feat(anchors): remove unsupported chars from heading ids

Passed a stricter regexp to slugify, thats remove all unsupported symbols from ids

Read more about the supported characters here: https://datatracker.ietf.org/doc/html/rfc3986#section-3.5

package.json

@@ -59,7 +59,7 @@
     "markdownlint": "^0.32.1",
     "markdownlint-rule-helpers": "0.17.2",
     "sanitize-html": "^2.11.0",
-    "slugify": "1.6.5",
+    "slugify": "1.6.6",
     "svgo": "^3.2.0"
   },
   "devDependencies": {

src/transform/plugins/anchors/index.ts

@@ -3,14 +3,13 @@ import GithubSlugger from 'github-slugger';
 import StateCore from 'markdown-it/lib/rules_core/state_core';
 import Token from 'markdown-it/lib/token';
 import {escapeHtml} from 'markdown-it/lib/common/utils';
+import slugify from 'slugify';
 
 import {headingInfo} from '../../utils';
 import {MarkdownItPluginCb} from '../typings';
 
 import {CUSTOM_ID_EXCEPTION, CUSTOM_ID_REGEXP} from './constants';
 
-const slugify: (str: string, opts: {}) => string = require('slugify');
-
 function createLinkTokens(
     state: StateCore,
     id: string,
@@ -127,7 +126,7 @@ const index: MarkdownItPluginCb<Options> = (md, options) => {
                 } else {
                     id = slugify(title, {
                         lower: true,
-                        remove: /[*+~.()'"!:@`ь?]/g,
+                        remove: /[^\w\s$_\-,;=/]+/g,
                     });
                     ghId = slugger.slug(title);
                 }

test/__snapshots__/anchors.test.ts.snap

@@ -254,8 +254,8 @@ exports[`Anchors should include content by anchor in sharped path file 1`] = `
 `;
 
 exports[`Anchors should remove quotes from id 1`] = `
-<h2 id="«heading»-with-quotes">
-  <a href="link.html#«heading»-with-quotes"
+<h2 id="heading-with-quotes">
+  <a href="link.html#heading-with-quotes"
      class="yfm-anchor"
      aria-hidden="true"
   >