output variable analysis to meta/variables.json in dist

Author: shawnbot

script/dist.js

@@ -69,6 +69,7 @@ remove(outDir)
         const meta = {bundles}
         return writeFile(join(outDir, 'meta.json'), JSON.stringify(meta, null, 2), encoding)
       })
+      .then(writeVariableData)
       .then(writeDeprecationData)
   })
   .catch(error => {
@@ -102,3 +103,10 @@ function writeDeprecationData() {
   }
   return writeFile(join(outDir, 'deprecations.json'), JSON.stringify(data, null, 2))
 }
+
+function writeVariableData() {
+  const analyzeVariables = require('./analyze-variables')
+  return analyzeVariables('src/support/index.scss').then(data =>
+    writeFile(join(outDir, 'variables.json'), JSON.stringify(data, null, 2))
+  )
+}