start js rewriting, added todo list

src/bundle/rewriters/js.ts

@@ -1,6 +1,34 @@
-// don't do js rewriting yet
-// i'm making a benchmark on different rewriting methods
+import { parse } from "meriyah";
+import { generate } from "astring";
+import { makeTraveler } from "astravel";
+import { encodeUrl } from "./url";
+
+// i am a cat. i like to be petted. i like to be fed. i like to be
 
 export function rewriteJs(js: string, origin?: string) {
-    return js;
+    const ast = parse(js, {
+        module: true
+    });
+
+    const customTraveler = makeTraveler({
+        ImportDeclaration: (node) => {
+            node.source.value = encodeUrl(node.source.value, origin);
+        },
+
+        ImportExpression: (node) => {
+            node.source.value = encodeUrl(node.source.value, origin);
+        },
+
+        ExportAllDeclaration: (node) => {
+            node.source.value = encodeUrl(node.source.value, origin);
+        },
+
+        ExportNamedDeclaration: (node) => {
+            if (node.source) node.source.value = encodeUrl(node.source.value, origin);
+        }
+    });
+
+    customTraveler.go(ast);
+    
+    return generate(ast);
 }