feat(Util): escape more markdown characters

packages/discord.js/src/util/Util.js

@@ -56,15 +56,20 @@ function flatten(obj, ...props) {
 /**
  * Options used to escape markdown.
  * @typedef {Object} EscapeMarkdownOptions
- * @property {boolean} [codeBlock=true] Whether to escape code blocks or not
- * @property {boolean} [inlineCode=true] Whether to escape inline code or not
- * @property {boolean} [bold=true] Whether to escape bolds or not
- * @property {boolean} [italic=true] Whether to escape italics or not
- * @property {boolean} [underline=true] Whether to escape underlines or not
- * @property {boolean} [strikethrough=true] Whether to escape strikethroughs or not
- * @property {boolean} [spoiler=true] Whether to escape spoilers or not
- * @property {boolean} [codeBlockContent=true] Whether to escape text inside code blocks or not
- * @property {boolean} [inlineCodeContent=true] Whether to escape text inside inline code or not
+ * @property {boolean} [codeBlock=true] Whether to escape code blocks
+ * @property {boolean} [inlineCode=true] Whether to escape inline code
+ * @property {boolean} [bold=true] Whether to escape bolds
+ * @property {boolean} [italic=true] Whether to escape italics
+ * @property {boolean} [underline=true] Whether to escape underlines
+ * @property {boolean} [strikethrough=true] Whether to escape strikethroughs
+ * @property {boolean} [spoiler=true] Whether to escape spoilers
+ * @property {boolean} [codeBlockContent=true] Whether to escape text inside code blocks
+ * @property {boolean} [inlineCodeContent=true] Whether to escape text inside inline code
+ * @property {boolean} [escape=true] Whether to escape escape characters
+ * @property {boolean} [heading=false] Whether to escape headings
+ * @property {boolean} [bulletedList=false] Whether to escape bulleted lists
+ * @property {boolean} [numberedList=false] Whether to escape numbered lists
+ * @property {boolean} [maskedLink=false] Whether to escape masked links
  */
 
 /**
@@ -85,6 +90,11 @@ function escapeMarkdown(
     spoiler = true,
     codeBlockContent = true,
     inlineCodeContent = true,
+    escape = true,
+    heading = false,
+    bulletedList = false,
+    numberedList = false,
+    maskedLink = false,
   } = {},
 ) {
   if (!codeBlockContent) {
@@ -100,6 +110,11 @@ function escapeMarkdown(
           strikethrough,
           spoiler,
           inlineCodeContent,
+          escape,
+          heading,
+          bulletedList,
+          numberedList,
+          maskedLink,
         });
       })
       .join(codeBlock ? '\\`\\`\\`' : '```');
@@ -116,6 +131,11 @@ function escapeMarkdown(
           underline,
           strikethrough,
           spoiler,
+          escape,
+          heading,
+          bulletedList,
+          numberedList,
+          maskedLink,
         });
       })
       .join(inlineCode ? '\\`' : '`');
@@ -127,6 +147,11 @@ function escapeMarkdown(
   if (underline) text = escapeUnderline(text);
   if (strikethrough) text = escapeStrikethrough(text);
   if (spoiler) text = escapeSpoiler(text);
+  if (escape) text = escapeEscape(text);
+  if (heading) text = escapeHeading(text);
+  if (bulletedList) text = escapeBulletedList(text);
+  if (numberedList) text = escapeNumberedList(text);
+  if (maskedLink) text = escapeMaskedLink(text);
   return text;
 }
 
@@ -210,6 +235,51 @@ function escapeSpoiler(text) {
   return text.replaceAll('||', '\\|\\|');
 }
 
+/**
+ * Escapes escape characters in a string.
+ * @param {string} text Content to escape
+ * @returns {string}
+ */
+function escapeEscape(text) {
+  return text.replaceAll('\\', '\\\\');
+}
+
+/**
+ * Escapes heading characters in a string.
+ * @param {string} text Content to escape
+ * @returns {string}
+ */
+function escapeHeading(text) {
+  return text.replaceAll(/^( {0,2}[*-] +)?(#{1,3} )/gm, '$1\\$2');
+}
+
+/**
+ * Escapes bulleted list characters in a string.
+ * @param {string} text Content to escape
+ * @returns {string}
+ */
+function escapeBulletedList(text) {
+  return text.replaceAll(/^( *)[*-]( +)/gm, '$1\\-$2');
+}
+
+/**
+ * Escapes numbered list characters in a string.
+ * @param {string} text Content to escape
+ * @returns {string}
+ */
+function escapeNumberedList(text) {
+  return text.replaceAll(/^( *\d+)\./gm, '$1\\.');
+}
+
+/**
+ * Escapes masked link characters in a string.
+ * @param {string} text Content to escape
+ * @returns {string}
+ */
+function escapeMaskedLink(text) {
+  return text.replaceAll(/\[.+\]\(.+\)/gm, '\\$&');
+}
+
 /**
  * @typedef {Object} FetchRecommendedShardCountOptions
  * @property {number} [guildsPerShard=1000] Number of guilds assigned per shard

