diff --git a/src/getRawHeaders.test.ts b/src/get-raw-headers.test.ts
similarity index 85%
rename from src/getRawHeaders.test.ts
rename to src/get-raw-headers.test.ts
index 061918a..46de2dc 100644
--- a/src/getRawHeaders.test.ts
+++ b/src/get-raw-headers.test.ts
@@ -1,5 +1,5 @@
-import { Headers } from './Headers'
-import { getRawHeaders } from './getRawHeaders'
+import { Headers } from './headers'
+import { getRawHeaders } from './get-raw-headers'
 
 it('returns a headers objects with the raw names', () => {
   const headers = new Headers({
diff --git a/src/getRawHeaders.ts b/src/get-raw-headers.ts
similarity index 86%
rename from src/getRawHeaders.ts
rename to src/get-raw-headers.ts
index b1835f5..a502629 100644
--- a/src/getRawHeaders.ts
+++ b/src/get-raw-headers.ts
@@ -1,4 +1,4 @@
-import { RAW_HEADER_NAMES } from './Headers'
+import { RAW_HEADER_NAMES } from './headers'
 
 /**
  * Returns the object of all raw headers.
diff --git a/src/Headers.test.ts b/src/headers.test.ts
similarity index 99%
rename from src/Headers.test.ts
rename to src/headers.test.ts
index 3671ebb..4bc86ab 100644
--- a/src/Headers.test.ts
+++ b/src/headers.test.ts
@@ -1,7 +1,4 @@
-/**
- * @jest-environment jsdom
- */
-import { Headers } from './Headers'
+import { Headers } from './headers'
 
 describe('constructor()', () => {
   it('can be created without any arguments', () => {
diff --git a/src/Headers.ts b/src/headers.ts
similarity index 95%
rename from src/Headers.ts
rename to src/headers.ts
index c9794c3..aa6fcb3 100644
--- a/src/Headers.ts
+++ b/src/headers.ts
@@ -1,9 +1,9 @@
 import { splitCookiesString } from 'set-cookie-parser'
 import { HeadersList, HeadersObject } from './glossary'
-import { normalizeHeaderName } from './utils/normalizeHeaderName'
-import { normalizeHeaderValue } from './utils/normalizeHeaderValue'
-import { isValidHeaderName } from './utils/isValidHeaderName'
-import { isValidHeaderValue } from './utils/isValidHeaderValue'
+import { normalizeHeaderName } from './utils/normalize-header-name'
+import { normalizeHeaderValue } from './utils/normalize-header-value'
+import { isValidHeaderName } from './utils/is-valid-header-name'
+import { isValidHeaderValue } from './utils/is-valid-header-value'
 
 export const NORMALIZED_HEADERS: unique symbol = Symbol('normalizedHeaders')
 
diff --git a/src/index.ts b/src/index.ts
index 8f36b19..ecc9e17 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,16 +1,16 @@
-export { Headers } from './Headers'
+export { Headers } from './headers'
 
-export { getRawHeaders } from './getRawHeaders'
-export { headersToString } from './transformers/headersToString'
-export { headersToList } from './transformers/headersToList'
-export { headersToObject } from './transformers/headersToObject'
-export { stringToHeaders } from './transformers/stringToHeaders'
-export { listToHeaders } from './transformers/listToHeaders'
-export { objectToHeaders } from './transformers/objectToHeaders'
+export { getRawHeaders } from './get-raw-headers'
+export { headersToString } from './transformers/headers-to-string'
+export { headersToList } from './transformers/headers-to-list'
+export { headersToObject } from './transformers/headers-to-object'
+export { stringToHeaders } from './transformers/string-to-headers'
+export { listToHeaders } from './transformers/list-to-headers'
+export { objectToHeaders } from './transformers/object-to-headers'
 
-export { reduceHeadersObject } from './transformers/reduceHeadersObject'
-export { flattenHeadersList } from './transformers/flattenHeadersList'
-export { flattenHeadersObject } from './transformers/flattenHeadersObject'
+export { reduceHeadersObject } from './transformers/reduce-headers-object'
+export { flattenHeadersList } from './transformers/flatten-headers-list'
+export { flattenHeadersObject } from './transformers/flatten-headers-object'
 
