docs: adds markdown-it plugin to automatically set all external links…

… to _blank

config/.eleventy.cjs

@@ -4,6 +4,7 @@ const syntaxHighlight = require('@11ty/eleventy-plugin-syntaxhighlight')
 const markdownIt = require('markdown-it')
 const markdownItAnchor = require('markdown-it-anchor')
 const markdownItReplaceLink = require('markdown-it-replace-link')
+const markdownItLinkAttributes = require('markdown-it-link-attributes')
 const pluginTOC = require('eleventy-plugin-toc')
 const cheerio = require('cheerio')
 const memoize = require('lodash.memoize')
@@ -110,6 +111,15 @@ module.exports = function (eleventyConfig) {
         permalink: renderPermalink,
       })
       .use(markdownItReplaceLink)
+      .use(markdownItLinkAttributes, {
+        matcher(href) {
+          return href.match(/^https?:\/\//)
+        },
+        attrs: {
+          target: '_blank',
+          rel: 'noopener noreferrer',
+        },
+      })
   )
   eleventyConfig.addPassthroughCopy(
     buildstamp

package.json

@@ -125,8 +125,9 @@
     "lint-staged": "^13.1.2",
     "live-server": "1.2.2",
     "lodash.memoize": "^4.1.2",
-    "markdown-it-anchor": "^8.6.6",
-    "markdown-it-replace-link": "^1.2.0",
+    "markdown-it-anchor": "^8.6.5",
+    "markdown-it-link-attributes": "^4.0.1",
+    "markdown-it-replace-link": "^1.1.0",
     "mutation-observer": "^1.0.3",
     "npm-run-all": "^4.1.5",
     "postcss": "^8.4.21",

yarn.lock

@@ -1339,8 +1339,9 @@ __metadata:
     lint-staged: ^13.1.2
     live-server: 1.2.2
     lodash.memoize: ^4.1.2
-    markdown-it-anchor: ^8.6.6
-    markdown-it-replace-link: ^1.2.0
+    markdown-it-anchor: ^8.6.5
+    markdown-it-link-attributes: ^4.0.1
+    markdown-it-replace-link: ^1.1.0
     mutation-observer: ^1.0.3
     npm-run-all: ^4.1.5
     postcss: ^8.4.21
@@ -10371,7 +10372,7 @@ cors@latest:
   languageName: node
   linkType: hard
 
-"markdown-it-anchor@npm:^8.6.6":
+"markdown-it-anchor@npm:^8.6.5":
   version: 8.6.7
   resolution: "markdown-it-anchor@npm:8.6.7"
   peerDependencies:
@@ -10381,7 +10382,14 @@ cors@latest:
   languageName: node
   linkType: hard
 
-"markdown-it-replace-link@npm:^1.2.0":
+"markdown-it-link-attributes@npm:^4.0.1":
+  version: 4.0.1
+  resolution: "markdown-it-link-attributes@npm:4.0.1"
+  checksum: e859b0a3653998b7acddaf5e37052a00e940150d76b0275322e133a14179979c3516692610df75553f3b2e5d4010e1e5138f10bc85efab4768b9293a5b39f0a6
+  languageName: node
+  linkType: hard
+
+"markdown-it-replace-link@npm:^1.1.0":
   version: 1.2.0
   resolution: "markdown-it-replace-link@npm:1.2.0"
   dependencies: