diff --git a/packages/entity-cache-adapter-redis/src/__tests__/GenericRedisCacher-test.ts b/packages/entity-cache-adapter-redis/src/__tests__/GenericRedisCacher-test.ts
index 2238e1ee8..37d0eab29 100644
--- a/packages/entity-cache-adapter-redis/src/__tests__/GenericRedisCacher-test.ts
+++ b/packages/entity-cache-adapter-redis/src/__tests__/GenericRedisCacher-test.ts
@@ -109,7 +109,7 @@ describe(GenericRedisCacher, () => {
           return pipeline;
         },
       );
-      when(mockPipeline.exec()).thenResolve({} as any);
+      when(mockPipeline.exec()).thenResolve([]);
       const pipeline = instance(mockPipeline);
 
       const mockRedisClient = mock<Redis>();
@@ -154,7 +154,7 @@ describe(GenericRedisCacher, () => {
           return pipeline;
         },
       );
-      when(mockPipeline.exec()).thenResolve({} as any);
+      when(mockPipeline.exec()).thenResolve([]);
       const pipeline = instance(mockPipeline);
 
       const mockRedisClient = mock<Redis>();
diff --git a/packages/entity-database-adapter-knex/src/PostgresEntityDatabaseAdapter.ts b/packages/entity-database-adapter-knex/src/PostgresEntityDatabaseAdapter.ts
index d73483390..3000decd1 100644
--- a/packages/entity-database-adapter-knex/src/PostgresEntityDatabaseAdapter.ts
+++ b/packages/entity-database-adapter-knex/src/PostgresEntityDatabaseAdapter.ts
@@ -215,10 +215,7 @@ export class PostgresEntityDatabaseAdapter<
     bindings: object | any[],
     querySelectionModifiers: TableQuerySelectionModifiersWithOrderByRaw,
   ): Promise<object[]> {
-    let query = queryInterface
-      .select()
-      .from(tableName)
-      .whereRaw(rawWhereClause, bindings as any);
+    let query = queryInterface.select().from(tableName).whereRaw(rawWhereClause, bindings);
     query = this.applyQueryModifiersToQueryOrderByRaw(query, querySelectionModifiers);
     return await wrapNativePostgresCallAsync(() => query);
   }
diff --git a/packages/entity-database-adapter-knex/src/__tests__/EntityFields-test.ts b/packages/entity-database-adapter-knex/src/__tests__/EntityFields-test.ts
index 854ff14aa..1ed258b4e 100644
--- a/packages/entity-database-adapter-knex/src/__tests__/EntityFields-test.ts
+++ b/packages/entity-database-adapter-knex/src/__tests__/EntityFields-test.ts
@@ -4,7 +4,7 @@ import { BigIntField, JSONArrayField, MaybeJSONArrayField } from '../EntityField
 
 describeFieldTestCase(
   new JSONArrayField({ columnName: 'wat' }),
-  [[[1, 2]] as any, [['hello']] as any],
+  [[[1, 2]], [['hello']]],
   [1, 'hello'],
 );
 describeFieldTestCase(
diff --git a/packages/entity-database-adapter-knex/src/__tests__/SQLOperator-test.ts b/packages/entity-database-adapter-knex/src/__tests__/SQLOperator-test.ts
index 6bdd6a38e..a6e1d2015 100644
--- a/packages/entity-database-adapter-knex/src/__tests__/SQLOperator-test.ts
+++ b/packages/entity-database-adapter-knex/src/__tests__/SQLOperator-test.ts
@@ -280,7 +280,7 @@ describe('SQLOperator', () => {
 
       it('handles non-SupportedSQLValue types gracefully', () => {
         const fragment = new SQLFragment('SELECT * FROM test WHERE field = ? AND field2 = ?', [
-          { type: 'value', value: new Error('wat') as any },
+          { type: 'value', value: new Error('wat') },
           { type: 'value', value: Object.create(null) },
         ]);
 
diff --git a/packages/entity-example/src/app.ts b/packages/entity-example/src/app.ts
index 56caecbd2..4896b0150 100644
--- a/packages/entity-example/src/app.ts
+++ b/packages/entity-example/src/app.ts
@@ -1,4 +1,4 @@
-import { ApolloServer } from '@apollo/server';
+import { ApolloServer, type BaseContext } from '@apollo/server';
 import { koaMiddleware } from '@as-integrations/koa';
 import { EntityCompanionProvider } from '@expo/entity';
 import { bodyParser } from '@koa/bodyparser';
@@ -23,6 +23,10 @@ export type ExampleState = {
   entityCompanionProvider: EntityCompanionProvider; // entityCompanionMiddleware
 };
 
