diff --git a/docs/rules.md b/docs/rules.md
index dab9da1..efe1076 100644
--- a/docs/rules.md
+++ b/docs/rules.md
@@ -244,7 +244,7 @@ An example rule module [is available here](https://github.com/ssube/salty-dog-oo
 ## From Path
 
 Rules may be loaded from a directory. Files with `.json` and `.yaml`/`.yml` extensions will be loaded,
-with filenames lowercased before checking.
+with file names converted to lowercase before being checked.
 
 To load a directory: `--rule-path rules/`
 
diff --git a/src/rule/SchemaRule.ts b/src/rule/SchemaRule.ts
index 7565596..1baf124 100644
--- a/src/rule/SchemaRule.ts
+++ b/src/rule/SchemaRule.ts
@@ -1,14 +1,11 @@
-import { ValidateFunction } from 'ajv';
+import { ErrorObject, ValidateFunction } from 'ajv';
 import { cloneDeep, defaultTo, isNil } from 'lodash';
 import { LogLevel } from 'noicejs';
 
 import { Rule, RuleData } from '.';
 import { hasItems } from '../utils';
-import { friendlyError } from '../utils/ajv';
-import { Visitor } from '../visitor';
+import { Visitor, VisitorError, VisitorResult } from '../visitor';
 import { VisitorContext } from '../visitor/VisitorContext';
-import { VisitorError } from '../visitor/VisitorError';
-import { VisitorResult } from '../visitor/VisitorResult';
 
 /* eslint-disable @typescript-eslint/no-explicit-any, @typescript-eslint/strict-boolean-expressions */
 
@@ -76,3 +73,22 @@ export class SchemaRule implements Rule, RuleData, Visitor {
     }
   }
 }
+
+export function friendlyError(ctx: VisitorContext, err: ErrorObject, rule: SchemaRule): VisitorError {
+  return {
+    data: {
+      err,
+      rule,
+    },
+    level: 'error',
+    msg: friendlyErrorMessage(err, rule),
+  };
+}
+
+export function friendlyErrorMessage(err: ErrorObject, rule: SchemaRule): string {
+  if (isNil(err.message)) {
+    return `${err.dataPath} ${err.keyword} at ${rule.select} for ${rule.name}`;
+  } else {
+    return `${err.dataPath} ${err.message} at ${rule.select} for ${rule.name}`;
+  }
+}
diff --git a/src/rule/index.ts b/src/rule/index.ts
index e06f392..c60fe3f 100644
--- a/src/rule/index.ts
+++ b/src/rule/index.ts
@@ -7,8 +7,8 @@ import { join } from 'path';
 import { YamlParser } from '../parser/YamlParser';
 import { readDir, readFile } from '../source';
 import { ensureArray, hasItems } from '../utils';
+import { VisitorResult } from '../visitor';
 import { VisitorContext } from '../visitor/VisitorContext';
-import { VisitorResult } from '../visitor/VisitorResult';
 import { SchemaRule } from './SchemaRule';
 
 /* eslint-disable @typescript-eslint/no-explicit-any */
diff --git a/src/utils/ajv/index.ts b/src/utils/ajv/index.ts
deleted file mode 100644
index 80d6b58..0000000
--- a/src/utils/ajv/index.ts
+++ /dev/null
@@ -1,25 +0,0 @@
-import { ErrorObject } from 'ajv';
-import { isNil } from 'lodash';
-
-import { SchemaRule } from '../../rule/SchemaRule';
-import { VisitorContext } from '../../visitor/VisitorContext';
-import { VisitorError } from '../../visitor/VisitorError';
-
-export function friendlyError(ctx: VisitorContext, err: ErrorObject, rule: SchemaRule): VisitorError {
-  return {
-    data: {
-      err,
-      rule,
-    },
-    level: 'error',
-    msg: friendlyErrorMessage(err, rule),
-  };
-}
-
-export function friendlyErrorMessage(err: ErrorObject, rule: SchemaRule): string {
-  if (isNil(err.message)) {
-    return `${err.dataPath} ${err.keyword} at ${rule.select} for ${rule.name}`;
-  } else {
-    return `${err.dataPath} ${err.message} at ${rule.select} for ${rule.name}`;
-  }
-}
diff --git a/src/visitor/VisitorContext.ts b/src/visitor/VisitorContext.ts
index b12e49f..4873b61 100644
--- a/src/visitor/VisitorContext.ts
+++ b/src/visitor/VisitorContext.ts
@@ -2,9 +2,8 @@ import Ajv from 'ajv';
 import { JSONPath } from 'jsonpath-plus';
 import { Logger } from 'noicejs';
 
