diff --git a/resources/build-deno.js b/resources/build-deno.js
index 1b1685a21a..357879e2f0 100644
--- a/resources/build-deno.js
+++ b/resources/build-deno.js
@@ -4,9 +4,14 @@ const fs = require('fs');
 const path = require('path');
 
 const babel = require('@babel/core');
+const prettier = require('prettier');
 
 const { readdirRecursive, showDirStats } = require('./utils');
 
+const prettierConfig = JSON.parse(
+  fs.readFileSync(require.resolve('../.prettierrc'), 'utf-8'),
+);
+
 if (require.main === module) {
   fs.rmdirSync('./denoDist', { recursive: true, force: true });
   fs.mkdirSync('./denoDist');
@@ -20,7 +25,7 @@ if (require.main === module) {
     if (filepath.endsWith('.js')) {
       const options = { babelrc: false, configFile: './.babelrc-deno.json' };
       const output = babel.transformFileSync(srcPath, options).code + '\n';
-      fs.writeFileSync(destPath, output);
+      writeGeneratedFile(destPath, output);
     } else if (filepath.endsWith('.d.ts')) {
       fs.copyFileSync(srcPath, destPath);
     }
@@ -31,3 +36,8 @@ if (require.main === module) {
 
   showDirStats('./denoDist');
 }
+
+function writeGeneratedFile(filepath, body) {
+  const formatted = prettier.format(body, { filepath, ...prettierConfig });
+  fs.writeFileSync(filepath, formatted);
+}
diff --git a/resources/build-npm.js b/resources/build-npm.js
index e0494eb487..cc168fed9d 100644
--- a/resources/build-npm.js
+++ b/resources/build-npm.js
@@ -5,9 +5,14 @@ const path = require('path');
 const assert = require('assert');
 
 const babel = require('@babel/core');
+const prettier = require('prettier');
 
 const { readdirRecursive, showDirStats } = require('./utils');
 
+const prettierConfig = JSON.parse(
+  fs.readFileSync(require.resolve('../.prettierrc'), 'utf-8'),
+);
+
 if (require.main === module) {
   fs.rmSync('./npmDist', { recursive: true, force: true });
   fs.mkdirSync('./npmDist');
@@ -19,14 +24,15 @@ if (require.main === module) {
 
     fs.mkdirSync(path.dirname(destPath), { recursive: true });
     if (filepath.endsWith('.js')) {
-      const flowBody = '// @flow strict\n' + fs.readFileSync(srcPath, 'utf-8');
+      const flowBody =
+        '// @flow strict\n\n' + fs.readFileSync(srcPath, 'utf-8');
       fs.writeFileSync(destPath + '.flow', flowBody);
 
       const cjs = babelBuild(srcPath, { envName: 'cjs' });
-      fs.writeFileSync(destPath, cjs);
+      writeGeneratedFile(destPath, cjs);
 
       const mjs = babelBuild(srcPath, { envName: 'mjs' });
-      fs.writeFileSync(destPath.replace(/\.js$/, '.mjs'), mjs);
+      writeGeneratedFile(destPath.replace(/\.js$/, '.mjs'), mjs);
     } else if (filepath.endsWith('.d.ts')) {
       fs.copyFileSync(srcPath, destPath);
     }
@@ -37,14 +43,16 @@ if (require.main === module) {
 
   // Should be done as the last step so only valid packages can be published
   const packageJSON = buildPackageJSON();
-  fs.writeFileSync(
-    './npmDist/package.json',
-    JSON.stringify(packageJSON, null, 2),
-  );
+  writeGeneratedFile('./npmDist/package.json', JSON.stringify(packageJSON));
 
   showDirStats('./npmDist');
 }
 
+function writeGeneratedFile(filepath, body) {
+  const formatted = prettier.format(body, { filepath, ...prettierConfig });
+  fs.writeFileSync(filepath, formatted);
+}
+
 function babelBuild(srcPath, options) {
   const { code } = babel.transformFileSync(srcPath, {
     babelrc: false,