Errors with new versions of postcss

[craigbeck]

With my web pack build I get output

Unknown error from PostCSS plugin. Your current PostCSS version is 7.0.17, but parser uses 5.2.18. Perhaps this is the source of the error below

postcss-modules-parser has a dependency on older version of postcss

$ npm ls postcss
/Users/craigbeck/dev/premise-frontend-v3
├─┬ [email protected]
│ └── [email protected] 
├─┬ [email protected]
│ ├── [email protected]  deduped
│ ├─┬ [email protected]
│ │ ├─┬ [email protected]
│ │ │ ├── [email protected] 
│ │ │ ├─┬ [email protected]
│ │ │ │ └── [email protected]  deduped
│ │ │ └─┬ [email protected]
│ │ │   └── [email protected]  deduped
│ │ └── [email protected]  deduped
│ ├─┬ [email protected]
│ │ └── [email protected] 
│ ├─┬ [email protected]
│ │ └── [email protected] 
│ ├─┬ [email protected]
│ │ └── [email protected] 
│ ├─┬ [email protected]
│ │ └── [email protected] 
│ └─┬ [email protected]
│   └── [email protected] 
├─┬ [email protected]
│ ├─┬ [email protected]
│ │ └── [email protected] 
│ ├── [email protected] 
│ └─┬ [email protected]
│   └── [email protected]  deduped
├─┬ [email protected]
│ └── [email protected] 
├─┬ [email protected]
│ └── [email protected]  deduped
├─┬ [email protected]
│ └── [email protected]  deduped
├─┬ [email protected]
│ ├─┬ [email protected]
│ │ └── [email protected]  deduped
│ └── [email protected]  deduped
├─┬ [email protected]
│ └── [email protected]  deduped
├─┬ [email protected]
│ ├── [email protected]  deduped
│ ├─┬ [email protected]
│ │ └── [email protected]  deduped
│ ├─┬ [email protected]
│ │ └── [email protected]  deduped
│ ├─┬ [email protected]
│ │ └── [email protected]  deduped
│ ├─┬ [email protected]
│ │ └── [email protected]  deduped
│ ├─┬ [email protected]
│ │ └── [email protected]  deduped
│ └─┬ [email protected]
│   └── [email protected]  deduped
└─┬ [email protected]
  ├── [email protected]  deduped
  └─┬ [email protected]
    └── [email protected]  deduped

Looking at the code it appears it's only dependency is on postcss.plugin so thinking this may be better handled with a sibling dependency?

postcss-icss/src/index.js

Line 48 in 80fad33

module.exports = postcss.plugin("postcss-icss", (options = {}) => (