diff --git a/.eslintrc.yml b/.eslintrc.yml
index e432150e..a635cdbb 100644
--- a/.eslintrc.yml
+++ b/.eslintrc.yml
@@ -477,11 +477,11 @@ rules:
   wrap-regex: off
   yield-star-spacing: off
 
+ignorePatterns: 'integrationTests/ts/*.ts'
 overrides:
   - files: '**/*.ts'
     parser: '@typescript-eslint/parser'
     parserOptions:
-      tsconfigRootDir: './types/'
       project: ['tsconfig.json']
     plugins:
       - '@typescript-eslint'
@@ -633,6 +633,16 @@ overrides:
       import/no-extraneous-dependencies: [error, { devDependencies: true }]
       import/no-nodejs-modules: off
       no-sync: off
+  - files: 'integrationTests/**'
+    parserOptions:
+      sourceType: script
+    rules:
+      node/no-unpublished-import: off
+      node/no-unpublished-require: off
+      node/no-sync: off
+      import/no-extraneous-dependencies: [error, { devDependencies: true }]
+      import/no-nodejs-modules: off
+      no-console: off
   - files: 'resources/**'
     parserOptions:
       sourceType: script
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index dd03c2dd..19eb72cf 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -35,6 +35,29 @@ jobs:
       - name: Lint Flow
         run: npm run check
 
+  integrationTests:
+    name: Run integration tests
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v2
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ env.NODE_VERSION_USED_FOR_DEVELOPMENT }}
+
+      # We install bunch of packages during integration tests without locking them
+      # so we skip cache action to not pollute cache for other jobs.
+      - name: Install Dependencies
+        run: npm ci
+
+      - name: Build NPM package
+        run: npm run build
+
+      - name: Run Integration Tests
+        run: npm run check:integrations
+
   coverage:
     name: Measure test coverage
     runs-on: ubuntu-latest
diff --git a/.gitignore b/.gitignore
index 39e4517a..f51d1249 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,5 +7,6 @@
 npm-debug.log
 
 dist
+integrationTmp
 node_modules
 coverage
diff --git a/integrationTests/README.md b/integrationTests/README.md
new file mode 100644
index 00000000..70644910
--- /dev/null
+++ b/integrationTests/README.md
@@ -0,0 +1 @@
+# TBD
diff --git a/integrationTests/integration-test.js b/integrationTests/integration-test.js
new file mode 100644
index 00000000..a429baad
--- /dev/null
+++ b/integrationTests/integration-test.js
@@ -0,0 +1,30 @@
+// @noflow
+
+'use strict';
+
+const fs = require('fs');
+const path = require('path');
+const childProcess = require('child_process');
+
+const { describe, it } = require('mocha');
+
+function exec(command, options = {}) {
+  return childProcess.execSync(command, {
+    stdio: 'inherit',
+    ...options,
+  });
+}
+
+describe('Integration Tests', () => {
+  const tmpDir = path.resolve('./integrationTmp');
+  fs.rmdirSync(tmpDir, { recursive: true });
+  fs.mkdirSync(tmpDir);
+
+  it('Should compile with all supported TS versions', () => {
+    exec(`cp -R ${path.join(__dirname, 'ts')} ${tmpDir}`);
+
+    const cwd = path.join(tmpDir, 'ts');
+    exec('npm install --silent', { cwd });
+    exec('npm test', { cwd });
+  }).timeout(40000);
+});
diff --git a/types/test.ts b/integrationTests/ts/index.ts
similarity index 100%
rename from types/test.ts
rename to integrationTests/ts/index.ts
diff --git a/integrationTests/ts/package.json b/integrationTests/ts/package.json
new file mode 100644
index 00000000..b0e1faeb
--- /dev/null
+++ b/integrationTests/ts/package.json
@@ -0,0 +1,19 @@
+{
+  "scripts": {
+    "test": "node test.js"
+  },
+  "dependencies": {
+    "@types/node": "14.0.13",
+    "express-graphql": "file:../../dist",
+    "typescript-3.0": "npm:typescript@3.0.x",
+    "typescript-3.1": "npm:typescript@3.1.x",
+    "typescript-3.2": "npm:typescript@3.2.x",
