tools: lint doc code examples in strict mode

PR-URL: https://github.com/nodejs/node/pull/21615
Refs: https://github.com/eslint/eslint-plugin-markdown#strict
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Yuta Hiroto <hello@hiroppy.me>
Reviewed-By: Minwoo Jung <minwoo@nodesource.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/.eslintrc.js b/.eslintrc.js
index c076ba7979..742f9ea6d3 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -40,6 +40,11 @@ module.exports = {
       ],
       parserOptions: { sourceType: 'module' },
     },
+    {
+      files: ['**/*.md'],
+      parserOptions: { ecmaFeatures: { impliedStrict: true } },
+      rules: { strict: 'off' },
+    },
   ],
   rules: {
     // ESLint built-in rules