Bump os-locale (add support for ESM dependencies)

jest.config.js

@@ -1,3 +1,4 @@
+/** @type {import('jest').Config} */
 module.exports = {
   coveragePathIgnorePatterns: [
     '<rootDir>/node_modules/',
@@ -27,7 +28,7 @@ module.exports = {
     '^.+\\.js$': 'babel-jest',
     '^.+\\.txt$': '<rootDir>/tests/jest-raw-loader.js',
   },
-  transformIgnorePatterns: ['<rootDir>/node_modules/'],
+  transformIgnorePatterns: ['<rootDir>/node_modules/(?!os-locale)'],
   testEnvironment: 'node',
   verbose: false,
 };

package.json

@@ -64,7 +64,7 @@
     "image-size": "1.1.1",
     "jed": "1.1.1",
     "json-merge-patch": "1.0.2",
-    "os-locale": "5.0.0",
+    "os-locale": "6.0.2",
     "pino": "8.20.0",
     "semver": "7.6.3",
     "source-map-support": "0.5.21",

src/utils.js

@@ -4,7 +4,7 @@ import upath from 'upath';
 import Jed from 'jed';
 import semver from 'semver';
 import { oneLine } from 'common-tags';
-import osLocale from 'os-locale';
+import { osLocaleSync } from 'os-locale';
 
 import log from 'logger';
 import { PACKAGE_TYPES, LOCAL_PROTOCOLS } from 'const';
@@ -136,7 +136,7 @@ export function getVariable(context, name) {
 }
 
 export function getLocale() {
-  return osLocale.sync();
+  return osLocaleSync();
 }
 
 export function getI18Data(locale) {

webpack.config.js

@@ -6,14 +6,19 @@ const webpack = require('webpack');
 // eslint-disable-next-line import/no-extraneous-dependencies
 const nodeExternals = require('webpack-node-externals');
 
+// ESM packages must be bundled because webpack will otherwise turn `require()` into `import()`
+// and make the import silently asynchronous. In most cases this breaks the import.
+const dependenciesToBundle = [
+  'os-locale', // Used exclusively in sync functions
+];
+
 module.exports = {
   // Set the webpack4 mode 'none' for compatibility with the behavior of the
   // webpack3 bundling step.
   mode: 'none',
   entry: {
     'addons-linter': './src/main.js',
   },
-  target: 'node',
   output: {
     filename: '[name].js',
     libraryTarget: 'commonjs2',
@@ -38,6 +43,7 @@ module.exports = {
   externals: [
     nodeExternals({
       modulesFromFile: true,
+      allowlist: dependenciesToBundle,
     }),
   ],
   plugins: [