diff --git a/jest.config.js b/jest.config.js
index a9ce717b..42d3ca5a 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -2,6 +2,10 @@ module.exports = {
   preset: 'ts-jest',
   testEnvironment: 'node',
   forceExit:true,
+  transform: {
+    "^.+\\.(t|j)sx?$": "ts-jest",
+    "^.+\\.(ts|tsx|js|jsx)$": "babel-jest"
+  },
   reporters: [
     "default",
     ["jest-html-reporters", 
diff --git a/package-lock.json b/package-lock.json
index 7de4e109..42e14f07 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4433,20 +4433,12 @@
       "dev": true
     },
     "is-ci": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/is-ci/-/is-ci-2.0.0.tgz",
-      "integrity": "sha512-YfJT7rkpQB0updsdHLGWrvhBJfcfzNNawYDNIyQXJz0IViGf75O8EBPKSdvw2rF+LGCsX4FZ8tcr3b19LcZq4w==",
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/is-ci/-/is-ci-3.0.0.tgz",
+      "integrity": "sha512-kDXyttuLeslKAHYL/K28F2YkM3x5jvFPEw3yXbRptXydjD9rpLEz+C5K5iutY9ZiUu6AP41JdvRQwF4Iqs4ZCQ==",
       "dev": true,
       "requires": {
-        "ci-info": "^2.0.0"
-      },
-      "dependencies": {
-        "ci-info": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-2.0.0.tgz",
-          "integrity": "sha512-5tK7EtrZ0N+OLFMthtqOj4fI2Jeb88C4CAZPu25LDVUgXJ0A3Js4PMGqrn0JU1W0Mh1/Z8wZzYPxqUrXeBboCQ==",
-          "dev": true
-        }
+        "ci-info": "^3.1.1"
       }
     },
     "is-core-module": {
@@ -8224,15 +8216,15 @@
       "dev": true
     },
     "ts-jest": {
-      "version": "26.5.6",
-      "resolved": "https://registry.npmjs.org/ts-jest/-/ts-jest-26.5.6.tgz",
-      "integrity": "sha512-rua+rCP8DxpA8b4DQD/6X2HQS8Zy/xzViVYfEs2OQu68tkCuKLV0Md8pmX55+W24uRIyAsf/BajRfxOs+R2MKA==",
+      "version": "27.0.0-next.12",
+      "resolved": "https://registry.npmjs.org/ts-jest/-/ts-jest-27.0.0-next.12.tgz",
+      "integrity": "sha512-Bde6QLSS8s2riYk8Aw/fpLdcSpH4dFSpY+JeRk8LQ/kvEZoSs5Gx4C8VqnugHO8CnlkOwvoSbI0PsAs8V85o3A==",
       "dev": true,
       "requires": {
         "bs-logger": "0.x",
         "buffer-from": "1.x",
         "fast-json-stable-stringify": "2.x",
-        "jest-util": "^26.1.0",
+        "jest-util": "27.0.0-next.9",
         "json5": "2.x",
         "lodash": "4.x",
         "make-error": "1.x",
@@ -8241,18 +8233,40 @@
         "yargs-parser": "20.x"
       },
       "dependencies": {
+        "@jest/types": {
+          "version": "27.2.5",
+          "resolved": "https://registry.npmjs.org/@jest/types/-/types-27.2.5.tgz",
+          "integrity": "sha512-nmuM4VuDtCZcY+eTpw+0nvstwReMsjPoj7ZR80/BbixulhLaiX+fbv8oeLW8WZlJMcsGQsTmMKT/iTZu1Uy/lQ==",
+          "dev": true,
+          "requires": {
+            "@types/istanbul-lib-coverage": "^2.0.0",
+            "@types/istanbul-reports": "^3.0.0",
+            "@types/node": "*",
+            "@types/yargs": "^16.0.0",
+            "chalk": "^4.0.0"
+          }
+        },
+        "@types/yargs": {
+          "version": "16.0.4",
+          "resolved": "https://registry.npmjs.org/@types/yargs/-/yargs-16.0.4.tgz",
+          "integrity": "sha512-T8Yc9wt/5LbJyCaLiHPReJa0kApcIgJ7Bn735GjItUfh08Z1pJvu8QZqb9s+mMvKV6WUQRV7K2R46YbjMXTTJw==",
+          "dev": true,
+          "requires": {
+            "@types/yargs-parser": "*"
+          }
+        },
         "jest-util": {
-          "version": "26.6.2",
-          "resolved": "https://registry.npmjs.org/jest-util/-/jest-util-26.6.2.tgz",
-          "integrity": "sha512-MDW0fKfsn0OI7MS7Euz6h8HNDXVQ0gaM9uW6RjfDmd1DAFcaxX9OqIakHIqhbnmF08Cf2DLDG+ulq8YQQ0Lp0Q==",
+          "version": "27.0.0-next.9",
+          "resolved": "https://registry.npmjs.org/jest-util/-/jest-util-27.0.0-next.9.tgz",
+          "integrity": "sha512-q9/hnWgFIx4Wkd/RoxoOeODL1kvwlX8+uo5fdi5oxEi7CrJIUDXS/QqICWo0GoqW4HlEgATdLmjG1gZXXDSyww==",
           "dev": true,
           "requires": {
-            "@jest/types": "^26.6.2",
+            "@jest/types": "^27.0.0-next.8",
             "@types/node": "*",
             "chalk": "^4.0.0",
             "graceful-fs": "^4.2.4",
-            "is-ci": "^2.0.0",
-            "micromatch": "^4.0.2"
+            "is-ci": "^3.0.0",
+            "picomatch": "^2.2.3"
           }
         },
         "json5": {
diff --git a/package.json b/package.json
index 2c12007e..92d54aa2 100755
--- a/package.json
+++ b/package.json
@@ -14,7 +14,7 @@
   "scripts": {
     "test": "npm run test:e2e && npm run test:typescript",
     "test:e2e": "istanbul cover tape test/index.js | tap-html --out ./tap-html.html",
-    "test:typescript": "jest --testPathPattern=test/typescript",
+    "test:typescript": "jest --config jest.config.js --testPathPattern=test/typescript",
     "automate": "node test.js",
     "build:node": "webpack --config webpack/webpack.node.js",
     "build:web": "webpack --config webpack/webpack.web.js",
@@ -90,7 +90,7 @@
     "tap-html": "^1.0.1",
     "tap-json": "1.0.0",
     "tape": "4.8.0",
-    "ts-jest": "^26.5.6",
+    "ts-jest": "^27.0.0-next.12",
     "typescript": "^4.4.3",
     "uglify-js": "2.8.29",
     "webpack": "^5.59.0",
diff --git a/tsconfig.json b/tsconfig.json
index 8c284790..950bc077 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -7,7 +7,8 @@
         "strictNullChecks": true,
         "types": ["jest"],
         "noEmit": true,
-        "forceConsistentCasingInFileNames": true
+        "forceConsistentCasingInFileNames": true,
+        "allowJs": true
     },
     "files": ["index.d.ts"]
 }