diff --git a/package-lock.json b/package-lock.json
index 0642f0547..89cce1f22 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,6 +10,15 @@
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       "dev": true
     },
+    "@types/buffer-from": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@types/buffer-from/-/buffer-from-1.1.0.tgz",
+      "integrity": "sha512-BLFpLBcN+RPKUsFxqRkMiwqTOOdi+TrKr5OpLJ9qCnUdSxS6S80+QRX/mIhfR66u0Ykc4QTkReaejOM2ILh+9Q==",
+      "dev": true,
+      "requires": {
+        "@types/node": "*"
+      }
+    },
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       "resolved": "https://registry.npmjs.org/@types/chai/-/chai-4.0.10.tgz",
@@ -31,10 +40,10 @@
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       "resolved": "https://registry.npmjs.org/@types/mkdirp/-/mkdirp-0.5.2.tgz",
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+      "integrity": "sha1-UDqs/lzCcD1UhDJrGyfvpnoznB8=",
       "dev": true,
       "requires": {
-        "@types/node": "10.0.3"
+        "@types/node": "*"
       }
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@@ -52,7 +61,7 @@
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+      "integrity": "sha1-BaZHuw2P5I/I7cwZPkPMeTEPqn0=",
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@@ -73,11 +82,12 @@
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       "dev": true,
       "requires": {
-        "@types/node": "10.0.3"
+        "@types/node": "*"
       }
     },
     "@types/yn": {
       "version": "github:types/npm-yn#ca75f6c82940fae6a06fb41d2d37a6aa9b4ea8e9",
+      "from": "@types/yn@github:types/npm-yn#ca75f6c82940fae6a06fb41d2d37a6aa9b4ea8e9",
       "dev": true
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@@ -92,9 +102,9 @@
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       "dev": true,
       "requires": {
-        "kind-of": "3.2.2",
-        "longest": "1.0.1",
-        "repeat-string": "1.6.1"
+        "kind-of": "^3.0.2",
+        "longest": "^1.0.1",
+        "repeat-string": "^1.5.2"
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@@ -115,7 +125,7 @@
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       "dev": true,
       "requires": {
-        "color-convert": "1.9.1"
+        "color-convert": "^1.9.0"
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@@ -124,7 +134,7 @@
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       "dev": true,
       "requires": {
-        "sprintf-js": "1.0.3"
+        "sprintf-js": "~1.0.2"
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@@ -156,9 +166,9 @@
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       "dev": true,
       "requires": {
-        "chalk": "1.1.3",
-        "esutils": "2.0.2",
-        "js-tokens": "3.0.2"
+        "chalk": "^1.1.3",
+        "esutils": "^2.0.2",
+        "js-tokens": "^3.0.2"
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@@ -173,11 +183,11 @@
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-            "escape-string-regexp": "1.0.5",
-            "has-ansi": "2.0.0",
-            "strip-ansi": "3.0.1",
-            "supports-color": "2.0.0"
+            "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"
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@@ -200,7 +210,7 @@
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       "dev": true,
       "requires": {
-        "balanced-match": "1.0.0",
+        "balanced-match": "^1.0.0",
         "concat-map": "0.0.1"
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@@ -211,9 +221,9 @@
