update buffer ref in esploader (#127)

* update buffer ref in esploader

* add missing type set as module

* update rollup to es script

package.json

@@ -1,6 +1,7 @@
 {
   "name": "esptool-js",
   "version": "0.4.0",
+  "type": "module",
   "module": "lib/index.js",
   "main": "lib/index.js",
   "types": "lib/index.d.ts",
@@ -28,6 +29,7 @@
     "url": "https://github.com/espressif/esptool-js/issues"
   },
   "dependencies": {
+    "buffer": "^6.0.3",
     "pako": "^2.1.0",
     "tslib": "^2.4.1"
   },
@@ -42,7 +44,6 @@
     "@typescript-eslint/eslint-plugin": "^5.43.0",
     "@typescript-eslint/parser": "^5.43.0",
     "babel-loader": "^9.1.0",
-    "buffer": "^5.7.1",
     "eslint": "^8.28.0",
     "eslint-config-prettier": "^8.5.0",
     "eslint-plugin-jsdoc": "^46.4.5",

rollup.config.js

@@ -1,8 +1,8 @@
-const resolve = require('@rollup/plugin-node-resolve');
-const babel =  require("@rollup/plugin-babel");
-const commonjs = require('@rollup/plugin-commonjs');
-const terser = require('@rollup/plugin-terser');
-const json = require('@rollup/plugin-json');
+import resolve from '@rollup/plugin-node-resolve';
+import babel from "@rollup/plugin-babel";
+import commonjs from '@rollup/plugin-commonjs';
+import terser from '@rollup/plugin-terser';
+import json from '@rollup/plugin-json';
 
 // rollup.config.js
 /**
@@ -17,12 +17,13 @@ const config = {
     inlineDynamicImports: true
   },
   plugins: [
-    resolve(),
+    resolve({ preferBuiltins: false}),
     commonjs(),
     babel({ exclude: 'node_modules/**', babelHelpers: "runtime", skipPreflightCheck: true }),
     json({ namedExports: false, preferConst: true }),
     terser()
   ],
 };
 
-module.exports.default = config;
+const _default = config;
+export { _default as default };

src/esploader.ts

@@ -3,6 +3,7 @@ import { Data, deflate, Inflate } from "pako";
 import { Transport, SerialOptions } from "./webserial";
 import { ROM } from "./targets/rom";
 import { customReset, usbJTAGSerialReset } from "./reset";
+import { Buffer } from "buffer/index";
 
 /* global SerialPort */
 
@@ -1140,7 +1141,6 @@ export class ESPLoader {
    */
   async runStub() {
     this.info("Uploading stub...");
-
     let decoded = Buffer.from(this.chip.ROM_TEXT, "base64").toString("binary");
     let chardata = decoded.split("").map(function (x) {
       return x.charCodeAt(0);