+    "typescript-3.3": "npm:typescript@3.3.x",
+    "typescript-3.4": "npm:typescript@3.4.x",
+    "typescript-3.5": "npm:typescript@3.5.x",
+    "typescript-3.6": "npm:typescript@3.6.x",
+    "typescript-3.7": "npm:typescript@3.7.x",
+    "typescript-3.8": "npm:typescript@3.8.x",
+    "typescript-3.9": "npm:typescript@3.9.x"
+  }
+}
diff --git a/integrationTests/ts/test.js b/integrationTests/ts/test.js
new file mode 100644
index 00000000..a8bd1ef9
--- /dev/null
+++ b/integrationTests/ts/test.js
@@ -0,0 +1,19 @@
+// @noflow
+
+'use strict';
+
+const path = require('path');
+const childProcess = require('child_process');
+
+const { dependencies } = require('./package.json');
+
+const tsVersions = Object.keys(dependencies)
+  .filter((pkg) => pkg.startsWith('typescript-'))
+  .sort((a, b) => b.localeCompare(a));
+
+for (const version of tsVersions) {
+  console.log(`Testing on ${version} ...`);
+
+  const tscPath = path.join(__dirname, 'node_modules', version, 'bin/tsc');
+  childProcess.execSync(tscPath, { stdio: 'inherit' });
+}
diff --git a/integrationTests/ts/tsconfig.json b/integrationTests/ts/tsconfig.json
new file mode 100644
index 00000000..4f469389
--- /dev/null
+++ b/integrationTests/ts/tsconfig.json
@@ -0,0 +1,8 @@
+{
+  "compilerOptions": {
+    "module": "commonjs",
+    "lib": ["es6", "esnext.asynciterable"],
+    "strict": true,
+    "noEmit": true
+  }
+}
diff --git a/package-lock.json b/package-lock.json
index 5bf754b2..3ae193a6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -996,58 +996,6 @@
         "to-fast-properties": "^2.0.0"
       }
     },
-    "@definitelytyped/header-parser": {
-      "version": "0.0.39",
-      "resolved": "https://registry.npmjs.org/@definitelytyped/header-parser/-/header-parser-0.0.39.tgz",
-      "integrity": "sha512-AbE+eDfG/8kIyy182xbHVfqR4Ee9FV8PfVrZZaZfpiivQJcI/kch3zih7sFIVJAiNcynxkyClKgp93Kgf4/5+w==",
-      "dev": true,
-      "requires": {
-        "@definitelytyped/typescript-versions": "^0.0.39",
-        "@types/parsimmon": "^1.10.1",
-        "parsimmon": "^1.13.0"
-      }
-    },
-    "@definitelytyped/typescript-versions": {
-      "version": "0.0.39",
-      "resolved": "https://registry.npmjs.org/@definitelytyped/typescript-versions/-/typescript-versions-0.0.39.tgz",
-      "integrity": "sha512-lUO5E7D57zvD+F/JfRswNXmMI39dtx0r+dVQ46k2k/mPazvFBGT+WLwXIVoWK5gDy4dUoKvXtgfyMvTdasYcOA==",
-      "dev": true
-    },
-    "@definitelytyped/utils": {
-      "version": "0.0.39",
-      "resolved": "https://registry.npmjs.org/@definitelytyped/utils/-/utils-0.0.39.tgz",
-      "integrity": "sha512-ErdxMYvT3xGqoFLHFYwLAJ4o0I2tSAc6vz4l/0QG3DEv/RR9vS886DnpBqtYDmOhSh6EkjrgIh6IK2yJdL7xNA==",
-      "dev": true,
-      "requires": {
-        "@definitelytyped/typescript-versions": "^0.0.39",
-        "@types/node": "^12.12.29",
-        "charm": "^1.0.2",
-        "fs-extra": "^8.1.0",
-        "fstream": "^1.0.12",
-        "npm-registry-client": "^8.6.0",
-        "tar": "^2.2.2",
-        "tar-stream": "1.6.2"
-      },
-      "dependencies": {
-        "@types/node": {
-          "version": "12.12.47",
-          "resolved": "https://registry.npmjs.org/@types/node/-/node-12.12.47.tgz",
-          "integrity": "sha512-yzBInQFhdY8kaZmqoL2+3U5dSTMrKaYcb561VU+lDzAYvqt+2lojvBEy+hmpSNuXnPTx7m9+04CzWYOUqWME2A==",
-          "dev": true
-        },
-        "fs-extra": {
-          "version": "8.1.0",
-          "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-8.1.0.tgz",
-          "integrity": "sha512-yhlQgA6mnOJUKOsRUFsgJdQCvkKhcz8tlZG5HBQfReYZy46OwLcY+Zia0mtdHsOo9y/hP+CxMN0TU9QxoOtG4g==",
-          "dev": true,
-          "requires": {
-            "graceful-fs": "^4.2.0",
-            "jsonfile": "^4.0.0",
-            "universalify": "^0.1.0"
-          }
-        }
-      }
-    },
