Moved new build process out of gulp folder

build/lib/markdown-token-filter.js

@@ -0,0 +1,46 @@
+
+const { flatten } = require('lodash');
+
+module.exports = exports = function (md) {
+  md.core.ruler.push(
+    'modify-token',
+    (state) => {
+      state.tokens = flatten(state.tokens.map(descend).filter(Boolean));
+      return false;
+    },
+  );
+};
+
+function descend (token) {
+
+  switch (token.type) {
+  case 'link_open':
+  case 'link_close':
+  case 'html_block':
+    return false;
+
+  case 'heading_open':
+    token.type = 'paragraph_open';
+    token.tag = 'p';
+    token.markup = '';
+    return token;
+
+  case 'heading_close':
+    token.type = 'paragraph_close';
+    token.tag = 'p';
+    token.markup = '';
+    return token;
+
+  case 'image':
+  case 'container':
+    return token.children;
+
+  default:
+
+    if (token.children && token.children.length) {
+      token.children = flatten(token.children.map(descend).filter(Boolean));
+    }
+
+    return token;
+  }
+}