+export interface GraphQLContext extends BaseContext {
+  viewerContext: ExampleViewerContext;
+}
+
 export async function createAppAsync(): Promise<Koa<ExampleState, ExampleContext>> {
   const app = new Koa<ExampleState, ExampleContext>();
 
@@ -44,15 +48,15 @@ export async function createAppAsync(): Promise<Koa<ExampleState, ExampleContext
   router.use(notesRouter.routes());
 
   // GraphQL routes
-  const server = new ApolloServer({
+  const server = new ApolloServer<GraphQLContext>({
     typeDefs,
     resolvers,
   });
   await server.start();
   router.post(
     '/graphql',
-    // https://github.com/apollographql/apollo-server/issues/7625
-    koaMiddleware(server as any, {
+    // @ts-expect-error - @as-integrations/koa peers on @apollo/server ^4 (CJS types) but we use v5 (ESM types)
+    koaMiddleware<GraphQLContext, ExampleState, ExampleContext>(server, {
       context: async ({ ctx }: { ctx: ExampleContext }) => ({
         viewerContext: ctx.state.viewerContext,
       }),
diff --git a/packages/entity/src/AuthorizationResultBasedEntityAssociationLoader.ts b/packages/entity/src/AuthorizationResultBasedEntityAssociationLoader.ts
index 72ee0dee3..5d2b6831c 100644
--- a/packages/entity/src/AuthorizationResultBasedEntityAssociationLoader.ts
+++ b/packages/entity/src/AuthorizationResultBasedEntityAssociationLoader.ts
@@ -16,7 +16,7 @@ export class AuthorizationResultBasedEntityAssociationLoader<
   TIDField extends keyof NonNullable<Pick<TFields, TSelectedFields>>,
   TViewerContext extends ViewerContext,
   TEntity extends ReadonlyEntity<TFields, TIDField, TViewerContext, TSelectedFields>,
-  TSelectedFields extends keyof TFields,
+  TSelectedFields extends keyof TFields = keyof TFields,
 > {
   constructor(
     private readonly entity: TEntity,
@@ -123,10 +123,7 @@ export class AuthorizationResultBasedEntityAssociationLoader<
       .getViewerScopedEntityCompanionForClass(associatedEntityClass)
       .getLoaderFactory()
       .forLoad(this.queryContext, { previousValue: null, cascadingDeleteCause: null });
-    return await loader.loadManyByFieldEqualingAsync(
-      associatedEntityFieldContainingThisID,
-      thisID as any,
-    );
+    return await loader.loadManyByFieldEqualingAsync(associatedEntityFieldContainingThisID, thisID);
   }
 
   /**
@@ -178,7 +175,7 @@ export class AuthorizationResultBasedEntityAssociationLoader<
       .forLoad(this.queryContext, { previousValue: null, cascadingDeleteCause: null });
     return await loader.loadByFieldEqualingAsync(
       associatedEntityLookupByField,
-      associatedFieldValue as any,
+      associatedFieldValue,
     );
   }
 