     "@istanbuljs/load-nyc-config": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/@istanbuljs/load-nyc-config/-/load-nyc-config-1.1.0.tgz",
@@ -1193,12 +1141,6 @@
       "integrity": "sha512-lCvvI24L21ZVeIiyIUHZ5Oflv1hhHQ5E1S25IRlKIXaRkVgmXpJMI3wUJkmym2bTbCe+WoIibQnMVAU3FguaOg==",
       "dev": true
     },
-    "@types/parsimmon": {
-      "version": "1.10.2",
-      "resolved": "https://registry.npmjs.org/@types/parsimmon/-/parsimmon-1.10.2.tgz",
-      "integrity": "sha512-WVugAiBoLsmay9IPrLJoMnmLTP0cWPbc4w5c5suTevyhaJW9TWGyPbkFraNUk5YULf8vQ5C/3NBEQcIs6XfTcg==",
-      "dev": true
-    },
     "@typescript-eslint/eslint-plugin": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/@typescript-eslint/eslint-plugin/-/eslint-plugin-3.1.0.tgz",
@@ -1373,30 +1315,12 @@
         "default-require-extensions": "^3.0.0"
       }
     },
-    "aproba": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/aproba/-/aproba-1.2.0.tgz",
-      "integrity": "sha512-Y9J6ZjXtoYh8RnXVCMOU/ttDmk1aBjunq9vO0ta5x85WDQiQfUF9sIPBITdbiiIVcBo03Hi3jMxigBtsddlXRw==",
-      "dev": true,
-      "optional": true
-    },
     "archy": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/archy/-/archy-1.0.0.tgz",
       "integrity": "sha1-+cjBN1fMHde8N5rHeyxipcKGjEA=",
       "dev": true
     },
-    "are-we-there-yet": {
-      "version": "1.1.5",
-      "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.1.5.tgz",
-      "integrity": "sha512-5hYdAkZlcG8tOLujVDTgCT+uPX0VnpAH28gWsLfzpXYm7wP6mp5Q/gYyR7YQ0cKVJcXJnl3j2kpBan13PtQf6w==",
-      "dev": true,
-      "optional": true,
-      "requires": {
-        "delegates": "^1.0.0",
-        "readable-stream": "^2.0.6"
-      }
-    },
     "argparse": {
       "version": "1.0.10",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
@@ -1433,15 +1357,6 @@
         "es-abstract": "^1.17.0-next.1"
       }
     },
-    "asn1": {
-      "version": "0.2.4",
-      "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.4.tgz",
-      "integrity": "sha512-jxwzQpLQjSmWXgwaCZE9Nz+glAG01yF1QnWgbhGwHI5A6FRIEY6IVqtHhIepHqI7/kyEyQEagBC5mBEFlIYvdg==",
-      "dev": true,
-      "requires": {
-        "safer-buffer": "~2.1.0"
-      }
-    },
     "assert-plus": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
@@ -1466,62 +1381,6 @@
       "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k=",
       "dev": true
     },
-    "aws-sign2": {
-      "version": "0.7.0",
-      "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.7.0.tgz",
-      "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg=",
-      "dev": true
-    },
-    "aws4": {
-      "version": "1.10.0",
-      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.10.0.tgz",
-      "integrity": "sha512-3YDiu347mtVtjpyV3u5kVqQLP242c06zwDOgpeRnybmXlYYsLbtTrUBUm8i8srONt+FWobl5aibnU1030PeeuA==",
-      "dev": true
-    },
-    "babel-code-frame": {
-      "version": "6.26.0",
-      "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.26.0.tgz",
-      "integrity": "sha1-Y/1D99weO7fONZR9uP42mj9Yx0s=",
-      "dev": true,
-      "requires": {
-        "chalk": "^1.1.3",
-        "esutils": "^2.0.2",
-        "js-tokens": "^3.0.2"
-      },
-      "dependencies": {
-        "ansi-styles": {
-          "version": "2.2.1",
-          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
-          "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
-          "dev": true
-        },
-        "chalk": {
-          "version": "1.1.3",
-          "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
-          "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
-          "dev": true,
-          "requires": {
-            "ansi-styles": "^2.2.1",
-            "escape-string-regexp": "^1.0.2",
-            "has-ansi": "^2.0.0",
-            "strip-ansi": "^3.0.0",
-            "supports-color": "^2.0.0"
-          }
