diff --git a/.travis.yml b/.travis.yml
index 106552317..b4b7dc3af 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,4 +3,4 @@ node_js:
   - "6"
   - "node"
 script:
-- npm build
+- npm test
diff --git a/package-lock.json b/package-lock.json
index 2cb6d7536..ddefdaaaa 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -33,9 +33,9 @@
       "integrity": "sha1-jgvuj33suVIlDaDK6+BeMFkcF+8="
     },
     "@types/doctrine": {
-      "version": "0.0.1",
-      "resolved": "https://registry.npmjs.org/@types/doctrine/-/doctrine-0.0.1.tgz",
-      "integrity": "sha1-uZny2fe0PKvgoaLzm8IDvH3K2p0="
+      "version": "0.0.3",
+      "resolved": "https://registry.npmjs.org/@types/doctrine/-/doctrine-0.0.3.tgz",
+      "integrity": "sha1-6JLSk8ksnB0/mvcsFaVU+8fgiVo="
     },
     "@types/escodegen": {
       "version": "0.0.2",
@@ -55,6 +55,12 @@
       "resolved": "https://registry.npmjs.org/@types/estree/-/estree-0.0.37.tgz",
       "integrity": "sha512-1IT6vNpmU9w18P3v6mN9idv18z5KPVTi4t7+rU9VLnkxo0LCam8IXy/eSVzOaQ1Wpabra2cN3A8K/SliPK/Suw=="
     },
+    "@types/mocha": {
+      "version": "2.2.43",
+      "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-2.2.43.tgz",
+      "integrity": "sha512-xNlAmH+lRJdUMXClMTI9Y0pRqIojdxfm7DHsIxoB2iTzu3fnPmSMEN8SsSx0cdwV36d02PWCWaDUoZPDSln+xw==",
+      "dev": true
+    },
     "@types/node": {
       "version": "6.0.88",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-6.0.88.tgz",
@@ -106,6 +112,31 @@
       "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
       "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4="
     },
+    "anymatch": {
+      "version": "1.3.2",
+      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-1.3.2.tgz",
+      "integrity": "sha512-0XNayC8lTHQ2OI8aljNCN3sSx6hsr/1+rlcDAotXJR7C1oZZHCNsfpbKwMjRA3Uqb5tF1Rae2oloTr4xpq+WjA==",
+      "dev": true,
+      "requires": {
+        "micromatch": "2.3.11",
+        "normalize-path": "2.1.1"
+      }
+    },
+    "arr-diff": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-2.0.0.tgz",
+      "integrity": "sha1-jzuCf5Vai9ZpaX5KQlasPOrjVs8=",
+      "dev": true,
+      "requires": {
+        "arr-flatten": "1.1.0"
+      }
+    },
+    "arr-flatten": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/arr-flatten/-/arr-flatten-1.1.0.tgz",
+      "integrity": "sha512-L3hKV5R/p5o81R7O02IGnwpDmkp6E982XhtbuwSe3O4qOtMMMtodicASA1Cny2U+aCXcNpml+m4dPsvsJ3jatg==",
+      "dev": true
+    },
     "array-back": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/array-back/-/array-back-2.0.0.tgz",
@@ -114,18 +145,42 @@
         "typical": "2.6.1"
       }
     },
+    "array-unique": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/array-unique/-/array-unique-0.2.1.tgz",
+      "integrity": "sha1-odl8yvy8JiXMcPrc6zalDFiwGlM=",
+      "dev": true
+    },
+    "assertion-error": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-1.0.2.tgz",
+      "integrity": "sha1-E8pRXYYgbaC6xm6DTdOX2HWBCUw=",
+      "dev": true
+    },
     "async": {
       "version": "1.5.2",
       "resolved": "https://registry.npmjs.org/async/-/async-1.5.2.tgz",
       "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
       "dev": true
     },
+    "async-each": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/async-each/-/async-each-1.0.1.tgz",
+      "integrity": "sha1-GdOGodntxufByF04iu28xW0zYC0=",
+      "dev": true
+    },
     "balanced-match": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
       "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
       "dev": true
     },
+    "binary-extensions": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-1.10.0.tgz",
+      "integrity": "sha1-muuabF6IY4qtFx4Wf1kAq+JINdA=",
+      "dev": true
+    },
     "brace-expansion": {
