diff --git a/src/CharWidth.api.ts b/src/node/CharWidth.api.ts
similarity index 100%
rename from src/CharWidth.api.ts
rename to src/node/CharWidth.api.ts
diff --git a/src/node/tsconfig.json b/src/node/tsconfig.json
new file mode 100644
index 00000000..8a67624b
--- /dev/null
+++ b/src/node/tsconfig.json
@@ -0,0 +1,17 @@
+{
+  "extends": "../tsconfig-library-base",
+  "compilerOptions": {
+    "lib": [
+      "dom",
+      "es6",
+    ],
+    "outDir": "../../out",
+    "types": [
+      "../../node_modules/@types/mocha"
+    ]
+  },
+  "include": [
+    "./**/*",
+    "../../typings/xterm.d.ts"
+  ]
+}
diff --git a/src/tsconfig.json b/src/tsconfig.json
index a42c8338..7a7449a1 100644
--- a/src/tsconfig.json
+++ b/src/tsconfig.json
@@ -31,6 +31,7 @@
   "references": [
     { "path": "./common" },
     { "path": "./core" },
-    { "path": "./ui" }
+    { "path": "./ui" },
+    { "path": "./node" }
   ]
 }