-        },
-        "js-tokens": {
-          "version": "3.0.2",
-          "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-3.0.2.tgz",
-          "integrity": "sha1-mGbfOVECEw449/mWvOtlRDIJwls=",
-          "dev": true
-        },
-        "supports-color": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
-          "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
-          "dev": true
-        }
-      }
-    },
     "babel-eslint": {
       "version": "10.1.0",
       "resolved": "https://registry.npmjs.org/babel-eslint/-/babel-eslint-10.1.0.tgz",
@@ -1560,40 +1419,12 @@
       "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
       "dev": true
     },
-    "bcrypt-pbkdf": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.2.tgz",
-      "integrity": "sha1-pDAdOJtqQ/m2f/PKEaP2Y342Dp4=",
-      "dev": true,
-      "requires": {
-        "tweetnacl": "^0.14.3"
-      }
-    },
     "binary-extensions": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.0.0.tgz",
       "integrity": "sha512-Phlt0plgpIIBOGTT/ehfFnbNlfsDEiqmzE2KRXoX1bLIlir4X/MR+zSyBEkL05ffWgnRSf/DXv+WrUAVr93/ow==",
       "dev": true
     },
-    "bl": {
-      "version": "1.2.2",
-      "resolved": "https://registry.npmjs.org/bl/-/bl-1.2.2.tgz",
-      "integrity": "sha512-e8tQYnZodmebYDWGH7KMRvtzKXaJHx3BbilrgZCfvyLUYdKpK1t5PSPmpkny/SgiTSCnjfLW7v5rlONXVFkQEA==",
-      "dev": true,
-      "requires": {
-        "readable-stream": "^2.3.5",
-        "safe-buffer": "^5.1.1"
-      }
-    },
-    "block-stream": {
-      "version": "0.0.9",
-      "resolved": "https://registry.npmjs.org/block-stream/-/block-stream-0.0.9.tgz",
-      "integrity": "sha1-E+v+d4oDIFz+A3UUgeu0szAMEmo=",
-      "dev": true,
-      "requires": {
-        "inherits": "~2.0.0"
-      }
-    },
     "body-parser": {
       "version": "1.19.0",
       "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.19.0.tgz",
@@ -1697,46 +1528,12 @@
         "pkg-up": "^2.0.0"
       }
     },
-    "buffer-alloc": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/buffer-alloc/-/buffer-alloc-1.2.0.tgz",
-      "integrity": "sha512-CFsHQgjtW1UChdXgbyJGtnm+O/uLQeZdtbDo8mfUgYXCHSM1wgrVxXm6bSyrUuErEb+4sYVGCzASBRot7zyrow==",
-      "dev": true,
-      "requires": {
-        "buffer-alloc-unsafe": "^1.1.0",
-        "buffer-fill": "^1.0.0"
-      }
-    },
-    "buffer-alloc-unsafe": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/buffer-alloc-unsafe/-/buffer-alloc-unsafe-1.1.0.tgz",
-      "integrity": "sha512-TEM2iMIEQdJ2yjPJoSIsldnleVaAk1oW3DBVUykyOLsEsFmEc9kn+SFFPz+gl54KQNxlDnAwCXosOS9Okx2xAg==",
-      "dev": true
-    },
-    "buffer-fill": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/buffer-fill/-/buffer-fill-1.0.0.tgz",
-      "integrity": "sha1-+PeLdniYiO858gXNY39o5wISKyw=",
-      "dev": true
-    },
     "buffer-from": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.1.tgz",
       "integrity": "sha512-MQcXEUbCKtEo7bhqEs6560Hyd4XaovZlO/k9V3hjVUF/zwW7KBVdSK4gIt/bzwS9MbR5qob+F5jusZsb0YQK2A==",
       "dev": true
     },
-    "builtin-modules": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/builtin-modules/-/builtin-modules-1.1.1.tgz",
-      "integrity": "sha1-Jw8HbFpywC9bZaR9+Uxf46J4iS8=",
-      "dev": true
-    },
-    "builtins": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/builtins/-/builtins-1.0.3.tgz",
-      "integrity": "sha1-y5T662HIaWRR2zZTThQi+U8K7og=",
-      "dev": true
-    },
     "bunyan": {
       "version": "1.8.12",
       "resolved": "https://registry.npmjs.org/bunyan/-/bunyan-1.8.12.tgz",
@@ -1837,12 +1634,6 @@
       "integrity": "sha512-CnYJ27awX4h7yj5glfK7r1TOI13LBytpLzEgfj0s4mY75/F8pnQcYjL+oVpmS38FB59+vU0gscQ9D8tc+lIXvA==",
       "dev": true
     },
-    "caseless": {
-      "version": "0.12.0",
-      "resolved": "https://registry.npmjs.org/caseless/-/caseless-0.12.0.tgz",