       "version": "1.1.8",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.8.tgz",
@@ -136,12 +191,37 @@
         "concat-map": "0.0.1"
       }
     },
+    "braces": {
+      "version": "1.8.5",
+      "resolved": "https://registry.npmjs.org/braces/-/braces-1.8.5.tgz",
+      "integrity": "sha1-uneWLhLf+WnWt2cR6RS3N4V79qc=",
+      "dev": true,
+      "requires": {
+        "expand-range": "1.8.2",
+        "preserve": "0.2.0",
+        "repeat-element": "1.1.2"
+      }
+    },
     "browser-stdout": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/browser-stdout/-/browser-stdout-1.3.0.tgz",
       "integrity": "sha1-81HTKWnTL6XXpVZxVCY9korjvR8=",
       "dev": true
     },
+    "chai": {
+      "version": "4.1.2",
+      "resolved": "https://registry.npmjs.org/chai/-/chai-4.1.2.tgz",
+      "integrity": "sha1-D2RYS6ZC8PKs4oBiefTwbKI61zw=",
+      "dev": true,
+      "requires": {
+        "assertion-error": "1.0.2",
+        "check-error": "1.0.2",
+        "deep-eql": "3.0.1",
+        "get-func-name": "2.0.0",
+        "pathval": "1.1.0",
+        "type-detect": "4.0.3"
+      }
+    },
     "chalk": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
@@ -161,6 +241,29 @@
         }
       }
     },
+    "check-error": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/check-error/-/check-error-1.0.2.tgz",
+      "integrity": "sha1-V00xLt2Iu13YkS6Sht1sCu1KrII=",
+      "dev": true
+    },
+    "chokidar": {
+      "version": "1.7.0",
+      "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-1.7.0.tgz",
+      "integrity": "sha1-eY5ol3gVHIB2tLNg5e3SjNortGg=",
+      "dev": true,
+      "requires": {
+        "anymatch": "1.3.2",
+        "async-each": "1.0.1",
+        "fsevents": "1.1.2",
+        "glob-parent": "2.0.0",
+        "inherits": "2.0.3",
+        "is-binary-path": "1.0.1",
+        "is-glob": "2.0.1",
+        "path-is-absolute": "1.0.1",
+        "readdirp": "2.1.0"
+      }
+    },
     "clang-format": {
       "version": "1.0.55",
       "resolved": "https://registry.npmjs.org/clang-format/-/clang-format-1.0.55.tgz",
@@ -177,6 +280,15 @@
       "resolved": "https://registry.npmjs.org/clone/-/clone-2.1.1.tgz",
       "integrity": "sha1-0hfR6WERjjrJpLi7oyhVU79kfNs="
     },
+    "combined-stream": {
+      "version": "0.0.7",
+      "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-0.0.7.tgz",
+      "integrity": "sha1-ATfmV7qlp1QcV6w3rF/AfXO03B8=",
+      "dev": true,
+      "requires": {
+        "delayed-stream": "0.0.5"
+      }
+    },
     "command-line-args": {
       "version": "4.0.7",
       "resolved": "https://registry.npmjs.org/command-line-args/-/command-line-args-4.0.7.tgz",
@@ -207,12 +319,30 @@
         "graceful-readlink": "1.0.1"
       }
     },
+    "component-emitter": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/component-emitter/-/component-emitter-1.2.1.tgz",
+      "integrity": "sha1-E3kY1teCg/ffemt8WmPhQOaUJeY=",
+      "dev": true
+    },
     "concat-map": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
       "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
       "dev": true
     },
+    "cookiejar": {
+      "version": "2.0.6",
+      "resolved": "https://registry.npmjs.org/cookiejar/-/cookiejar-2.0.6.tgz",
+      "integrity": "sha1-Cr81atANHFohnYjURRgEbdAmrP4=",
+      "dev": true
+    },
+    "core-util-is": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
+      "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
+      "dev": true
+    },
     "cssbeautify": {
       "version": "0.3.1",
       "resolved": "https://registry.npmjs.org/cssbeautify/-/cssbeautify-0.3.1.tgz",
@@ -227,6 +357,15 @@
         "ms": "2.0.0"
       }
     },
