Support SRI on webpack-plugin

🚀 Feature Proposal

Putting an integrity string for SRI into loadable-stats.json when building bundles.

Motivation

To embed integrity attribute for each script tag when running SSR application with loadable components, I need to read the file and compute the integrity value on runtime. Instead of that, I would like to compute the integrity value at the building phase to reduce overhead on runtime.

Example

Putting integrity value into loadable-stats.json

{
      "name": "xxx-e63d1f6f130186a006da.js",
      "size": 782370,
      "integrity": "sha384-oqVuAfXRKap7fdgcCY5uykM6+R9GqQ8K/uxy9rx7HNQlGYl1kPzQho1wx4JwY8wC", 
      "chunks": [],
      "chunkNames": [],
      "emitted": false
},

Then it could be great if we can access the value on attrFn for getScriptTags

[yayoc]

I agree with loading the plugin as optional for the first step since integrity seems not so high demand. @neoziro

[stale[bot]]

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