diff --git a/build.js b/build.js
new file mode 100755
index 0000000..0487f99
--- /dev/null
+++ b/build.js
@@ -0,0 +1,42 @@
+#!/usr/bin/env node
+
+import { argv, env } from "node:process";
+import { cp, mkdir, rm } from "fs/promises";
+import { dirname, join } from "path";
+import { fileURLToPath } from "url";
+import { chromeifyManifestFile } from "./chromeifyManifest.impl.js";
+import webExt from "web-ext";
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = dirname(__filename);
+const __main = argv[1] === __filename;
+const distDir = join(__dirname, "dist");
+const distManifest = join(distDir, "manifest.json");
+const srcDir = join(__dirname, "src");
+const chrome = argv.includes("--chrome") || /yes|true|1/i.test(env.CHROME || "");
+
+async function main() {
+    await rm(distDir, {recursive: true, force: true});
+    await mkdir(distDir);
+    await cp(srcDir, distDir, {recursive: true});
+
+    let filename;
+
+    if (chrome) {
+        await chromeifyManifestFile(distManifest);
+        filename = "{name}-{version}-chrome.zip";
+    } else {
+        filename = "{name}-{version}.zip";
+    }
+
+    await webExt.cmd.build({
+        artifactsDir: "web-ext-artifacts",
+        sourceDir: distDir,
+        overwriteDest: true,
+        filename: filename,
+    });
+}
+
+if (__main) {
+    main().catch(console.error);
+}
diff --git a/build.sh b/build.sh
deleted file mode 100755
index 79d1019..0000000
--- a/build.sh
+++ /dev/null
@@ -1,19 +0,0 @@
-#!/bin/sh
-
-set -e
-set -v
-
-rm -fr dist/
-mkdir dist
-cp -a src/. dist/
-
-if [ x$CHROME = xyes ]; then
-    ./chromeifyManifest.js src/manifest.json > dist/manifest.json
-    rm dist/background.html
-
-    FILENAME="{name}-{version}-chrome.zip"
-else
-    FILENAME="{name}-{version}.zip"
-fi
-
-npx web-ext build --overwrite-dest --filename "$FILENAME"
diff --git a/chromeifyManifest.impl.js b/chromeifyManifest.impl.js
index 89672eb..499fa5b 100644
--- a/chromeifyManifest.impl.js
+++ b/chromeifyManifest.impl.js
@@ -1,3 +1,5 @@
+import { readFile, writeFile } from "fs/promises";
+
 export function chromeifyManifest(manifest) {
     manifest["manifest_version"] = 3;
     manifest["minimum_chrome_version"] = "97";
@@ -16,26 +18,9 @@ export function chromeifyManifest(manifest) {
     return manifest;
 }
 
-export function parseArgs(args) {
-    switch (args.length) {
-    case 0:
-        return ["-", "-"];
-    case 1:
-        return [args[0], "-"];
-    default:
-        return [args[0], args[1]];
-    }
-}
-
-export function transformStream(instream, outstream) {
-    const chunks = [];
-
-    instream.on("data", (data) => chunks.push(data));
-    instream.on("end", function() {
-        const manifest = chromeifyManifest(JSON.parse(chunks.join("")));
+export async function chromeifyManifestFile(path) {
+    const options = {"encoding": "utf-8"};
+    const manifest = chromeifyManifest(JSON.parse(await readFile(path, options)));
 
-        outstream.write(JSON.stringify(manifest, null, 4));
-        outstream.end("\n");
-    });
-    instream.resume();
+    await writeFile(path, JSON.stringify(manifest, null, 4), options);
 }
diff --git a/chromeifyManifest.js b/chromeifyManifest.js
deleted file mode 100755
index eb8c1b1..0000000
--- a/chromeifyManifest.js
+++ /dev/null
@@ -1,12 +0,0 @@
-#!/usr/bin/env node
-/* eslint-env node */
-
-import fs from "fs";
-
-import { parseArgs, transformStream } from "./chromeifyManifest.impl.js";
-
-const [infile, outfile] = parseArgs(process.argv.slice(2));
-const instream = (infile === "-") ? process.stdin : fs.createReadStream(infile);
-const outstream = (outfile === "-") ? process.stdout : fs.createWriteStream(outfile);
-
-transformStream(instream, outstream);
diff --git a/package.json b/package.json
index 686d442..588212b 100644
--- a/package.json
+++ b/package.json
@@ -9,8 +9,8 @@
   "scripts": {
     "test": "mocha",
     "coverage": "c8 mocha",
-    "build": "./build.sh",
-    "buildChrome": "CHROME=yes ./build.sh"
+    "build": "./build.js",
+    "buildChrome": "./build.js --chrome"
   },
   "exports": {
     "./*": "./src/*"