fix: add instanceof Error checks to fix TS18046 errors

Signed-off-by: GitHub Copilot <noreply@github.com>

Author: Copilot

src/internalEnforcer.ts

@@ -33,7 +33,7 @@ export class InternalEnforcer extends CoreEnforcer {
       try {
         await this.adapter.addPolicy(sec, ptype, rule);
       } catch (e) {
-        if (e.message !== 'not implemented') {
+        if (e instanceof Error && e.message !== 'not implemented') {
           throw e;
         }
       }
@@ -70,7 +70,7 @@ export class InternalEnforcer extends CoreEnforcer {
         try {
           await (this.adapter as BatchAdapter).addPolicies(sec, ptype, rules);
         } catch (e) {
-          if (e.message !== 'not implemented') {
+          if (e instanceof Error && e.message !== 'not implemented') {
             throw e;
           }
         }
@@ -108,7 +108,7 @@ export class InternalEnforcer extends CoreEnforcer {
         try {
           await (this.adapter as UpdatableAdapter).updatePolicy(sec, ptype, oldRule, newRule);
         } catch (e) {
-          if (e.message !== 'not implemented') {
+          if (e instanceof Error && e.message !== 'not implemented') {
             throw e;
           }
         }
@@ -144,7 +144,7 @@ export class InternalEnforcer extends CoreEnforcer {
       try {
         await this.adapter.removePolicy(sec, ptype, rule);
       } catch (e) {
-        if (e.message !== 'not implemented') {
+        if (e instanceof Error && e.message !== 'not implemented') {
           throw e;
         }
       }
@@ -179,7 +179,7 @@ export class InternalEnforcer extends CoreEnforcer {
         try {
           await (this.adapter as BatchAdapter).removePolicies(sec, ptype, rules);
         } catch (e) {
-          if (e.message !== 'not implemented') {
+          if (e instanceof Error && e.message !== 'not implemented') {
             throw e;
           }
         }
@@ -212,7 +212,7 @@ export class InternalEnforcer extends CoreEnforcer {
       try {
         await this.adapter.removeFilteredPolicy(sec, ptype, fieldIndex, ...fieldValues);
       } catch (e) {
-        if (e.message !== 'not implemented') {
+        if (e instanceof Error && e.message !== 'not implemented') {
           throw e;
         }
       }

test/model/model.test.ts

@@ -56,8 +56,9 @@ test('TestLoadModelFromConfig', (done) => {
     }
 
     if (e instanceof Error) {
+      const errorMessage = e.message;
       requiredSections.forEach((n) => {
-        if (!e.message.includes(n)) {
+        if (!errorMessage.includes(n)) {
           throw new Error(`section name: ${sectionNameMap[n]} should be in message`);
         }
       });