diff --git a/package-lock.json b/package-lock.json
index 070d41175..4c13256a1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -697,6 +697,12 @@
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+      "resolved": "https://registry.npmjs.org/@types/minimist/-/minimist-1.2.1.tgz",
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@@ -1081,6 +1102,55 @@
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@@ -1204,6 +1274,12 @@
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@@ -1396,6 +1472,34 @@
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+        "chalk": "^3.0.0",
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@@ -1453,6 +1557,38 @@
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+      "resolved": "https://registry.npmjs.org/cacheable-request/-/cacheable-request-6.1.0.tgz",
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+        "get-stream": "^5.1.0",
+        "http-cache-semantics": "^4.0.0",
+        "keyv": "^3.0.0",
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+        "normalize-url": "^4.1.0",
+        "responselike": "^1.0.2"
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+          "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-5.2.0.tgz",
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+          "dev": true,
+          "requires": {
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+          "resolved": "https://registry.npmjs.org/lowercase-keys/-/lowercase-keys-2.0.0.tgz",
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+      "resolved": "https://registry.npmjs.org/camelcase-keys/-/camelcase-keys-6.2.2.tgz",
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@@ -1541,6 +1688,12 @@
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@@ -1552,6 +1705,15 @@
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+      "integrity": "sha1-0dyXOSAxTfZ/vrlCI7TuNQI56Ws=",
+      "dev": true,
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@@ -1610,6 +1772,20 @@
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+      "resolved": "https://registry.npmjs.org/configstore/-/configstore-5.0.1.tgz",
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@@ -1648,6 +1824,12 @@
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@@ -1833,6 +2054,21 @@
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@@ -1913,6 +2149,12 @@
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@@ -2354,6 +2611,12 @@
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@@ -2931,6 +3194,15 @@
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@@ -2983,6 +3274,12 @@
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+      "resolved": "https://registry.npmjs.org/quick-lru/-/quick-lru-4.0.1.tgz",
+      "integrity": "sha512-ARhCpm70fzdcvNQfPoy49IaanKkTlRWF2JMzqhcJbhSFRZv7nPTvZJdcY7301IPmvW+/p0RgIWnQDLJxifsQ7g==",
+      "dev": true
+    },
+    "rc": {
+      "version": "1.2.8",
+      "resolved": "https://registry.npmjs.org/rc/-/rc-1.2.8.tgz",
+      "integrity": "sha512-y3bGgqKj3QBdxLbLkomlohkvsA8gdAiUQlSBJnBhfn+BPxg4bc62d8TcBW15wavDfgexCgccckhcZvywyQYPOw==",
+      "dev": true,
+      "requires": {
+        "deep-extend": "^0.6.0",
+        "ini": "~1.3.0",
+        "minimist": "^1.2.0",
+        "strip-json-comments": "~2.0.1"
+      },
+      "dependencies": {
+        "strip-json-comments": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
+          "integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo=",
+          "dev": true
+        }
+      }
+    },
     "react-is": {
       "version": "17.0.1",
       "resolved": "https://registry.npmjs.org/react-is/-/react-is-17.0.1.tgz",
@@ -4941,6 +5491,16 @@
         "type-fest": "^0.8.1"
       }
     },
+    "redent": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/redent/-/redent-3.0.0.tgz",
+      "integrity": "sha512-6tDA8g98We0zd0GvVeMT9arEOnTw9qM03L9cJXaCjrip1OO764RDBLBfrB4cwzNGDj5OA5ioymC9GkizgWJDUg==",
+      "dev": true,
+      "requires": {
+        "indent-string": "^4.0.0",
+        "strip-indent": "^3.0.0"
+      }
+    },
     "regex-not": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/regex-not/-/regex-not-1.0.2.tgz",
@@ -4988,6 +5548,24 @@
       "integrity": "sha512-ZOIzd8yVsQQA7j8GCSlPGXwg5PfmA1mrq0JP4nGhh54LaKN3xdai/vHUDu74pKwV8OxseMS65u2NImosQcSD0Q==",
       "dev": true
     },
+    "registry-auth-token": {
+      "version": "4.2.1",
+      "resolved": "https://registry.npmjs.org/registry-auth-token/-/registry-auth-token-4.2.1.tgz",
+      "integrity": "sha512-6gkSb4U6aWJB4SF2ZvLb76yCBjcvufXBqvvEx1HbmKPkutswjW1xNVRY0+daljIYRbogN7O0etYSlbiaEQyMyw==",
+      "dev": true,
+      "requires": {
+        "rc": "^1.2.8"
+      }
+    },
+    "registry-url": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/registry-url/-/registry-url-5.1.0.tgz",
+      "integrity": "sha512-8acYXXTI0AkQv6RAOjE3vOaIXZkT9wo4LOFbBKYQEEnnMNBpKqdUrI6S4NT0KPIo/WVvJ5tE/X5LF/TQUf0ekw==",
+      "dev": true,
+      "requires": {
+        "rc": "^1.2.8"
+      }
+    },
     "remove-trailing-separator": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/remove-trailing-separator/-/remove-trailing-separator-1.1.0.tgz",
@@ -5141,6 +5719,15 @@
       "integrity": "sha1-LGN/53yJOv0qZj/iGqkIAGjiBSo=",
       "dev": true
     },
+    "responselike": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/responselike/-/responselike-1.0.2.tgz",
