Use esm

Newer nodes enforce this

Author: sebmarkbage

scripts/rollup/generate-inline-fizz-runtime.js

@@ -1,7 +1,6 @@
 'use strict';
 
 const fs = require('fs');
-const ClosureCompiler = require('google-closure-compiler').compiler;
 const prettier = require('prettier');
 
 const instructionDir =
@@ -46,6 +45,7 @@ const config = [
 const prettierConfig = require('../../.prettierrc.js');
 
 async function main() {
+  const ClosureCompiler = (await import('google-closure-compiler')).compiler;
   const exportStatements = await Promise.all(
     config.map(async ({entry, exportName}) => {
       const fullEntryPath = instructionDir + '/' + entry;

scripts/rollup/plugins/closure-plugin.js

@@ -1,12 +1,12 @@
 'use strict';
 
-const ClosureCompiler = require('google-closure-compiler').compiler;
 const {promisify} = require('util');
 const fs = require('fs');
 const tmp = require('tmp');
 const writeFileAsync = promisify(fs.writeFile);
 
-function compile(flags) {
+async function compile(flags) {
+  const ClosureCompiler = (await import('google-closure-compiler')).compiler;
   return new Promise((resolve, reject) => {
     const closureCompiler = new ClosureCompiler(flags);
     closureCompiler.run(function (exitCode, stdOut, stdErr) {