fix(core): ignore missing modules.yaml during postinstall (#15660)

packages/nx/src/lock-file/lock-file.ts

@@ -92,10 +92,12 @@ export function parseLockFile(
       return parseNpmLockfile(content);
     }
   } catch (e) {
+    if (!isPostInstallProcess()) {
       output.error({
         title: `Failed to parse ${packageManager} lockfile`,
         bodyLines: errorBodyLines(e),
       });
+    }
     return;
   }
   throw new Error(`Unknown package manager: ${packageManager}`);
@@ -153,6 +155,7 @@ export function createLockFile(
       return stringifyNpmLockfile(prunedGraph, content, normalizedPackageJson);
     }
   } catch (e) {
+    if (!isPostInstallProcess()) {
       const additionalInfo = [
         'To prevent the build from breaking we are returning the root lock file.',
       ];
@@ -165,6 +168,7 @@ export function createLockFile(
         title: 'An error occured while creating pruned lockfile',
         bodyLines: errorBodyLines(e, additionalInfo),
       });
+    }
     return content;
   }
 }
@@ -180,3 +184,10 @@ function errorBodyLines(originalError: Error, additionalInfo: string[] = []) {
     originalError.stack,
   ];
 }
+
+function isPostInstallProcess(): boolean {
+  return (
+    process.env.npm_command === 'install' &&
+    process.env.npm_lifecycle_event === 'postinstall'
+  );
+}