm.io/npm:[email protected]/index.js" integrity="sha384-iQp1zoaqIhfUYyYkz3UNk1QeFfmBGgt1Ojq0kZD5Prql1g7fgJVzVgsjDoR65lv8" /><link rel="modulepreload" href="https://ga.jspm.io/npm:[email protected]/cjs/react.production.min.js" integrity="${reactProductionIntegrity}" /><link rel="modulepreload" href="https://ga.jspm.io/npm:[email protected]/index.js" integrity="${reactIndexIntegrity}" />\n` +
     '<script type="module">\n' +
     "  import 'react';\n" +
     "</script>\n"