diff --git a/lib/index.ts b/lib/index.ts
index 6cbb9cb..f6fa8df 100644
--- a/lib/index.ts
+++ b/lib/index.ts
@@ -613,7 +613,7 @@ export function bundle(options: Options): BundleResult {
             file = path.join(file, 'index.d.ts');
         }
         const code = fs.readFileSync(file, { encoding: 'utf8' }).replace(bomOptExp, '').replace(/\s*$/, '');
-        res.indent = detectIndent(code) || indent;
+        res.indent = (detectIndent(code) || indent) as string;
 
         // buffer multi-line comments, handle JSDoc
         let multiComment: string[] = [];
diff --git a/package-lock.json b/package-lock.json
index 873da20..400f993 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,15 +4,24 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "@types/color-name": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/@types/color-name/-/color-name-1.1.1.tgz",
+      "integrity": "sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ==",
+      "dev": true
+    },
     "@types/detect-indent": {
-      "version": "0.1.30",
-      "resolved": "https://registry.npmjs.org/@types/detect-indent/-/detect-indent-0.1.30.tgz",
-      "integrity": "sha1-3GgrtBK05lugmOcO2tc7SDP7kQ0="
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/@types/detect-indent/-/detect-indent-6.0.0.tgz",
+      "integrity": "sha512-KeE9HzRWAoOy/YPEMzNbljqTmDR7JXCD8NpOwSjta9oWoL8+i9E2KzwUX0nb1b78iB481RSJ5XIxHfjaJnUtvA==",
+      "requires": {
+        "detect-indent": "*"
+      }
     },
     "@types/glob": {
-      "version": "5.0.30",
-      "resolved": "https://registry.npmjs.org/@types/glob/-/glob-5.0.30.tgz",
-      "integrity": "sha1-ECZAnFYlqGiQdGAoCNCCsoZ7ilE=",
+      "version": "7.1.3",
+      "resolved": "https://registry.npmjs.org/@types/glob/-/glob-7.1.3.tgz",
+      "integrity": "sha512-SEYeGAIQIQX8NN6LDKprLjbrd5dARM5EXsd8GI/A5l0apYI1fGMWgPHSe4ZKL4eozlAyI+doUE9XbYS4xCkQ1w==",
       "requires": {
         "@types/minimatch": "*",
         "@types/node": "*"
@@ -24,14 +33,17 @@
       "integrity": "sha512-tHq6qdbT9U1IRSGf14CL0pUlULksvY9OZ+5eEgl1N7t+OA3tGvNpxJCzuKQlsNgCVwbAs670L1vcVQi8j9HjnA=="
     },
     "@types/mkdirp": {
-      "version": "0.3.29",
-      "resolved": "https://registry.npmjs.org/@types/mkdirp/-/mkdirp-0.3.29.tgz",
-      "integrity": "sha1-fyrX7FX5FEgvybHsS7GuYCjUYGY="
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/@types/mkdirp/-/mkdirp-1.0.1.tgz",
+      "integrity": "sha512-HkGSK7CGAXncr8Qn/0VqNtExEE+PHMWb+qlR1faHMao7ng6P3tAaoWWBMdva0gL5h4zprjIO89GJOLXsMcDm1Q==",
+      "requires": {
+        "@types/node": "*"
+      }
     },
     "@types/node": {
-      "version": "8.0.0",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-8.0.0.tgz",
-      "integrity": "sha512-j2tekvJCO7j22cs+LO6i0kRPhmQ9MXaPZ55TzOc1lzkN5b6BWqq4AFjl04s1oRRQ1v5rSe+KEvnLUSTonuls/A=="
+      "version": "14.11.2",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-14.11.2.tgz",
+      "integrity": "sha512-jiE3QIxJ8JLNcb1Ps6rDbysDhN4xa8DJJvuC9prr6w+1tIh+QAbYyNF3tyiZNLDBIuBCf4KEcV2UvQm/V60xfA=="
     },
     "abbrev": {
       "version": "1.1.1",
@@ -135,10 +147,26 @@
       "integrity": "sha1-45sJrqne+Gao8gbiiK9jkZuuOcQ=",
       "dev": true
     },
-    "array-find-index": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/array-find-index/-/array-find-index-1.0.2.tgz",
-      "integrity": "sha1-3wEKoSh+Fku9pvlyOwqWoexBh6E=",
+    "array-each": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/array-each/-/array-each-1.0.1.tgz",
+      "integrity": "sha1-p5SvDAWrF1KEbudTofIRoFugxE8=",
