Use JSON + a typed wrapper instead of TS codegen (#1025)

Signed-off-by: William Woodruff <william@yossarian.net>

src/download/checksum/update-known-checksums.ts

@@ -19,16 +19,7 @@ export async function updateChecksums(
     deduplicatedEntries.set(entry.key, entry.checksum);
   }
 
-  const body = [...deduplicatedEntries.entries()]
-    .map(([key, checksum]) => `  "${key}":\n    "${checksum}"`)
-    .join(",\n");
-
-  const content =
-    "// AUTOGENERATED_DO_NOT_EDIT\n" +
-    "export const KNOWN_CHECKSUMS: { [key: string]: string } = {\n" +
-    body +
-    (body === "" ? "" : ",\n") +
-    "};\n";
+  const content = `${JSON.stringify(Object.fromEntries(deduplicatedEntries), null, 2)}\n`;
 
   await fs.writeFile(filePath, content);
 }