From 1ce3a3bbe5e4eb104e1a4e545b04156309565cfc Mon Sep 17 00:00:00 2001
From: Kristiyan Kostadinov <crisbeto@users.noreply.github.com>
Date: Mon, 8 May 2023 11:20:03 +0200
Subject: [PATCH] fix(cdk/schematics): avoid throwing an error for empty
 program (#27060)

Fixes that the `ng update` schematics were throwing an error if the tsconfig doesn't match any files.

Fixes #27055.
---
 .../schematics/update-tool/utils/parse-tsconfig.ts    | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/cdk/schematics/update-tool/utils/parse-tsconfig.ts b/src/cdk/schematics/update-tool/utils/parse-tsconfig.ts
index 0a386c819ab2..e87b5a72a74c 100644
--- a/src/cdk/schematics/update-tool/utils/parse-tsconfig.ts
+++ b/src/cdk/schematics/update-tool/utils/parse-tsconfig.ts
@@ -12,6 +12,9 @@ import {FileSystemHost} from './virtual-host';
 import {dirname} from 'path';
 import {formatDiagnostics} from './diagnostics';
 
+/** Code of the error raised by TypeScript when a tsconfig doesn't match any files. */
+const NO_INPUTS_ERROR_CODE = 18003;
+
 /** Class capturing a tsconfig parse error. */
 export class TsconfigParseError extends Error {}
 
@@ -45,8 +48,12 @@ export function parseTsconfigFile(
     {},
   );
 
-  if (parsed.errors.length) {
-    throw new TsconfigParseError(formatDiagnostics(parsed.errors, fileSystem));
+  // Skip the "No inputs found..." error since we don't want to interrupt the migration if a
+  // tsconfig doesn't match a file. This will result in an empty `Program` which is still valid.
+  const errors = parsed.errors.filter(diag => diag.code !== NO_INPUTS_ERROR_CODE);
+
+  if (errors.length) {
+    throw new TsconfigParseError(formatDiagnostics(errors, fileSystem));
   }
 
   return parsed;