diff --git a/src/browser/TestUtils.test.ts b/src/browser/TestUtils.test.ts
index 1d7b81ca7..1617062dc 100644
--- a/src/browser/TestUtils.test.ts
+++ b/src/browser/TestUtils.test.ts
@@ -8,7 +8,8 @@ import { ICharacterJoinerService, ICharSizeService, ICoreBrowserService, IMouseS
 import { IRenderDimensions, IRenderer, IRequestRedrawEvent } from 'browser/renderer/shared/Types';
 import { IColorSet, ITerminal, ILinkifier2, IBrowser, IViewport, ICompositionHelper, CharacterJoinerHandler, IBufferRange, ReadonlyColorSet, IBufferElementProvider } from 'browser/Types';
 import { IBuffer, IBufferSet } from 'common/buffer/Types';
-import { IBufferLine, ICellData, IAttributeData, ICircularList, XtermListener, ICharset, ITerminalOptions, ColorIndex } from 'common/services/Types';
+import type { ICircularList } from 'common/base/CircularList';
+import { IBufferLine, ICellData, IAttributeData, XtermListener, ICharset, ITerminalOptions, ColorIndex } from 'common/services/Types';
 import { Buffer } from 'common/buffer/Buffer';
 import * as Browser from 'common/base/Platform';
 import { CoreBrowserTerminal } from 'browser/CoreBrowserTerminal';
diff --git a/src/common/REARCHITECTURE.md b/src/common/REARCHITECTURE.md
index 0802955a2..047b54555 100644
--- a/src/common/REARCHITECTURE.md
+++ b/src/common/REARCHITECTURE.md
@@ -42,13 +42,13 @@ flowchart BT
 
 | Project | Role | Notable sources |
 | --- | --- | --- |
-| `common/base` | Core utilities (lifecycle, events, platform) | `Async`, `Event`, `Lifecycle`, `Platform`, `StringBuilder`, `Version` |
+| `common/base` | Core utilities (lifecycle, events, platform) | `Async`, `Event`, `Lifecycle`, `Platform`, `StringBuilder`, `Version`, `CircularList` |
 | `common/encoding` | UTF conversion | `TextDecoder` (moved from `input/`) |
 | `common/data` | Static terminal data | `Charsets`, `EscapeSequences` |
 | `common/buffer` | Screen buffer | `Buffer`, `BufferLine`, … |
 | `common/parser` | Escape sequence parser | `EscapeSequenceParser`, … |
 | `common/input` | Keyboard / write path helpers | `Keyboard`, `WriteBuffer`, … |
-| `common/services` | DI services and shared types | `Services`, `Types`, `CircularList`, … |
+| `common/services` | DI services and shared types | `Services`, `Types`, `Color`, … |
 | `common/terminal` | Core terminal + input handler | `CoreTerminal`, `InputHandler`, `WindowsMode` |
 | `common/public` | Public API adapters | `AddonManager`, buffer API views |
 
diff --git a/src/common/services/CircularList.test.ts b/src/common/base/CircularList.test.ts
similarity index 99%
rename from src/common/services/CircularList.test.ts
rename to src/common/base/CircularList.test.ts
index 907577833..5252e3948 100644
--- a/src/common/services/CircularList.test.ts
+++ b/src/common/base/CircularList.test.ts
@@ -4,7 +4,7 @@
  */
 
 import { assert } from 'chai';
-import { CircularList } from 'common/services/CircularList';
+import { CircularList } from 'common/base/CircularList';
 
 describe('CircularList', () => {
   describe('push', () => {
diff --git a/src/common/services/CircularList.ts b/src/common/base/CircularList.ts
similarity index 91%
rename from src/common/services/CircularList.ts
rename to src/common/base/CircularList.ts
index 52626161f..3ba30fd14 100644
--- a/src/common/services/CircularList.ts
+++ b/src/common/base/CircularList.ts
@@ -3,9 +3,8 @@
  * @license MIT
  */
 
-import { ICircularList } from 'common/services/Types';
 import { Disposable } from 'common/base/Lifecycle';
-import { Emitter } from 'common/base/Event';
+import { Emitter, type IEvent } from 'common/base/Event';
 
 export interface IInsertEvent {
   index: number;
@@ -17,6 +16,28 @@ export interface IDeleteEvent {
   amount: number;
 }
 
+export interface ICircularList<T> {
+  length: number;
+  maxLength: number;
+  isFull: boolean;
+
+  onDeleteEmitter: Emitter<IDeleteEvent>;
+  onDelete: IEvent<IDeleteEvent>;
+  onInsertEmitter: Emitter<IInsertEvent>;
+  onInsert: IEvent<IInsertEvent>;
+  onTrimEmitter: Emitter<number>;
+  onTrim: IEvent<number>;
+
+  get(index: number): T | undefined;
+  set(index: number, value: T): void;
+  push(value: T): void;
+  recycle(): T;
+  pop(): T | undefined;
+  splice(start: number, deleteCount: number, ...items: T[]): void;
+  trimStart(count: number): void;
+  shiftElements(start: number, count: number, offset: number): void;
+}
+
 /**
  * Represents a circular list; a list with a maximum size that wraps around when push is called,
  * overriding values at the start of the list.
diff --git a/src/common/buffer/Buffer.test.ts b/src/common/buffer/Buffer.test.ts
index 43316089c..b324bdba8 100644
--- a/src/common/buffer/Buffer.test.ts
+++ b/src/common/buffer/Buffer.test.ts
@@ -5,7 +5,7 @@
 
 import { assert } from 'chai';
 import { Buffer } from 'common/buffer/Buffer';
-import { CircularList } from 'common/services/CircularList';
+import { CircularList } from 'common/base/CircularList';
 import { MockOptionsService, MockBufferService, MockLogService, createCellData } from 'common/terminal/TestUtils.test';
 import { BufferLine, DEFAULT_ATTR_DATA } from 'common/buffer/BufferLine';
 import { BufferLineStringCache } from 'common/buffer/BufferLineStringCache';
diff --git a/src/common/buffer/Buffer.ts b/src/common/buffer/Buffer.ts
index 8b13ae304..a466f6671 100644
--- a/src/common/buffer/Buffer.ts
+++ b/src/common/buffer/Buffer.ts
@@ -3,7 +3,7 @@
  * @license MIT
  */
 
