diff --git a/index.ts b/index.ts
index 57fa743..2e90dd2 100644
--- a/index.ts
+++ b/index.ts
@@ -9,9 +9,9 @@ Example:
 // TypeScript Version: 2.1
 */
 
-export type TypeScriptVersion = "2.0" | "2.1" | "2.2" | "2.3" | "2.4" | "2.5";
+export type TypeScriptVersion = "2.0" | "2.1" | "2.2" | "2.3" | "2.4" | "2.5" | "2.6";
 export namespace TypeScriptVersion {
-	export const all: ReadonlyArray<TypeScriptVersion> = ["2.0", "2.1", "2.2", "2.3", "2.4", "2.5"];
+	export const all: ReadonlyArray<TypeScriptVersion> = ["2.0", "2.1", "2.2", "2.3", "2.4", "2.5", "2.6"];
 	export const lowest = all[0];
 	/** Latest version that may be specified in a `// TypeScript Version:` header. */
 	export const latest = all[all.length - 1];
@@ -210,7 +210,7 @@ function parseLabel(strict: boolean): pm.Parser<Label> {
 		const [name, major, minor] = [reverse(nameReverse), reverse(majorReverse), reverse(minorReverse)];
 		return pm.makeSuccess<Label>(end, { name, major: intOfString(major), minor: minor === "x" ? 0 : intOfString(minor) });
 
-		function fail(msg?: string): pm.Result<Label> {
+		function fail(msg?: string): pm.Reply<Label> {
 			let expected = "foo MAJOR.MINOR";
 			if (msg !== undefined) {
 				expected += ` (${msg})`;
@@ -221,17 +221,10 @@ function parseLabel(strict: boolean): pm.Parser<Label> {
 }
 
 const typeScriptVersionLineParser: pm.Parser<TypeScriptVersion> =
-	pm.regexp(/\/\/ TypeScript Version: (2.(\d))/, 1).chain<TypeScriptVersion>(v => {
-		switch (v) {
-			case "2.1":
-			case "2.2":
-			case "2.3":
-			case "2.4":
-				return pm.succeed<TypeScriptVersion>(v);
-			default:
-				return pm.fail(`TypeScript ${v} is not yet supported.`);
-		}
-	});
+	pm.regexp(/\/\/ TypeScript Version: (2.(\d))/, 1).chain<TypeScriptVersion>(v =>
+		TypeScriptVersion.all.includes(v as TypeScriptVersion)
+			? pm.succeed(v as TypeScriptVersion)
+			: pm.fail(`TypeScript ${v} is not yet supported.`));
 
