WARNING There are multiple modules with names that only differ in casing.

[mewcrazy]

WARNING in ./node_modules/Vue/dist/vue.runtime.esm.js There are multiple modules with names that only differ in casing. This can lead to unexpected behavior when compiling on a filesystem with other case-semantic. Use equal casing. Compare these module identifiers:

• J:\node_modules\Vue\dist\vue.runtime.esm.js Used by 1 module(s), i. e. J:\node_modules\vuecsv\dist\vuecsv.min.js
• J:\node_modules\vue\dist\vue.runtime.esm.js Used by 125 module(s), i. e. J:\node_modules\buble-loader\index.js??ref--1!J:\src\entry\app.js @ ./node_modules/Vue/dist/vue.runtime.esm.js @ ./node_modules/vuecsv/dist/vuecsv.min.js @ ./node_modules/buble-loader??ref--1!./nodemodules/vue-loader/lib??vue-loader-options!./src/pages/offers.vue?vue&type=script&lang=js& @ ./src/pages/offers.vue?vue&type=script&lang=js& @ ./src/pages/offers.vue @ ./src/pages sync ^(?:(?!\/?).)+.(vue|js)$ @ ./src/router.js @ ./src/entry/app.js @ ./src/entry/client.js @ multi webpack-hot-middleware/client ./src/entry/client.js Child html-webpack-plugin for "index.html": Asset Size Chunks Chunk Names index.html 4.45 KiB 0 Entrypoint undefined = index.html [./node_modules/html-webpack-plugin/lib/loader.js!./src/layout.pug] 313 bytes {0} [built] i ｢wdm｣: Compiled with warnings.

[mewcrazy]

I'm on windows, but it seems that you are referencing Vue as "Vue" in your code, while all other packages reference it with "vue".