From 85c7588d708cb70891f5863bc31a0903f6b71bc0 Mon Sep 17 00:00:00 2001
From: Ryan Lee <ryan@parity.io>
Date: Mon, 17 Jul 2023 16:41:12 -0400
Subject: [PATCH] fix: resolves nets ts diagnostic error handling

---
 cli/resolveNets.ts | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/cli/resolveNets.ts b/cli/resolveNets.ts
index 1d6b85b09..8174b65c7 100644
--- a/cli/resolveNets.ts
+++ b/cli/resolveNets.ts
@@ -5,19 +5,48 @@ 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 importNets(resolvedNetsPath)
   if ("default" in nets) nets = nets.default
   $.assert($nets, nets)
   for (const key in nets) nets[key]!.name = key
   return nets
 }
 
+async function importNets(netsPath: string) {
+  try {
+    return _import(netsPath)
+  } catch (err) {
+    let errorMessage = `Failed to import nets file ${netsPath}`
+    if ($.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)
+  }
+}
+
 async function resolveNetsPath(maybeNetsPath?: string): Promise<string> {
   if (maybeNetsPath) return path.resolve(maybeNetsPath)
   for (const p of ["nets.ts", "nets.js"]) {