diff --git a/jest.config.cjs b/jest.config.cjs
index 7250c9d..93292d2 100644
--- a/jest.config.cjs
+++ b/jest.config.cjs
@@ -10,6 +10,8 @@ const config = {
       }
     ]
   },
+  resolver: 'ts-jest-resolver',
+  testMatch: ['**/__tests__/**/*.[jt]s?(x)', '<rootDir>/{src,test}/**/?(*.)+(spec|test).[jt]s?(x)'],
   transformIgnorePatterns: ['<rootDir>/node_modules/(?!d3-\\.*|internmap)'],
   testEnvironment: 'node',
   extensionsToTreatAsEsm: ['.ts']
diff --git a/package-lock.json b/package-lock.json
index 763aac7..234de27 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -64,6 +64,7 @@
         "tinybench": "^2.5.1",
         "ts-jest": "^29.1.1",
         "ts-jest-mock-import-meta": "^1.1.0",
+        "ts-jest-resolver": "^2.0.1",
         "ts-loader": "^9.3.1",
         "tsx": "^4.6.2",
         "typedoc": "^0.23.15",
@@ -17238,6 +17239,15 @@
         "ts-jest": ">=20.0.0"
       }
     },
+    "node_modules/ts-jest-resolver": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/ts-jest-resolver/-/ts-jest-resolver-2.0.1.tgz",
+      "integrity": "sha512-FolE73BqVZCs8/RbLKxC67iaAtKpBWx7PeLKFW2zJQlOf9j851I7JRxSDenri2NFvVH3QP7v3S8q1AmL24Zb9Q==",
+      "dev": true,
+      "dependencies": {
+        "jest-resolve": "^29.5.0"
+      }
+    },
     "node_modules/ts-jest/node_modules/lru-cache": {
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-6.0.0.tgz",
diff --git a/package.json b/package.json
index 69bbbc2..3e895c1 100644
--- a/package.json
+++ b/package.json
@@ -110,6 +110,7 @@
     "tinybench": "^2.5.1",
     "ts-jest": "^29.1.1",
     "ts-jest-mock-import-meta": "^1.1.0",
+    "ts-jest-resolver": "^2.0.1",
     "ts-loader": "^9.3.1",
     "tsx": "^4.6.2",
     "typedoc": "^0.23.15",
diff --git a/src/evaluate-datum.test.js b/src/evaluate-datum.test.js
index 4defcaa..87c82b2 100644
--- a/src/evaluate-datum.test.js
+++ b/src/evaluate-datum.test.js
@@ -1,5 +1,5 @@
-import { builtInEvaluate, intervalEvaluate } from './evaluate'
 import { scaleLinear as d3ScaleLinear } from 'd3-scale'
+import { builtInEvaluate, intervalEvaluate } from './evaluate-datum.js'
 
 const width = 200
 const height = 100