 /* Typings */
 export type {
diff --git a/src/transformers/appendHeader.test.ts b/src/transformers/append-header.test.ts
similarity index 97%
rename from src/transformers/appendHeader.test.ts
rename to src/transformers/append-header.test.ts
index 9418ad6..b569049 100644
--- a/src/transformers/appendHeader.test.ts
+++ b/src/transformers/append-header.test.ts
@@ -1,4 +1,4 @@
-import { appendHeader } from './appendHeader'
+import { appendHeader } from './append-header'
 
 describe('appendHeader', () => {
   describe('given appending a non-existing header', () => {
diff --git a/src/transformers/appendHeader.ts b/src/transformers/append-header.ts
similarity index 100%
rename from src/transformers/appendHeader.ts
rename to src/transformers/append-header.ts
diff --git a/src/transformers/flattenHeadersList.test.ts b/src/transformers/flatten-headers-list.test.ts
similarity index 87%
rename from src/transformers/flattenHeadersList.test.ts
rename to src/transformers/flatten-headers-list.test.ts
index 700004a..484126e 100644
--- a/src/transformers/flattenHeadersList.test.ts
+++ b/src/transformers/flatten-headers-list.test.ts
@@ -1,5 +1,5 @@
 import { HeadersList } from '../glossary'
-import { flattenHeadersList } from './flattenHeadersList'
+import { flattenHeadersList } from './flatten-headers-list'
 
 describe('given a headers list', () => {
   it('flattens its multi-value headers', () => {
diff --git a/src/transformers/flattenHeadersList.ts b/src/transformers/flatten-headers-list.ts
similarity index 100%
rename from src/transformers/flattenHeadersList.ts
rename to src/transformers/flatten-headers-list.ts
diff --git a/src/transformers/flattenHeadersObject.test.ts b/src/transformers/flatten-headers-object.test.ts
similarity index 87%
rename from src/transformers/flattenHeadersObject.test.ts
rename to src/transformers/flatten-headers-object.test.ts
index 86309ba..7e56fc7 100644
--- a/src/transformers/flattenHeadersObject.test.ts
+++ b/src/transformers/flatten-headers-object.test.ts
@@ -1,4 +1,4 @@
-import { flattenHeadersObject } from './flattenHeadersObject'
+import { flattenHeadersObject } from './flatten-headers-object'
 import { HeadersObject } from '../glossary'
 
 describe('given a headers object', () => {
diff --git a/src/transformers/flattenHeadersObject.ts b/src/transformers/flatten-headers-object.ts
similarity index 85%
rename from src/transformers/flattenHeadersObject.ts
rename to src/transformers/flatten-headers-object.ts
index 6fdecbd..2bb863c 100644
--- a/src/transformers/flattenHeadersObject.ts
+++ b/src/transformers/flatten-headers-object.ts
@@ -1,5 +1,5 @@
 import { HeadersObject, FlatHeadersObject } from '../glossary'
-import { reduceHeadersObject } from './reduceHeadersObject'
+import { reduceHeadersObject } from './reduce-headers-object'
 
 export function flattenHeadersObject(
   headersObject: HeadersObject
diff --git a/src/transformers/headersToList.test.ts b/src/transformers/headers-to-list.test.ts
similarity index 92%
rename from src/transformers/headersToList.test.ts
rename to src/transformers/headers-to-list.test.ts
index e460ceb..0f25f21 100644
--- a/src/transformers/headersToList.test.ts
+++ b/src/transformers/headers-to-list.test.ts
@@ -1,7 +1,4 @@
-/**
- * @jest-environment jsdom
- */
-import { headersToList } from './headersToList'
+import { headersToList } from './headers-to-list'
 
 describe('given Headers with a single header', () => {
   it('should return its list representation', () => {
diff --git a/src/transformers/headersToList.ts b/src/transformers/headers-to-list.ts
similarity index 100%
rename from src/transformers/headersToList.ts
rename to src/transformers/headers-to-list.ts
diff --git a/src/transformers/headersToObject.node.test.ts b/src/transformers/headers-to-object.node.test.ts
similarity index 93%
rename from src/transformers/headersToObject.node.test.ts
rename to src/transformers/headers-to-object.node.test.ts
index fcf09ba..d40d40b 100644
--- a/src/transformers/headersToObject.node.test.ts
+++ b/src/transformers/headers-to-object.node.test.ts
@@ -1,8 +1,6 @@
-/**
- * @jest-environment node
- */
-import { headersToObject } from './headersToObject'
-import { Headers } from '../Headers'
+// @vitest-environment node
+import { headersToObject } from './headers-to-object'
+import { Headers } from '../headers'
 