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-      "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.0.0.tgz",
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+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.0.tgz",
+      "integrity": "sha512-c5mRlguI/Pe2dSZmpER62rSCu0ryKmWddzRYsuXc50U2/g8jMOulc31VZMa4mYx31U5xsmSOpDCgH88Vl9cDGQ=="
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@@ -235,8 +245,8 @@
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-        "align-text": "0.1.4",
-        "lazy-cache": "1.0.4"
+        "align-text": "^0.1.3",
+        "lazy-cache": "^1.0.3"
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@@ -245,12 +255,12 @@
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-        "deep-eql": "3.0.1",
-        "get-func-name": "2.0.0",
-        "pathval": "1.1.0",
-        "type-detect": "4.0.5"
+        "assertion-error": "^1.0.1",
+        "check-error": "^1.0.1",
+        "deep-eql": "^3.0.0",
+        "get-func-name": "^2.0.0",
+        "pathval": "^1.0.0",
+        "type-detect": "^4.0.0"
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@@ -259,9 +269,9 @@
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       "requires": {
-        "ansi-styles": "3.2.0",
-        "escape-string-regexp": "1.0.5",
-        "supports-color": "4.5.0"
+        "ansi-styles": "^3.1.0",
+        "escape-string-regexp": "^1.0.5",
+        "supports-color": "^4.0.0"
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@@ -277,8 +287,8 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "center-align": "0.1.3",
-        "right-align": "0.1.3",
+        "center-align": "^0.1.1",
+        "right-align": "^0.1.1",
         "wordwrap": "0.0.2"
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@@ -297,7 +307,7 @@
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       "dev": true,
       "requires": {
-        "color-name": "1.1.3"
+        "color-name": "^1.1.1"
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@@ -327,7 +337,7 @@
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@@ -343,10 +353,10 @@
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+      "integrity": "sha1-38lARACtHI/gI+faHfHBR8S0RN8=",
       "dev": true,
       "requires": {
-        "type-detect": "4.0.5"
+        "type-detect": "^4.0.0"
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@@ -366,7 +376,7 @@
       "integrity": "sha1-fLhgNZujvpDgQLJrcpzkv6ZUxSM=",
       "dev": true,
       "requires": {
-        "esutils": "1.1.6",
+        "esutils": "^1.1.6",
         "isarray": "0.0.1"
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@@ -384,7 +394,7 @@
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       "dev": true,
       "requires": {
-        "iconv-lite": "0.4.19"
+        "iconv-lite": "~0.4.13"
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@@ -399,11 +409,11 @@
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       "dev": true,
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-        "estraverse": "1.9.3",
-        "esutils": "2.0.2",
-        "optionator": "0.8.2",
-        "source-map": "0.2.0"
+        "esprima": "^2.7.1",
+        "estraverse": "^1.9.1",
+        "esutils": "^2.0.2",
+        "optionator": "^0.8.1",
+        "source-map": "~0.2.0"
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@@ -413,7 +423,7 @@
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           "optional": true,
           "requires": {
-            "amdefine": "1.0.1"
+            "amdefine": ">=0.0.4"
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@@ -448,13 +458,13 @@
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       "dev": true,