+      "integrity": "sha1-kYcg7ztjHFZCvgaPFa3lpG9Loec=",
+      "dev": true,
+      "requires": {
+        "lowercase-keys": "^1.0.0"
+      }
+    },
     "ret": {
       "version": "0.1.15",
       "resolved": "https://registry.npmjs.org/ret/-/ret-0.1.15.tgz",
@@ -5354,6 +5941,23 @@
         "lru-cache": "^6.0.0"
       }
     },
+    "semver-diff": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/semver-diff/-/semver-diff-3.1.1.tgz",
+      "integrity": "sha512-GX0Ix/CJcHyB8c4ykpHGIAvLyOwOobtM/8d+TQkAd81/bEjgPHrfba41Vpesr7jX/t8Uh+R3EX9eAS5be+jQYg==",
+      "dev": true,
+      "requires": {
+        "semver": "^6.3.0"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "6.3.0",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
+          "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
+          "dev": true
+        }
+      }
+    },
     "set-blocking": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
@@ -6007,6 +6611,15 @@
       "integrity": "sha512-BrpvfNAE3dcvq7ll3xVumzjKjZQ5tI1sEUIKr3Uoks0XUl45St3FlatVqef9prk4jRDzhW6WZg+3bk93y6pLjA==",
       "dev": true
     },
+    "strip-indent": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/strip-indent/-/strip-indent-3.0.0.tgz",
+      "integrity": "sha512-laJTa3Jb+VQpaC6DseHhF7dXVqHTfJPCRDaEbid/drOhgitgYku/letMUqOXFoWV0zIIUbjpdH2t+tYj4bQMRQ==",
+      "dev": true,
+      "requires": {
+        "min-indent": "^1.0.0"
+      }
+    },
     "strip-json-comments": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-3.1.1.tgz",
@@ -6070,6 +6683,12 @@
         }
       }
     },
+    "term-size": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/term-size/-/term-size-2.2.1.tgz",
+      "integrity": "sha512-wK0Ri4fOGjv/XPy8SBHZChl8CM7uMc5VML7SqiQ0zG7+J5Vr+RMQDoHa2CNT6KHUnTGIXH34UDMkPzAUyapBZg==",
+      "dev": true
+    },
     "terminal-link": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/terminal-link/-/terminal-link-2.1.1.tgz",
@@ -6135,6 +6754,12 @@
         }
       }
     },
+    "to-readable-stream": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/to-readable-stream/-/to-readable-stream-1.0.0.tgz",
+      "integrity": "sha512-Iq25XBt6zD5npPhlLVXGFN3/gyR2/qODcKNNyTMd4vbm39HUaOiAM4PMq0eMVC/Tkxz+Zjdsc55g9yyz+Yq00Q==",
+      "dev": true
+    },
     "to-regex": {
       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/to-regex/-/to-regex-3.0.2.tgz",
@@ -6176,6 +6801,12 @@
         "punycode": "^2.1.1"
       }
     },
+    "trim-newlines": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/trim-newlines/-/trim-newlines-3.0.0.tgz",
+      "integrity": "sha512-C4+gOpvmxaSMKuEf9Qc134F1ZuOHVXKRbtEflf4NTtuuJDEIJ9p5PXsalL8SkeRw+qit1Mo+yuvMPAKwWg/1hA==",
+      "dev": true
+    },
     "tsconfig-paths": {
       "version": "3.9.0",
       "resolved": "https://registry.npmjs.org/tsconfig-paths/-/tsconfig-paths-3.9.0.tgz",
@@ -6205,6 +6836,20 @@
         }
       }
     },
+    "tsd": {
+      "version": "0.14.0",
+      "resolved": "https://registry.npmjs.org/tsd/-/tsd-0.14.0.tgz",
+      "integrity": "sha512-fl1gS5orAwqIb0P2xMdppgCrwv1BfCJn67wBzRBCV9OUaWHVXHqiIqL6yX/519xFgT1ZOaLMhr5W9XDo8kuuRA==",
+      "dev": true,
+      "requires": {
+        "eslint-formatter-pretty": "^4.0.0",
+        "globby": "^11.0.1",
+        "meow": "^7.0.1",
+        "path-exists": "^4.0.0",
+        "read-pkg-up": "^7.0.0",
+        "update-notifier": "^4.1.0"
+      }
+    },
     "tslib": {
       "version": "1.14.1",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
@@ -6283,6 +6928,15 @@
         "set-value": "^2.0.1"
       }
     },
+    "unique-string": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/unique-string/-/unique-string-2.0.0.tgz",
+      "integrity": "sha512-uNaeirEPvpZWSgzwsPGtU2zVSTrn/8L5q/IexZmH0eH6SA73CmAA5U4GwORTxQAZs95TAXLNqeLoPPNO5gZfWg==",
+      "dev": true,
+      "requires": {
+        "crypto-random-string": "^2.0.0"
+      }
+    },
     "unset-value": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/unset-value/-/unset-value-1.0.0.tgz",
@@ -6323,6 +6977,39 @@
         }
       }
     },
+    "update-notifier": {
+      "version": "4.1.3",
+      "resolved": "https://registry.npmjs.org/update-notifier/-/update-notifier-4.1.3.tgz",
+      "integrity": "sha512-Yld6Z0RyCYGB6ckIjffGOSOmHXj1gMeE7aROz4MG+XMkmixBX4jUngrGXNYz7wPKBmtoD4MnBa2Anu7RSKht/A==",
+      "dev": true,
+      "requires": {
+        "boxen": "^4.2.0",
+        "chalk": "^3.0.0",
+        "configstore": "^5.0.1",
+        "has-yarn": "^2.1.0",
+        "import-lazy": "^2.1.0",
+        "is-ci": "^2.0.0",
+        "is-installed-globally": "^0.3.1",
+        "is-npm": "^4.0.0",
+        "is-yarn-global": "^0.3.0",
+        "latest-version": "^5.0.0",
+        "pupa": "^2.0.1",
+        "semver-diff": "^3.1.1",
+        "xdg-basedir": "^4.0.0"
+      },
+      "dependencies": {
+        "chalk": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-3.0.0.tgz",
+          "integrity": "sha512-4D3B6Wf41KOYRFdszmDqMCGq5VV/uMAB273JILmO+3jAlh8X4qDtdtgCR3fxtbLEMzSx22QdhnDcJvu2u1fVwg==",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^4.1.0",
+            "supports-color": "^7.1.0"
+          }
+        }
+      }
+    },
     "uri-js": {
       "version": "4.4.0",
       "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.0.tgz",
@@ -6338,6 +7025,15 @@
