Support CJS again (#797)

We will also support CJS to make it a dual package. It seems that for
Typescript, it needs to be version 5.3 or higher.

Additionally, I have introduced two validators for the dual package.
1. publint https://publint.dev/
2. arethetypeswrong https://arethetypeswrong.github.io/

.github/workflows/test.yml

@@ -48,7 +48,7 @@ jobs:
       run: export NODE_OPTIONS=--openssl-legacy-provider; npm run docs:build
     - name: Test building examples (CJS)
       run: |
-        cd examples/echo-bot-ts
+        cd examples/echo-bot-ts-cjs
         npm run build-sdk
         npm install
         npm run build
@@ -60,3 +60,7 @@ jobs:
         npm install
         npm run build
         cd -
+    - name: publint
+      run: npx publint
+    - name: validate package
+      run: npx @arethetypeswrong/cli $(npm pack)

examples/echo-bot-ts/README.md → examples/echo-bot-ts-cjs/README.md

@@ -1,12 +1,14 @@
-# LINE Echo Bot with TypeScript
+# Echo Bot for LINE using TypeScript and CJS
 
-An example LINE bot to echo message with TypeScript. The bot is coded according to TypeScript's best practices.
+Welcome to this simple guide on how to create an Echo Bot for the LINE messaging platform using TypeScript and CommonJS (CJS).
+An Echo Bot is a basic bot that replies to a user's message with the same content.
+This tutorial will help you set up a LINE Echo Bot from scratch.
 
 ## Prerequisite
 
-- Git
-- Node.js version 10 and up
-- LINE Developers Account for the bot
+- Node.js version 18 or higher
+- You've created a channel in the LINE Developers Console, and got your channel access token and channel secret.
+  - Read https://developers.line.biz/en/docs/messaging-api/getting-started/#using-console if you haven't done this yet.
 
 ## Installation
 
@@ -19,7 +21,7 @@ git clone https://github.com/line/line-bot-sdk-nodejs.git
 - Change directory to the example.
 
 ```bash
-cd line-bot-sdk-nodejs/examples/echo-bot-ts
+cd line-bot-sdk-nodejs/examples/echo-bot-ts-cjs
 ```
 
 - Install all dependencies.
@@ -43,7 +45,7 @@ export PORT=<YOUR_PORT>
 https://example.com/callback
 ```
 
-- Compile the TypeScript files.
+- Build the application.
 
 ```bash
 npm run build

examples/echo-bot-ts/index.ts → examples/echo-bot-ts-cjs/index.ts

@@ -16,7 +16,6 @@ const clientConfig: ClientConfig = {
 };
 
 const middlewareConfig: MiddlewareConfig = {
-  channelAccessToken: process.env.CHANNEL_ACCESS_TOKEN,
   channelSecret: process.env.CHANNEL_SECRET || '',
 };