fix: require optional dependency conditionally

prettier and webpack are only available in dev environment.

content/utils.ts

@@ -1,8 +1,6 @@
 import path from "path";
 import childProcess from "child_process";
-
 import LRU from "lru-cache";
-import prettier from "prettier";
 
 import { CONTENT_ROOT, CONTENT_TRANSLATED_ROOT } from "../libs/env";
 import { slugToFolder as _slugToFolder } from "../libs/slug-utils";
@@ -107,7 +105,8 @@ export function execGit(args, opts: { cwd?: string } = {}, root = null) {
 export function toPrettyJSON(value) {
   const json = JSON.stringify(value, null, 2) + "\n";
   try {
-    return prettier.format(json, { parser: "json" });
+    // eslint-disable-next-line n/no-unpublished-require
+    return require("prettier").format(json, { parser: "json" });
   } catch (e) {
     return json;
   }

server/dev.ts

@@ -1,11 +1,13 @@
-import webpack from "webpack";
-import webpackDevMiddleware from "webpack-dev-middleware";
-import webpackHotMiddleware from "webpack-hot-middleware";
-import { WebpackConfiguration } from "webpack-dev-server";
+import type { WebpackConfiguration } from "webpack-dev-server";
 
 export const devMiddlewares = [];
 
 if (process.env.NODE_ENV === "development") {
+  /* eslint-disable n/no-unpublished-require */
+  const webpack = require("webpack");
+  const webpackDevMiddleware = require("webpack-dev-middleware");
+  const webpackHotMiddleware = require("webpack-hot-middleware");
+
   const webpackConfig: WebpackConfiguration = {
     entry: {
       app: [