       "integrity": "sha1-2pN/emLiH+wf0Y1Js1wpNQZ6bHI=",
       "dev": true
     },
+    "url-parse-lax": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/url-parse-lax/-/url-parse-lax-3.0.0.tgz",
+      "integrity": "sha1-FrXK/Afb42dsGxmZF3gj1lA6yww=",
+      "dev": true,
+      "requires": {
+        "prepend-http": "^2.0.0"
+      }
+    },
     "use": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/use/-/use-3.1.1.tgz",
@@ -6471,6 +7167,15 @@
       "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
       "dev": true
     },
+    "widest-line": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/widest-line/-/widest-line-3.1.0.tgz",
+      "integrity": "sha512-NsmoXalsWVDMGupxZ5R08ka9flZjjiLvHVAWYOKtiKM8ujtZWr9cRffak+uSE48+Ob8ObalXpwyeUiyDD6QFgg==",
+      "dev": true,
+      "requires": {
+        "string-width": "^4.0.0"
+      }
+    },
     "word-wrap": {
       "version": "1.2.3",
       "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
diff --git a/package.json b/package.json
index c94e32b16..b4307dc84 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
     "typescript-lint": "eslint typings/*.ts",
     "test": "jest && npm run test-typings",
     "test-esm": "node --experimental-modules ./tests/esm-test.mjs",
-    "test-typings": "tsc -p tsconfig.json",
+    "test-typings": "tsd",
     "typescript-checkJS": "tsc --allowJS --checkJS index.js --noEmit",
     "test-all": "npm run test && npm run lint && npm run typescript-lint && npm run typescript-checkJS && npm run test-esm"
   },
@@ -45,9 +45,10 @@
     "eslint-plugin-jest": "^24.1.3",
     "jest": "^26.6.3",
     "standard": "^16.0.3",
+    "tsd": "^0.14.0",
     "typescript": "^4.1.2"
   },
-  "typings": "typings/index.d.ts",
+  "types": "typings/index.d.ts",
   "jest": {
     "collectCoverage": true
   },
diff --git a/tsconfig.json b/tsconfig.json
index 24b014583..8be030472 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -13,8 +13,5 @@
         "noEmit": true,
         "forceConsistentCasingInFileNames": true
     },
-    "files": [
-        "typings/index.d.ts",
-        "typings/commander-tests.ts"
-    ]
+    "include": ["**/*.ts"],
 }
diff --git a/typings/commander-tests.ts b/typings/commander-tests.ts
deleted file mode 100644
index 7e0e71b8a..000000000
--- a/typings/commander-tests.ts
+++ /dev/null
@@ -1,342 +0,0 @@
-import * as commander from './index';
-
-// Test Commander usage with TypeScript.
-// This is NOT a usable program, just used to test for compile errors!
-
-// We declare lots of variables just to check types of right-side of expression, so disable this:
-/* eslint-disable @typescript-eslint/no-unused-vars */
-
-// This conflicts with esline rule saying no space!
-/* eslint-disable @typescript-eslint/space-before-function-paren */
-
-const program: commander.Command = new commander.Command();
-// program.silly; // <-- Error, hurrah!
-
-// Check for exported global Command objects
-const importedDefaultProgram: commander.Command = commander;
-const importedExplicitProgram: commander.Command = commander.program;
-
-// Check export classes exist
-const commandInstance1 = new commander.Command();
-const commandInstance2 = new commander.Command('name');
-const optionsInstance = new commander.Option('-f');
-const errorInstance = new commander.CommanderError(1, 'code', 'message');
-const invalidOptionErrorInstance = new commander.InvalidOptionArgumentError('message');
-
-// Command properties
-const theArgs: string[] = program.args;
-const theCommands: commander.Command[] = program.commands;
-
-// version
-const versionThis1: commander.Command = program.version('1.2.3');
-const versionThis2: commander.Command = program.version('1.2.3', '-r,--revision');
-const versionThis3: commander.Command = program.version('1.2.3', '-r,--revision', 'show revision information');
-
-// command (and CommandOptions)
-const commandNew1: commander.Command = program.command('action');
-const commandNew2: commander.Command = program.command('action', { isDefault: true, hidden: true, noHelp: true });
-const commandThis1: commander.Command = program.command('exec', 'exec description');
-const commandThis2: commander.Command = program.command('exec', 'exec description', { isDefault: true, hidden: true, noHelp: true, executableFile: 'foo' });
-
-// addCommand
-const addCommandThis: commander.Command = program.addCommand(new commander.Command('abc'));
-
-// arguments
-const argumentsThis: commander.Command = program.arguments('<cmd> [env]');
-
-// addHelpCommand
-const addHelpCommandThis1: commander.Command = program.addHelpCommand();
-const addHelpCommandThis3: commander.Command = program.addHelpCommand(false);
-const addHelpCommandThis2: commander.Command = program.addHelpCommand(true);
-const addHelpCommandThis4: commander.Command = program.addHelpCommand('compress <file>');
-const addHelpCommandThis5: commander.Command = program.addHelpCommand('compress <file>', 'compress target file');
-
-// exitOverride
-const exitThis1: commander.Command = program.exitOverride();
-const exitThis2: commander.Command = program.exitOverride((err): never => {
-  return process.exit(err.exitCode);
-});
-const exitThis3: commander.Command = program.exitOverride((err): void => {
-  if (err.code !== 'commander.executeSubCommandAsync') {
-    throw err;
-  } else {
-    // Async callback from spawn events, not useful to throw.