-      "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw=",
-      "dev": true
-    },
     "chai": {
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/chai/-/chai-4.2.0.tgz",
@@ -1874,15 +1665,6 @@
       "integrity": "sha512-mT8iDcrh03qDGRRmoA2hmBJnxpllMR+0/0qlzjqZES6NdiWDcZkCNAk4rPFZ9Q85r27unkiNNg8ZOiwZXBHwcA==",
       "dev": true
     },
-    "charm": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/charm/-/charm-1.0.2.tgz",
-      "integrity": "sha1-it02cVOm2aWBMxBSxAkJkdqZXjU=",
-      "dev": true,
-      "requires": {
-        "inherits": "^2.0.1"
-      }
-    },
     "check-error": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/check-error/-/check-error-1.0.2.tgz",
@@ -2017,18 +1799,6 @@
         "delayed-stream": "~1.0.0"
       }
     },
-    "command-exists": {
-      "version": "1.2.9",
-      "resolved": "https://registry.npmjs.org/command-exists/-/command-exists-1.2.9.tgz",
-      "integrity": "sha512-LTQ/SGc+s0Xc0Fu5WaKnR0YiygZkm9eKFvyS+fRsU7/ZWFF8ykFM6Pc9aCVf1+xasOOZpO3BAVgVrKvsqKHV7w==",
-      "dev": true
-    },
-    "commander": {
-      "version": "2.20.3",
-      "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.3.tgz",
-      "integrity": "sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ==",
-      "dev": true
-    },
     "commondir": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/commondir/-/commondir-1.0.1.tgz",
@@ -2088,13 +1858,6 @@
         }
       }
     },
-    "console-control-strings": {
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@@ -5649,21 +5027,6 @@
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-      "resolved": "https://registry.npmjs.org/retry/-/retry-0.10.1.tgz",
-      "integrity": "sha1-52OI0heZLCUnUCQdPTlW/tmNj/Q=",
-      "dev": true
-    },
-    "rimraf": {
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-      "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-2.7.1.tgz",
-      "integrity": "sha512-uWjbaKIK3T1OSVptzX7Nl6PvQ3qAGtKEtVRjRuazjfL3Bx5eI409VZSqgND+4UNnmzLVdPj9FqFJNPqBZFve4w==",
-      "dev": true,
-      "requires": {
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-      }
-    },
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       "resolved": "https://registry.npmjs.org/run-async/-/run-async-2.4.1.tgz",
@@ -5866,12 +5229,6 @@
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-      "resolved": "https://registry.npmjs.org/slide/-/slide-1.1.6.tgz",
-      "integrity": "sha1-VusCfWW00tzmyy4tMsTUr8nh1wc=",
-      "dev": true
-    },
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@@ -6037,32 +5394,6 @@
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-      "integrity": "sha512-HXXqVUq7+pcKeLqqZj6mHFUMvXtOJt1uoUx09pFW6011inTMxqI8BA8PM95myrIyyKwdnzjdFjLiE6KBPVtJIg==",
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-      "requires": {
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-        "assert-plus": "^1.0.0",
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-        "dashdash": "^1.12.0",
-        "ecc-jsbn": "~0.1.1",
-        "getpass": "^0.1.1",
-        "jsbn": "~0.1.0",
-        "safer-buffer": "^2.0.2",
-        "tweetnacl": "~0.14.0"
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-    "ssri": {
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-      "resolved": "https://registry.npmjs.org/ssri/-/ssri-5.3.0.tgz",
-      "integrity": "sha512-XRSIPqLij52MtgoQavH/x/dU1qVKtWUAAZeOHsR9c2Ddi4XerFy3mc1alf+dLJKl9EUIm/Ht+EowFkTUOA6GAQ==",
-      "dev": true,
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@@ -6269,32 +5600,6 @@
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-      "integrity": "sha512-FCEhQ/4rE1zYv9rYXJw/msRqsnmlje5jHP6huWeBZ704jUTy02c5AZyWujpMR1ax6mVw9NyJMfuK2CMDWVIfgA==",
-      "dev": true,
-      "requires": {