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-        "core-js": "1.2.7",
-        "isomorphic-fetch": "2.2.1",
-        "loose-envify": "1.3.1",
-        "object-assign": "4.1.1",
-        "promise": "7.3.1",
-        "setimmediate": "1.0.5",
-        "ua-parser-js": "0.7.17"
+        "core-js": "^1.0.0",
+        "isomorphic-fetch": "^2.1.1",
+        "loose-envify": "^1.0.0",
+        "object-assign": "^4.1.0",
+        "promise": "^7.1.1",
+        "setimmediate": "^1.0.5",
+        "ua-parser-js": "^0.7.9"
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@@ -463,8 +473,8 @@
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       "dev": true,
       "requires": {
-        "is-object": "1.0.1",
-        "merge-descriptors": "1.0.1"
+        "is-object": "~1.0.1",
+        "merge-descriptors": "~1.0.0"
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@@ -485,11 +495,11 @@
       "integrity": "sha1-G8k2ueAvSmA/zCIuz3Yz0wuLk7E=",
       "dev": true,
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-        "inherits": "2.0.3",
-        "minimatch": "3.0.4",
-        "once": "1.4.0",
-        "path-is-absolute": "1.0.1"
+        "inflight": "^1.0.4",
+        "inherits": "2",
+        "minimatch": "2 || 3",
+        "once": "^1.3.0",
+        "path-is-absolute": "^1.0.0"
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-        "async": "1.5.2",
-        "optimist": "0.6.1",
-        "source-map": "0.4.4",
-        "uglify-js": "2.8.29"
+        "async": "^1.4.0",
+        "optimist": "^0.6.1",
+        "source-map": "^0.4.4",
+        "uglify-js": "^2.6"
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@@ -516,7 +526,7 @@
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           "dev": true,
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-            "amdefine": "1.0.1"
+            "amdefine": ">=0.0.4"
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@@ -527,7 +537,7 @@
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       "dev": true,
       "requires": {
-        "ansi-regex": "2.1.1"
+        "ansi-regex": "^2.0.0"
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@@ -554,8 +564,8 @@
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       "dev": true,
       "requires": {
-        "once": "1.4.0",
-        "wrappy": "1.0.2"
+        "once": "^1.3.0",
+        "wrappy": "1"
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+      "integrity": "sha1-76ouqdqg16suoTqXsritUf776L4=",
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@@ -600,8 +610,8 @@
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       "dev": true,
       "requires": {
-        "node-fetch": "1.7.3",
-        "whatwg-fetch": "2.0.3"
+        "node-fetch": "^1.0.1",
+        "whatwg-fetch": ">=0.10.0"
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@@ -610,20 +620,20 @@
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-        "async": "1.5.2",
-        "escodegen": "1.8.1",
-        "esprima": "2.7.3",
-        "glob": "5.0.15",
-        "handlebars": "4.0.11",
-        "js-yaml": "3.10.0",
-        "mkdirp": "0.5.1",
-        "nopt": "3.0.6",
-        "once": "1.4.0",
-        "resolve": "1.1.7",
-        "supports-color": "3.2.3",
-        "which": "1.3.0",
-        "wordwrap": "1.0.0"
+        "abbrev": "1.0.x",
+        "async": "1.x",
+        "escodegen": "1.8.x",
+        "esprima": "2.7.x",
+        "glob": "^5.0.15",
+        "handlebars": "^4.0.1",
+        "js-yaml": "3.x",
+        "mkdirp": "0.5.x",
+        "nopt": "3.x",
+        "once": "1.x",
+        "resolve": "1.1.x",