-  }
-});
-
-// action
-const actionThis1: commander.Command = program.action(() => {
-  // do nothing.
-});
-const actionThis2: commander.Command = program.action(async() => {
-  // do nothing.
-});
-
-// option
-const optionThis1: commander.Command = program.option('-a,--alpha');
-const optionThis2: commander.Command = program.option('-p, --peppers', 'Add peppers');
-const optionThis3: commander.Command = program.option('-s, --string [value]', 'default string', 'value');
-const optionThis4: commander.Command = program.option('-b, --boolean', 'default boolean', false);
-program.option('--drink <size', 'drink size', /small|medium|large/);
-
-// example coercion functions from README
-
-function myParseInt(value: string, dummyPrevious: number): number {
-  return parseInt(value);
-}
-
-function increaseVerbosity(dummyValue: string, previous: number): number {
-  return previous + 1;
-}
-
-function collect(value: string, previous: string[]): string[] {
-  return previous.concat([value]);
-}
-
-function commaSeparatedList(value: string, dummyPrevious: string[]): string[] {
-  return value.split(',');
-}
-
-const optionThis5: commander.Command = program.option('-f, --float <number>', 'float argument', parseFloat);
-const optionThis6: commander.Command = program.option('-f, --float <number>', 'float argument', parseFloat, 3.2);
-const optionThis7: commander.Command = program.option('-i, --integer <number>', 'integer argument', myParseInt);
-const optionThis8: commander.Command = program.option('-i, --integer <number>', 'integer argument', myParseInt, 5);
-const optionThis9: commander.Command = program.option('-v, --verbose', 'verbosity that can be increased', increaseVerbosity, 0);
-const optionThis10: commander.Command = program.option('-c, --collect <value>', 'repeatable value', collect, []);
-const optionThis11: commander.Command = program.option('-l, --list <items>', 'comma separated list', commaSeparatedList);
-
-// requiredOption, same tests as option
-const requiredOptionThis1: commander.Command = program.requiredOption('-a,--alpha');
-const requiredOptionThis2: commander.Command = program.requiredOption('-p, --peppers', 'Add peppers');
-const requiredOptionThis3: commander.Command = program.requiredOption('-s, --string [value]', 'default string', 'value');
-const requiredOptionThis4: commander.Command = program.requiredOption('-b, --boolean', 'default boolean', false);
-program.requiredOption('--drink <size', 'drink size', /small|medium|large/);
-
-const requiredOptionThis5: commander.Command = program.requiredOption('-f, --float <number>', 'float argument', parseFloat);
-const requiredOptionThis6: commander.Command = program.requiredOption('-f, --float <number>', 'float argument', parseFloat, 3.2);
-const requiredOptionThis7: commander.Command = program.requiredOption('-i, --integer <number>', 'integer argument', myParseInt);
-const requiredOptionThis8: commander.Command = program.requiredOption('-i, --integer <number>', 'integer argument', myParseInt, 5);
-const requiredOptionThis9: commander.Command = program.requiredOption('-v, --verbose', 'verbosity that can be increased', increaseVerbosity, 0);
-const requiredOptionThis10: commander.Command = program.requiredOption('-c, --collect <value>', 'repeatable value', collect, []);
-const requiredOptionThis11: commander.Command = program.requiredOption('-l, --list <items>', 'comma separated list', commaSeparatedList);
-
-// createOption
-const createOption1: commander.Option = program.createOption('a, --alpha');
-const createOption2: commander.Option = program.createOption('a, --alpha', 'description');
-
-// addOption
-const addOptionThis: commander.Command = program.addOption(new commander.Option('-s,--simple'));
-
-// storeOptionsAsProperties
-// chaining
-const storeOptionsAsPropertiesThis1: commander.Command = program.storeOptionsAsProperties();
-const storeOptionsAsPropertiesThis2: commander.Command = program.storeOptionsAsProperties(false);
-// return type depends on parameter
-const storeOptionsAsPropertiesThis3 = program.storeOptionsAsProperties();
-const storeOptionsAsPropertiesValue3 = storeOptionsAsPropertiesThis3.someOption;
-const storeOptionsAsPropertiesThis4 = program.storeOptionsAsProperties(true);
-const storeOptionsAsPropertiesValue4 = storeOptionsAsPropertiesThis4.someOption;
-const storeOptionsAsPropertiesThis5 = program.storeOptionsAsProperties(false);
-// const storeOptionsAsPropertiesValue5 = storeOptionsAsPropertiesThis5.someOption; // error
-
-// combineFlagAndOptionalValue