 const typeScriptVersionParser: pm.Parser<TypeScriptVersion> =
 	pm.regexp(/\r?\n/)
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..d7b3ff0
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1029 @@
+{
+  "name": "definitelytyped-header-parser",
+  "version": "0.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "@types/mocha": {
+      "version": "2.2.44",
+      "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-2.2.44.tgz",
+      "integrity": "sha512-k2tWTQU8G4+iSMvqKi0Q9IIsWAp/n8xzdZS4Q4YVIltApoMA00wFBFdlJnmoaK1/z7B0Cy0yPe6GgXteSmdUNw==",
+      "dev": true
+    },
+    "@types/node": {
+      "version": "7.0.48",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-7.0.48.tgz",
+      "integrity": "sha512-LLlXafM3BD52MH056tHxTXO8JFCnpJJQkdzIU3+m8ew+CXJY/5zIXgDNb4TK/QFvlI8QexLS5tL+sE0Qhegr1w==",
+      "dev": true
+    },
+    "@types/parsimmon": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/@types/parsimmon/-/parsimmon-1.3.1.tgz",
+      "integrity": "sha512-xSPnj6R/h8ksvfaFwkhfxnSPhd0eRD1LwfB59L3GJuMUe4zjXGUSb3YZ5eUSM8jk4/qH72FtKzOYtLnZh/OgKQ=="
+    },
+    "ansi-regex": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+      "dev": true
+    },
+    "ansi-styles": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.0.tgz",
+      "integrity": "sha512-NnSOmMEYtVR2JVMIGTzynRkkaxtiq1xnFBcdQD/DnNCYPoEPsVJhM98BDyaoNOQIi7p4okdi3E27eN7GQbsUug==",
+      "dev": true,
+      "requires": {
+        "color-convert": "1.9.1"
+      }
+    },
+    "array-filter": {
+      "version": "0.0.1",
+      "resolved": "https://registry.npmjs.org/array-filter/-/array-filter-0.0.1.tgz",
+      "integrity": "sha1-fajPLiZijtcygDWB/SH2fKzS7uw=",
+      "dev": true
+    },
+    "array-map": {
+      "version": "0.0.0",
+      "resolved": "https://registry.npmjs.org/array-map/-/array-map-0.0.0.tgz",
+      "integrity": "sha1-iKK6tz0c97zVwbEYoAP2b2ZfpmI=",
+      "dev": true
+    },
+    "array-reduce": {
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+      "resolved": "https://registry.npmjs.org/array-reduce/-/array-reduce-0.0.0.tgz",
+      "integrity": "sha1-FziZ0//Rx9k4PkR5Ul2+J4yrXys=",
+      "dev": true
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+      "dev": true
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+      "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.26.0.tgz",
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+      "dev": true,
+      "requires": {
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+        "esutils": "2.0.2",
+        "js-tokens": "3.0.2"
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+          "version": "2.2.1",
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+          "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
+          "dev": true
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+          "dev": true,
+          "requires": {
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+            "escape-string-regexp": "1.0.5",
+            "has-ansi": "2.0.0",
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+          "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
+          "dev": true
+        }
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+    },
+    "balanced-match": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
+      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
+      "dev": true
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+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.8.tgz",
+      "integrity": "sha1-wHshHHyVLsH479Uad+8NHTmQopI=",
+      "dev": true,
+      "requires": {
+        "balanced-match": "1.0.0",
+        "concat-map": "0.0.1"
+      }
+    },
+    "browser-stdout": {
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+      "resolved": "https://registry.npmjs.org/browser-stdout/-/browser-stdout-1.3.0.tgz",
+      "integrity": "sha1-81HTKWnTL6XXpVZxVCY9korjvR8=",
+      "dev": true
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+      "integrity": "sha1-Jw8HbFpywC9bZaR9+Uxf46J4iS8=",
+      "dev": true
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+      "integrity": "sha512-Az5zJR2CBujap2rqXGaJKaPHyJ0IrUimvYNX+ncCy8PJP4ltOGTrHUIo097ZaL2zMeKYpiCdqDvS6zdrTFok3Q==",
+      "dev": true,
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+        "escape-string-regexp": "1.0.5",
+        "supports-color": "4.5.0"
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+          "integrity": "sha1-6CB68cx7MNRGzHC3NLXovhj4jVE=",
+          "dev": true
+        },
+        "supports-color": {
+          "version": "4.5.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-4.5.0.tgz",
+          "integrity": "sha1-vnoN5ITexcXN34s9WRJQRJEvY1s=",
+          "dev": true,
+          "requires": {
+            "has-flag": "2.0.0"
+          }
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+      }
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+    "color-convert": {
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+      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.1.tgz",
+      "integrity": "sha512-mjGanIiwQJskCC18rPR6OmrZ6fm2Lc7PeGFYwCmy5J34wC6F1PzdGL6xeMfmgicfYcNLGuVFA3WzXtIDCQSZxQ==",
+      "dev": true,
+      "requires": {
+        "color-name": "1.1.3"
+      }
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+    "color-name": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
+      "integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU=",
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+    },
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+      "integrity": "sha1-nJkJQXbhIkDLItbFFGCYQA/g99Q=",
+      "dev": true,
+      "requires": {
+        "graceful-readlink": "1.0.1"
+      }
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+      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
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+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/ts-node/-/ts-node-3.3.0.tgz",
+      "integrity": "sha1-wTxqMCTjC+EYDdUwOPwgkonUv2k=",
+      "dev": true,
+      "requires": {
+        "arrify": "1.0.1",
+        "chalk": "2.3.0",
+        "diff": "3.2.0",
+        "make-error": "1.3.0",
+        "minimist": "1.2.0",
+        "mkdirp": "0.5.1",
+        "source-map-support": "0.4.18",
+        "tsconfig": "6.0.0",
+        "v8flags": "3.0.1",
+        "yn": "2.0.0"
+      },
+      "dependencies": {
+        "minimist": {
+          "version": "1.2.0",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
+          "dev": true
+        }
+      }
+    },
+    "tsconfig": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/tsconfig/-/tsconfig-6.0.0.tgz",
+      "integrity": "sha1-aw6DdgA9evGGT434+J3QBZ/80DI=",
+      "dev": true,
+      "requires": {
+        "strip-bom": "3.0.0",
+        "strip-json-comments": "2.0.1"
+      }
+    },
+    "tslib": {
+      "version": "1.8.0",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.8.0.tgz",
+      "integrity": "sha512-ymKWWZJST0/CkgduC2qkzjMOWr4bouhuURNXCn/inEX0L57BnRG6FhX76o7FOnsjHazCjfU2LKeSrlS2sIKQJg==",
+      "dev": true
+    },
+    "tslint": {
+      "version": "5.8.0",
+      "resolved": "https://registry.npmjs.org/tslint/-/tslint-5.8.0.tgz",
+      "integrity": "sha1-H0mtWy53x2w69N3K5VKuTjYS6xM=",
+      "dev": true,
+      "requires": {
+        "babel-code-frame": "6.26.0",
+        "builtin-modules": "1.1.1",
+        "chalk": "2.3.0",
+        "commander": "2.9.0",
+        "diff": "3.2.0",
+        "glob": "7.1.1",
+        "minimatch": "3.0.4",
+        "resolve": "1.5.0",
+        "semver": "5.4.1",
+        "tslib": "1.8.0",
+        "tsutils": "2.13.0"
+      }
+    },
+    "tsutils": {
+      "version": "2.13.0",
+      "resolved": "https://registry.npmjs.org/tsutils/-/tsutils-2.13.0.tgz",
+      "integrity": "sha512-FuWzNJbMsp3gcZMbI3b5DomhW4Ia41vMxjN63nKWI0t7f+I3UmHfRl0TrXJTwI2LUduDG+eR1Mksp3pvtlyCFQ==",
+      "dev": true,
+      "requires": {
+        "tslib": "1.8.0"
+      }
+    },
+    "typescript": {
+      "version": "2.7.0-dev.20171129",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-2.7.0-dev.20171129.tgz",
+      "integrity": "sha512-ol/AGcRTNWfQQIyPxeqiDmzKIYmRsCjvAUS5XMpGLNGjelU2GmvJJlwrQP5H2NOCV4njdgF0pgcVrXENRvIVyQ==",
+      "dev": true
+    },
+    "v8flags": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/v8flags/-/v8flags-3.0.1.tgz",
+      "integrity": "sha1-3Oj8N5wX2fLJ6e142JzgAFKxt2s=",
+      "dev": true,
+      "requires": {
+        "homedir-polyfill": "1.0.1"
+      }
+    },
+    "validate-npm-package-license": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.1.tgz",
+      "integrity": "sha1-KAS6vnEq0zeUWaz74kdGqywwP7w=",
+      "dev": true,
+      "requires": {
+        "spdx-correct": "1.0.2",
+        "spdx-expression-parse": "1.0.4"
+      }
+    },
+    "which": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/which/-/which-1.3.0.tgz",
+      "integrity": "sha512-xcJpopdamTuY5duC/KnTTNBraPK54YwpenP4lzxU8H91GudWpFv38u0CKjclE1Wi2EH2EDz5LRcHcKbCIzqGyg==",
+      "dev": true,
+      "requires": {
+        "isexe": "2.0.0"
+      }
+    },
+    "wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
+    },
+    "yallist": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
+      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
+      "dev": true
+    },
+    "yn": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/yn/-/yn-2.0.0.tgz",
+      "integrity": "sha1-5a2ryKz0CPY4X8dklWhMiOavaJo=",
+      "dev": true
+    }
+  }
+}
diff --git a/test/test.ts b/test/test.ts
index 60816bb..3f089b3 100644
--- a/test/test.ts
+++ b/test/test.ts
@@ -77,7 +77,7 @@ describe("parseTypeScriptVersionLine", () => {
 