packages/discord.js/test/escapeMarkdown.test.js

@@ -5,6 +5,8 @@
 
 const Util = require('../src/util/Util');
 const testString = "`_Behold!_`\n||___~~***```js\n`use strict`;\nrequire('discord.js');```***~~___||";
+const testStringForums =
+  '# Title\n## Subtitle\n### Subsubtitle\n- Bullet list\n - # Title with bullet\n * Subbullet\n1. Number list\n 1. Sub number list';
 
 describe('escapeCodeblock', () => {
   test('shared', () => {
@@ -94,6 +96,48 @@ describe('escapeSpoiler', () => {
   });
 });
 
+describe('escapeHeading', () => {
+  test('shared', () => {
+    expect(Util.escapeHeading(testStringForums)).toEqual(
+      '\\# Title\n\\## Subtitle\n\\### Subsubtitle\n- Bullet list\n - \\# Title with bullet\n * Subbullet\n1. Number list\n 1. Sub number list',
+    );
+  });
+
+  test('basic', () => {
+    expect(Util.escapeHeading('# test')).toEqual('\\# test');
+  });
+});
+
+describe('escapeBulletedList', () => {
+  test('shared', () => {
+    expect(Util.escapeBulletedList(testStringForums)).toEqual(
+      '# Title\n## Subtitle\n### Subsubtitle\n\\- Bullet list\n \\- # Title with bullet\n \\* Subbullet\n1. Number list\n 1. Sub number list',
+    );
+  });
+
+  test('basic', () => {
+    expect(Util.escapeBulletedList('- test')).toEqual('\\- test');
+  });
+});
+
+describe('escapeNumberedList', () => {
+  test('shared', () => {
+    expect(Util.escapeNumberedList(testStringForums)).toEqual(
+      '# Title\n## Subtitle\n### Subsubtitle\n- Bullet list\n - # Title with bullet\n * Subbullet\n1\\. Number list\n 1\\. Sub number list',
+    );
+  });
+
+  test('basic', () => {
+    expect(Util.escapeNumberedList('1. test')).toEqual('1\\. test');
+  });
+});
+
+describe('escapeMaskedLink', () => {
+  test('basic', () => {
+    expect(Util.escapeMaskedLink('[test](https://discord.js.org)')).toEqual('\\[test](https://discord.js.org)');
+  });
+});
+
 describe('escapeMarkdown', () => {
   test('shared', () => {
     expect(Util.escapeMarkdown(testString)).toEqual(
@@ -176,7 +220,7 @@ describe('escapeMarkdown', () => {
       );
     });
 
-    test('edge-case odd number of fenses with no code block content', () => {
+    test('edge-case odd number of fences with no code block content', () => {
       expect(
         Util.escapeMarkdown('**foo** ```**bar**``` **fizz** ``` **buzz**', {
           codeBlock: false,

packages/discord.js/typings/index.d.ts

@@ -2737,6 +2737,11 @@ export function escapeItalic(text: string): string;
 export function escapeUnderline(text: string): string;
 export function escapeStrikethrough(text: string): string;
 export function escapeSpoiler(text: string): string;
+export function escapeEscape(text: string): string;
+export function escapeHeading(text: string): string;
+export function escapeBulletedList(text: string): string;
+export function escapeNumberedList(text: string): string;
+export function escapeMaskedLink(text: string): string;
 export function cleanCodeBlockContent(text: string): string;
 export function fetchRecommendedShardCount(token: string, options?: FetchRecommendedShardCountOptions): Promise<number>;
 export function flatten(obj: unknown, ...props: Record<string, boolean | string>[]): unknown;
@@ -4660,8 +4665,13 @@ export interface EscapeMarkdownOptions {
   underline?: boolean;
   strikethrough?: boolean;
   spoiler?: boolean;
-  inlineCodeContent?: boolean;
   codeBlockContent?: boolean;
+  inlineCodeContent?: boolean;
+  escape?: boolean;
+  heading?: boolean;
+  bulletedList?: boolean;
+  numberedList?: boolean;
+  maskedLink?: boolean;
 }
 
 export interface FetchApplicationCommandOptions extends BaseFetchOptions {