feat: now requires typescript argument T for input type

src/analyze.ts

@@ -5,10 +5,10 @@ import eachStringLine from './utils/each-str-line';
 import functionToString from './utils/fn-to-string';
 import stringSplit from './utils/string-split';
 
-function analyze(func: (...args: never[]) => never): IBlock[] {
+function analyze<T>(func: T): IBlock[] {
   const blocks: IBlock[] = [];
   eachStringLine(
-    babelCompilerManipulationNormalize(functionToString(func)),
+    babelCompilerManipulationNormalize(functionToString<T>(func)),
     (line, index) => {
       const caseFinder = caseRequestModeFinder(line, index);
 

src/utils/fn-to-string.ts

@@ -1,5 +1,3 @@
-export default function functionToString(
-  func: (...args: never[]) => never
-): string {
-  return func.toString().trim();
+export default function functionToString<T>(func: T): string {
+  return (func as any).toString().trim();
 }