diff --git a/jsconfig.json b/jsconfig.json
index 192df60..c802454 100644
--- a/jsconfig.json
+++ b/jsconfig.json
@@ -1,4 +1,4 @@
 {
     "exclude": ["node_modules"],
-    "include": ["src", "test", "typings"]
+    "include": ["src", "typings"]
 }
diff --git a/package.json b/package.json
index e820266..59f6a59 100644
--- a/package.json
+++ b/package.json
@@ -23,10 +23,11 @@
         "eslint-check": "eslint app.js src/**/*.js vite.config.ts test/**/*.ts",
         "eslint-fix": "eslint app.js src/**/*.js vite.config.ts test/**/*.ts --fix",
         "prettier-fix": "prettier --write .",
-        "test": "vitest run --coverage && npm run prettier-fix && npm run eslint-fix && node update-readme-with-shield-badge.js",
+        "test": "vitest run --coverage && npm run prettier-fix && npm run eslint-fix && tsc && node update-readme-with-shield-badge.js",
         "test:watch": "vitest",
         "build-docs": "rimraf docs && ./node_modules/.bin/jsdoc -c jsdoc.config.js",
-        "develop": "DEBUG=api,transformer,markdown,language node app.js & http-server test/forms -p 8081"
+        "develop": "DEBUG=api,transformer,markdown,language node app.js & http-server test/forms -p 8081",
+        "tsc": "tsc"
     },
     "repository": {
         "type": "git",
diff --git a/test/bad-external.spec.ts b/test/bad-external.spec.ts
index 0973e4e..e249609 100644
--- a/test/bad-external.spec.ts
+++ b/test/bad-external.spec.ts
@@ -1,10 +1,9 @@
 import { NAMESPACES } from '../src/transformer';
 import {
-    Document,
+    DocumentConstructor as Document,
     getTransformedForm,
     getTransformedModelDocument,
     parser,
-    XMLDocument,
 } from './shared';
 
 import type {
@@ -129,7 +128,7 @@ describe('for incompatible forms that require preprocessing', () => {
     it('preprocess fn does nothing if not provided...', async () => {
         const doc = await getTransformedModelDocument('bad-external.xml');
 
-        expect(doc).to.be.an.instanceOf(XMLDocument);
+        expect(doc).to.be.an.instanceOf(Document);
         expect(doc.getElementsByTagName('instance')).to.have.length(2);
         expect(doc.getElementById('existing')).to.not.be.null;
         expect(doc.getElementById('existing')!.getAttribute('src')).to.equal(
@@ -145,7 +144,7 @@ describe('for incompatible forms that require preprocessing', () => {
             'text/xml'
         );
 
-        expect(preprocessedModel).to.be.an.instanceOf(XMLDocument);
+        expect(preprocessedModel).to.be.an.instanceOf(Document);
         expect(
             preprocessedModel.getElementsByTagName('instance')
         ).to.have.length(4);
diff --git a/test/shared.ts b/test/shared.ts
index 41668b2..f22721d 100644
--- a/test/shared.ts
+++ b/test/shared.ts
@@ -81,15 +81,14 @@ export const getTransformedModelDocument = async (
 };
 
 /**
- * TODO: `@xmldom/xmldom` does not export `Document`. It's pretty linkely that @see {@link https://github.com/WebReflection/linkedom | `linkedom`}:
+ * TODO: `@xmldom/xmldom` does not export `Document`. It's pretty linkely that {@link https://github.com/WebReflection/linkedom linkedom}:
  *
  * 1. Does export it.
  * 2. Is a drop-in replacement for `@xmldom/xmldom`.
  * 3. Could very possibly go away soon anyway ;)
  */
-export const Document = parser.parseFromString('<a>', 'text/html').constructor;
+const document = parser.parseFromString('<a>', 'text/html');
 
-/**
- * TODO: this is at least temporarily a necessary fib.
- */
-export const XMLDocument = Document;
+export const DocumentConstructor = document.constructor;
+
+export type Document = typeof document;
diff --git a/test/tsconfig.json b/test/tsconfig.json
deleted file mode 100644
index d0791da..0000000
--- a/test/tsconfig.json
+++ /dev/null
@@ -1,4 +0,0 @@
-{
-    "extends": "../tsconfig.json",
-    "files": ["../typings/test.d.ts"]
-}
diff --git a/tsconfig.base.json b/tsconfig.base.json
new file mode 100644
index 0000000..0151e33
--- /dev/null
+++ b/tsconfig.base.json
@@ -0,0 +1,29 @@
+{
+    "compilerOptions": {
+        "allowJs": true,
+        "allowSyntheticDefaultImports": true,
+        "allowUnreachableCode": false,
+        "baseUrl": ".",
+        "checkJs": false,
+        "declaration": false,
+        "downlevelIteration": true,
+        "esModuleInterop": true,
+        "experimentalDecorators": true,
+        "forceConsistentCasingInFileNames": true,
+        "inlineSourceMap": true,
+        "lib": ["ES2018"],
+        "module": "amd",
+        "moduleResolution": "node",
+        "noEmit": true,
+        "noFallthroughCasesInSwitch": true,
+        "noUnusedLocals": true,
+        "noUnusedParameters": true,
+        "resolveJsonModule": true,
+        "skipLibCheck": true,
+        "strict": true,
+        "target": "es2018",
+        "types": ["node"]
+    },
+    "exclude": ["node_modules", "typings/test.d.ts"],
+    "include": ["src", "typings"]
+}
diff --git a/tsconfig.json b/tsconfig.json
index a78b4ab..95ac83f 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,29 +1,5 @@
 {
-    "compilerOptions": {
-        "allowJs": true,
-        "allowSyntheticDefaultImports": true,
-        "allowUnreachableCode": false,
-        "baseUrl": ".",
-        "checkJs": false,
-        "declaration": false,
-        "downlevelIteration": true,
-        "esModuleInterop": true,
-        "experimentalDecorators": true,
-        "forceConsistentCasingInFileNames": true,
-        "inlineSourceMap": true,
-        "lib": ["ES2018"],
-        "module": "amd",
-        "moduleResolution": "node",
-        "noEmit": true,
-        "noFallthroughCasesInSwitch": true,
-        "noUnusedLocals": true,
-        "noUnusedParameters": true,
-        "resolveJsonModule": true,
-        "skipLibCheck": true,
-        "strict": true,
-        "target": "es2018",
-        "types": ["node"]
-    },
-    "exclude": ["node_modules", "typings/test.d.ts"],
-    "include": ["src", "test", "typings"]
+    "extends": "./tsconfig.base.json",
+    "include": ["test", "typings"],
+    "files": ["./typings/test.d.ts"]
 }