Add workaround to include file in build

src/file/paragraph/math/math-component.ts

@@ -19,3 +19,9 @@ export type MathComponent =
     | MathCurlyBrackets
     | MathAngledBrackets
     | MathSquareBrackets;
+
+// Needed because of: https://github.com/s-panferov/awesome-typescript-loader/issues/432
+/**
+ * @ignore
+ */
+export const WORKAROUND4 = "";