-const combineFlagAndOptionalValueThis1: commander.Command = program.combineFlagAndOptionalValue();
-const combineFlagAndOptionalValueThis2: commander.Command = program.combineFlagAndOptionalValue(false);
-
-// allowUnknownOption
-const allowUnknownOptionThis1: commander.Command = program.allowUnknownOption();
-const allowUnknownOptionThis2: commander.Command = program.allowUnknownOption(false);
-
-// allowExcessArguments
-const allowExcessArgumentsThis1: commander.Command = program.allowExcessArguments();
-const allowExcessArgumentsThis2: commander.Command = program.allowExcessArguments(false);
-
-// enablePositionalOptions
-const enablePositionalOptionsThis1: commander.Command = program.enablePositionalOptions();
-const enablePositionalOptionsThis2: commander.Command = program.enablePositionalOptions(false);
-
-// passThroughOptions
-const passThroughOptionsThis1: commander.Command = program.passThroughOptions();
-const passThroughOptionsThis2: commander.Command = program.passThroughOptions(false);
-
-// parse
-const parseThis1: commander.Command = program.parse();
-const parseThis2: commander.Command = program.parse(process.argv);
-const parseThis3: commander.Command = program.parse(['node', 'script.js'], { from: 'node' });
-const parseThis4: commander.Command = program.parse(['node', 'script.js'], { from: 'electron' });
-const parseThis5: commander.Command = program.parse(['--option'], { from: 'user' });
-
-// parseAsync, same tests as parse
-const parseAsyncThis1: Promise<commander.Command> = program.parseAsync();
-const parseAsyncThis2: Promise<commander.Command> = program.parseAsync(process.argv);
-const parseAsyncThis3: Promise<commander.Command> = program.parseAsync(['node', 'script.js'], { from: 'node' });
-const parseAsyncThis4: Promise<commander.Command> = program.parseAsync(['node', 'script.js'], { from: 'electron' });
-const parseAsyncThis5: Promise<commander.Command> = program.parseAsync(['--option'], { from: 'user' });
-
-// parseOptions (and ParseOptionsResult)
-const { operands, unknown } = program.parseOptions(['node', 'script.js', 'hello']);
-
-// opts
-const opts = program.opts();
-const optsVal1 = opts.foo;
-// eslint-disable-next-line @typescript-eslint/dot-notation
-const opstVale2 = opts['bar'];
-
-// description
-const descriptionThis: commander.Command = program.description('my description');
-const descriptionValue: string = program.description();
-
-// alias
-const aliasThis: commander.Command = program.alias('my alias');
-const aliasValue: string = program.alias();
-
-// aliases
-const aliasesThis: commander.Command = program.aliases(['first-alias', 'second-alias']);
-const aliasesValue: string[] = program.aliases();
-
-// usage
-const usageThis: commander.Command = program.usage('my usage');
-const usageValue: string = program.usage();
-
-// name
-const nameThis: commander.Command = program.name('my-name');
-const nameValue: string = program.name();
-
-// outputHelp
-program.outputHelp();
-program.outputHelp((str: string) => { return str; });
-program.outputHelp({ error: true });
-
-// help
-program.help();
-program.help((str: string) => { return str; });
-program.help({ error: true });
-
-// helpInformation
-const helpInformnationValue: string = program.helpInformation();
-const helpInformnationValue2: string = program.helpInformation({ error: true });
-
-// helpOption
-const helpOptionThis1: commander.Command = program.helpOption('-h,--help');
-const helpOptionThis2: commander.Command = program.helpOption('-h,--help', 'custom description');
-const helpOptionThis3: commander.Command = program.helpOption(undefined, 'custom description');
-const helpOptionThis4: commander.Command = program.helpOption(false);
-
-// addHelpText
-const addHelpTextThis1: commander.Command = program.addHelpText('after', 'text');
-const addHelpTextThis2: commander.Command = program.addHelpText('afterAll', 'text');
-const addHelpTextThis3: commander.Command = program.addHelpText('before', () => 'before');
-const addHelpTextThis4: commander.Command = program.addHelpText('beforeAll', (context: commander.AddHelpTextContext) => {
-  if (context.error) {
-    return; // Can return nothing to skip display
-  }
-  return context.command.name();
-});
-
-// on
-const onThis: commander.Command = program.on('command:foo', () => {
-  // do nothing.
-});
-
-// createCommand
-
-const createInstance2: commander.Command = program.createCommand('name');
-
-class MyCommand extends commander.Command {
-  createCommand(name?: string): MyCommand {
-    return new MyCommand(name);
-  }
-
-  myFunction(): void {
-    // do nothing.
