fix: ability to specify if transpiling cjs

src/cjs_parse.rs

@@ -26,10 +26,6 @@ impl ParsedSource {
   ///
   /// Note: This will panic if called on a non-script.
   pub fn analyze_cjs(&self) -> CjsAnalysis {
-    if !self.is_script() {
-      panic!("Cannot analyze non-script: {}", self.specifier())
-    }
-
     let mut visitor = CjsVisitor::default();
     match self.program_ref() {
       ProgramRef::Module(n) => visitor.visit_module(n),

src/parsed_source.rs

@@ -62,6 +62,39 @@ impl Globals {
   }
 }
 
+/// If the module is an Es module or CommonJs module.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub enum ModuleKind {
+  Esm,
+  Cjs,
+}
+
+impl ModuleKind {
+  #[inline(always)]
+  pub fn from_is_cjs(is_cjs: bool) -> Self {
+    if is_cjs {
+      ModuleKind::Cjs
+    } else {
+      ModuleKind::Esm
+    }
+  }
+
+  #[inline(always)]
+  pub fn from_is_esm(is_esm: bool) -> Self {
+    ModuleKind::from_is_cjs(!is_esm)
+  }
+
+  #[inline(always)]
+  pub fn is_cjs(&self) -> bool {
+    matches!(self, Self::Cjs)
+  }
+
+  #[inline(always)]
+  pub fn is_esm(&self) -> bool {
+    matches!(self, Self::Esm)
+  }
+}
+
 /// A reference to a Program.
 ///
 /// It is generally preferable for functions to accept this over `&Program`