@@ -232,7 +229,7 @@ export class AuthorizationResultBasedEntityAssociationLoader<
       .forLoad(this.queryContext, { previousValue: null, cascadingDeleteCause: null });
     return await loader.loadManyByFieldEqualingAsync(
       associatedEntityLookupByField,
-      associatedFieldValue as any,
+      associatedFieldValue,
     );
   }
 
diff --git a/packages/entity/src/AuthorizationResultBasedEntityMutator.ts b/packages/entity/src/AuthorizationResultBasedEntityMutator.ts
index 0924dad60..8c6eafbf1 100644
--- a/packages/entity/src/AuthorizationResultBasedEntityMutator.ts
+++ b/packages/entity/src/AuthorizationResultBasedEntityMutator.ts
@@ -986,7 +986,7 @@ export class AuthorizationResultBasedDeleteMutator<
                 .loadManyByFieldEqualingAsync(
                   fieldName,
                   association.associatedEntityLookupByField
-                    ? entity.getField(association.associatedEntityLookupByField as any)
+                    ? entity.getField(association.associatedEntityLookupByField)
                     : entity.getID(),
                 ),
             );
diff --git a/packages/entity/src/EnforcingEntityLoader.ts b/packages/entity/src/EnforcingEntityLoader.ts
index 256b91b3c..329fb443c 100644
--- a/packages/entity/src/EnforcingEntityLoader.ts
+++ b/packages/entity/src/EnforcingEntityLoader.ts
@@ -24,7 +24,7 @@ export class EnforcingEntityLoader<
     TEntity,
     TSelectedFields
   >,
-  TSelectedFields extends keyof TFields,
+  TSelectedFields extends keyof TFields = keyof TFields,
 > {
   constructor(
     private readonly entityLoader: AuthorizationResultBasedEntityLoader<
diff --git a/packages/entity/src/EntityFieldDefinition.ts b/packages/entity/src/EntityFieldDefinition.ts
index 6da2ac033..01d5664c8 100644
--- a/packages/entity/src/EntityFieldDefinition.ts
+++ b/packages/entity/src/EntityFieldDefinition.ts
@@ -103,7 +103,7 @@ export interface EntityAssociationDefinition<
    * Field by which to load the instance of associatedEntityClass. If not provided, the
    * associatedEntityClass instance is fetched by its ID.
    */
-  associatedEntityLookupByField?: keyof TAssociatedFields;
+  associatedEntityLookupByField?: TAssociatedSelectedFields;
 
   /**
    * What action to perform on the entity at the other end of this edge when the entity on the source end of
diff --git a/packages/entity/src/__tests__/ComposedCacheAdapter-test.ts b/packages/entity/src/__tests__/ComposedCacheAdapter-test.ts
index f61dde542..286b20130 100644
--- a/packages/entity/src/__tests__/ComposedCacheAdapter-test.ts
+++ b/packages/entity/src/__tests__/ComposedCacheAdapter-test.ts
@@ -289,7 +289,7 @@ describe(ComposedEntityCacheAdapter, () => {
       const { cacheAdapter } = makeTestCacheAdapters();
       const results = await cacheAdapter.loadManyAsync(
         new SingleFieldHolder<BlahFields, 'id', 'id'>('id'),
-        [] as any,
+        [] as readonly SingleFieldValueHolder<BlahFields, 'id'>[],
       );
       expect(results.size).toBe(0);
     });
@@ -298,7 +298,7 @@ describe(ComposedEntityCacheAdapter, () => {
       const cacheAdapter = new ComposedEntityCacheAdapter<BlahFields, 'id'>([]);
       const results = await cacheAdapter.loadManyAsync(
         new SingleFieldHolder<BlahFields, 'id', 'id'>('id'),
-        [] as any,
+        [] as readonly SingleFieldValueHolder<BlahFields, 'id'>[],
       );
       expect(results.size).toBe(0);
     });
@@ -430,7 +430,7 @@ describe(ComposedEntityCacheAdapter, () => {
 
