webpack配置new HtmlWebpackPlugin({      inject: true,      minify: {        ignoreCustomFragments: [ /\${[a-zA-Z]*?}/],      },      template: paths.appHtml    }),html<script>    var a="${a}";    var b="$";</script>報錯Template execution failed: ReferenceError: a is not defined請問要怎么配置才能夠讓插件忽略${}