Convert lz4-compress.js to mjs. NFC

Author: sbc100

third_party/mini-lz4.js

@@ -343,3 +343,4 @@ return exports;
 
 })();
 
+module.exports = MiniLZ4;

tools/file_packager.py

@@ -745,9 +745,8 @@ def generate_js(data_target, data_files, metadata):
       # LZ4FS usage
       temp = data_target + '.orig'
       shutil.move(data_target, temp)
-      meta = shared.run_js_tool(utils.path_from_root('tools/lz4-compress.js'),
-                                [utils.path_from_root('third_party/mini-lz4.js'),
-                                temp, data_target], stdout=PIPE)
+      meta = shared.run_js_tool(utils.path_from_root('tools/lz4-compress.mjs'),
+                                [temp, data_target], stdout=PIPE)
       os.unlink(temp)
       use_data = '''var compressedData = %s;
             compressedData['data'] = byteArray;

tools/lz4-compress.js renamed to tools/lz4-compress.mjs

@@ -4,13 +4,14 @@
 // University of Illinois/NCSA Open Source License.  Both these licenses can be
 // found in the LICENSE file.
 
-'use strict';
+import * as fs from 'fs';
+import * as path from 'path';
 
-const fs = require('fs');
-const path = require('path');
+globalThis.assert = (x, message) => {
+  if (!x) throw new Error(message);
+};
 
-const arguments_ = process.argv.slice(2);
-const debug = false;
+const MiniLZ4 = await import('../third_party/mini-lz4.js');
 
 function print(x) {
   process.stdout.write(x + '\n');
@@ -39,19 +40,13 @@ function load(f) {
   globalEval(read(f));
 }
 
-global.assert = (x, message) => {
-  if (!x) throw new Error(message);
-};
-
 // Redirect console.log message from MiniLZ4 to stderr since stdout is
 // where we return the decompressed data.
 console.log = printErr;
 
-const lz4 = arguments_[0];
-const input = arguments_[1];
-const output = arguments_[2];
-
-load(lz4);
+const arguments_ = process.argv.slice(2);
+const input = arguments_[0];
+const output = arguments_[1];
 
 const data = new Uint8Array(readBinary(input)).buffer;
 const start = Date.now();