+    "deep-eql": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/deep-eql/-/deep-eql-3.0.1.tgz",
+      "integrity": "sha512-+QeIQyN5ZuO+3Uk5DYh6/1eKO0m0YmJFGNmFHGACpf1ClL1nmlV/p4gNgbl2pJGxgXb4faqo6UE+M5ACEMyVcw==",
+      "dev": true,
+      "requires": {
+        "type-detect": "4.0.3"
+      }
+    },
     "deep-extend": {
       "version": "0.5.0",
       "resolved": "https://registry.npmjs.org/deep-extend/-/deep-extend-0.5.0.tgz",
@@ -237,6 +376,12 @@
       "resolved": "https://registry.npmjs.org/deep-is/-/deep-is-0.1.3.tgz",
       "integrity": "sha1-s2nW+128E+7PUk+RsHD+7cNXzzQ="
     },
+    "delayed-stream": {
+      "version": "0.0.5",
+      "resolved": "https://registry.npmjs.org/delayed-stream/-/delayed-stream-0.0.5.tgz",
+      "integrity": "sha1-1LH0OpPoKW3+AmlPRoC8N6MTxz8=",
+      "dev": true
+    },
     "diff": {
       "version": "3.2.0",
       "resolved": "https://registry.npmjs.org/diff/-/diff-3.2.0.tgz",
@@ -305,11 +450,63 @@
       "resolved": "https://registry.npmjs.org/esutils/-/esutils-2.0.2.tgz",
       "integrity": "sha1-Cr9PHKpbyx96nYrMbepPqqBLrJs="
     },
+    "expand-brackets": {
+      "version": "0.1.5",
+      "resolved": "https://registry.npmjs.org/expand-brackets/-/expand-brackets-0.1.5.tgz",
+      "integrity": "sha1-3wcoTjQqgHzXM6xa9yQR5YHRF3s=",
+      "dev": true,
+      "requires": {
+        "is-posix-bracket": "0.1.1"
+      }
+    },
+    "expand-range": {
+      "version": "1.8.2",
+      "resolved": "https://registry.npmjs.org/expand-range/-/expand-range-1.8.2.tgz",
+      "integrity": "sha1-opnv/TNf4nIeuujiV+x5ZE/IUzc=",
+      "dev": true,
+      "requires": {
+        "fill-range": "2.2.3"
+      }
+    },
+    "extend": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/extend/-/extend-3.0.0.tgz",
+      "integrity": "sha1-WkdDU7nzNT3dgXbf03uRyDpG8dQ=",
+      "dev": true
+    },
+    "extglob": {
+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/extglob/-/extglob-0.3.2.tgz",
+      "integrity": "sha1-Lhj/PS9JqydlzskCPwEdqo2DSaE=",
+      "dev": true,
+      "requires": {
+        "is-extglob": "1.0.0"
+      }
+    },
     "fast-levenshtein": {
       "version": "2.0.6",
       "resolved": "https://registry.npmjs.org/fast-levenshtein/-/fast-levenshtein-2.0.6.tgz",
       "integrity": "sha1-PYpcZog6FqMMqGQ+hR8Zuqd5eRc="
     },
+    "filename-regex": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/filename-regex/-/filename-regex-2.0.1.tgz",
+      "integrity": "sha1-wcS5vuPglyXdsQa3XB4wH+LxiyY=",
+      "dev": true
+    },
+    "fill-range": {
+      "version": "2.2.3",
+      "resolved": "https://registry.npmjs.org/fill-range/-/fill-range-2.2.3.tgz",
+      "integrity": "sha1-ULd9/X5Gm8dJJHCWNpn+eoSFpyM=",
+      "dev": true,
+      "requires": {
+        "is-number": "2.1.0",
+        "isobject": "2.1.0",
+        "randomatic": "1.1.7",
+        "repeat-element": "1.1.2",
+        "repeat-string": "1.6.1"
+      }
+    },
     "find-replace": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/find-replace/-/find-replace-1.0.3.tgz",
@@ -329,12 +526,957 @@
         }
       }
     },
+    "for-in": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/for-in/-/for-in-1.0.2.tgz",
+      "integrity": "sha1-gQaNKVqBQuwKxybG4iAMMPttXoA=",
+      "dev": true
+    },
+    "for-own": {
+      "version": "0.1.5",
+      "resolved": "https://registry.npmjs.org/for-own/-/for-own-0.1.5.tgz",
+      "integrity": "sha1-UmXGgaTylNq78XyVCbZ2OqhFEM4=",
+      "dev": true,
+      "requires": {
+        "for-in": "1.0.2"
+      }
+    },
+    "form-data": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/form-data/-/form-data-0.2.0.tgz",
+      "integrity": "sha1-Jvi8JtpkQOKZy9z7aQNcT3em5GY=",
+      "dev": true,
+      "requires": {
+        "async": "0.9.2",
