feat: extension support (#78)

pkg/download/engine/polyfill/src/blob/index.js

@@ -0,0 +1,3 @@
+import { Blob } from "blob-polyfill";
+
+globalThis.Blob = Blob;

pkg/download/engine/polyfill/src/crypto/index.js

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+globalThis.crypto = {
+    getRandomValues(arr) {
+        for (let i = 0, len = arr.length; i < len; i++) {
+            arr[i] = Math.floor(Math.random() * 256);
+        }
+        return arr;
+    },
+    randomUUID() {
+        return '10000000-1000-4000-8000-100000000000'.replace(/[018]/g, (c) => {
+            return (c ^ (this.getRandomValues(new Uint8Array(1))[0] & (15 >> (c / 4)))).toString(16)
+        })
+    }
+}

pkg/download/engine/polyfill/src/fetch/index.js

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+import 'whatwg-fetch'

pkg/download/engine/polyfill/src/index.js

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+import "./blob/index.js"
+import "./crypto/index.js"
+import "./fetch/index.js"