diff --git a/lib/standalone/index.ts b/lib/standalone/index.ts
index 5f1fa2066..eaf2dd238 100644
--- a/lib/standalone/index.ts
+++ b/lib/standalone/index.ts
@@ -11,7 +11,7 @@ export default function standaloneCode(
   if (!ajv.opts.code.source) {
     throw new Error("moduleCode: ajv instance must have code.source option")
   }
-  const _n = ajv.scope.opts._n
+  const {_n} = ajv.scope.opts
   return typeof refsOrFunc == "function"
     ? funcExportCode(refsOrFunc.source)
     : refsOrFunc !== undefined
diff --git a/spec/after_test.ts b/spec/after_test.ts
index 64515d861..91a9fbca0 100644
--- a/spec/after_test.ts
+++ b/spec/after_test.ts
@@ -1,23 +1,31 @@
+import type Ajv from ".."
+import type {AnySchema, ErrorObject} from ".."
 import chai from "./chai"
 const should = chai.should()
 
-module.exports = {
-  error: afterError,
-  each: afterEach,
+interface TestResult {
+  validator: Ajv
+  schema: AnySchema
+  data: unknown
+  valid: boolean
+  expected: boolean
+  errors: ErrorObject[] | null
+  passed: boolean // true if valid == expected
 }
 
-export function afterError(res): void {
+export function afterError(res: TestResult): void {
   console.log("ajv options:", res.validator.opts)
 }
 
-export function afterEach(res): void {
+export function afterEach(res: TestResult): void {
   // console.log(res.errors);
   res.valid.should.be.a("boolean")
   if (res.valid === true) {
     should.equal(res.errors, null)
   } else {
-    res.errors.should.be.an("array")
-    for (const err of res.errors) {
+    const errs = res.errors as ErrorObject[]
+    errs.should.be.an("array")
+    for (const err of errs) {
       err.should.be.an("object")
     }
   }