feat: move to base91 to decrease wasm size

lib/_wasm/build.ts

@@ -1,6 +1,6 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 // adopted from https://deno.land/[email protected]/hash/_wasm/build.ts
-import { encode as base64Encode } from "https://deno.land/[email protected]/encoding/base64.ts";
+import { encode as base91Encode } from "https://deno.land/x/base91/base91.ts";
 
 // 1. build wasm
 async function buildWasm(path: string): Promise<void> {
@@ -25,16 +25,16 @@ async function buildWasm(path: string): Promise<void> {
 // 2. encode wasm
 async function encodeWasm(wasmPath: string): Promise<string> {
   const wasm = await Deno.readFile(`${wasmPath}/scrypt_wasm_bg.wasm`);
-  return base64Encode(wasm);
+  return base91Encode(wasm);
 }
 
 // 3. generate script
 async function generate(wasm: string, output: string): Promise<void> {
   const initScript = await Deno.readTextFile(`${output}/scrypt_wasm.js`);
   const denoHashScript = "/* eslint-disable */\n"
     + "//deno-fmt-ignore-file\n"
-    + `import * as base64 from "https://deno.land/[email protected]/encoding/base64.ts";`
-    + `export const source = base64.decode("${wasm}");`
+    + `import { decode } from "https://deno.land/x/base91/base91.ts";`
+    + `export const source = decode("${wasm.replaceAll('"', '\\"')}");`
     + initScript;
 
   await Deno.writeFile("wasm.js", new TextEncoder().encode(denoHashScript));