+      "dev": true
+    },
+    "array-events": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/array-events/-/array-events-0.2.0.tgz",
+      "integrity": "sha1-/0KsU+ZvSF1viDI0wyJSvCKGEw4=",
+      "dev": true,
+      "requires": {
+        "async-arrays": "*",
+        "extended-emitter": "*"
+      }
+    },
+    "array-slice": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/array-slice/-/array-slice-1.1.0.tgz",
+      "integrity": "sha512-B1qMD3RBP7O8o0H2KbrXDyB0IccejMF15+87Lvlor12ONPRHP6gTjXMNkt/d3ZuOGbAe66hFmaCfECI24Ufp6w==",
       "dev": true
     },
     "array-unique": {
@@ -163,9 +191,9 @@
       "dev": true
     },
     "assertion-error": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-1.0.0.tgz",
-      "integrity": "sha1-x/hUOP3UZrx8oWq5DIFRN5el0js=",
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-1.1.0.tgz",
+      "integrity": "sha512-jgsaNduz+ndvGyFt3uSuWqvy4lCnIJiovtouQN5JZHOKCS2QuhEdbcQHFhVksz2N2U9hXJo8odG7ETyWlEeuDw==",
       "dev": true
     },
     "assign-symbols": {
@@ -180,6 +208,15 @@
       "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
       "dev": true
     },
+    "async-arrays": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/async-arrays/-/async-arrays-1.0.1.tgz",
+      "integrity": "sha1-NHrytw8qeldnotVnnMQrvxwiD9k=",
+      "dev": true,
+      "requires": {
+        "sift": "*"
+      }
+    },
     "async-each": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/async-each/-/async-each-1.0.3.tgz",
@@ -296,12 +333,12 @@
       }
     },
     "bit-mask": {
-      "version": "0.0.2-alpha",
-      "resolved": "https://registry.npmjs.org/bit-mask/-/bit-mask-0.0.2-alpha.tgz",
-      "integrity": "sha1-QogPqABVFRFl1foVszG8BFnCc3I=",
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/bit-mask/-/bit-mask-1.0.2.tgz",
+      "integrity": "sha512-UGtq08LSiazxL4zVmBzrhdCWnT4RWx3JhhD/3crhfv8xxjnVHxf/WoVjEstjSUaZeZRP7kZrWNqup1VvUClCaQ==",
       "dev": true,
       "requires": {
-        "prime": "0.0.5-alpha"
+        "array-events": "^0.2.0"
       }
     },
     "boxen": {
@@ -379,22 +416,12 @@
         "unset-value": "^1.0.0"
       }
     },
-    "camelcase": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-2.1.1.tgz",
-      "integrity": "sha1-fB0W1nmhu+WcoCys7PsBHiAfWh8=",
+    "call-me-maybe": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/call-me-maybe/-/call-me-maybe-1.0.1.tgz",
+      "integrity": "sha1-JtII6onje1y95gJQoV8DHBak1ms=",
       "dev": true
     },
-    "camelcase-keys": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/camelcase-keys/-/camelcase-keys-2.1.0.tgz",
-      "integrity": "sha1-MIvur/3ygRkFHvodkyITyRuPkuc=",
-      "dev": true,
-      "requires": {
-        "camelcase": "^2.0.0",
-        "map-obj": "^1.0.0"
-      }
-    },
     "capture-stack-trace": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/capture-stack-trace/-/capture-stack-trace-1.0.1.tgz",
@@ -408,22 +435,27 @@
       "dev": true
     },
     "chai": {
-      "version": "1.10.0",
-      "resolved": "https://registry.npmjs.org/chai/-/chai-1.10.0.tgz",
-      "integrity": "sha1-5AMcyHZURhp1lD5aNatG6vOcHrk=",
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/chai/-/chai-4.2.0.tgz",
+      "integrity": "sha512-XQU3bhBukrOsQCuwZndwGcCVQHyZi53fQ6Ys1Fym7E4olpIqqZZhhoFJoaKVvV17lWQoXYwgWN2nF5crA8J2jw==",
       "dev": true,
       "requires": {
-        "assertion-error": "1.0.0",
-        "deep-eql": "0.1.3"
+        "assertion-error": "^1.1.0",
+        "check-error": "^1.0.2",
+        "deep-eql": "^3.0.1",
