wip: Use browser resolve

package.json

@@ -158,6 +158,9 @@
       "**/*.spec.js"
     ]
   },
+  "browser": {
+    "./lib/crypto_subtle.js": "./lib/crypto_subtle_browser.js"
+  },
   "size-limit": [
     {
       "path": "build/esm/index.js",

src/lib/crypto.ts

@@ -1,26 +1,4 @@
-import nodeCrypto from "crypto";
-
-// IE 11
-declare global {
-  interface Window {
-    msCrypto?: Crypto;
-  }
-
-  interface Crypto {
-    webkitSubtle?: SubtleCrypto;
-  }
-}
-
-const crypto =
-  (typeof window !== "undefined" &&
-    (window as Window) &&
-    (window.crypto || window.msCrypto)) ||
-  (nodeCrypto.webcrypto as unknown as Crypto);
-const subtle: SubtleCrypto = crypto.subtle || crypto.webkitSubtle;
-
-if (subtle === undefined) {
-  throw new Error("crypto and/or subtle api unavailable");
-}
+import { crypto, subtle } from "./crypto_subtle";
 
 export { crypto, subtle };
 

src/lib/crypto_subtle.ts

@@ -0,0 +1,15 @@
+import nodeCrypto from "crypto";
+
+// Types do not seem up-to-date
+const crypto: Crypto = nodeCrypto.webcrypto as unknown as Crypto;
+if (crypto === undefined) {
+  throw new Error("node crypto api unavailable");
+}
+
+const subtle: SubtleCrypto = crypto.subtle || crypto.webkitSubtle;
+
+if (subtle === undefined) {
+  throw new Error("node subtle api unavailable");
+}
+
+export { crypto, subtle };

src/lib/crypto_subtle_browser.ts

@@ -0,0 +1,22 @@
+declare global {
+  interface Window {
+    msCrypto?: Crypto;
+  }
+
+  interface Crypto {
+    webkitSubtle?: SubtleCrypto;
+  }
+}
+
+const crypto = window.crypto || window.msCrypto;
+if (crypto === undefined) {
+  throw new Error("browser crypto api unavailable");
+}
+
+const subtle: SubtleCrypto = crypto.subtle || crypto.webkitSubtle;
+
+if (subtle === undefined) {
+  throw new Error("browser subtle api unavailable");
+}
+
+export { crypto, subtle };