+        "combined-stream": "0.0.7",
+        "mime-types": "2.0.14"
+      },
+      "dependencies": {
+        "async": {
+          "version": "0.9.2",
+          "resolved": "https://registry.npmjs.org/async/-/async-0.9.2.tgz",
+          "integrity": "sha1-rqdNXmHB+JlhO/ZL2mbUx48v0X0=",
+          "dev": true
+        }
+      }
+    },
+    "formidable": {
+      "version": "1.0.17",
+      "resolved": "https://registry.npmjs.org/formidable/-/formidable-1.0.17.tgz",
+      "integrity": "sha1-71SRSQ+UM7cF+qdyScmQKa40hVk=",
+      "dev": true
+    },
     "fs.realpath": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz",
       "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8=",
       "dev": true
     },
+    "fsevents": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-1.1.2.tgz",
+      "integrity": "sha512-Sn44E5wQW4bTHXvQmvSHwqbuiXtduD6Rrjm2ZtUEGbyrig+nUH3t/QD4M4/ZXViY556TBpRgZkHLDx3JxPwxiw==",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "nan": "2.7.0",
+        "node-pre-gyp": "0.6.36"
+      },
+      "dependencies": {
+        "abbrev": {
+          "version": "1.1.0",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "ajv": {
+          "version": "4.11.8",
+          "bundled": true,
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "co": "4.6.0",
+            "json-stable-stringify": "1.0.1"
+          }
+        },
+        "ansi-regex": {
+          "version": "2.1.1",
+          "bundled": true,
+          "dev": true
+        },
+        "aproba": {
+          "version": "1.1.1",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "are-we-there-yet": {
+          "version": "1.1.4",
+          "bundled": true,
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "delegates": "1.0.0",
+            "readable-stream": "2.2.9"
+          }
+        },
+        "asn1": {
+          "version": "0.2.3",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "assert-plus": {
+          "version": "0.2.0",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "asynckit": {
+          "version": "0.4.0",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "aws-sign2": {
+          "version": "0.6.0",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "aws4": {
+          "version": "1.6.0",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "balanced-match": {
+          "version": "0.4.2",
+          "bundled": true,
+          "dev": true
+        },
+        "bcrypt-pbkdf": {
+          "version": "1.0.1",
+          "bundled": true,
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "tweetnacl": "0.14.5"
+          }
+        },
+        "block-stream": {
+          "version": "0.0.9",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "inherits": "2.0.3"
+          }
+        },
+        "boom": {
+          "version": "2.10.1",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "hoek": "2.16.3"
+          }
+        },
+        "brace-expansion": {
+          "version": "1.1.7",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "balanced-match": "0.4.2",
+            "concat-map": "0.0.1"
+          }
+        },
+        "buffer-shims": {
+          "version": "1.0.0",
+          "bundled": true,
+          "dev": true
+        },
+        "caseless": {
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+          "dev": true,
+          "optional": true
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+        "co": {
+          "version": "4.6.0",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "code-point-at": {
+          "version": "1.1.0",
+          "bundled": true,
+          "dev": true
+        },
+        "combined-stream": {
+          "version": "1.0.5",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "delayed-stream": "1.0.0"