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-        "fstream": "^1.0.12",
-        "inherits": "2"
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-      "resolved": "https://registry.npmjs.org/tar-stream/-/tar-stream-1.6.2.tgz",
-      "integrity": "sha512-rzS0heiNf8Xn7/mpdSVVSMAWAoy9bfb1WOTYC78Z0UQKeKa/CWS8FOq0lKGNa8DWKAn9gxjCvMLYc5PGXYlK2A==",
-      "dev": true,
-      "requires": {
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-        "buffer-alloc": "^1.2.0",
-        "end-of-stream": "^1.0.0",
-        "fs-constants": "^1.0.0",
-        "readable-stream": "^2.3.0",
-        "to-buffer": "^1.1.1",
-        "xtend": "^4.0.0"
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     "test-exclude": {
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       "resolved": "https://registry.npmjs.org/test-exclude/-/test-exclude-6.0.0.tgz",
@@ -6318,32 +5623,6 @@
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-      "integrity": "sha512-76SUhtfqR2Ijn+xllcI5P1oyannHNHByD80W1q447gU3mp9G9PSpGdWmjUOHRDPiHYacIk66W7ubDTuPF3BEtQ==",
-      "dev": true,
-      "requires": {
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-      },
-      "dependencies": {
-        "rimraf": {
-          "version": "3.0.2",
-          "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-3.0.2.tgz",
-          "integrity": "sha512-JZkJMZkAGFFPP2YqXZXPbMlMBgsxzE8ILs4lMIX/2o0L9UBw9O/Y3o6wFw/i9YLapcUJWwqbi3kdxIPdC62TIA==",
-          "dev": true,
-          "requires": {
-            "glob": "^7.1.3"
-          }
-        }
-      }
-    },
-    "to-buffer": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/to-buffer/-/to-buffer-1.1.1.tgz",
-      "integrity": "sha512-lx9B5iv7msuFYE3dytT+KE5tap+rNYw+K4jVkb9R/asAb+pbBSM17jtunHplhBe6RRJdZx3Pn2Jph24O32mOVg==",
-      "dev": true
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     "to-fast-properties": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-2.0.0.tgz",
@@ -6370,54 +5649,12 @@
       "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.0.tgz",
       "integrity": "sha512-yaOH/Pk/VEhBWWTlhI+qXxDFXlejDGcQipMlyxda9nthulaxLZUNcUqFxokp0vcYnvteJln5FNQDRrxj3YcbVw=="
     },
-    "tough-cookie": {
-      "version": "2.5.0",
-      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.5.0.tgz",
-      "integrity": "sha512-nlLsUzgm1kfLXSXfRZMc1KLAugd4hqJHDTvc2hDIwS3mZAfMEuMbc03SujMF+GEcpaX/qboeycw6iO8JwVv2+g==",
-      "dev": true,
-      "requires": {
-        "psl": "^1.1.28",
-        "punycode": "^2.1.1"
-      }
-    },
     "tslib": {
       "version": "1.13.0",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.13.0.tgz",
       "integrity": "sha512-i/6DQjL8Xf3be4K/E6Wgpekn5Qasl1usyw++dAA35Ue5orEn65VIxOA+YvNNl9HV3qv70T7CNwjODHZrLwvd1Q==",
       "dev": true
     },
-    "tslint": {
-      "version": "5.14.0",
-      "resolved": "https://registry.npmjs.org/tslint/-/tslint-5.14.0.tgz",
-      "integrity": "sha512-IUla/ieHVnB8Le7LdQFRGlVJid2T/gaJe5VkjzRVSRR6pA2ODYrnfR1hmxi+5+au9l50jBwpbBL34txgv4NnTQ==",
-      "dev": true,
-      "requires": {
-        "babel-code-frame": "^6.22.0",
-        "builtin-modules": "^1.1.1",
-        "chalk": "^2.3.0",
-        "commander": "^2.12.1",
-        "diff": "^3.2.0",
-        "glob": "^7.1.1",
-        "js-yaml": "^3.7.0",
-        "minimatch": "^3.0.4",
-        "mkdirp": "^0.5.1",
-        "resolve": "^1.3.2",
-        "semver": "^5.3.0",
-        "tslib": "^1.8.0",
-        "tsutils": "^2.29.0"
-      },
-      "dependencies": {
-        "tsutils": {
-          "version": "2.29.0",
-          "resolved": "https://registry.npmjs.org/tsutils/-/tsutils-2.29.0.tgz",
-          "integrity": "sha512-g5JVHCIJwzfISaXpXE1qvNalca5Jwob6FjI4AoPlqMusJ6ftFE7IkkFoMhVLRgK+4Kx3gkzb8UZK5t5yTTvEmA==",
-          "dev": true,
-          "requires": {
-            "tslib": "^1.8.1"
-          }