-  }
-}
-const myProgram = new MyCommand();
-myProgram.myFunction();
-const mySub = myProgram.command('sub');
-mySub.myFunction();
-
-// configureHelp
-
-const createHelpInstance: commander.Help = program.createHelp();
-const configureHelpThis: commander.Command = program.configureHelp({
-  sortSubcommands: true, // override property
-  visibleCommands: (cmd: commander.Command) => [] // override method
-});
-const helpConfiguration: commander.HelpConfiguration = program.configureHelp();
-
-// configureOutput
-const configureOutputThis: commander.Command = program.configureOutput({ });
-const configureOutputConfig: commander.OutputConfiguration = program.configureOutput();
-
-program.configureOutput({
-  writeOut: (str: string) => console.log(str),
-  writeErr: (str: string) => console.error(str),
-  getOutHelpWidth: () => 80,
-  getErrHelpWidth: () => 80,
-  outputError: (str: string, write: (str: string) => void) => { write(str); }
-});
-
-// Help
-const helper = new commander.Help();
-const helperCommand = new commander.Command();
-const helperOption = new commander.Option('-a, --all');
-
-helper.helpWidth = 3;
-helper.sortSubcommands = true;
-helper.sortOptions = false;
-
-const subcommandTermStr: string = helper.subcommandTerm(helperCommand);
-const commandUsageStr: string = helper.commandUsage(helperCommand);
-const commandDescriptionStr: string = helper.commandDescription(helperCommand);
-const subcommandDescriptionStr: string = helper.subcommandDescription(helperCommand);
-const optionTermStr: string = helper.optionTerm(helperOption);
-const optionDescriptionStr: string = helper.optionDescription(helperOption);
-
-const visibleCommands: commander.Command[] = helper.visibleCommands(helperCommand);
-const visibleOptions: commander.Option[] = helper.visibleOptions(helperCommand);
-const visibleArguments: Array<{ term: string; description: string}> = helper.visibleArguments(helperCommand);
-
-const widestCommand: number = helper.longestSubcommandTermLength(helperCommand, helper);
-const widestOption: number = helper.longestOptionTermLength(helperCommand, helper);
-const widestArgument: number = helper.longestArgumentTermLength(helperCommand, helper);
-const widest: number = helper.padWidth(helperCommand, helper);
-
-const wrapped: string = helper.wrap('a b c', 50, 3);
-
-const formatted: string = helper.formatHelp(helperCommand, helper);
-
-// Option methods
-
-const baseOption = new commander.Option('-f,--foo', 'foo description');
-
-// default
-const myOptionThis1: commander.Option = baseOption.default(3);
-const myOptionThis2: commander.Option = baseOption.default(60, 'one minute');
-
-// fullDescription
-const optionDescription: string = baseOption.fullDescription();
-
-// argParser
-const myOptionThis3: commander.Option = baseOption.argParser((value: string) => parseInt(value));
-const myOptionThis4: commander.Option = baseOption.argParser((value: string, previous: string[]) => { return previous.concat(value); });
-
-// makeOptionMandatory
-const myOptionThis5: commander.Option = baseOption.makeOptionMandatory();
-const myOptionThis6: commander.Option = baseOption.makeOptionMandatory(true);
-
-// hideHelp
-const hideHelpThis1: commander.Option = baseOption.hideHelp();
-const hideHelpThis2: commander.Option = baseOption.hideHelp(true);
-const hideHelpThis3: commander.Option = baseOption.hideHelp(false);
-
-// argumentRejected
-function goodbye(): never {
-  return baseOption.argumentRejected('failed');
-}
-
-// choices
-const choicesThis: commander.Option = baseOption.choices(['a', 'b']);
-
-// name
-const optionName: string = baseOption.name();
diff --git a/typings/index.test-d.ts b/typings/index.test-d.ts
new file mode 100644
index 000000000..6b56e5f0b
--- /dev/null
+++ b/typings/index.test-d.ts
@@ -0,0 +1,325 @@
+import * as commander from './index';
+import {expectType, expectAssignable} from 'tsd';
+
+// We are are not just checking return types here, we are also implicitly checking that the expected syntax is allowed.
+
+const program: commander.Command = new commander.Command();
+// program.silly; // <-- Error, hurrah!
+
+// Check for exported global Command object(s)
+expectAssignable<commander.Command>(commander); // legacy default export of program
+expectType<commander.Command>(commander.program);
+
+// Check export classes and functions exist
+expectType<commander.Command>(new commander.Command());
+expectType<commander.Command>(new commander.Command('name'));
+expectType<commander.Option>(new commander.Option('-f'));
+expectType<commander.CommanderError>(new commander.CommanderError(1, 'code', 'message'));
+expectType<commander.InvalidOptionArgumentError>(new commander.InvalidOptionArgumentError('message'));
+expectType<commander.Command>(commander.createCommand());
+
+// Command properties
+expectType<string[]>(program.args);
+expectType<commander.Command[]>(program.commands);
+
+// version
+expectType<commander.Command>(program.version('1.2.3'));
+expectType<commander.Command>(program.version('1.2.3', '-r,--revision'));
+expectType<commander.Command>(program.version('1.2.3', '-r,--revision', 'show revision information'));
+
+// command (and CommandOptions)
+expectType<commander.Command>(program.command('action'));
+expectType<commander.Command>(program.command('action', { isDefault: true, hidden: true, noHelp: true }));
+expectType<commander.Command>(program.command('exec', 'exec description'));
+expectType<commander.Command>(program.command('exec', 'exec description', { isDefault: true, hidden: true, noHelp: true, executableFile: 'foo' }));
+
+// addCommand
+expectType<commander.Command>(program.addCommand(new commander.Command('abc')));
+
+// arguments
+expectType<commander.Command>(program.arguments('<cmd> [env]'));
+
+// addHelpCommand
+expectType<commander.Command>(program.addHelpCommand());
+expectType<commander.Command>(program.addHelpCommand(false));
+expectType<commander.Command>(program.addHelpCommand(true));
+expectType<commander.Command>(program.addHelpCommand('compress <file>'));
+expectType<commander.Command>(program.addHelpCommand('compress <file>', 'compress target file'));
+
+// exitOverride
+expectType<commander.Command>(program.exitOverride());
+expectType<commander.Command>(program.exitOverride((err): never => {
+  return process.exit(err.exitCode);
+}));
+expectType<commander.Command>(program.exitOverride((err): void => {
+  if (err.code !== 'commander.executeSubCommandAsync') {
+    throw err;
+  } else {
+    // Async callback from spawn events, not useful to throw.
+  }
+}));
+
+// action
+expectType<commander.Command>(program.action(() => {
+  // do nothing.
+}));
+expectType<commander.Command>(program.action(async() => {
+  // do nothing.