+          }
+        },
+        "concat-map": {
+          "version": "0.0.1",
+          "bundled": true,
+          "dev": true
+        },
+        "console-control-strings": {
+          "version": "1.1.0",
+          "bundled": true,
+          "dev": true
+        },
+        "core-util-is": {
+          "version": "1.0.2",
+          "bundled": true,
+          "dev": true
+        },
+        "cryptiles": {
+          "version": "2.0.5",
+          "bundled": true,
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "boom": "2.10.1"
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+        "dashdash": {
+          "version": "1.14.1",
+          "bundled": true,
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "assert-plus": "1.0.0"
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+              "version": "1.0.0",
+              "bundled": true,
+              "dev": true,
+              "optional": true
+            }
+          }
+        },
+        "debug": {
+          "version": "2.6.8",
+          "bundled": true,
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "ms": "2.0.0"
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+        },
+        "deep-extend": {
+          "version": "0.4.2",
+          "bundled": true,
+          "dev": true,
+          "optional": true
+        },
+        "delayed-stream": {
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+          "requires": {
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+        "wrappy": {
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+          "bundled": true,
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+      "dev": true
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       "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.2.tgz",
@@ -349,6 +1491,31 @@
         "path-is-absolute": "1.0.1"
       }
     },
+    "glob-base": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/glob-base/-/glob-base-0.3.0.tgz",
+      "integrity": "sha1-27Fk9iIbHAscz4Kuoyi0l98Oo8Q=",
+      "dev": true,
+      "requires": {
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+      "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-2.0.0.tgz",
+      "integrity": "sha1-gTg9ctsFT8zPUzbaqQLxgvbtuyg=",
+      "dev": true,
+      "requires": {
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+      }
+    },
+    "graceful-fs": {
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+      "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.1.11.tgz",
+      "integrity": "sha1-Dovf5NHduIVNZOBOp8AOKgJuVlg=",
+      "dev": true
+    },
     "graceful-readlink": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/graceful-readlink/-/graceful-readlink-1.0.1.tgz",
@@ -381,6 +1548,12 @@
       "integrity": "sha1-k0EP0hsAlzUVH4howvJx80J+I/0=",
       "dev": true
     },
+    "herit": {
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+      "resolved": "https://registry.npmjs.org/herit/-/herit-2.2.2.tgz",
+      "integrity": "sha1-DhGb3K6AfKLqbV2VwWt1x7Bj6Yc=",
+      "dev": true
+    },
     "inflight": {
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       "resolved": "https://registry.npmjs.org/inflight/-/inflight-1.0.6.tgz",
@@ -397,11 +1570,92 @@
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       "dev": true
     },
+    "is-binary-path": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/is-binary-path/-/is-binary-path-1.0.1.tgz",
+      "integrity": "sha1-dfFmQrSA8YenEcgUFh/TpKdlWJg=",
+      "dev": true,
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+        },
+        "string_decoder": {
+          "version": "0.10.31",
+          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
+          "integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ=",
