web: Update nullable number handling

web/src/core/Operations/preprocessing.ts

@@ -1,25 +1,35 @@
-// @ts-nocheck
-
 /*
  * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
  * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
  * Released under the modified BSD license. See COPYING.md for more details.
  */
 
-import { validate } from "../Data/validate";
+import { validate, ValidationError } from "../Data/validate";
+import { UnitCommitmentScenario } from "../Data/types";
+import { migrate } from "../Data/migrate";
 
-export const preprocess = (data) => {
+export const preprocess = (
+  data: any,
+): [UnitCommitmentScenario | null, ValidationError | null] => {
   // Make a copy of the original data
   let result = JSON.parse(JSON.stringify(data));
 
+  // Run migration
+  migrate(result);
+
   // Run JSON validation and assign default values
   if (!validate(result)) {
     console.error(validate.errors);
-    throw Error("Invalid JSON");
+    return [
+      null,
+      { message: "Invalid JSON file. See console for more details." },
+    ];
   }
 
   // Expand scalars into arrays
+  // @ts-ignore
   const timeHorizon = result["Parameters"]["Time horizon (h)"];
+  // @ts-ignore
   const timeStep = result["Parameters"]["Time step (min)"];
   const T = (timeHorizon * 60) / timeStep;
   for (const busName in result["Buses"]) {
@@ -30,5 +40,7 @@ export const preprocess = (data) => {
       busData["Load (MW)"] = Array(T).fill(busLoad);
     }
   }
-  return result;
+
+  const scenario = result as unknown as UnitCommitmentScenario;
+  return [scenario, null];
 };