diff --git a/tests/baselines/reference/commonSourceDirectory_dts.js b/tests/baselines/reference/commonSourceDirectory_dts.js
new file mode 100644
index 00000000000..8aa0bd04e11
--- /dev/null
+++ b/tests/baselines/reference/commonSourceDirectory_dts.js
@@ -0,0 +1,21 @@
+//// [tests/cases/compiler/commonSourceDirectory_dts.ts] ////
+
+//// [bar.d.ts]
+// Test that importing a file from `node_modules` does not affect calculation of the common source directory.
+
+declare const y: number;
+
+//// [index.ts]
+/// <reference path="../lib/bar.d.ts" />
+export const x = y;
+
+
+//// [/app/bin/index.js]
+"use strict";
+/// <reference path="../lib/bar.d.ts" />
+exports.x = y;
+//# sourceMappingURL=/app/myMapRoot/index.js.map
+
+//// [/app/bin/index.d.ts]
+/// <reference path="../lib/bar.d.ts" />
+export declare const x: number;
diff --git a/tests/baselines/reference/commonSourceDirectory_dts.js.map b/tests/baselines/reference/commonSourceDirectory_dts.js.map
new file mode 100644
index 00000000000..b33518dd04c
--- /dev/null
+++ b/tests/baselines/reference/commonSourceDirectory_dts.js.map
@@ -0,0 +1,2 @@
+//// [/app/bin/index.js.map]
+{"version":3,"file":"index.js","sourceRoot":"/app/mySourceRoot/","sources":["index.ts"],"names":[],"mappings":";AAAA,wCAAwC;AAC3B,QAAA,CAAC,GAAG,CAAC,CAAC"}
\ No newline at end of file
diff --git a/tests/baselines/reference/commonSourceDirectory_dts.sourcemap.txt b/tests/baselines/reference/commonSourceDirectory_dts.sourcemap.txt
new file mode 100644
index 00000000000..90603ae3652
--- /dev/null
+++ b/tests/baselines/reference/commonSourceDirectory_dts.sourcemap.txt
@@ -0,0 +1,42 @@
+===================================================================
+JsFile: index.js
+mapUrl: /app/myMapRoot/index.js.map
+sourceRoot: /app/mySourceRoot/
+sources: index.ts
+===================================================================
+-------------------------------------------------------------------
+emittedFile:/app/bin/index.js
+sourceFile:index.ts
+-------------------------------------------------------------------
+>>>"use strict";
+>>>/// <reference path="../lib/bar.d.ts" />
+1 >
+2 >^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+1 >
+2 >/// <reference path="../lib/bar.d.ts" />
+1 >Emitted(2, 1) Source(1, 1) + SourceIndex(0)
+2 >Emitted(2, 41) Source(1, 41) + SourceIndex(0)
+---
+>>>exports.x = y;
+1 >
+2 >^^^^^^^^
+3 >        ^
+4 >         ^^^
+5 >            ^
+6 >             ^
+7 >              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^->
+1 >
+  >export const 
+2 >
+3 >        x
+4 >          = 
+5 >            y
+6 >             ;
+1 >Emitted(3, 1) Source(2, 14) + SourceIndex(0)
+2 >Emitted(3, 9) Source(2, 14) + SourceIndex(0)
+3 >Emitted(3, 10) Source(2, 15) + SourceIndex(0)
+4 >Emitted(3, 13) Source(2, 18) + SourceIndex(0)
+5 >Emitted(3, 14) Source(2, 19) + SourceIndex(0)
+6 >Emitted(3, 15) Source(2, 20) + SourceIndex(0)
+---
+>>>//# sourceMappingURL=/app/myMapRoot/index.js.map
\ No newline at end of file
diff --git a/tests/baselines/reference/commonSourceDirectory_dts.symbols b/tests/baselines/reference/commonSourceDirectory_dts.symbols
new file mode 100644
index 00000000000..740a8aef921
--- /dev/null
+++ b/tests/baselines/reference/commonSourceDirectory_dts.symbols
@@ -0,0 +1,12 @@
+=== /app/src/index.ts ===
+/// <reference path="../lib/bar.d.ts" />
+export const x = y;
+>x : Symbol(x, Decl(index.ts, 1, 12))
+>y : Symbol(y, Decl(bar.d.ts, 2, 13))
+
+=== /app/lib/bar.d.ts ===
+// Test that importing a file from `node_modules` does not affect calculation of the common source directory.
+
+declare const y: number;
+>y : Symbol(y, Decl(bar.d.ts, 2, 13))
+
diff --git a/tests/baselines/reference/commonSourceDirectory_dts.types b/tests/baselines/reference/commonSourceDirectory_dts.types
new file mode 100644
index 00000000000..b41b91c978f
--- /dev/null
+++ b/tests/baselines/reference/commonSourceDirectory_dts.types
@@ -0,0 +1,12 @@
+=== /app/src/index.ts ===
+/// <reference path="../lib/bar.d.ts" />
+export const x = y;
+>x : number
+>y : number
+
+=== /app/lib/bar.d.ts ===
+// Test that importing a file from `node_modules` does not affect calculation of the common source directory.
+
+declare const y: number;
+>y : number
+
diff --git a/tests/cases/compiler/commonSourceDirectory_dts.ts b/tests/cases/compiler/commonSourceDirectory_dts.ts
new file mode 100644
index 00000000000..3a3dfea1772
--- /dev/null
+++ b/tests/cases/compiler/commonSourceDirectory_dts.ts
@@ -0,0 +1,22 @@
+// Test that importing a file from `node_modules` does not affect calculation of the common source directory.
+// @noImplicitReferences: true
+// @moduleResolution: node
+// @fullEmitPaths: true
+
+// @filename: /app/lib/bar.d.ts
+declare const y: number;
+
+// @filename: /app/src/index.ts
+/// <reference path="../lib/bar.d.ts" />
+export const x = y;
+
+// @filename: /app/tsconfig.json
+{
+    "compilerOptions": {
+        "outDir": "bin",
+        "sourceMap": true,
+        "mapRoot": "myMapRoot",
+        "sourceRoot": "mySourceRoot",
+        "declaration": true
+    }
+}