diff --git a/src/compiler/preprocess/decode_sourcemap.ts b/src/compiler/preprocess/decode_sourcemap.ts
index fc63c5b9c8..c7e13c2853 100644
--- a/src/compiler/preprocess/decode_sourcemap.ts
+++ b/src/compiler/preprocess/decode_sourcemap.ts
@@ -1,5 +1,5 @@
 import { decode as decode_mappings } from 'sourcemap-codec';
-import { Processed } from '.';
+import { Processed } from './types';
 
 /**
  * Import decoded sourcemap from mozilla/source-map/SourceMapGenerator
diff --git a/src/compiler/preprocess/index.ts b/src/compiler/preprocess/index.ts
index 441a64fee8..93b48996c1 100644
--- a/src/compiler/preprocess/index.ts
+++ b/src/compiler/preprocess/index.ts
@@ -3,39 +3,7 @@ import { getLocator } from 'locate-character';
 import { MappedCode, SourceLocation, parse_attached_sourcemap, sourcemap_add_offset, combine_sourcemaps } from '../utils/mapped_code';
 import { decode_map } from './decode_sourcemap';
 import { replace_in_code, slice_source } from './replace_in_code';
-
-import { Location } from 'locate-character';
-
-export interface Source {
-	source: string;
-	get_location: (search: number) => Location;
-	file_basename: string;
-	filename: string;
-}
-
-export interface Processed {
-	code: string;
-	map?: string | object; // we are opaque with the type here to avoid dependency on the remapping module for our public types.
-	dependencies?: string[];
-	toString?: () => string;
-}
-
-export type MarkupPreprocessor = (options: {
-	content: string;
-	filename: string;
-}) => Processed | Promise<Processed>;
-
-export type Preprocessor = (options: {
-	content: string;
-	attributes: Record<string, string | boolean>;
-	filename?: string;
-}) => Processed | Promise<Processed>;
-
-export interface PreprocessorGroup {
-	markup?: MarkupPreprocessor;
-	style?: Preprocessor;
-	script?: Preprocessor;
-}
+import { MarkupPreprocessor, Source, Preprocessor, PreprocessorGroup, Processed } from './types';
 
 interface SourceUpdate {
 	string?: string;
diff --git a/src/compiler/preprocess/replace_in_code.ts b/src/compiler/preprocess/replace_in_code.ts
index 450cf05edb..9f49abb0f8 100644
--- a/src/compiler/preprocess/replace_in_code.ts
+++ b/src/compiler/preprocess/replace_in_code.ts
@@ -1,5 +1,5 @@
 import { MappedCode } from '../utils/mapped_code';
-import { Source } from '.';
+import { Source } from './types';
 
 interface Replacement {
 	offset: number;
diff --git a/src/compiler/preprocess/types.ts b/src/compiler/preprocess/types.ts
new file mode 100644
index 0000000000..06890ad7b5
--- /dev/null
+++ b/src/compiler/preprocess/types.ts
@@ -0,0 +1,32 @@
+import { Location } from 'locate-character';
+
+export interface Source {
+	source: string;
+	get_location: (search: number) => Location;
+	file_basename: string;
+	filename: string;
+}
+
+export interface Processed {
+	code: string;
+	map?: string | object; // we are opaque with the type here to avoid dependency on the remapping module for our public types.
+	dependencies?: string[];
+	toString?: () => string;
+}
+
+export type MarkupPreprocessor = (options: {
+	content: string;
+	filename: string;
+}) => Processed | Promise<Processed>;
+
+export type Preprocessor = (options: {
+	content: string;
+	attributes: Record<string, string | boolean>;
+	filename?: string;
+}) => Processed | Promise<Processed>;
+
+export interface PreprocessorGroup {
+	markup?: MarkupPreprocessor;
+	style?: Preprocessor;
+	script?: Preprocessor;
+}
diff --git a/src/compiler/utils/mapped_code.ts b/src/compiler/utils/mapped_code.ts
index deda0f1e0b..d0cab9f49f 100644
--- a/src/compiler/utils/mapped_code.ts
+++ b/src/compiler/utils/mapped_code.ts
@@ -1,7 +1,7 @@
 import { DecodedSourceMap, RawSourceMap, SourceMapLoader } from '@ampproject/remapping/dist/types/types';
 import remapping from '@ampproject/remapping';
 import { SourceMap } from 'magic-string';
-import { Source, Processed } from '../preprocess';
+import { Source, Processed } from '../preprocess/types';
 
 export type SourceLocation = {
 	line: number;