Commits on Jan 20, 2015

1. Add 'varify' browserify transform to support IE9,10 …

   In f4648fc I documented a way to use convict under browserify. That was fine, until trying IE<11, which currently breaks because convict uses `const`.
   
   Fortunately, browserify has [a feature for that](https://github.com/substack/node-browserify#browserifytransform), and a simple browserify transform exists for this specific const→var simplification: [varify](https://www.npmjs.com/package/varify).
   
   * The good:
       * Fixes IE9,IE10 compatibility.
       * Only impacts browserify usage (your usage of `const` out of browserify persists, and unit tests impact is null).
   * The bad:
       * But additional work on convict using other recent features unsupported by IE might re-break it...
       * ... and I don't see an easy way to unit-test this...
       * ... but we can add more transforms when that happens.
   
   Still, that improves the situation now, doesn't hurt, and is using the recommended browserify feature for this specific need, so I think it's worthwhile.

   

   ronjouch committed Jan 20, 2015
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