wazehaodeMBP:VUE-Test wazehao$ npm run dev

> vue-test@1.0.0 dev /Users/wazehao/code/VsCode/VUE-Test

> cross-env NODE_ENV=development webpack-dev-server --config webpack.config.js

/Users/wazehao/code/VsCode/VUE-Test/webpack.config.js:58

        new webpack.DefinPlugin({

        ^

TypeError: webpack.DefinPlugin is not a constructor

    at Object.<anonymous> (/Users/wazehao/code/VsCode/VUE-Test/webpack.config.js:58:9)

    at Module._compile (internal/modules/cjs/loader.js:1156:30)

    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1176:10)

    at Module.load (internal/modules/cjs/loader.js:1000:32)

    at Function.Module._load (internal/modules/cjs/loader.js:899:14)

    at Module.require (internal/modules/cjs/loader.js:1042:19)

    at require (internal/modules/cjs/helpers.js:77:18)

    at WEBPACK_OPTIONS (/Users/wazehao/code/VsCode/VUE-Test/node_modules/webpack-cli/bin/utils/convert-argv.js:114:13)

    at requireConfig (/Users/wazehao/code/VsCode/VUE-Test/node_modules/webpack-cli/bin/utils/convert-argv.js:116:6)

    at /Users/wazehao/code/VsCode/VUE-Test/node_modules/webpack-cli/bin/utils/convert-argv.js:123:17

npm ERR! code ELIFECYCLE

npm ERR! errno 1

npm ERR! vue-test@1.0.0 dev: `cross-env NODE_ENV=development webpack-dev-server --config webpack.config.js`

npm ERR! Exit status 1

npm ERR! 

npm ERR! Failed at the vue-test@1.0.0 dev script.

npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:

npm ERR!     /Users/wazehao/.npm/_logs/2020-05-02T01_43_46_817Z-debug.log