 describe("tagsToUpdate", () => {
 	it("works", () => {
-		assert.deepEqual(TypeScriptVersion.tagsToUpdate("2.2"), ["ts2.2", "ts2.3", "ts2.4", "ts2.5", "latest"]);
+		assert.deepEqual(TypeScriptVersion.tagsToUpdate("2.5"), ["ts2.5", "ts2.6", "ts2.7", "latest"]);
 	});
 });
 
diff --git a/test/tsconfig.json b/test/tsconfig.json
index 28d4a06..548689a 100644
--- a/test/tsconfig.json
+++ b/test/tsconfig.json
@@ -1,16 +1,14 @@
 {
     "compilerOptions": {
         "module": "commonjs",
-        "target": "es6",
+        "target": "esnext",
         "declaration": true,
 
+        "strict": true,
         "noFallthroughCasesInSwitch": true,
-        "noImplicitAny": true,
         "noImplicitReturns": true,
-        "noImplicitThis": true,
         "noUnusedLocals": true,
-        "noUnusedParameters": true,
-        "strictNullChecks": true
+        "noUnusedParameters": true
     },
     "files": ["test.ts"]
 }
\ No newline at end of file
diff --git a/tsconfig.json b/tsconfig.json
index 111707e..8f4fd74 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,16 +1,14 @@
 {
     "compilerOptions": {
         "module": "commonjs",
-        "target": "es6",
+        "target": "esnext",
         "declaration": true,
 
+        "strict": true,
         "noFallthroughCasesInSwitch": true,
-        "noImplicitAny": true,
         "noImplicitReturns": true,
-        "noImplicitThis": true,
         "noUnusedLocals": true,
-        "noUnusedParameters": true,
-        "strictNullChecks": true
+        "noUnusedParameters": true
     },
     "files": ["index.ts"]
 }
\ No newline at end of file