使用Webpack dev server升级后，Webpack CopyPlugin无法再从目录复制字体

我刚刚升级到最新的CopyPlugin、CleanWebpack、Webpack等，我无法复制我的字体。他们在升级之前工作得很好。有什么想法吗

new CopyPlugin({
      patterns: [
        { from: 'src/assets/fonts', to: 'fonts' },
      ],
    }),
    new WriteFilePlugin()

版本：

    "clean-webpack-plugin": "^3.0.0",
    "copy-webpack-plugin": "^6.1.0",
    "webpack": "^4.44.1",
    "webpack-cli": "^3.3.12",
    "webpack-dev-server": "^3.11.0",

回购：

错误：

ERROR in ./src/App/app.scss
Module build failed (from ./node_modules/mini-css-extract-plugin/dist/loader.js):
ModuleBuildError: Module build failed (from ./node_modules/css-loader/dist/cjs.js):
Error: Can't resolve '/fonts/OpenSans-Regular.ttf' in '/Users/raptoria/projects/pnlchart/src/App'
    at /Users/raptoria/projects/pnlchart/node_modules/enhanced-resolve/lib/Resolver.js:209:21
    at /Users/raptoria/projects/pnlchart/node_modules/enhanced-resolve/lib/Resolver.js:285:5
    at eval (eval at create (/Users/raptoria/projects/pnlchart/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:15:1)
    at /Users/raptoria/projects/pnlchart/node_modules/enhanced-resolve/lib/UnsafeCachePlugin.js:44:7
    at /Users/raptoria/projects/pnlchart/node_modules/enhanced-resolve/lib/Resolver.js:285:5
    at eval (eval at create (/Users/raptoria/projects/pnlchart/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:15:1)
    at /Users/raptoria/projects/pnlchart/node_modules/enhanced-resolve/lib/Resolver.js:285:5
    at eval (eval at create (/Users/raptoria/projects/pnlchart/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:27:1)
    at /Users/raptoria/projects/pnlchart/node_modules/enhanced-resolve/lib/DescriptionFilePlugin.js:67:43
    at /Users/raptoria/projects/pnlchart/node_modules/enhanced-resolve/lib/Resolver.js:285:5
    at eval (eval at create (/Users/raptoria/projects/pnlchart/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:16:1)
    at /Users/raptoria/projects/pnlchart/node_modules/enhanced-resolve/lib/Resolver.js:285:5
    at eval (eval at create (/Users/raptoria/projects/pnlchart/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:16:1)
    at /Users/raptoria/projects/pnlchart/node_modules/enhanced-resolve/lib/Resolver.js:285:5
    at eval (eval at create (/Users/raptoria/projects/pnlchart/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:16:1)
    at /Users/raptoria/projects/pnlchart/node_modules/enhanced-resolve/lib/Resolver.js:285:5
    at /Users/raptoria/projects/pnlchart/node_modules/webpack/lib/NormalModule.js:316:20
    at /Users/raptoria/projects/pnlchart/node_modules/loader-runner/lib/LoaderRunner.js:367:11
    at /Users/raptoria/projects/pnlchart/node_modules/loader-runner/lib/LoaderRunner.js:233:18
    at context.callback (/Users/raptoria/projects/pnlchart/node_modules/loader-runner/lib/LoaderRunner.js:111:13)
    at Object.loader (/Users/raptoria/projects/pnlchart/node_modules/css-loader/dist/index.js:154:5)
    at processTicksAndRejections (internal/process/task_queues.js:94:5)
 @ ./src/App/App.tsx 23:0-21
 @ ./src/index.tsx
ℹ ｢wdm｣: Failed to compile.

./src/App/App.scss中的

错误
模块构建失败（来自./node\u modules/mini css extract plugin/dist/loader.js）：
ModuleBuildError:模块构建失败（来自./node_modules/css loader/dist/cjs）：
错误：无法解析“/Users/raptoria/projects/pnlchart/src/App”中的“/font/OpenSans Regular.ttf”
at/Users/raptoria/projects/pnlchart/node_modules/enhanced resolve/lib/Resolver.js:209:21
at/Users/raptoria/projects/pnlchart/node_modules/enhanced resolve/lib/Resolver.js:285:5
评估时（创建时评估（/Users/raptoria/projects/pnlchart/node_modules/tapable/lib/HookCodeFactory.js:33:10），：15:1）
at/Users/raptoria/projects/pnlchart/node_modules/enhanced resolve/lib/unsafeccheplugin.js:44:7
at/Users/raptoria/projects/pnlchart/node_modules/enhanced resolve/lib/Resolver.js:285:5
评估时（创建时评估（/Users/raptoria/projects/pnlchart/node_modules/tapable/lib/HookCodeFactory.js:33:10），：15:1）
at/Users/raptoria/projects/pnlchart/node_modules/enhanced resolve/lib/Resolver.js:285:5
评估时（创建时评估（/Users/raptoria/projects/pnlchart/node_modules/tapable/lib/HookCodeFactory.js:33:10），：27:1）
at/Users/raptoria/projects/pnlchart/node_modules/enhanced resolve/lib/DescriptionFilePlugin.js:67:43
at/Users/raptoria/projects/pnlchart/node_modules/enhanced resolve/lib/Resolver.js:285:5
评估时（创建时评估（/Users/raptoria/projects/pnlchart/node_modules/tapable/lib/HookCodeFactory.js:33:10），：16:1）
at/Users/raptoria/projects/pnlchart/node_modules/enhanced resolve/lib/Resolver.js:285:5
评估时（创建时评估（/Users/raptoria/projects/pnlchart/node_modules/tapable/lib/HookCodeFactory.js:33:10），：16:1）
at/Users/raptoria/projects/pnlchart/node_modules/enhanced resolve/lib/Resolver.js:285:5
评估时（创建时评估（/Users/raptoria/projects/pnlchart/node_modules/tapable/lib/HookCodeFactory.js:33:10），：16:1）
at/Users/raptoria/projects/pnlchart/node_modules/enhanced resolve/lib/Resolver.js:285:5
at/Users/raptoria/projects/pnlchart/node_modules/webpack/lib/NormalModule.js:316:20
at/Users/raptoria/projects/pnlchart/node_modules/loader runner/lib/LoaderRunner.js:367:11
at/Users/raptoria/projects/pnlchart/node_modules/loader runner/lib/LoaderRunner.js:233:18
在context.callback（/Users/raptoria/projects/pnlchart/node_modules/loader runner/lib/LoaderRunner.js:111:13）
在Object.loader（/Users/raptoria/projects/pnlchart/node_modules/css loader/dist/index.js:154:5）
在处理和拒绝时（内部/process/task_queues.js:94:5）
@./src/App/App.tsx 23:0-21
@./src/index.tsx
ℹ ｢wdm：未能编译。