+        "get-func-name": "^2.0.0",
+        "pathval": "^1.1.0",
+        "type-detect": "^4.0.5"
       }
     },
     "chai-fs": {
-      "version": "0.1.0",
-      "resolved": "https://registry.npmjs.org/chai-fs/-/chai-fs-0.1.0.tgz",
-      "integrity": "sha1-7ji7SkZ1SZJvSIK/V/DF6jRaCYA=",
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/chai-fs/-/chai-fs-2.0.0.tgz",
+      "integrity": "sha1-Na4Dn7uwcQ9RIqrhf6uh6PQRB8Y=",
       "dev": true,
       "requires": {
-        "bit-mask": "0.0.2-alpha"
+        "bit-mask": "^1.0.1",
+        "readdir-enhanced": "^1.4.0"
       }
     },
     "chalk": {
@@ -439,6 +471,12 @@
         "supports-color": "^2.0.0"
       }
     },
+    "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": "2.1.8",
       "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-2.1.8.tgz",
@@ -574,12 +612,6 @@
       "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
       "dev": true
     },
-    "coffee-script": {
-      "version": "1.10.0",
-      "resolved": "https://registry.npmjs.org/coffee-script/-/coffee-script-1.10.0.tgz",
-      "integrity": "sha1-EpOLz5vhlI+gBvkuDEyegXBRCMA=",
-      "dev": true
-    },
     "collection-visit": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/collection-visit/-/collection-visit-1.0.0.tgz",
@@ -621,9 +653,9 @@
       }
     },
     "commander": {
-      "version": "2.20.3",
-      "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.3.tgz",
-      "integrity": "sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ=="
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-5.1.0.tgz",
+      "integrity": "sha512-P0CysNDQ7rtVw4QIQtm+MRxV66vKFSvlsQvGYXZWR3qFU0jlMKHZZZgw8e+8DSah4UDKMqnknRDQz+xuQXQ/Zg=="
     },
     "commandpost": {
       "version": "1.0.0",
@@ -656,6 +688,17 @@
         "uuid": "^2.0.1",
         "write-file-atomic": "^1.1.2",
         "xdg-basedir": "^2.0.0"
+      },
+      "dependencies": {
+        "mkdirp": {
+          "version": "0.5.5",
+          "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.5.tgz",
+          "integrity": "sha512-NKmAlESf6jMGym1++R0Ra7wvhV+wFW63FaSOFPwRahvea0gMUcGUhVeAg/0BC0wiv9ih5NYPB1Wn1UEI1/L+xQ==",
+          "dev": true,
+          "requires": {
+            "minimist": "^1.2.5"
+          }
+        }
       }
     },
     "console-browserify": {
@@ -708,15 +751,6 @@
         }
       }
     },
-    "currently-unhandled": {
-      "version": "0.4.1",
-      "resolved": "https://registry.npmjs.org/currently-unhandled/-/currently-unhandled-0.4.1.tgz",
-      "integrity": "sha1-mI3zP+qxke95mmE2nddsF635V+o=",
-      "dev": true,
-      "requires": {
-        "array-find-index": "^1.0.1"
-      }
-    },
     "dashdash": {
       "version": "1.14.1",
       "resolved": "https://registry.npmjs.org/dashdash/-/dashdash-1.14.1.tgz",
@@ -733,14 +767,10 @@
       "dev": true
     },
     "dateformat": {
-      "version": "1.0.12",
-      "resolved": "https://registry.npmjs.org/dateformat/-/dateformat-1.0.12.tgz",
-      "integrity": "sha1-nxJLZ1lMk3/3BpMuSmQsyo27/uk=",
-      "dev": true,
-      "requires": {
-        "get-stdin": "^4.0.1",
-        "meow": "^3.3.0"
-      }
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/dateformat/-/dateformat-3.0.3.tgz",
+      "integrity": "sha512-jyCETtSl3VMZMWeRo7iY1FL19ges1t55hMo5yaam4Jrsm5EPL89UQkoQRyiI+Yf4k8r2ZpdngkV8hr1lIdjb3Q==",
+      "dev": true
     },
     "debug": {
       "version": "2.6.9",
@@ -764,12 +794,12 @@
       "dev": true
     },
     "deep-eql": {
-      "version": "0.1.3",