 describe('given Headers with a single header', () => {
   it('should return that single header in an Object', () => {
diff --git a/src/transformers/headersToObject.test.ts b/src/transformers/headers-to-object.test.ts
similarity index 95%
rename from src/transformers/headersToObject.test.ts
rename to src/transformers/headers-to-object.test.ts
index 16ece02..07e1fcf 100644
--- a/src/transformers/headersToObject.test.ts
+++ b/src/transformers/headers-to-object.test.ts
@@ -1,7 +1,4 @@
-/**
- * @jest-environment jsdom
- */
-import { headersToObject } from './headersToObject'
+import { headersToObject } from './headers-to-object'
 
 describe('given Headers with a single header', () => {
   it('should return that single header in an Object', () => {
diff --git a/src/transformers/headersToObject.ts b/src/transformers/headers-to-object.ts
similarity index 100%
rename from src/transformers/headersToObject.ts
rename to src/transformers/headers-to-object.ts
diff --git a/src/transformers/headersToString.test.ts b/src/transformers/headers-to-string.test.ts
similarity index 90%
rename from src/transformers/headersToString.test.ts
rename to src/transformers/headers-to-string.test.ts
index a2ccb46..d5c0b6d 100644
--- a/src/transformers/headersToString.test.ts
+++ b/src/transformers/headers-to-string.test.ts
@@ -1,8 +1,5 @@
-/**
- * @jest-environment jsdom
- */
-import { headersToString } from './headersToString'
-import { Headers } from '../Headers'
+import { headersToString } from './headers-to-string'
+import { Headers } from '../headers'
 
 describe('headersToString', () => {
   describe('given a standard Headers instance', () => {
diff --git a/src/transformers/headersToString.ts b/src/transformers/headers-to-string.ts
similarity index 87%
rename from src/transformers/headersToString.ts
rename to src/transformers/headers-to-string.ts
index b1c9ed6..8b741a4 100644
--- a/src/transformers/headersToString.ts
+++ b/src/transformers/headers-to-string.ts
@@ -1,4 +1,4 @@
-import { headersToList } from './headersToList'
+import { headersToList } from './headers-to-list'
 
 /**
  * Converts a given `Headers` instance to its string representation.
diff --git a/src/transformers/headersToList.node.test.ts b/src/transformers/heraders-to-list.node.test.ts
similarity index 90%
rename from src/transformers/headersToList.node.test.ts
rename to src/transformers/heraders-to-list.node.test.ts
index f5ca9b7..c565b7e 100644
--- a/src/transformers/headersToList.node.test.ts
+++ b/src/transformers/heraders-to-list.node.test.ts
@@ -1,8 +1,6 @@
-/**
- * @jest-environment node
- */
-import { Headers } from '../Headers'
-import { headersToList } from './headersToList'
+// @vitest-environment node
+import { Headers } from '../headers'
+import { headersToList } from './headers-to-list'
 
 describe('given Headers with a single header', () => {
   it('should return its list representation', () => {
diff --git a/src/transformers/listToHeaders.test.ts b/src/transformers/list-to-headers.test.ts
similarity index 87%
rename from src/transformers/listToHeaders.test.ts
rename to src/transformers/list-to-headers.test.ts
index 298123d..b028627 100644
--- a/src/transformers/listToHeaders.test.ts
+++ b/src/transformers/list-to-headers.test.ts
@@ -1,5 +1,5 @@
-import { listToHeaders } from './listToHeaders'
-import { Headers } from '../Headers'
+import { listToHeaders } from './list-to-headers'
+import { Headers } from '../headers'
 import { HeadersList } from '../glossary'
 
 describe('given a list representation of headers', () => {
diff --git a/src/transformers/listToHeaders.ts b/src/transformers/list-to-headers.ts
similarity index 89%
rename from src/transformers/listToHeaders.ts
rename to src/transformers/list-to-headers.ts
index 137d8d3..927dd33 100644
--- a/src/transformers/listToHeaders.ts
+++ b/src/transformers/list-to-headers.ts
@@ -1,4 +1,4 @@
-import { Headers } from '../Headers'
+import { Headers } from '../headers'
 import { HeadersList } from '../glossary'
 