       await cacheAdapter.invalidateManyAsync(
         new SingleFieldHolder<BlahFields, 'id', 'id'>('id'),
-        [] as any,
+        [] as readonly SingleFieldValueHolder<BlahFields, 'id'>[],
       );
     });
   });
diff --git a/packages/entity/src/__tests__/EntityConfiguration-test.ts b/packages/entity/src/__tests__/EntityConfiguration-test.ts
index 48479bd05..155fe28ad 100644
--- a/packages/entity/src/__tests__/EntityConfiguration-test.ts
+++ b/packages/entity/src/__tests__/EntityConfiguration-test.ts
@@ -175,7 +175,7 @@ describe(EntityConfiguration, () => {
       ])('disallows %p as field key', (keyName) => {
         expect(
           () =>
-            new EntityConfiguration<any, 'id'>({
+            new EntityConfiguration<{ id: string }, 'id'>({
               idField: 'id',
               tableName: 'blah_table',
               schema: {
@@ -186,7 +186,7 @@ describe(EntityConfiguration, () => {
                 [keyName]: new StringField({
                   columnName: 'any',
                 }),
-              } as any,
+              },
               databaseAdapterFlavor: 'postgres',
               cacheAdapterFlavor: 'redis',
             }),
diff --git a/packages/entity/src/__tests__/EntityDatabaseAdapter-test.ts b/packages/entity/src/__tests__/EntityDatabaseAdapter-test.ts
index 0df0815aa..42f9abe1c 100644
--- a/packages/entity/src/__tests__/EntityDatabaseAdapter-test.ts
+++ b/packages/entity/src/__tests__/EntityDatabaseAdapter-test.ts
@@ -228,14 +228,14 @@ describe(EntityDatabaseAdapter, () => {
     it('transforms object', async () => {
       const queryContext = instance(mock(EntityQueryContext));
       const adapter = new TestEntityDatabaseAdapter({ insertResults: [{ string_field: 'hello' }] });
-      const result = await adapter.insertAsync(queryContext, {} as any);
+      const result = await adapter.insertAsync(queryContext, {});
       expect(result).toEqual({ stringField: 'hello' });
     });
 
     it('throws when insert result count zero', async () => {
       const queryContext = instance(mock(EntityQueryContext));
       const adapter = new TestEntityDatabaseAdapter({ insertResults: [] });
-      await expect(adapter.insertAsync(queryContext, {} as any)).rejects.toThrow(
+      await expect(adapter.insertAsync(queryContext, {})).rejects.toThrow(
         EntityDatabaseAdapterEmptyInsertResultError,
       );
     });
@@ -245,7 +245,7 @@ describe(EntityDatabaseAdapter, () => {
       const adapter = new TestEntityDatabaseAdapter({
         insertResults: [{ string_field: 'hello' }, { string_field: 'hello2' }],
       });
-      await expect(adapter.insertAsync(queryContext, {} as any)).rejects.toThrow(
+      await expect(adapter.insertAsync(queryContext, {})).rejects.toThrow(
         EntityDatabaseAdapterExcessiveInsertResultError,
       );
     });
@@ -255,16 +255,16 @@ describe(EntityDatabaseAdapter, () => {
     it('transforms object', async () => {
       const queryContext = instance(mock(EntityQueryContext));
       const adapter = new TestEntityDatabaseAdapter({ updateResults: [{ string_field: 'hello' }] });
-      const result = await adapter.updateAsync(queryContext, 'customIdField', 'wat', {} as any);
+      const result = await adapter.updateAsync(queryContext, 'customIdField', 'wat', {});
       expect(result).toEqual({ stringField: 'hello' });
     });
 
     it('throws when update result count zero', async () => {
       const queryContext = instance(mock(EntityQueryContext));
       const adapter = new TestEntityDatabaseAdapter({ updateResults: [] });
-      await expect(
-        adapter.updateAsync(queryContext, 'customIdField', 'wat', {} as any),
-      ).rejects.toThrow(EntityDatabaseAdapterEmptyUpdateResultError);
+      await expect(adapter.updateAsync(queryContext, 'customIdField', 'wat', {})).rejects.toThrow(
+        EntityDatabaseAdapterEmptyUpdateResultError,
+      );
     });
 
     it('throws when update result count greater than 1', async () => {
@@ -272,9 +272,9 @@ describe(EntityDatabaseAdapter, () => {
       const adapter = new TestEntityDatabaseAdapter({
         updateResults: [{ string_field: 'hello' }, { string_field: 'hello2' }],
       });
-      await expect(
-        adapter.updateAsync(queryContext, 'customIdField', 'wat', {} as any),
-      ).rejects.toThrow(EntityDatabaseAdapterExcessiveUpdateResultError);
+      await expect(adapter.updateAsync(queryContext, 'customIdField', 'wat', {})).rejects.toThrow(
+        EntityDatabaseAdapterExcessiveUpdateResultError,
+      );
     });
   });
 