-      "resolved": "https://registry.npmjs.org/deep-eql/-/deep-eql-0.1.3.tgz",
-      "integrity": "sha1-71WKyrjeJSBs1xOQbXTlaTDrafI=",
+      "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": "0.1.1"
+        "type-detect": "^4.0.0"
       }
     },
     "deep-extend": {
@@ -834,26 +864,16 @@
       "integrity": "sha1-3zrhmayt+31ECqrgsp4icrJOxhk=",
       "dev": true
     },
+    "detect-file": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/detect-file/-/detect-file-1.0.0.tgz",
+      "integrity": "sha1-8NZtA2cqglyxtzvbP+YjEMjlUrc=",
+      "dev": true
+    },
     "detect-indent": {
-      "version": "0.2.0",
-      "resolved": "https://registry.npmjs.org/detect-indent/-/detect-indent-0.2.0.tgz",
-      "integrity": "sha1-BCkUSYl5rC2fPHPk/z5od9O8krY=",
-      "requires": {
-        "get-stdin": "^0.1.0",
-        "minimist": "^0.1.0"
-      },
-      "dependencies": {
-        "get-stdin": {
-          "version": "0.1.0",
-          "resolved": "https://registry.npmjs.org/get-stdin/-/get-stdin-0.1.0.tgz",
-          "integrity": "sha1-WZivJKr8gC0VyCxoVlfuuLENSpE="
-        },
-        "minimist": {
-          "version": "0.1.0",
-          "resolved": "https://registry.npmjs.org/minimist/-/minimist-0.1.0.tgz",
-          "integrity": "sha1-md9lelJXTCHJBXSX33QnkLK0wN4="
-        }
-      }
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/detect-indent/-/detect-indent-6.0.0.tgz",
+      "integrity": "sha512-oSyFlqaTHCItVRGK5RmrmjB+CmaMOW7IaNA/kdxqhoa6d17j/5ce9O9eWXmV/KEdRwqpQA+Vqe8a8Bsybu4YnA=="
     },
     "detect-newline": {
       "version": "2.1.0",
@@ -1126,9 +1146,9 @@
       "dev": true
     },
     "esprima": {
-      "version": "2.7.3",
-      "resolved": "https://registry.npmjs.org/esprima/-/esprima-2.7.3.tgz",
-      "integrity": "sha1-luO3DVd59q1JzQMmc9HDEnZ7pYE=",
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/esprima/-/esprima-4.0.1.tgz",
+      "integrity": "sha512-eGuFFw7Upda+g4p+QHvnW0RyTX/SVeJBDM/gCtMARO0cLuT2HcEKnTPvhjV6aGeqrCB/sbNop0Kszm0jsaWU4A==",
       "dev": true
     },
     "eventemitter2": {
@@ -1184,6 +1204,15 @@
         }
       }
     },
+    "expand-tilde": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/expand-tilde/-/expand-tilde-2.0.2.tgz",
+      "integrity": "sha1-l+gBqgUt8CRU3kawK/YhZCzchQI=",
+      "dev": true,
+      "requires": {
+        "homedir-polyfill": "^1.0.1"
+      }
+    },
     "extend": {
       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/extend/-/extend-3.0.2.tgz",
@@ -1211,6 +1240,16 @@
         }
       }
     },
+    "extended-emitter": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/extended-emitter/-/extended-emitter-1.0.4.tgz",
+      "integrity": "sha512-QBGuIo+pCXnYNeLUObaH/IKrCrzWzm4KhQNvA/mwNTs7/wzFylmA765zxh0WwWqpX1skQGXvzcRMHScc87Om/g==",
+      "dev": true,
+      "requires": {
+        "sift": "*",
+        "wolfy87-eventemitter": "*"
+      }
+    },
     "extglob": {
       "version": "2.0.4",
       "resolved": "https://registry.npmjs.org/extglob/-/extglob-2.0.4.tgz",
@@ -1340,16 +1379,6 @@
       "integrity": "sha1-w8T2xmO5I0WamqKZEtLQMfFQf4Q=",
       "dev": true
     },
-    "find-up": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/find-up/-/find-up-1.1.2.tgz",
-      "integrity": "sha1-ay6YIrGizgpgq2TWEOzK1TyyTQ8=",
-      "dev": true,
-      "requires": {
-        "path-exists": "^2.0.0",
-        "pinkie-promise": "^2.0.0"
-      }
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       "version": "0.3.0",
       "resolved": "https://registry.npmjs.org/findup-sync/-/findup-sync-0.3.0.tgz",