 export function listToHeaders(list: HeadersList): Headers {
diff --git a/src/transformers/objectToHeaders.test.ts b/src/transformers/object-to-headers.test.ts
similarity index 88%
rename from src/transformers/objectToHeaders.test.ts
rename to src/transformers/object-to-headers.test.ts
index c6ba86a..cc8eb9e 100644
--- a/src/transformers/objectToHeaders.test.ts
+++ b/src/transformers/object-to-headers.test.ts
@@ -1,5 +1,5 @@
-import { objectToHeaders } from './objectToHeaders'
-import { Headers } from '../Headers'
+import { objectToHeaders } from './object-to-headers'
+import { Headers } from '../headers'
 import { HeadersObject } from '../glossary'
 
 describe('given an object representation of headers', () => {
diff --git a/src/transformers/objectToHeaders.ts b/src/transformers/object-to-headers.ts
similarity index 82%
rename from src/transformers/objectToHeaders.ts
rename to src/transformers/object-to-headers.ts
index 40ba72e..54138e1 100644
--- a/src/transformers/objectToHeaders.ts
+++ b/src/transformers/object-to-headers.ts
@@ -1,5 +1,5 @@
-import { Headers } from '../Headers'
-import { reduceHeadersObject } from './reduceHeadersObject'
+import { Headers } from '../headers'
+import { reduceHeadersObject } from './reduce-headers-object'
 
 /**
  * Converts a given headers object to a new `Headers` instance.
diff --git a/src/transformers/reduceHeadersObject.test.ts b/src/transformers/reduce-headers-object.test.ts
similarity index 89%
rename from src/transformers/reduceHeadersObject.test.ts
rename to src/transformers/reduce-headers-object.test.ts
index ce124ca..bcbfab1 100644
--- a/src/transformers/reduceHeadersObject.test.ts
+++ b/src/transformers/reduce-headers-object.test.ts
@@ -1,4 +1,4 @@
-import { reduceHeadersObject } from './reduceHeadersObject'
+import { reduceHeadersObject } from './reduce-headers-object'
 import { HeadersObject } from '../glossary'
 
 test('reduces headers to lowercase headers', () => {
diff --git a/src/transformers/reduceHeadersObject.ts b/src/transformers/reduce-headers-object.ts
similarity index 100%
rename from src/transformers/reduceHeadersObject.ts
rename to src/transformers/reduce-headers-object.ts
diff --git a/src/transformers/stringToHeaders.test.ts b/src/transformers/string-to-headers.test.ts
similarity index 93%
rename from src/transformers/stringToHeaders.test.ts
rename to src/transformers/string-to-headers.test.ts
index c6e61d2..54c46ef 100644
--- a/src/transformers/stringToHeaders.test.ts
+++ b/src/transformers/string-to-headers.test.ts
@@ -1,5 +1,5 @@
-import { Headers } from '../Headers'
-import { stringToHeaders } from './stringToHeaders'
+import { Headers } from '../headers'
+import { stringToHeaders } from './string-to-headers'
 
 it('returns a Headers instance given a headers string', () => {
   const headersString = `
diff --git a/src/transformers/stringToHeaders.ts b/src/transformers/string-to-headers.ts
similarity index 93%
rename from src/transformers/stringToHeaders.ts
rename to src/transformers/string-to-headers.ts
index 3ed30aa..4c15b53 100644
--- a/src/transformers/stringToHeaders.ts
+++ b/src/transformers/string-to-headers.ts
@@ -1,4 +1,4 @@
-import { Headers } from '../Headers'
+import { Headers } from '../headers'
 
 /**
  * Converts a string representation of headers (i.e. from XMLHttpRequest)
diff --git a/src/utils/isValidHeaderName.ts b/src/utils/is-valid-header-name.ts
similarity index 100%
rename from src/utils/isValidHeaderName.ts
rename to src/utils/is-valid-header-name.ts
diff --git a/src/utils/isValidHeaderValue.ts b/src/utils/is-valid-header-value.ts
similarity index 100%
rename from src/utils/isValidHeaderValue.ts
rename to src/utils/is-valid-header-value.ts
diff --git a/src/utils/normalizeHeaderName.ts b/src/utils/normalize-header-name.ts
similarity index 100%
rename from src/utils/normalizeHeaderName.ts
rename to src/utils/normalize-header-name.ts
diff --git a/src/utils/normalizeHeaderValue.ts b/src/utils/normalize-header-value.ts
similarity index 100%
rename from src/utils/normalizeHeaderValue.ts
rename to src/utils/normalize-header-value.ts