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node_modules/postcss-px-to-viewport/example/index.js

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+'use strict';
+
+var fs = require('fs');
+var postcss = require('postcss');
+var pxToViewport = require('..');
+var css = fs.readFileSync('main.css', 'utf8');
+
+var processedCss = postcss(pxToViewport()).process(css).css;
+
+fs.writeFile('main-viewport.css', processedCss, function (err) {
+  if (err) {
+    throw err;
+  }
+  console.log('File with viewport units written.');
+});