Nuxt@2.4.5 Issue with modules that edit native JS objects prototypes.

Usage

git clone git@github.com:voronianski/nuxt-2.4.5-prototype-issue.git
cd nuxt-2.4.5-prototype-issue
npm i
npm run dev

What’s the problem?

This dummy project is created to show the problem that appears only in Nuxt@2.4.x and is not present in Nuxt@2.3.x.

1. the project uses NPM module vue-string-format created to reproduce the issue

2. vue-string-format NPM module just adds format function to String.prototype and registers it as Vue filter

export default {
  install(Vue) {
    if (!String.prototype.format) {
      String.prototype.format = function(...args) {
        return this.replace(/{(\d+)}/g, function(match, number) {
          return typeof args[number] !== 'undefined' ? args[number] : match;
        });
      };
    }

    Vue.filter('format', (value, ...args) => {
      return value.format(args);
    });
  }
};

3. it is used in plugins/index.js:

import Vue from 'vue';
import StringFormat from 'vue-string-format';

export default () => {
  Vue.use(StringFormat);
};

4. in pages/index.vue the format function is used on the string directly

<template lang="pug">
  .main-page
    h3 {{title}}
</template>

<script>
export default {
  computed: {
    title() {
      return 'Title - {0}'.format('index page');
    }
  }
};
</script>

5. when running the project it returns an error in template

 ERROR  [Vue warn]: Error in render: "TypeError: "Title - {0}".format is not a function"

found in

---> <Src/pages/index.vue> at src/pages/index.vue
       <Nuxt>
         <.nuxt/layouts/default.vue> at .nuxt/layouts/default.vue
           <Root>

SO FOR SOME REASON format FUNCTION WAS REMOVED FROM String.prototype

P.S. If you will try to use vendor/string-format.js and not NPM module everything will be fine:

import Vue from 'vue';
// import StringFormat from 'vue-string-format';
import StringFormat from '../vendor/string-format';

export default () => {
  Vue.use(StringFormat);
};

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