add console.log automaticaly to 1-lvl expressions

src/utils/utils.mjs

@@ -0,0 +1,37 @@
+
+import { parseScript } from 'meriyah';
+
+export const addDefaultLog = code => {
+  const lines = code.split('\n');
+  const tree = parseScript(code, { loc: true });
+
+  const insert = ({ line, column }, str, trim = false) => {
+    const l = lines[line-1];
+    lines[line-1] = [
+      trim ? l.substr(0, column).replace(/;$/, '') : l.substr(0, column),
+      str,
+      l.substr(column)
+    ].join('');
+  };
+
+  const exprs = (tree.body
+    .filter(node => node.type === 'ExpressionStatement')
+    .filter(node => {
+      const expr = node.expression;
+      if (expr.type !== 'CallExpression') return true;
+      const callee = expr.callee;
+      if (callee.type !== 'MemberExpression') return true;
+      if (callee.object.type !== 'Identifier') return true;
+      if (callee.object.name !== 'console') return true;
+      return false;
+    })
+  );
+
+  exprs.map(expr => {
+    const { start, end } = expr.loc;
+    insert(end, ');', true);
+    insert(start, 'console.log(');
+  });
+
+  return lines.join('\n');
+};