From 030ef9b8c89ac6013176fa7874726622cb797275 Mon Sep 17 00:00:00 2001
From: Isabel Duan <isabelduan@microsoft.com>
Date: Thu, 8 Aug 2024 09:24:42 -0700
Subject: [PATCH] update generated diagnostic messages for isolated
 declarations

---
 scripts/processDiagnosticMessages.mjs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/scripts/processDiagnosticMessages.mjs b/scripts/processDiagnosticMessages.mjs
index b3f398b802c18..ca1eef4b80382 100644
--- a/scripts/processDiagnosticMessages.mjs
+++ b/scripts/processDiagnosticMessages.mjs
@@ -93,20 +93,23 @@ function buildInfoFileOutput(messageTable, inputFilePathRel) {
         "}",
         "",
         "/** @internal */",
-        "export const Diagnostics = {",
+        "export const Diagnostics: Diagnostics = {",
     ];
+    const interfaceResult = ["\r\ninterface Diagnostics {"];
     messageTable.forEach(({ code, category, reportsUnnecessary, elidedInCompatabilityPyramid, reportsDeprecated }, name) => {
         const propName = convertPropertyName(name);
         const argReportsUnnecessary = reportsUnnecessary ? `, /*reportsUnnecessary*/ ${reportsUnnecessary}` : "";
         const argElidedInCompatabilityPyramid = elidedInCompatabilityPyramid ? `${!reportsUnnecessary ? ", /*reportsUnnecessary*/ undefined" : ""}, /*elidedInCompatabilityPyramid*/ ${elidedInCompatabilityPyramid}` : "";
         const argReportsDeprecated = reportsDeprecated ? `${!argElidedInCompatabilityPyramid ? ", /*reportsUnnecessary*/ undefined, /*elidedInCompatabilityPyramid*/ undefined" : ""}, /*reportsDeprecated*/ ${reportsDeprecated}` : "";
 
+        interfaceResult.push(`    ${propName}: DiagnosticMessage;`);
         result.push(`    ${propName}: diag(${code}, DiagnosticCategory.${category}, "${createKey(propName, code)}", ${JSON.stringify(name)}${argReportsUnnecessary}${argElidedInCompatabilityPyramid}${argReportsDeprecated}),`);
     });
 
+    interfaceResult.push("}");
     result.push("};");
 
-    return result.join("\r\n");
+    return result.join("\r\n") + interfaceResult.join("\r\n");
 }
 
 /**