diff --git a/packages/entity/src/errors/__tests__/EntityError-test.ts b/packages/entity/src/errors/__tests__/EntityError-test.ts
index 63e7bb2f0..bcafd1606 100644
--- a/packages/entity/src/errors/__tests__/EntityError-test.ts
+++ b/packages/entity/src/errors/__tests__/EntityError-test.ts
@@ -1,5 +1,8 @@
 import { describe, expect, it } from '@jest/globals';
+import { instance, mock } from 'ts-mockito';
 
+import { ViewerContext } from '../../ViewerContext';
+import { SimpleTestEntity } from '../../utils/__testfixtures__/SimpleTestEntity';
 import { EntityCacheAdapterTransientError } from '../EntityCacheAdapterError';
 import { EntityErrorCode, EntityErrorState } from '../EntityError';
 import { EntityInvalidFieldValueError } from '../EntityInvalidFieldValueError';
@@ -14,16 +17,21 @@ describe('EntityError subclasses', () => {
   });
 
   it('EntityNotAuthorizedError has correct state and code', () => {
-    const mockEntity = { constructor: { name: 'TestEntity' }, toString: () => 'TestEntity' } as any;
-    const mockViewerContext = { toString: () => 'TestViewer' } as any;
-    const error = new EntityNotAuthorizedError(mockEntity, mockViewerContext, 0, 0);
+    const viewerContext = instance(mock(ViewerContext));
+    const data = { id: '1' };
+    const testEntity = new SimpleTestEntity({
+      viewerContext,
+      id: 'what',
+      databaseFields: data,
+      selectedFields: data,
+    });
+    const error = new EntityNotAuthorizedError(testEntity, viewerContext, 0, 0);
     expect(error.state).toBe(EntityErrorState.PERMANENT);
     expect(error.code).toBe(EntityErrorCode.ERR_ENTITY_NOT_AUTHORIZED);
   });
 
   it('EntityInvalidFieldValueError has correct state and code', () => {
-    const mockEntityClass = { name: 'TestEntity' } as any;
-    const error = new EntityInvalidFieldValueError(mockEntityClass, 'testField', 'badValue');
+    const error = new EntityInvalidFieldValueError(SimpleTestEntity, 'id', 'badValue');
     expect(error.state).toBe(EntityErrorState.PERMANENT);
     expect(error.code).toBe(EntityErrorCode.ERR_ENTITY_INVALID_FIELD_VALUE);
   });
diff --git a/packages/entity/src/internal/EntityFieldTransformationUtils.ts b/packages/entity/src/internal/EntityFieldTransformationUtils.ts
index 25b136d53..2ac505ba7 100644
--- a/packages/entity/src/internal/EntityFieldTransformationUtils.ts
+++ b/packages/entity/src/internal/EntityFieldTransformationUtils.ts
@@ -51,7 +51,7 @@ export const transformDatabaseObjectToFields = <
   fieldTransformerMap: FieldTransformerMap,
   databaseObject: { [key: string]: any },
 ): Readonly<TFields> => {
-  const fields: TFields = {} as any;
+  const fields: Partial<TFields> = {};
   for (const k in databaseObject) {
     const val = databaseObject[k];
     const fieldsKey = entityConfiguration.dbToEntityFieldsKeyMapping.get(k);
@@ -64,7 +64,7 @@ export const transformDatabaseObjectToFields = <
       );
     }
   }
-  return fields;
+  return fields as Readonly<TFields>;
 };
 
