add base64 converter util script

package.json

@@ -29,6 +29,7 @@
     "gas-cost": "ts-node src/utils/gas-costs.ts",
     "docgen": "hardhat docgen",
     "save-tag": "chmod a+x ./src/utils/git-tag/save-tag.sh && bash ./src/utils/git-tag/save-tag.sh",
+    "base64": "ts-node src/utils/convert-base64.ts",
     "mongo:start": "docker-compose up -d",
     "mongo:stop": "docker-compose stop",
     "mongo:down": "docker-compose down",

src/utils/convert-base64.ts

@@ -0,0 +1,19 @@
+
+
+const toBase64 = (str : string) => btoa(str);
+
+const fromBase64 = (str : string) => atob(str);
+
+const [
+  toOrFrom,
+  str,
+] = process.argv.slice(2);
+
+
+if (toOrFrom === "to") {
+  console.log(toBase64(str));
+} else if (toOrFrom === "from") {
+  console.log(fromBase64(str));
+} else {
+  console.log("Invalid arguments");
+}