fix: resolves nets ts diagnostic error handling

Author: ryanleecode

cli/resolveNets.ts

@@ -5,13 +5,40 @@ import { NetSpec } from "../nets/mod.ts"
 
 const $nets = $.record($.instance(NetSpec as new() => NetSpec, $.tuple(), (_: NetSpec) => []))
 
+const $tsDiagnostics = $.field("diagnosticCodes", $.array($.u32))
+
 export async function resolveNets(maybeNetsPath?: string): Promise<Record<string, NetSpec>> {
   const resolvedNetsPath = await resolveNetsPath(maybeNetsPath)
   if (resolvedNetsPath.endsWith(".ts")) {
     await register()
   }
   // shimmed by dnt
-  let nets = await _import(resolvedNetsPath)
+  let nets = await (async () => {
+    try {
+      return await _import(resolvedNetsPath)
+    } catch (err) {
+      let errorMessage = `Failed to import nets file ${resolvedNetsPath}`
+      if ($.is($tsDiagnostics, err)) {
+        for (const code of new Set(err.diagnosticCodes)) {
+          errorMessage += `: Typescript compiler error TS${code}`
+          switch (code) {
+            case 2305:
+              errorMessage += ": Did you forget to import from \"capi/nets\"?"
+              break
+            case 2307:
+              errorMessage +=
+                ": Did you set your tsconfig module to \"ESNext\" and moduleResolution to \"node16\"?"
+              break
+            default:
+              break
+          }
+        }
+      } else {
+        console.error(err)
+      }
+      throw new Error(errorMessage)
+    }
+  })()
   if ("default" in nets) nets = nets.default
   $.assert($nets, nets)
   for (const key in nets) nets[key]!.name = key