diff --git a/src/latex.ts b/src/latex.ts
index f1e948a..8f4cd50 100644
--- a/src/latex.ts
+++ b/src/latex.ts
@@ -346,6 +346,9 @@ const mapNode = (n: latex.Node, runs: MathRun[]): MathRun[] | false => {
   return [];
 };
 
+/**
+ * @internal
+ */
 export const parseLatex = (value: string): MathRun[][] => {
   const parsed = parseMath(value);
   const paragraphs: MathRun[][] = [[]];
diff --git a/src/utils.ts b/src/utils.ts
index 91578c8..7bdda14 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -1,7 +1,13 @@
+/**
+ * @internal
+ */
 export const unreachable = (_: never): never => {
   throw new Error("unreachable");
 };
 
+/**
+ * @internal
+ */
 export function invariant(cond: any, message: string): asserts cond {
   if (!cond) throw new Error(message);
 }
diff --git a/tsconfig.json b/tsconfig.json
index 2d34d4a..5129176 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -20,8 +20,9 @@
     "noImplicitOverride": true,
     "noFallthroughCasesInSwitch": true,
     "allowUnreachableCode": false,
-    "allowUnusedLabels": false
+    "allowUnusedLabels": false,
     // "exactOptionalPropertyTypes": true,
+    "stripInternal": true
   },
   "include": ["src"],
   "exclude": ["node_modules"]