@@ -1374,6 +1403,25 @@
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       }
     },
+    "fined": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/fined/-/fined-1.2.0.tgz",
+      "integrity": "sha512-ZYDqPLGxDkDhDZBjZBb+oD1+j0rA4E0pXY50eplAAOPg2N/gUBSSk5IM1/QhPfyVo19lJ+CvXpqfvk+b2p/8Ng==",
+      "dev": true,
+      "requires": {
+        "expand-tilde": "^2.0.2",
+        "is-plain-object": "^2.0.3",
+        "object.defaults": "^1.1.0",
+        "object.pick": "^1.2.0",
+        "parse-filepath": "^1.0.1"
+      }
+    },
+    "flagged-respawn": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/flagged-respawn/-/flagged-respawn-1.0.1.tgz",
+      "integrity": "sha512-lNaHNVymajmk0OJMBn8fVUAU1BtDeKIqKoVhk4xAALB57aALg6b4W0MfJ/cUE0g9YBXy5XhSlPIpYIJ7HaY/3Q==",
+      "dev": true
+    },
     "flat": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/flat/-/flat-4.1.0.tgz",
@@ -1397,6 +1445,15 @@
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       "dev": true
     },
+    "for-own": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/for-own/-/for-own-1.0.0.tgz",
+      "integrity": "sha1-xjMy9BXO3EsE2/5wz4NklMU8tEs=",
+      "dev": true,
+      "requires": {
+        "for-in": "^1.0.1"
+      }
+    },
     "forever-agent": {
       "version": "0.6.1",
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-    },
     "split-string": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/split-string/-/split-string-3.1.0.tgz",
@@ -4060,15 +4224,6 @@
         "is-utf8": "^0.2.0"
       }
     },
-    "strip-indent": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/strip-indent/-/strip-indent-1.0.1.tgz",
-      "integrity": "sha1-DHlipq3vp7vUrDZkYKY4VSrhoKI=",
-      "dev": true,
-      "requires": {
-        "get-stdin": "^4.0.1"
-      }
-    },
     "strip-json-comments": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-1.0.4.tgz",
@@ -4145,12 +4300,6 @@
         "punycode": "^2.1.1"
       }
     },
-    "trim-newlines": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/trim-newlines/-/trim-newlines-1.0.0.tgz",
-      "integrity": "sha1-WIeWa7WCpFA6QetST301ARgVphM=",
-      "dev": true
-    },
     "tunnel-agent": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
@@ -4167,23 +4316,33 @@
       "dev": true
     },
     "type-detect": {
-      "version": "0.1.1",
-      "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-0.1.1.tgz",
-      "integrity": "sha1-C6XsKohWQORw6k6FBZcZANrFiCI=",
+      "version": "4.0.8",
+      "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.8.tgz",
+      "integrity": "sha512-0fr/mIH1dlO+x7TlcMy+bIDqKPsw/70tVyeHW787goQjhmqaZe10uwLujubK9q9Lg6Fiho1KUKDYz0Z7k7g5/g==",
       "dev": true
     },
     "typescript": {
-      "version": "2.9.2",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-2.9.2.tgz",
-      "integrity": "sha512-Gr4p6nFNaoufRIY4NMdpQRNmgxVIGMs4Fcu/ujdYk3nAZqk7supzBE9idmvfZIlH/Cuj//dvi+019qEue9lV0w==",
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.0.3.tgz",
+      "integrity": "sha512-tEu6DGxGgRJPb/mVPIZ48e69xCn2yRmCgYmDugAVwmJ6o+0u1RI18eO7E7WBTLYLaEVVOhwQmcdhQHweux/WPg==",
       "dev": true
     },
-    "underscore.string": {
-      "version": "3.2.3",
-      "resolved": "https://registry.npmjs.org/underscore.string/-/underscore.string-3.2.3.tgz",
-      "integrity": "sha1-gGmSYzZl1eX8tNsfs6hi62jp5to=",
+    "unc-path-regex": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/unc-path-regex/-/unc-path-regex-0.1.2.tgz",
+      "integrity": "sha1-5z3T17DXxe2G+6xrCufYxqadUPo=",