+        "supports-color": "^3.1.0",
+        "which": "^1.1.1",
+        "wordwrap": "^1.0.0"
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@@ -638,7 +648,7 @@
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           "dev": true,
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-            "has-flag": "1.0.0"
+            "has-flag": "^1.0.0"
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@@ -655,14 +665,14 @@
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-        "argparse": "1.0.9",
-        "esprima": "4.0.0"
+        "argparse": "^1.0.7",
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+          "integrity": "sha1-RJnt3NERDgshi6zy+n9/WfVcqAQ=",
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@@ -673,7 +683,7 @@
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       "dev": true,
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-        "is-buffer": "1.1.6"
+        "is-buffer": "^1.1.5"
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@@ -689,8 +699,8 @@
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       "dev": true,
       "requires": {
-        "prelude-ls": "1.1.2",
-        "type-check": "0.3.2"
+        "prelude-ls": "~1.1.2",
+        "type-check": "~0.3.2"
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@@ -705,7 +715,7 @@
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       "dev": true,
       "requires": {
-        "js-tokens": "3.0.2"
+        "js-tokens": "^3.0.0"
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@@ -722,10 +732,10 @@
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+      "integrity": "sha1-UWbihkV/AzBgZL5Ul+jbsMPTIIM=",
       "dev": true,
       "requires": {
-        "brace-expansion": "1.1.8"
+        "brace-expansion": "^1.1.7"
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+          "integrity": "sha1-wZyd+aAocC1nhhI4SmVSQExjbRU=",
           "dev": true,
           "requires": {
-            "fs.realpath": "1.0.0",
-            "inflight": "1.0.6",
-            "inherits": "2.0.3",
-            "minimatch": "3.0.4",
-            "once": "1.4.0",
-            "path-is-absolute": "1.0.1"
+            "fs.realpath": "^1.0.0",
+            "inflight": "^1.0.4",
+            "inherits": "2",
+            "minimatch": "^3.0.4",
+            "once": "^1.3.0",
+            "path-is-absolute": "^1.0.0"
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@@ -792,7 +802,7 @@
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           "dev": true,
           "requires": {
-            "has-flag": "2.0.0"
+            "has-flag": "^2.0.0"
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@@ -812,11 +822,11 @@
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-      "integrity": "sha512-NhZ4CsKx7cYm2vSrBAr2PvFOe6sWDf0UYLRqA6svUYg7+/TSfVAu49jYC4BvQ4Sms9SZgdqGBgroqfDhJdTyKQ==",
+      "integrity": "sha1-mA9vcthSEaU0fGsrwYxbhMPrR+8=",
       "dev": true,
       "requires": {
-        "encoding": "0.1.12",
-        "is-stream": "1.1.0"
+        "encoding": "^0.1.11",
+        "is-stream": "^1.0.1"
       }
     },
     "nopt": {
@@ -825,7 +835,7 @@
       "integrity": "sha1-xkZdvwirzU2zWTF/eaxopkayj/k=",
       "dev": true,
       "requires": {
-        "abbrev": "1.0.9"
+        "abbrev": "1"
       }
     },
     "ntypescript": {
@@ -846,7 +856,7 @@
       "integrity": "sha1-WDsap3WWHUsROsF9nFC6753Xa9E=",
       "dev": true,
       "requires": {
-        "wrappy": "1.0.2"
+        "wrappy": "1"
       }
     },
     "optimist": {
@@ -855,8 +865,8 @@
       "integrity": "sha1-2j6nRob6IaGaERwybpDrFaAZZoY=",
       "dev": true,