+import { VisitorError, VisitorResult } from '.';
 import { doesExist, hasItems } from '../utils';
-import { VisitorError } from './VisitorError';
-import { VisitorResult } from './VisitorResult';
 
 /* eslint-disable @typescript-eslint/no-explicit-any */
 
diff --git a/src/visitor/VisitorError.ts b/src/visitor/VisitorError.ts
deleted file mode 100644
index 5263083..0000000
--- a/src/visitor/VisitorError.ts
+++ /dev/null
@@ -1,10 +0,0 @@
-import { LogLevel } from 'noicejs';
-
-/**
- * This is an runtime error, not an exception.
- */
-export interface VisitorError {
-  data: any;
-  level: LogLevel;
-  msg: string;
-}
diff --git a/src/visitor/VisitorResult.ts b/src/visitor/VisitorResult.ts
deleted file mode 100644
index d6a429f..0000000
--- a/src/visitor/VisitorResult.ts
+++ /dev/null
@@ -1,4 +0,0 @@
-export interface VisitorResult {
-  changes: ReadonlyArray<any>;
-  errors: ReadonlyArray<any>;
-}
diff --git a/src/visitor/index.ts b/src/visitor/index.ts
index 34ffd30..ea27d8a 100644
--- a/src/visitor/index.ts
+++ b/src/visitor/index.ts
@@ -1,5 +1,20 @@
+import { LogLevel } from 'noicejs';
+
 import { VisitorContext } from './VisitorContext';
-import { VisitorResult } from './VisitorResult';
+
+/**
+ * This is a runtime error, not an exception.
+ */
+export interface VisitorError {
+  data: any;
+  level: LogLevel;
+  msg: string;
+}
+
+export interface VisitorResult {
+  changes: ReadonlyArray<any>;
+  errors: ReadonlyArray<any>;
+}
 
 export interface Visitor<TResult extends VisitorResult = VisitorResult> {
   /**
diff --git a/test/rule/TestSchemaRule.ts b/test/rule/TestSchemaRule.ts
index 1c981fb..a321df3 100644
--- a/test/rule/TestSchemaRule.ts
+++ b/test/rule/TestSchemaRule.ts
@@ -2,7 +2,7 @@ import { expect } from 'chai';
 import { NullLogger } from 'noicejs';
 import { stub } from 'sinon';
 
-import { SchemaRule } from '../../src/rule/SchemaRule';
+import { friendlyError, SchemaRule } from '../../src/rule/SchemaRule';
 import { VisitorContext } from '../../src/visitor/VisitorContext';
 import { describeLeaks, itLeaks } from '../helpers/async';
 
@@ -157,3 +157,29 @@ describeLeaks('schema rule', async () => {
     expect(checkSpy, 'check spy should not have been called').to.have.callCount(0);
   });
 });
+
+describe('friendly errors', () => {
+  it('should have a message', () => {
+    const err = friendlyError(new VisitorContext({
+      innerOptions: {
+        coerce: false,
+        defaults: false,
+        mutate: false,
+      },
+      logger: NullLogger.global,
+    }), {
+      dataPath: 'test-path',
+      keyword: TEST_NAME,
+      params: { /* ? */ },
+      schemaPath: 'test-path',
+    }, new SchemaRule({
+      check: {},
+      desc: TEST_NAME,
+      level: 'info',
+      name: TEST_NAME,
+      select: '',
+      tags: [TEST_NAME],
+    }));
+    expect(err.msg).to.not.equal('');
+  });
+});
diff --git a/test/utils/ajv/TestFriendlyErrors.ts b/test/utils/ajv/TestFriendlyErrors.ts
deleted file mode 100644
index 47ad058..0000000
--- a/test/utils/ajv/TestFriendlyErrors.ts
+++ /dev/null
@@ -1,34 +0,0 @@
-import { expect } from 'chai';
-import { NullLogger } from 'noicejs';
-
-import { SchemaRule } from '../../../src/rule/SchemaRule';
-import { friendlyError } from '../../../src/utils/ajv';
-import { VisitorContext } from '../../../src/visitor/VisitorContext';
-
-const TEST_NAME = 'test';
-
-describe('friendly errors', () => {
-  it('should have a message', () => {
-    const err = friendlyError(new VisitorContext({
-      innerOptions: {
-        coerce: false,
-        defaults: false,
-        mutate: false,
-      },
-      logger: NullLogger.global,
-    }), {
-      dataPath: 'test-path',
-      keyword: TEST_NAME,
-      params: { /* ? */ },
-      schemaPath: 'test-path',
-    }, new SchemaRule({
-      check: {},
-      desc: TEST_NAME,
-      level: 'info',
-      name: TEST_NAME,
-      select: '',
-      tags: [TEST_NAME],
-    }));
-    expect(err.msg).to.not.equal('');
-  });
-});