       "dev": true
     },
+    "underscore.string": {
+      "version": "3.3.5",
+      "resolved": "https://registry.npmjs.org/underscore.string/-/underscore.string-3.3.5.tgz",
+      "integrity": "sha512-g+dpmgn+XBneLmXXo+sGlW5xQEt4ErkS3mgeN2GFbremYeMBSJKr9Wf2KJplQVaiPY/f7FN6atosWYNm9ovrYg==",
+      "dev": true,
+      "requires": {
+        "sprintf-js": "^1.0.3",
+        "util-deprecate": "^1.0.2"
+      }
+    },
     "unfunk-diff": {
       "version": "0.0.2",
       "resolved": "https://registry.npmjs.org/unfunk-diff/-/unfunk-diff-0.0.2.tgz",
@@ -4294,6 +4453,17 @@
             "uuid": "^2.0.1",
             "write-file-atomic": "^1.1.2",
             "xdg-basedir": "^2.0.0"
+          },
+          "dependencies": {
+            "mkdirp": {
+              "version": "0.5.5",
+              "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.5.tgz",
+              "integrity": "sha512-NKmAlESf6jMGym1++R0Ra7wvhV+wFW63FaSOFPwRahvea0gMUcGUhVeAg/0BC0wiv9ih5NYPB1Wn1UEI1/L+xQ==",
+              "dev": true,
+              "requires": {
+                "minimist": "^1.2.5"
+              }
+            }
           }
         }
       }
@@ -4340,14 +4510,13 @@
       "integrity": "sha1-Z+LoY3lyFVMN/zGOW/nc6/1Hsho=",
       "dev": true
     },
-    "validate-npm-package-license": {
-      "version": "3.0.4",
-      "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
-      "integrity": "sha512-DpKm2Ui/xN7/HQKCtpZxoRWBhZ9Z0kqtygG8XCgNQ8ZlDnxuQmWhj566j8fN4Cu3/JmbhsDo7fcAJq4s9h27Ew==",
+    "v8flags": {
+      "version": "3.1.3",
+      "resolved": "https://registry.npmjs.org/v8flags/-/v8flags-3.1.3.tgz",
+      "integrity": "sha512-amh9CCg3ZxkzQ48Mhcb8iX7xpAfYJgePHxWMQCBWECpOSqJUXgY26ncA61UTV0BkPqfhcy6mzwCIoP4ygxpW8w==",
       "dev": true,
       "requires": {
-        "spdx-correct": "^3.0.0",
-        "spdx-expression-parse": "^3.0.0"
+        "homedir-polyfill": "^1.0.1"
       }
     },
     "verror": {
@@ -4362,9 +4531,9 @@
       }
     },
     "which": {
-      "version": "1.2.14",
-      "resolved": "https://registry.npmjs.org/which/-/which-1.2.14.tgz",
-      "integrity": "sha1-mofEN48D6CfOyvGs31bHNsAcFOU=",
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
+      "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
       "dev": true,
       "requires": {
         "isexe": "^2.0.0"
@@ -4403,6 +4572,12 @@
         "semver": "^5.0.1"
       }
     },
+    "wolfy87-eventemitter": {
+      "version": "5.2.9",
+      "resolved": "https://registry.npmjs.org/wolfy87-eventemitter/-/wolfy87-eventemitter-5.2.9.tgz",
+      "integrity": "sha512-P+6vtWyuDw+MB01X7UeF8TaHBvbCovf4HPEMF/SV7BdDc1SMTiBy13SRD71lQh4ExFTG1d/WNzDGDCyOKSMblw==",
+      "dev": true
+    },
     "wrap-ansi": {
       "version": "5.1.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-5.1.0.tgz",
diff --git a/package.json b/package.json
index 617b8e4..b5e5909 100644
--- a/package.json
+++ b/package.json
@@ -38,19 +38,19 @@
   },
   "main": "./index.js",
   "dependencies": {
-    "@types/detect-indent": "0.1.30",
-    "@types/glob": "5.0.30",
-    "@types/mkdirp": "0.3.29",
-    "@types/node": "8.0.0",
-    "commander": "^2.9.0",
-    "detect-indent": "^0.2.0",
-    "glob": "^6.0.4",
-    "mkdirp": "^0.5.0"
+    "@types/detect-indent": "6.0.0",
+    "@types/glob": "7.1.3",
+    "@types/mkdirp": "1.0.1",
+    "@types/node": "14.11.2",
+    "commander": "^5.1.0",
+    "detect-indent": "^6.0.0",
+    "glob": "^7.1.6",
+    "mkdirp": "^1.0.4"
   },
   "devDependencies": {