       "requires": {
-        "minimist": "0.0.10",
-        "wordwrap": "0.0.3"
+        "minimist": "~0.0.1",
+        "wordwrap": "~0.0.2"
       },
       "dependencies": {
         "minimist": {
@@ -879,12 +889,12 @@
       "integrity": "sha1-NkxeQJ0/TWMB1sC0wFu6UBgK62Q=",
       "dev": true,
       "requires": {
-        "deep-is": "0.1.3",
-        "fast-levenshtein": "2.0.6",
-        "levn": "0.3.0",
-        "prelude-ls": "1.1.2",
-        "type-check": "0.3.2",
-        "wordwrap": "1.0.0"
+        "deep-is": "~0.1.3",
+        "fast-levenshtein": "~2.0.4",
+        "levn": "~0.3.0",
+        "prelude-ls": "~1.1.2",
+        "type-check": "~0.3.2",
+        "wordwrap": "~1.0.0"
       }
     },
     "path-is-absolute": {
@@ -914,10 +924,10 @@
     "promise": {
       "version": "7.3.1",
       "resolved": "https://registry.npmjs.org/promise/-/promise-7.3.1.tgz",
-      "integrity": "sha512-nolQXZ/4L+bP/UGlkfaIujX9BKxGwmQ9OT4mOt5yvy8iK1h3wqTEJCijzGANTCCl9nWjY41juyAn2K3Q1hLLTg==",
+      "integrity": "sha1-BktyYCsY+Q8pGSuLG8QY/9Hr078=",
       "dev": true,
       "requires": {
-        "asap": "2.0.6"
+        "asap": "~2.0.3"
       }
     },
     "prop-types": {
@@ -926,9 +936,9 @@
       "integrity": "sha1-zq8IMCL8RrSjX2nhPvda7Q1jmFY=",
       "dev": true,
       "requires": {
-        "fbjs": "0.8.16",
-        "loose-envify": "1.3.1",
-        "object-assign": "4.1.1"
+        "fbjs": "^0.8.16",
+        "loose-envify": "^1.3.1",
+        "object-assign": "^4.1.1"
       }
     },
     "proxyquire": {
@@ -937,9 +947,9 @@
       "integrity": "sha512-TO9TAIz0mpa+SKddXsgCFatoe/KmHvoNVj2jDMC1kXE6kKn7/4CRpxvQ+0wAK9sbMT2FVO89qItlvnZMcFbJ2Q==",
       "dev": true,
       "requires": {
-        "fill-keys": "1.0.2",
-        "module-not-found-error": "1.0.1",
-        "resolve": "1.1.7"
+        "fill-keys": "^1.0.2",
+        "module-not-found-error": "^1.0.0",
+        "resolve": "~1.1.7"
       }
     },
     "react": {
@@ -948,10 +958,10 @@
       "integrity": "sha512-ZmIomM7EE1DvPEnSFAHZn9Vs9zJl5A9H7el0EGTE6ZbW9FKe/14IYAlPbC8iH25YarEQxZL+E8VW7Mi7kfQrDQ==",
       "dev": true,
       "requires": {
-        "fbjs": "0.8.16",
-        "loose-envify": "1.3.1",
-        "object-assign": "4.1.1",
-        "prop-types": "15.6.0"
+        "fbjs": "^0.8.16",
+        "loose-envify": "^1.1.0",
+        "object-assign": "^4.1.1",
+        "prop-types": "^15.6.0"
       }
     },
     "repeat-string": {
@@ -973,30 +983,30 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "align-text": "0.1.4"
+        "align-text": "^0.1.1"
       }
     },
     "rimraf": {
       "version": "2.6.2",
       "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-2.6.2.tgz",
-      "integrity": "sha512-lreewLK/BlghmxtfH36YYVg1i8IAce4TI7oao75I1g245+6BctqTVQiBP3YUJ9C6DQOXJmkYR9X9fCLtCOJc5w==",
+      "integrity": "sha1-LtgVDSShbqhlHm1u8PR8QVjOejY=",
       "dev": true,
       "requires": {
-        "glob": "7.1.2"
+        "glob": "^7.0.5"
       },
       "dependencies": {
         "glob": {
           "version": "7.1.2",
           "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.2.tgz",
-          "integrity": "sha512-MJTUg1kjuLeQCJ+ccE4Vpa6kKVXkPYJ2mOCQyUuKLcLQsdrMCpBPUi8qVE6+YuaJkozeA9NusTAw3hLr8Xe5EQ==",
+          "integrity": "sha1-wZyd+aAocC1nhhI4SmVSQExjbRU=",
           "dev": true,
           "requires": {
-            "fs.realpath": "1.0.0",
-            "inflight": "1.0.6",
-            "inherits": "2.0.3",
-            "minimatch": "3.0.4",
-            "once": "1.4.0",
-            "path-is-absolute": "1.0.1"
+            "fs.realpath": "^1.0.0",