+}));
+
+// option
+expectType<commander.Command>(program.option('-a,--alpha'));
+expectType<commander.Command>(program.option('-p, --peppers', 'Add peppers'));
+expectType<commander.Command>(program.option('-s, --string [value]', 'default string', 'value'));
+expectType<commander.Command>(program.option('-b, --boolean', 'default boolean', false));
+expectType<commander.Command>(program.option('--drink <size', 'drink size', /small|medium|large/)); // deprecated
+
+// example coercion functions from README
+
+function myParseInt(value: string): number {
+  return parseInt(value);
+}
+
+function increaseVerbosity(dummyValue: string, previous: number): number {
+  return previous + 1;
+}
+
+function collect(value: string, previous: string[]): string[] {
+  return previous.concat([value]);
+}
+
+function commaSeparatedList(value: string): string[] {
+  return value.split(',');
+}
+
+expectType<commander.Command>(program.option('-f, --float <number>', 'float argument', parseFloat));
+expectType<commander.Command>(program.option('-f, --float <number>', 'float argument', parseFloat, 3.2));
+expectType<commander.Command>(program.option('-i, --integer <number>', 'integer argument', myParseInt));
+expectType<commander.Command>(program.option('-i, --integer <number>', 'integer argument', myParseInt, 5));
+expectType<commander.Command>(program.option('-v, --verbose', 'verbosity that can be increased', increaseVerbosity, 0));
+expectType<commander.Command>(program.option('-c, --collect <value>', 'repeatable value', collect, []));
+expectType<commander.Command>(program.option('-l, --list <items>', 'comma separated list', commaSeparatedList));
+
+// requiredOption, same tests as option
+expectType<commander.Command>(program.requiredOption('-a,--alpha'));
+expectType<commander.Command>(program.requiredOption('-p, --peppers', 'Add peppers'));
+expectType<commander.Command>(program.requiredOption('-s, --string [value]', 'default string', 'value'));
+expectType<commander.Command>(program.requiredOption('-b, --boolean', 'default boolean', false));
+expectType<commander.Command>(program.requiredOption('--drink <size', 'drink size', /small|medium|large/)); // deprecated
+
+expectType<commander.Command>(program.requiredOption('-f, --float <number>', 'float argument', parseFloat));
+expectType<commander.Command>(program.requiredOption('-f, --float <number>', 'float argument', parseFloat, 3.2));
+expectType<commander.Command>(program.requiredOption('-i, --integer <number>', 'integer argument', myParseInt));
+expectType<commander.Command>(program.requiredOption('-i, --integer <number>', 'integer argument', myParseInt, 5));
+expectType<commander.Command>(program.requiredOption('-v, --verbose', 'verbosity that can be increased', increaseVerbosity, 0));
+expectType<commander.Command>(program.requiredOption('-c, --collect <value>', 'repeatable value', collect, []));
+expectType<commander.Command>(program.requiredOption('-l, --list <items>', 'comma separated list', commaSeparatedList));
+
+// createOption
+expectType<commander.Option>(program.createOption('a, --alpha'));
+expectType<commander.Option>(program.createOption('a, --alpha', 'description'));
+
+// addOption
+expectType<commander.Command>(program.addOption(new commander.Option('-s,--simple')));
+
+// storeOptionsAsProperties
+expectType<commander.Command & commander.OptionValues>(program.storeOptionsAsProperties());
+expectType<commander.Command & commander.OptionValues>(program.storeOptionsAsProperties(true));
+expectType<commander.Command>(program.storeOptionsAsProperties(false));
+
+// combineFlagAndOptionalValue
+expectType<commander.Command>(program.combineFlagAndOptionalValue());
+expectType<commander.Command>(program.combineFlagAndOptionalValue(false));
+
+// allowUnknownOption
+expectType<commander.Command>(program.allowUnknownOption());
+expectType<commander.Command>(program.allowUnknownOption(false));
+
+// allowExcessArguments
+expectType<commander.Command>(program.allowExcessArguments());
+expectType<commander.Command>(program.allowExcessArguments(false));
+
+// enablePositionalOptions
+expectType<commander.Command>(program.enablePositionalOptions());
+expectType<commander.Command>(program.enablePositionalOptions(false));
+
+// passThroughOptions
+expectType<commander.Command>(program.passThroughOptions());
+expectType<commander.Command>(program.passThroughOptions(false));
+
+// parse
+expectType<commander.Command>(program.parse());
+expectType<commander.Command>(program.parse(process.argv));
+expectType<commander.Command>(program.parse(['node', 'script.js'], { from: 'node' }));
+expectType<commander.Command>(program.parse(['node', 'script.js'], { from: 'electron' }));
+expectType<commander.Command>(program.parse(['--option'], { from: 'user' }));
+
+// parseAsync, same tests as parse
+expectType<Promise<commander.Command>>(program.parseAsync());
+expectType<Promise<commander.Command>>(program.parseAsync(process.argv));
+expectType<Promise<commander.Command>>(program.parseAsync(['node', 'script.js'], { from: 'node' }));
+expectType<Promise<commander.Command>>(program.parseAsync(['node', 'script.js'], { from: 'electron' }));
+expectType<Promise<commander.Command>>(program.parseAsync(['--option'], { from: 'user' }));
+
+// parseOptions (and ParseOptionsResult)
+expectType<{operands: string[]; unknown: string[]}>(program.parseOptions(['node', 'script.js', 'hello']));
+
+// opts
+const opts = program.opts();
+expectType<commander.OptionValues>(opts);
+expectType(opts.foo);
+expectType(opts['bar']);