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-      }
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       "version": "3.17.1",
       "resolved": "https://registry.npmjs.org/tsutils/-/tsutils-3.17.1.tgz",
@@ -6427,21 +5664,6 @@
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       }
     },
-    "tunnel-agent": {
-      "version": "0.6.0",
-      "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
-      "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
-      "dev": true,
-      "requires": {
-        "safe-buffer": "^5.0.1"
-      }
-    },
-    "tweetnacl": {
-      "version": "0.14.5",
-      "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz",
-      "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
-      "dev": true
-    },
     "type-check": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",
@@ -6534,12 +5756,6 @@
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       "dev": true
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-    "universalify": {
-      "version": "0.1.2",
-      "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz",
-      "integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg==",
-      "dev": true
-    },
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       "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
@@ -6588,15 +5804,6 @@
         "spdx-expression-parse": "^3.0.0"
       }
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-    "validate-npm-package-name": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/validate-npm-package-name/-/validate-npm-package-name-3.0.0.tgz",
-      "integrity": "sha1-X6kS2B630MdK/BQN5zF/DKffQ34=",
-      "dev": true,
-      "requires": {
-        "builtins": "^1.0.3"
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diff --git a/package.json b/package.json
index b877a242..476cc5ec 100644
--- a/package.json
+++ b/package.json
@@ -28,15 +28,15 @@
     "node": ">= 10.x"
   },
   "scripts": {
-    "test": "npm run prettier:check && npm run lint && npm run check && npm run testonly && npm run check:ts",
-    "test:ci": "npm ci && npm run prettier:check && npm run lint && npm run check && npm run check:ts && npm run testonly:cover && npm run build",
+    "test": "npm run prettier:check && npm run lint && npm run check && npm run testonly && npm run build && npm run check:integrations",
+    "test:ci": "npm ci && npm run prettier:check && npm run lint && npm run check && npm run testonly:cover && npm run build && npm run check:integrations",
     "testonly": "mocha src/**/__tests__/**/*.js",
     "testonly:cover": "nyc npm run testonly",
-    "lint": "eslint src types resources",
+    "lint": "eslint src types resources integrationTests",
     "prettier": "prettier --ignore-path .gitignore --write --list-different '**/*.{js,ts,md,json,yml}'",
     "prettier:check": "prettier --ignore-path .gitignore --check '**/*.{js,ts,md,json,yml}'",
     "check": "flow check",
-    "check:ts": "dtslint types",
+    "check:integrations": "mocha --full-trace integrationTests/*-test.js",
     "build": "node resources/build.js",
     "changelog": "node resources/gen-changelog.js",
     "preversion": ". ./resources/checkgit.sh",
@@ -60,7 +60,6 @@
     "body-parser": "1.19.0",
     "chai": "4.2.0",
     "connect": "3.7.0",
-    "dtslint": "3.6.10",
     "eslint": "7.2.0",
     "eslint-plugin-flowtype": "5.1.3",
     "eslint-plugin-import": "2.20.2",
diff --git a/types/tsconfig.json b/tsconfig.json
similarity index 72%
rename from types/tsconfig.json
rename to tsconfig.json
index 2fe60219..95958ead 100644
--- a/types/tsconfig.json
+++ b/tsconfig.json
@@ -6,8 +6,6 @@
     "noImplicitThis": true,
     "strictNullChecks": true,
     "strictFunctionTypes": true,
-    "noEmit": true,
-    "baseUrl": ".",
-    "paths": { "express-graphql": ["."] }
+    "noEmit": true
   }
 }