switch to typescript

package.json

@@ -2,9 +2,9 @@
   "name": "axowall",
   "version": "0.0.1",
   "description": "",
-  "main": "src/main.js",
+  "main": "src/main.ts",
   "scripts": {
-    "build": "esbuild src/main.js --bundle --outfile=public/bundle.js",
+    "build": "esbuild src/main.ts --bundle --outfile=public/bundle.js",
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "repository": {

src/content.ts

@@ -6,7 +6,7 @@ const suffixCharset = [
 ].flatMap(set => set.split(""));
 const suffixCharsetBits = 6;
 
-export function makeSuffix(index) {
+export function makeSuffix(index: number): string {
     let result = "";
 
     while (index > 0) {

src/hash.js

@@ -1,23 +0,0 @@
-const hexCharset = "0123456789abcdef".split("");
-
-export const sha256 = "SHA-256";
-
-Uint8Array.prototype.toHex = function() {
-    return [...this].map(c => hexCharset[c >> 4] + hexCharset[c & 15]).join("");
-};
-
-Uint8Array.prototype.hasPrefix = function(array, bits) {
-    for(let i = 0; i < array.length && i * 8 < bits; i++) {
-        const bitsForByte = Math.min(8, bits - i * 8);
-        const bitMask = ((1 << bitsForByte) - 1) << (8 - bitsForByte);
-
-        if ((this[i] & bitMask) != (array[i] & bitMask)) {
-            return false;
-        }
-    }
-    return true;
-};
-
-export async function digest(algo, input) {
-    return new Uint8Array(await crypto.subtle.digest(algo, new TextEncoder().encode(input)));
-}

src/hash.ts

@@ -0,0 +1,32 @@
+const hexCharset = "0123456789abcdef".split("");
+
+export const sha256: AlgorithmIdentifier = "SHA-256";
+
+declare global {
+    interface Uint8Array {
+        toHex(): string;
+        hasPrefix(prefix: Uint8Array, bits: number): boolean;
+    }
+}
+
+Uint8Array.prototype.toHex = function(): string {
+    return [...this].map(c => hexCharset[c >> 4] + hexCharset[c & 15]).join("");
+};
+
+Uint8Array.prototype.hasPrefix = function(prefix: Uint8Array, bits: number): boolean {
+    for(let i = 0; i < prefix.length && i * 8 < bits; i++) {
+        const bitsForByte = Math.min(8, bits - i * 8);
+        const bitMask = ((1 << bitsForByte) - 1) << (8 - bitsForByte);
+        const currentBits = this[i] & bitMask;
+        const prefixBits = prefix[i] & bitMask;
+
+        if (currentBits != prefixBits) {
+            return false;
+        }
+    }
+    return true;
+};
+
+export async function digest(algo: AlgorithmIdentifier, input: string): Promise<Uint8Array> {
+    return new Uint8Array(await crypto.subtle.digest(algo, new TextEncoder().encode(input)));
+}

src/main.ts

@@ -1,12 +1,12 @@
 import {makeSuffix} from "./content";
 import {digest, sha256} from "./hash";
 
-async function findHashWithPrefix(hashPrefixBits, inputPrefix) {
+async function findHashWithPrefix(hashPrefixBits: number, inputPrefix: string): Promise<string> {
-    const hashPrefix = new Uint8Array(Array(Math.ceil(hashPrefixBits / 8)).map(c => 0));
+    const hashPrefix = new Uint8Array(Array(Math.ceil(hashPrefixBits / 8)).map(_ => 0));
     let iteration = 0;
     
     do {
-        var message = inputPrefix + makeSuffix(iteration++)
+        var message = inputPrefix + makeSuffix(iteration++);
         var hash = await digest(sha256, message);
     } while (!hash.hasPrefix(hashPrefix, hashPrefixBits));
     

tsconfig.json

@@ -0,0 +1,5 @@
+{
+  "compilerOptions": {
+    "target": "es2019"
+  }
+}