use single Ajv

src/core/component.js

@@ -1,7 +1,7 @@
 const MarkdownIt = require('markdown-it');
 const md = new MarkdownIt({html: true, xhtmlOut: false, linkify: true});
 
-const { uniqBy, validator, flatten, cloneDeep } = require('../utils');
+const { uniqBy, ajv, flatten, cloneDeep } = require('../utils');
 const _get = require('lodash/get');
 const _set = require('lodash/set');
 
@@ -130,7 +130,7 @@ class Component {
   static isValid(q, logger){
     let ind = q.space ? `${q.space}::${q.id}` : q.id;
 
-    let validate = validator
+    let validate = ajv
       .getSchema('https://hetalang.github.io#/definitions/' + this.schemaName);
     if (!validate) {
       throw new TypeError(`The schema "${this.schemaName}" is not found.`);

src/utils.js

@@ -5,15 +5,11 @@
 // preparation of Ajv
 
 const Ajv = require('ajv');
-
-const ajv = new Ajv({allErrors: true}); // jsonPointers: true
-require('ajv-errors')(ajv);
-
 const schema = require('./heta.json-schema');
-const validator = new Ajv({allErrors: true}) // maybe combine with previous
-  .addSchema(schema);
-require('ajv-errors')(validator);
 
+const ajv = new Ajv({allErrors: true, jsonPointers: true})
+  .addSchema(schema); // for Component instances
+require('ajv-errors')(ajv);
 
 // return array of elements by the selector
 function uniqBy(array, selector = (x) => x) {
@@ -95,7 +91,6 @@ function cloneDeep(o) {
 }
 
 module.exports = {
-  validator,
   ajv,
   uniqBy,
   intersection,