+          "dev": true
+        }
+      }
+    },
     "supports-color": {
       "version": "3.1.2",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-3.1.2.tgz",
@@ -720,6 +2323,12 @@
         "prelude-ls": "1.1.2"
       }
     },
+    "type-detect": {
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.3.tgz",
+      "integrity": "sha1-Dj8mcLRAmbC0bChNE2p+9Jx0wuo=",
+      "dev": true
+    },
     "typescript": {
       "version": "2.5.3",
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-2.5.3.tgz",
@@ -731,6 +2340,31 @@
       "resolved": "https://registry.npmjs.org/typical/-/typical-2.6.1.tgz",
       "integrity": "sha1-XAgOXWYcu+OCWdLnCjxyU+hziB0="
     },
+    "underscore": {
+      "version": "1.8.3",
+      "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.8.3.tgz",
+      "integrity": "sha1-Tz+1OxBuYJf8+ctBCfKl6b36UCI=",
+      "dev": true
+    },
+    "util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
+      "dev": true
+    },
+    "watchy": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/watchy/-/watchy-0.7.0.tgz",
+      "integrity": "sha512-/9DPISHCreOYgcD3jXZI7Rfcu+bV1HYmoapWubFzolvXcGjEW7nl2VIzwleKc4T9/lNyDLe8H8As5bHi85Tj/A==",
+      "dev": true,
+      "requires": {
+        "chokidar": "1.7.0",
+        "commander": "2.9.0",
+        "herit": "2.2.2",
+        "orgsync-logger": "1.4.0",
+        "underscore": "1.8.3"
+      }
+    },
     "wordwrap": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
diff --git a/package.json b/package.json
index 02e5b608c..036997c14 100644
--- a/package.json
+++ b/package.json
@@ -9,22 +9,30 @@
     "lib": "lib"
   },
   "dependencies": {
+    "@types/doctrine": "0.0.3",
     "command-line-args": "^4.0.7",
     "command-line-usage": "^4.0.1",
+    "doctrine": "^2.0.0",
     "escodegen": "^1.9.0",
     "polymer-analyzer": "^2.3.0"
   },
   "devDependencies": {
+    "@types/chai": "^4.0.4",
+    "@types/mocha": "^2.2.43",
+    "chai": "^4.1.2",
     "clang-format": "^1.0.55",
     "mocha": "^3.5.3",
-    "typescript": "^2.5.3"
+    "source-map-support": "^0.5.0",
+    "typescript": "^2.5.3",
+    "watchy": "^0.7.0"
   },
   "scripts": {
     "clean": "rm -rf lib",
     "format": "find src -name '*.ts' | xargs clang-format --style=file -i",
     "build": "npm run clean && tsc",
     "build:watch": "tsc --watch",
-    "test": "npm run build && mocha"
+    "test": "npm run build && mocha",
+    "test:watch": "watchy -w src -- npm run test"
   },
   "repository": {
     "type": "git",
diff --git a/src/closure-types.ts b/src/closure-types.ts
new file mode 100644
index 000000000..cb5c3ce72
--- /dev/null
+++ b/src/closure-types.ts
@@ -0,0 +1,167 @@
+/**
+ * @license
+ * Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
+ * This code may only be used under the BSD style license found at
+ * http://polymer.github.io/LICENSE.txt The complete set of authors may be found
+ * at http://polymer.github.io/AUTHORS.txt The complete set of contributors may
+ * be found at http://polymer.github.io/CONTRIBUTORS.txt Code distributed by
+ * Google as part of the polymer project is also subject to an additional IP
+ * rights grant found at http://polymer.github.io/PATENTS.txt
+ */
+
+// TODO Object<foo>, Object<foo, bar>
+// TODO Record types
+// TODO Optional param =
+// TODO Function variadic parameters
+//
+// Useful resources for working on this package:
+// https://eslint.org/doctrine/demo/
+// https://github.com/google/closure-compiler/wiki/Types-in-the-Closure-Type-System
+
+import * as doctrine from 'doctrine';
+const {parseType} = require('doctrine/lib/typed.js');
+
+/**
+ * Convert from a type annotation in Closure syntax to TypeScript syntax (e.g
+ * `Array<string>` => `string[]|null`).
