Installing Gatsby plugins removes necessary files in node_modules directory

[sethjenks]

Node: v6.10.2
macOS: 10.12.5
Gatsby: 1.0.11

It seems that Installing 'gatsby-plugin-styled-components' on a fresh install of Gatsby 1.0.11 removes a bunch the files in the node_modules folder.

After installing and running gatsby develop I get A local install of Gatsby was not found. You should save Gatsby as a site dependency e.g. npm install --save gatsby

I've tried this with a couple other plugins and I get a similar result.

gatsby-config.js

module.exports = {
  siteMetadata: {
    title: `Gatsby Default Starter`,
  },
  plugins: [`gatsby-plugin-react-helmet`,
            `gatsby-plugin-styled-components,`
           ],
}

package.json

{
  "name": "gatsby-starter-default",
  "description": "Gatsby default starter",
  "version": "1.0.0",
  "author": "Kyle Mathews <mathews.kyle@gmail.com>",
  "dependencies": {
    "gatsby": "^1.0.1",
    "gatsby-link": "^1.0.1",
    "gatsby-plugin-react-helmet": "^1.0.1",
    "gatsby-transformer-yaml": "^1.0.1"
  },
  "devDependencies": {
    "gh-pages": "^0.12.0"
  },
  "keywords": [
    "gatsby"
  ],
  "license": "MIT",
  "main": "n/a",
  "scripts": {
    "build": "gatsby build",
    "deploy": "gatsby build --prefix-paths && gh-pages -d public",
    "develop": "gatsby develop",
    "format": "prettier --trailing-comma es5 --no-semi --single-quote --write \"pages/*.js\" \"utils/*.js\" \"wrappers/*.js\" \"html.js\"",
    "test": "echo \"Error: no test specified\" && exit 1"
  }
}

Is anyone else having a similar issue?

[KyleAMathews]

NPM is behaving very oddly. Perhaps try Yarn and see if that works better for you. https://yarnpkg.com/en/

[benjaminhoffman]

@sethjenks is your issue solved? Closing this for now bc of inactivity but feel free to re-open if I am mistaken.