tyemplate - allowAssigments op

Author: prohazko2

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "@rightech/utils",
-  "version": "0.1.11",
+  "version": "0.1.12",
   "description": "",
   "main": "index.js",
   "private": false,
@@ -18,6 +18,7 @@
   },
   "homepage": "https://github.com/Rightech/node-utils#readme",
   "dependencies": {
+    "acorn-walk": "^7.2.0",
     "angular-expressions": "^1.1.1",
     "colors": "^1.4.0",
     "deepmerge": "^4.2.2",

package.json

@@ -18,6 +18,8 @@
 
 const expressions = require('angular-expressions');
 const mustache = require('mustache');
+const walk = require('acorn-walk');
+
 const nanoid = require('nanoid');
 
 const format = require('./format');
@@ -99,6 +101,11 @@ module.exports = function parseTemplate(text = '', context = {}, opts = {}) {
       }
       try {
         const evaluate = expressions.compile(value);
+        walk.full(evaluate.ast, node => {
+          if (!opts.allowAssignments && node.type === 'AssignmentExpression') {
+            throw new Error('no assignments allowed');
+          }
+        });
         value = evaluate(context);
       } catch (err) {
         if (opts.noSilentError) {