+ */
+export function closureTypeToTypeScript(closureType: string): string {
+  const ast = parseType(closureType);
+  return serialize(ast);
+}
+
+/**
+ * Format the given Closure type expression AST node as a TypeScript type
+ * annotation string.
+ */
+function serialize(node: doctrine.Type): string {
+  let t = '';
+
+  let nullable = null;
+
+  if (isNullable(node)) {  // ?foo
+    nullable = true;
+    node = node.expression;
+  } else if (isNonNullable(node)) {  // !foo
+    nullable = false;
+    node = node.expression;
+  }
+
+  if (isArray(node)) {  // Array<foo>
+    t = serializeArray(node);
+  } else if (isUnion(node)) {  // foo|bar
+    t = serializeUnion(node);
+  } else if (isFunction(node)) {  // function(foo): bar
+    t = serializeFunction(node);
+  } else if (isAllLiteral(node)) {  // *
+    t = 'any';
+  } else if (isNullableLiteral(node)) {  // ?
+    t = 'any';
+  } else if (isNullLiteral(node)) {  // null
+    t = 'null';
+  } else if (isUndefinedLiteral(node)) {  // undefined
+    t = 'undefined';
+  } else if (isName(node)) {  // string, Object, MyClass, etc.
+    t = node.name;
+  } else {
+    console.error('Unknown syntax.');
+    return '';
+  }
+
+  if (nullable === true || (nullable === null && nullableByDefault(node))) {
+    t = `${t}|null`;
+  }
+  return t;
+}
+
+/**
+ * Return whether the given AST node is an expression that is nullable by
+ * default in the Closure type system.
+ */
+function nullableByDefault(node: doctrine.Type): boolean {
+  if (isName(node)) {
+    switch (node.name) {
+      case 'string':
+      case 'number':
+      case 'boolean':
+        return false
+    }
+    return true;
+  }
+  return isArray(node);
+}
+
+function serializeArray(node: doctrine.type.TypeApplication): string {
+  if (node.applications.length !== 1) {
+    console.error('Invalid array expression.');
+    return '';
+  }
+  return serialize(node.applications[0]) + '[]';
+}
+
+function serializeUnion(node: doctrine.type.UnionType): string {
+  if (node.elements.length === 1) {
+    // `(string)` will be represented as a union of length one. Just flatten.
+    return serialize(node.elements[0]);
+  }
+  return '(' + node.elements.map(e => serialize(e)).join('|') + ')';
+}
+
+function serializeFunction(node: doctrine.type.FunctionType): string {
+  let out = '(';
+  for (let i = 0; i < node.params.length; i++) {
+    if (i > 0) {
+      out += ', ';
+    }
+    out += `p${i}: ${serialize(node.params[i])}`;
+  }
+  // Casting because typings are wrong: `FunctionType.result` is not an array.