+            "inflight": "^1.0.4",
+            "inherits": "2",
+            "minimatch": "^3.0.4",
+            "once": "^1.3.0",
+            "path-is-absolute": "^1.0.0"
           }
         }
       }
@@ -1016,15 +1026,15 @@
     "source-map": {
       "version": "0.6.1",
       "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
-      "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g=="
+      "integrity": "sha1-dHIq8y6WFOnCh6jQu95IteLxomM="
     },
     "source-map-support": {
       "version": "0.5.6",
       "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.5.6.tgz",
-      "integrity": "sha512-N4KXEz7jcKqPf2b2vZF11lQIz9W5ZMuUcIOGj243lduidkf2fjkVKJS9vNxVWn3u/uxX38AcE8U9nnH9FPcq+g==",
+      "integrity": "sha1-RDXO5Gsaq2K46GEM5g94gJHFHBM=",
       "requires": {
-        "buffer-from": "1.0.0",
-        "source-map": "0.6.1"
+        "buffer-from": "^1.0.0",
+        "source-map": "^0.6.0"
       }
     },
     "sprintf-js": {
@@ -1039,7 +1049,7 @@
       "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
       "dev": true,
       "requires": {
-        "ansi-regex": "2.1.1"
+        "ansi-regex": "^2.0.0"
       }
     },
     "supports-color": {
@@ -1048,7 +1058,7 @@
       "integrity": "sha1-vnoN5ITexcXN34s9WRJQRJEvY1s=",
       "dev": true,
       "requires": {
-        "has-flag": "2.0.0"
+        "has-flag": "^2.0.0"
       }
     },
     "tslib": {
@@ -1063,31 +1073,31 @@
       "integrity": "sha1-H0mtWy53x2w69N3K5VKuTjYS6xM=",
       "dev": true,
       "requires": {
-        "babel-code-frame": "6.26.0",
-        "builtin-modules": "1.1.1",
-        "chalk": "2.3.0",
-        "commander": "2.11.0",
-        "diff": "3.4.0",
-        "glob": "7.1.2",
-        "minimatch": "3.0.4",
-        "resolve": "1.5.0",
-        "semver": "5.4.1",
-        "tslib": "1.8.1",
-        "tsutils": "2.14.0"
+        "babel-code-frame": "^6.22.0",
+        "builtin-modules": "^1.1.1",
+        "chalk": "^2.1.0",
+        "commander": "^2.9.0",
+        "diff": "^3.2.0",
+        "glob": "^7.1.1",
+        "minimatch": "^3.0.4",
+        "resolve": "^1.3.2",
+        "semver": "^5.3.0",
+        "tslib": "^1.7.1",
+        "tsutils": "^2.12.1"
       },
       "dependencies": {
         "glob": {
           "version": "7.1.2",
           "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.2.tgz",
-          "integrity": "sha512-MJTUg1kjuLeQCJ+ccE4Vpa6kKVXkPYJ2mOCQyUuKLcLQsdrMCpBPUi8qVE6+YuaJkozeA9NusTAw3hLr8Xe5EQ==",
+          "integrity": "sha1-wZyd+aAocC1nhhI4SmVSQExjbRU=",
           "dev": true,
           "requires": {
-            "fs.realpath": "1.0.0",
-            "inflight": "1.0.6",
-            "inherits": "2.0.3",
-            "minimatch": "3.0.4",
-            "once": "1.4.0",
-            "path-is-absolute": "1.0.1"
+            "fs.realpath": "^1.0.0",
+            "inflight": "^1.0.4",
+            "inherits": "2",
+            "minimatch": "^3.0.4",
+            "once": "^1.3.0",
+            "path-is-absolute": "^1.0.0"
           }
         },
         "resolve": {
@@ -1096,7 +1106,7 @@
           "integrity": "sha512-hgoSGrc3pjzAPHNBg+KnFcK2HwlHTs/YrAGUr6qgTVUZmXv1UEXXl0bZNBKMA9fud6lRYFdPGz0xXxycPzmmiw==",
           "dev": true,
           "requires": {
-            "path-parse": "1.0.5"
+            "path-parse": "^1.0.5"
           }
         }
       }
@@ -1104,10 +1114,10 @@
     "tslint-config-standard": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/tslint-config-standard/-/tslint-config-standard-7.0.0.tgz",
-      "integrity": "sha512-QCrLt8WwiRgZpRSgRsk6cExy8/Vipa/5fHespm4Q1ly90EB6Lni04Ub8dkEW10bV3fPN3SkxEwj41ZOe/knCZA==",
