1 files changed, 35 insertions, 0 deletions
diff --git a/src/micromark-encode.ts b/src/micromark-encode.ts
new file mode 100644
index 000000000..d205d13e3
--- /dev/null
+++ b/src/micromark-encode.ts
@@ -0,0 +1,35 @@
+import type { HtmlExtension, Token, Tokenize } from 'micromark/dist/shared-types';
+
+const characterReferences = {
+  '"': 'quot',
+  '&': 'amp',
+  '<': 'lt',
+  '>': 'gt',
+  '{': 'lbrace',
+  '}': 'rbrace',
+};
+
+type EncodedChars = '"' | '&' | '<' | '>' | '{' | '}';
+
+function encode(value: string): string {
+  return value.replace(/["&<>{}]/g, (raw: string) => {
+    return '&' + characterReferences[raw as EncodedChars] + ';';
+  });
+}
+
+function encodeToken(this: Record<string, () => void>) {
+  const token: Token = arguments[0];
+  const serialize = (this.sliceSerialize as unknown) as (t: Token) => string;
+  const raw = (this.raw as unknown) as (s: string) => void;
+  const value = serialize(token);
+  raw(encode(value));
+}
+
+const plugin: HtmlExtension = {
+  exit: {
+    codeTextData: encodeToken,
+    codeFlowValue: encodeToken,
+  },
+};
+
+export { plugin as encodeMarkdown };
+\ No newline at end of file