+  const result = node.result as any;
+  out += ') => ' + (result && serialize(result) || 'any');
+  return out;
+}
+
+function isArray(node: doctrine.Type): node is doctrine.type.TypeApplication {
+  return node.type === 'TypeApplication' &&
+      node.expression.type === 'NameExpression' &&
+      node.expression.name === 'Array';
+}
+
+function isUnion(node: doctrine.Type): node is doctrine.type.UnionType {
+  return node.type === 'UnionType';
+}
+
+function isFunction(node: doctrine.Type): node is doctrine.type.FunctionType {
+  return node.type === 'FunctionType';
+}
+
+function isNullable(node: doctrine.Type): node is doctrine.type.NullableType {
+  return node.type === 'NullableType';
+}
+
+function isNonNullable(node: doctrine.Type):
+    node is doctrine.type.NonNullableType {
+  return node.type === 'NonNullableType';
+}
+
+function isAllLiteral(node: doctrine.Type): node is doctrine.type.AllLiteral {
+  return node.type === 'AllLiteral';
+}
+
+function isNullLiteral(node: doctrine.Type): node is doctrine.type.NullLiteral {
+  return node.type === 'NullLiteral';
+}
+
+function isNullableLiteral(node: doctrine.Type):
+    node is doctrine.type.NullableLiteral {
+  return node.type === 'NullableLiteral';
+}
+
+function isUndefinedLiteral(node: doctrine.Type):
+    node is doctrine.type.UndefinedLiteral {
+  return node.type === 'UndefinedLiteral';
+}
+
+function isName(node: doctrine.Type): node is doctrine.type.NameExpression {
+  return node.type === 'NameExpression';
+}
diff --git a/src/test/closure-types_test.ts b/src/test/closure-types_test.ts
new file mode 100644
index 000000000..dfe6f2c5f
--- /dev/null
+++ b/src/test/closure-types_test.ts
@@ -0,0 +1,92 @@
+/**
+ * @license
+ * Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
+ * This code may only be used under the BSD style license found at
+ * http://polymer.github.io/LICENSE.txt The complete set of authors may be found
+ * at http://polymer.github.io/AUTHORS.txt The complete set of contributors may
+ * be found at http://polymer.github.io/CONTRIBUTORS.txt Code distributed by
+ * Google as part of the polymer project is also subject to an additional IP
+ * rights grant found at http://polymer.github.io/PATENTS.txt
+ */
+
+import {assert} from 'chai';
+
+import {closureTypeToTypeScript} from '../closure-types';
+
+suite('closureTypeToTypeScript', () => {
+
+  function check(closureType: string, expectedType: string) {
+    const actualType = closureTypeToTypeScript(closureType);
+    assert.equal(actualType, expectedType);
+  }
+
+  test('primitives', () => {
+    check('string', 'string');
+    check('boolean', 'boolean');
+    check('number', 'number');
+  });
+
+  test('nullable primitives', () => {
+    check('?string', 'string|null');
+    check('?boolean', 'boolean|null');
+    check('?string', 'string|null');
+  });
+
+  test('all type', () => {
+    check('*', 'any');
+  });
+
+  test('unknown type', () => {
+    check('?', 'any');
+  });
+
+  test('null', () => {
+    check('null', 'null');
+  });
+
+  test('undefined', () => {
+    check('undefined', 'undefined');
+  });
+
+  test('nullable object', () => {
+    check('Object', 'Object|null');
+    check('?Object', 'Object|null');
+  });
+
+  test('non-nullable object', () => {
+    check('!Object', 'Object');
+  });
+
+  test('nullable array', () => {
+    check('Array<string>', 'string[]|null');
+    check('?Array<string>', 'string[]|null');
+  });
+
+  test('non-nullable array', () => {
+    check('!Array<string>', 'string[]');
+  });
+
+  test('union', () => {
+    check('string|number', '(string|number)');
+  });
+
+  test('paren flattening', () => {
+    check('(string)', 'string');
+  });
+
+  test('nested array', () => {
+    check('!Array<!Array<string>>', 'string[][]');
+  });
+
+  test('array union', () => {
+    check('!Array<string|number>', '(string|number)[]');
+  });
+
+  test('function', () => {
+    check('function()', '() => any');
+
+    check(
+        'function(string, number): boolean',
+        '(p0: string, p1: number) => boolean');
+  });
+});
diff --git a/test/mocha.opts b/test/mocha.opts
new file mode 100644
index 000000000..bc12d9c58
--- /dev/null
+++ b/test/mocha.opts
@@ -0,0 +1,3 @@
+--ui tdd
+--require source-map-support/register
+lib/test/**/*_test.js