+      "integrity": "sha1-R7vyVXjtIhJFb4ktUeGr6ISinxU=",
       "dev": true,
       "requires": {
-        "tslint-eslint-rules": "4.1.1"
+        "tslint-eslint-rules": "^4.1.1"
       }
     },
     "tslint-eslint-rules": {
@@ -1116,9 +1126,9 @@
       "integrity": "sha1-fDDniC8mvCdr/5HSOEl1xp2viLo=",
       "dev": true,
       "requires": {
-        "doctrine": "0.7.2",
-        "tslib": "1.8.1",
-        "tsutils": "1.9.1"
+        "doctrine": "^0.7.2",
+        "tslib": "^1.0.0",
+        "tsutils": "^1.4.0"
       },
       "dependencies": {
         "tsutils": {
@@ -1135,7 +1145,7 @@
       "integrity": "sha512-f6axSMV0RoUufiKiRQgmRlN1c+Ag+mDaZjcd6bHdvplT/zyhuMCGqw3pJS8s3+0x4EVkdoQajs9PchdDZlguvw==",
       "dev": true,
       "requires": {
-        "tslib": "1.8.1"
+        "tslib": "^1.8.0"
       }
     },
     "type-check": {
@@ -1144,7 +1154,7 @@
       "integrity": "sha1-WITKtRLPHTVeP7eE8wgEsrUg23I=",
       "dev": true,
       "requires": {
-        "prelude-ls": "1.1.2"
+        "prelude-ls": "~1.1.2"
       }
     },
     "type-detect": {
@@ -1172,9 +1182,9 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "source-map": "0.5.7",
-        "uglify-to-browserify": "1.0.2",
-        "yargs": "3.10.0"
+        "source-map": "~0.5.1",
+        "uglify-to-browserify": "~1.0.0",
+        "yargs": "~3.10.0"
       },
       "dependencies": {
         "source-map": {
@@ -1205,7 +1215,7 @@
       "integrity": "sha512-xcJpopdamTuY5duC/KnTTNBraPK54YwpenP4lzxU8H91GudWpFv38u0CKjclE1Wi2EH2EDz5LRcHcKbCIzqGyg==",
       "dev": true,
       "requires": {
-        "isexe": "2.0.0"
+        "isexe": "^2.0.0"
       }
     },
     "window-size": {
@@ -1234,9 +1244,9 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "camelcase": "1.2.1",
-        "cliui": "2.1.0",
-        "decamelize": "1.2.0",
+        "camelcase": "^1.0.2",
+        "cliui": "^2.1.0",
+        "decamelize": "^1.0.0",
         "window-size": "0.1.0"
       }
     },
diff --git a/package.json b/package.json
index c7b9d58a7..4dd4f1be2 100644
--- a/package.json
+++ b/package.json
@@ -49,6 +49,7 @@
   "homepage": "https://github.com/TypeStrong/ts-node",
   "devDependencies": {
     "@types/arrify": "^1.0.1",
+    "@types/buffer-from": "^1.1.0",
     "@types/chai": "^4.0.4",
     "@types/diff": "^3.2.1",
     "@types/minimist": "^1.2.0",
@@ -74,6 +75,7 @@
   },
   "dependencies": {
     "arrify": "^1.0.0",
+    "buffer-from": "^1.1.0",
     "diff": "^3.1.0",
     "make-error": "^1.1.1",
     "minimist": "^1.2.0",
diff --git a/src/index.ts b/src/index.ts
index 225ed24bf..8041627eb 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -6,6 +6,7 @@ import mkdirp = require('mkdirp')
 import crypto = require('crypto')
 import yn = require('yn')
 import arrify = require('arrify')
+import bufferFrom = require('buffer-from')
 import { BaseError } from 'make-error'
 import * as util from 'util'
 import * as _ts from 'typescript'
@@ -557,7 +558,7 @@ function readThrough (
  * Update the output remapping the source map.
  */
 function updateOutput (outputText: string, fileName: string, sourceMap: string, getExtension: (fileName: string) => string) {
-  const base64Map = Buffer.from(updateSourceMap(sourceMap, fileName), 'utf8').toString('base64')
+  const base64Map = bufferFrom(updateSourceMap(sourceMap, fileName), 'utf8').toString('base64')
   const sourceMapContent = `data:application/json;charset=utf-8;base64,${base64Map}`
   const sourceMapLength = `${basename(fileName)}.map`.length + (getExtension(fileName).length - extname(fileName).length)