Moved new build process out of gulp folder

build/favicon.js

@@ -0,0 +1,45 @@
+
+const fs = require('fs-extra');
+const actions = require('./actions');
+const { resolve } = require('./resolve');
+
+function any (input) {
+  for (const i of input) if (i) return i;
+  return false;
+}
+
+const MATCHES = [
+  'favicon.png',
+  'favicon.gif',
+  'favicon.jpeg',
+  'favicon.jpg',
+];
+
+module.exports = exports = async function favicon () {
+
+  const input = any(await Promise.all(
+    MATCHES.map((f) =>
+      fs.exists(resolve(f)).then((y) => y && f),
+    ),
+  ));
+
+  if (!input) return [];
+
+  // input = resolve(input);
+  const tasks = [ 32, 57, 64, 76, 96, 114, 120, 128, 144, 152, 180, 192, 196, 228 ].map((width) => ({
+    input,
+    output: `favicon${width}.png`,
+    format: 'png',
+    width,
+    action: actions.image,
+  }));
+
+  tasks.push({
+    input,
+    output: 'favicon.ico',
+    format: 'ico',
+    action: actions.image,
+  });
+
+  return tasks;
+};