feat: replace version with build-time variable.

Version number will be replaced by webpack on build. Also remove version
unittest since it is redundant now.

src/util.ts

@@ -7,4 +7,4 @@ export function isValidPassword(p: string | undefined): boolean {
   return Boolean(p && p.length >= 8 && p.length <= 16)
 }
 
-export const version = '1.3.0'
+export const version: string = process.env.VERSION || 'Development'

webpack.config.js

@@ -3,10 +3,15 @@ import path from 'node:path'
 import url from 'node:url'
 
 import TsconfigPathsPlugin from 'tsconfig-paths-webpack-plugin'
+import webpack from 'webpack'
 
 const projectRootPath = path.resolve(path.dirname(url.fileURLToPath(import.meta.url)))
+const packageJson = JSON.parse(fs.readFileSync(path.resolve(projectRootPath, 'package.json')))
+const version = packageJson.version
 const outputDir = path.resolve(projectRootPath, 'dist')
 
+const versionPlugin = new webpack.DefinePlugin({ 'process.env.VERSION': JSON.stringify(version) })
+
 export default {
   mode: 'production',
   entry: './src/index.ts',
@@ -32,5 +37,6 @@ export default {
   experiments: {
     topLevelAwait: true
   },
-  externals: ['utf-8-validate', 'bufferutil']
+  externals: ['utf-8-validate', 'bufferutil'],
+  plugins: [versionPlugin]
 }