-import { CircularList, IInsertEvent } from 'common/services/CircularList';
+import { CircularList, IInsertEvent } from 'common/base/CircularList';
 import { Disposable, toDisposable } from 'common/base/Lifecycle';
 import { IdleTaskQueue } from 'common/services/TaskQueue';
 import { IAttributeData, IBufferLine, ICellData, ICharset } from 'common/services/Types';
diff --git a/src/common/buffer/BufferReflow.ts b/src/common/buffer/BufferReflow.ts
index 8eab5fbb0..3c05b6f43 100644
--- a/src/common/buffer/BufferReflow.ts
+++ b/src/common/buffer/BufferReflow.ts
@@ -4,7 +4,7 @@
  */
 
 import { BufferLine } from 'common/buffer/BufferLine';
-import { CircularList } from 'common/services/CircularList';
+import { CircularList } from 'common/base/CircularList';
 import { IBufferLine, ICellData } from 'common/services/Types';
 
 export interface INewLayoutResult {
diff --git a/src/common/buffer/Types.ts b/src/common/buffer/Types.ts
index 5879505a9..3f240b96f 100644
--- a/src/common/buffer/Types.ts
+++ b/src/common/buffer/Types.ts
@@ -3,7 +3,8 @@
  * @license MIT
  */
 
-import { IAttributeData, ICircularList, IBufferLine, ICellData, IMarker, ICharset, IDisposable } from 'common/services/Types';
+import type { ICircularList } from 'common/base/CircularList';
+import { IAttributeData, IBufferLine, ICellData, IMarker, ICharset, IDisposable } from 'common/services/Types';
 import type { IEvent } from 'common/base/Event';
 
 // BufferIndex denotes a position in the buffer: [rowIndex, colIndex]
diff --git a/src/common/services/DecorationService.ts b/src/common/services/DecorationService.ts
index 9d3729871..a86eb5018 100644
--- a/src/common/services/DecorationService.ts
+++ b/src/common/services/DecorationService.ts
@@ -3,13 +3,13 @@
  * @license MIT
  */
 
-import type { IDeleteEvent, IInsertEvent } from 'common/services/CircularList';
+import type { ICircularList, IDeleteEvent, IInsertEvent } from 'common/base/CircularList';
 import { MicrotaskTimer } from 'common/base/Async';
 import { css } from 'common/services/Color';
 import { Disposable, DisposableStore, MutableDisposable, toDisposable } from 'common/base/Lifecycle';
 import { IBufferService, IDecorationService, IInternalDecoration, ILogService } from 'common/services/Services';
 import { SortedList } from 'common/services/SortedList';
-import { IColor, ICircularList } from 'common/services/Types';
+import { IColor } from 'common/services/Types';
 import { IDecoration, IDecorationOptions, IMarker } from '@xterm/xterm';
 import { Emitter } from 'common/base/Event';
 
diff --git a/src/common/services/Types.ts b/src/common/services/Types.ts
index 44946c9ef..282416b5c 100644
--- a/src/common/services/Types.ts
+++ b/src/common/services/Types.ts
@@ -3,13 +3,12 @@
  * @license MIT
  */
 
-import type { IDeleteEvent, IInsertEvent } from 'common/services/CircularList';
 import type { UnderlineStyle } from 'common/buffer/Constants';
 import type { IBufferSet } from 'common/buffer/Types';
 import type { IParams } from 'common/parser/Types';
 import type { IMouseStateService, ICoreService, IOptionsService, IUnicodeService } from 'common/services/Services';
 import { IFunctionIdentifier, ITerminalOptions as IPublicTerminalOptions } from '@xterm/xterm';
-import type { Emitter, IEvent } from 'common/base/Event';
+import type { IEvent } from 'common/base/Event';
 
 export type { ICharset } from 'common/data/Charsets';
 
@@ -64,28 +63,6 @@ export interface IScrollEvent {
   position: number;
 }
 
-export interface ICircularList<T> {
-  length: number;
-  maxLength: number;
-  isFull: boolean;
-
-  onDeleteEmitter: Emitter<IDeleteEvent>;
-  onDelete: IEvent<IDeleteEvent>;
-  onInsertEmitter: Emitter<IInsertEvent>;
-  onInsert: IEvent<IInsertEvent>;
-  onTrimEmitter: Emitter<number>;
-  onTrim: IEvent<number>;
-
-  get(index: number): T | undefined;
-  set(index: number, value: T): void;
-  push(value: T): void;
-  recycle(): T;
-  pop(): T | undefined;
-  splice(start: number, deleteCount: number, ...items: T[]): void;
-  trimStart(count: number): void;
-  shiftElements(start: number, count: number, offset: number): void;
-}
-
 export const enum KeyboardResultType {
   SEND_KEY,
   SELECT_ALL,