 /**
@@ -81,7 +81,7 @@ export const transformFieldsToDatabaseObject = <
   const databaseObject: { [key: string]: any } = {};
   for (const k in fields) {
     const val = fields[k]!;
-    const databaseKey = entityConfiguration.entityToDBFieldsKeyMapping.get(k as any);
+    const databaseKey = entityConfiguration.entityToDBFieldsKeyMapping.get(k);
     invariant(databaseKey, `must be database key for field: ${k}`);
     databaseObject[databaseKey] = maybeTransformFieldValueToDatabaseValue(
       entityConfiguration,
@@ -104,7 +104,7 @@ export const transformCacheObjectToFields = <
   fieldTransformerMap: FieldTransformerMap,
   cacheObject: { [key: string]: any },
 ): Readonly<TFields> => {
-  const fields: TFields = {} as any;
+  const fields: Partial<TFields> = {};
   for (const fieldsKey in cacheObject) {
     const val = cacheObject[fieldsKey]!;
     fields[fieldsKey as keyof TFields] = maybeTransformCacheValueToFieldValue(
@@ -114,7 +114,7 @@ export const transformCacheObjectToFields = <
       val,
     );
   }
-  return fields;
+  return fields as Readonly<TFields>;
 };
 
 /**
diff --git a/packages/entity/src/internal/__tests__/EntityDataManager-test.ts b/packages/entity/src/internal/__tests__/EntityDataManager-test.ts
index 817f56aaf..a396f4413 100644
--- a/packages/entity/src/internal/__tests__/EntityDataManager-test.ts
+++ b/packages/entity/src/internal/__tests__/EntityDataManager-test.ts
@@ -1143,7 +1143,7 @@ describe(EntityDataManager, () => {
       entityDataManager.loadManyEqualingAsync(
         queryContext,
         new SingleFieldHolder<TestFields, 'customIdField', 'nullableField'>('nullableField'),
-        [new SingleFieldValueHolder(null as any)],
+        [new SingleFieldValueHolder(null)],
       ),
     ).rejects.toThrow('Invalid load: TestEntity (nullableField = null)');
 
@@ -1151,7 +1151,7 @@ describe(EntityDataManager, () => {
       entityDataManager.loadManyEqualingAsync(
         queryContext,
         new SingleFieldHolder<TestFields, 'customIdField', 'nullableField'>('nullableField'),
-        [new SingleFieldValueHolder(undefined as any)],
+        [new SingleFieldValueHolder(undefined)],
       ),
     ).rejects.toThrow('Invalid load: TestEntity (nullableField = undefined)');
   });
@@ -1187,7 +1187,7 @@ describe(EntityDataManager, () => {
         ]),
         [
           new CompositeFieldValueHolder({
-            nullableField: null as any,
+            nullableField: null,
             testIndexedField: 'unique1',
           }),
         ],
@@ -1205,7 +1205,7 @@ describe(EntityDataManager, () => {
         ]),
         [
           new CompositeFieldValueHolder({
-            nullableField: undefined as any,
+            nullableField: undefined,
             testIndexedField: 'unique1',
           }),
         ],
diff --git a/packages/entity/src/utils/EntityPrivacyUtils.ts b/packages/entity/src/utils/EntityPrivacyUtils.ts
index f3226543e..7ce8b553f 100644
--- a/packages/entity/src/utils/EntityPrivacyUtils.ts
+++ b/packages/entity/src/utils/EntityPrivacyUtils.ts
@@ -390,7 +390,7 @@ async function canViewerDeleteInternalAsync<
         const singleEntityResultToTestForInboundEdge = await loader['loadOneByFieldEqualingAsync'](
           fieldName,
           association.associatedEntityLookupByField
-            ? sourceEntity.getField(association.associatedEntityLookupByField as any)
+            ? sourceEntity.getField(association.associatedEntityLookupByField)
             : sourceEntity.getID(),
         );
         entityResultsToCheckForInboundEdge = singleEntityResultToTestForInboundEdge
@@ -400,7 +400,7 @@ async function canViewerDeleteInternalAsync<
         const entityResultsForInboundEdge = await loader.loadManyByFieldEqualingAsync(
           fieldName,
           association.associatedEntityLookupByField
-            ? sourceEntity.getField(association.associatedEntityLookupByField as any)
+            ? sourceEntity.getField(association.associatedEntityLookupByField)
             : sourceEntity.getID(),
         );
         entityResultsToCheckForInboundEdge = entityResultsForInboundEdge;