+
+// description
+expectType<commander.Command>(program.description('my description'));
+expectType<string>(program.description());
+
+// alias
+expectType<commander.Command>(program.alias('my alias'));
+expectType<string>(program.alias());
+
+// aliases
+expectType<commander.Command>(program.aliases(['first-alias', 'second-alias']));
+expectType<string[]>(program.aliases());
+
+// usage
+expectType<commander.Command>(program.usage('my usage'));
+expectType<string>(program.usage());
+
+// name
+expectType<commander.Command>(program.name('my-name'));
+expectType<string>(program.name());
+
+// outputHelp
+expectType<void>(program.outputHelp());
+expectType<void>(program.outputHelp((str: string) => { return str; }));
+expectType<void>(program.outputHelp({ error: true }));
+
+// help
+expectType<never>(program.help());
+expectType<never>(program.help((str: string) => { return str; }));
+expectType<never>(program.help({ error: true }));
+
+// helpInformation
+expectType<string>(program.helpInformation());
+expectType<string>(program.helpInformation({ error: true }));
+
+// helpOption
+expectType<commander.Command>(program.helpOption('-h,--help'));
+expectType<commander.Command>(program.helpOption('-h,--help', 'custom description'));
+expectType<commander.Command>(program.helpOption(undefined, 'custom description'));
+expectType<commander.Command>(program.helpOption(false));
+
+// addHelpText
+expectType<commander.Command>(program.addHelpText('after', 'text'));
+expectType<commander.Command>(program.addHelpText('afterAll', 'text'));
+expectType<commander.Command>(program.addHelpText('before', () => 'before'));
+expectType<commander.Command>(program.addHelpText('beforeAll', (context: commander.AddHelpTextContext) => {
+  if (context.error) {
+    return; // Can return nothing to skip display
+  }
+  return context.command.name();
+}));
+
+// on
+expectType<commander.Command>(program.on('command:foo', () => {
+  // do nothing.
+}));
+
+// createCommand
+expectType<commander.Command>(program.createCommand());
+expectType<commander.Command>(program.createCommand('name'));
+
+class MyCommand extends commander.Command {
+  createCommand(name?: string): MyCommand {
+    return new MyCommand(name);
+  }
+
+  myFunction(): void {
+    // do nothing.
+  }
+}
+const myProgram = new MyCommand();
+expectType<MyCommand>(myProgram.command('sub'));
+
+// configureHelp
+expectType<commander.Help>(program.createHelp());
+expectType<commander.Command>(program.configureHelp({
+  sortSubcommands: true, // override property
+  visibleCommands: () => [] // override method
+}));
+expectType<commander.HelpConfiguration>(program.configureHelp());
+
+// configureOutput
+expectType<commander.Command>(program.configureOutput({ }));
+expectType<commander.OutputConfiguration>(program.configureOutput());
+
+expectType<commander.Command>(program.configureOutput({
+  writeOut: (str: string) => console.log(str),
+  writeErr: (str: string) => console.error(str),
+  getOutHelpWidth: () => 80,
+  getErrHelpWidth: () => 80,
+  outputError: (str: string, write: (str: string) => void) => { write(str); }
+}));
+
+// Help
+const helper = new commander.Help();
+const helperCommand = new commander.Command();
+const helperOption = new commander.Option('-a, --all');
+
+expectType<number | undefined>(helper.helpWidth);
+expectType<boolean>(helper.sortSubcommands);
+expectType<boolean>(helper.sortOptions);
+
+expectType<string>(helper.subcommandTerm(helperCommand));
+expectType<string>(helper.commandUsage(helperCommand));
+expectType<string>(helper.commandDescription(helperCommand));
+expectType<string>(helper.subcommandDescription(helperCommand));
+expectType<string>(helper.optionTerm(helperOption));
+expectType<string>(helper.optionDescription(helperOption));
+
+expectType<commander.Command[]>(helper.visibleCommands(helperCommand));
+expectType<commander.Option[]>(helper.visibleOptions(helperCommand));
+expectType<Array<{ term: string; description: string}>>(helper.visibleArguments(helperCommand));
+
+expectType<number>(helper.longestSubcommandTermLength(helperCommand, helper));
+expectType<number>(helper.longestOptionTermLength(helperCommand, helper));
+expectType<number>(helper.longestArgumentTermLength(helperCommand, helper));
+expectType<number>(helper.padWidth(helperCommand, helper));
+
+expectType<string>(helper.wrap('a b c', 50, 3));
+
+expectType<string>(helper.formatHelp(helperCommand, helper));
+
+// Option methods
+
+const baseOption = new commander.Option('-f,--foo', 'foo description');
+
+// default
+expectType<commander.Option>(baseOption.default(3));
+expectType<commander.Option>(baseOption.default(60, 'one minute'));
+
+// fullDescription
+expectType<string>(baseOption.fullDescription());
+
+// argParser
+expectType<commander.Option>(baseOption.argParser((value: string) => parseInt(value)));
+expectType<commander.Option>(baseOption.argParser((value: string, previous: string[]) => { return previous.concat(value); }));
+
+// makeOptionMandatory
+expectType<commander.Option>(baseOption.makeOptionMandatory());
+expectType<commander.Option>(baseOption.makeOptionMandatory(true));
+
+// hideHelp
+expectType<commander.Option>(baseOption.hideHelp());
+expectType<commander.Option>(baseOption.hideHelp(true));
+expectType<commander.Option>(baseOption.hideHelp(false));
+
+// argumentRejected
+expectType<never>(baseOption.argumentRejected('failed'));
+
+// choices
+expectType<commander.Option>(baseOption.choices(['a', 'b']));
+
+// name
+expectType<string>(baseOption.name());