-    "chai": "^1.10.0",
-    "chai-fs": "0.1.0",
-    "grunt": "1.0.1",
+    "chai": "^4.2.0",
+    "chai-fs": "2.0.0",
+    "grunt": "1.3.0",
     "grunt-contrib-clean": "^2.0.0",
     "grunt-contrib-jshint": "^2.1.0",
     "grunt-dtsm": "1.0.0",
@@ -59,7 +59,7 @@
     "grunt-ts": "^6.0.0-beta.22",
     "jshint-path-reporter": "^0.1.3",
     "mocha-unfunk-reporter": "^0.4.0",
-    "ncp": "^0.5.1",
-    "typescript": "^2.3.4"
+    "ncp": "^2.0.0",
+    "typescript": "^4.0.3"
   }
 }
diff --git a/test/expected/default/foo-mx.d.ts b/test/expected/default/foo-mx.d.ts
index 3eddaee..9bd6b12 100644
--- a/test/expected/default/foo-mx.d.ts
+++ b/test/expected/default/foo-mx.d.ts
@@ -22,14 +22,15 @@ declare module 'foo-mx/lib/exported-sub' {
 
 declare module 'foo-mx/Foo' {
     class Foo {
-            foo: string;
-            constructor(secret?: string);
-            /**
-                * Bars the foo.
-                */
-            barFoo(): void;
-            /** Foos the baz. */
-            fooBaz(): void;
+        foo: string;
+        constructor(secret?: string);
+        /**
+          * Bars the foo.
+          */
+        barFoo(): void;
+        /** Foos the baz. */
+        fooBaz(): void;
     }
     export = Foo;
 }
+
diff --git a/test/expected/excludeExp/foo-mx.d.ts b/test/expected/excludeExp/foo-mx.d.ts
index 53fa0df..16c82c4 100644
--- a/test/expected/excludeExp/foo-mx.d.ts
+++ b/test/expected/excludeExp/foo-mx.d.ts
@@ -12,14 +12,15 @@ declare module 'foo-mx' {
 
 declare module 'foo-mx/Foo' {
     class Foo {
-            foo: string;
-            constructor(secret?: string);
-            /**
-                * Bars the foo.
-                */
-            barFoo(): void;
-            /** Foos the baz. */
-            fooBaz(): void;
+        foo: string;
+        constructor(secret?: string);
+        /**
+          * Bars the foo.
+          */
+        barFoo(): void;
+        /** Foos the baz. */
+        fooBaz(): void;
     }
     export = Foo;
 }
+
diff --git a/test/expected/excludeFunc/foo-mx.d.ts b/test/expected/excludeFunc/foo-mx.d.ts
index 53fa0df..16c82c4 100644
--- a/test/expected/excludeFunc/foo-mx.d.ts
+++ b/test/expected/excludeFunc/foo-mx.d.ts
@@ -12,14 +12,15 @@ declare module 'foo-mx' {
 
 declare module 'foo-mx/Foo' {
     class Foo {
-            foo: string;
-            constructor(secret?: string);
-            /**
-                * Bars the foo.
-                */
-            barFoo(): void;
-            /** Foos the baz. */
-            fooBaz(): void;
+        foo: string;
+        constructor(secret?: string);
+        /**
+          * Bars the foo.
+          */
+        barFoo(): void;
+        /** Foos the baz. */
+        fooBaz(): void;
     }
     export = Foo;
 }
+
diff --git a/test/expected/externals/foo-mx.d.ts b/test/expected/externals/foo-mx.d.ts
index d92b6b8..dea4212 100644
--- a/test/expected/externals/foo-mx.d.ts
+++ b/test/expected/externals/foo-mx.d.ts
@@ -32,14 +32,15 @@ declare module 'foo-mx/lib/exported-sub' {
 
 declare module 'foo-mx/Foo' {
     class Foo {
-            foo: string;
-            constructor(secret?: string);
-            /**
-                * Bars the foo.
-                */
-            barFoo(): void;
-            /** Foos the baz. */
-            fooBaz(): void;
+        foo: string;
+        constructor(secret?: string);
+        /**
+          * Bars the foo.
+          */
+        barFoo(): void;
+        /** Foos the baz. */
+        fooBaz(): void;
     }
     export = Foo;
 }
+
diff --git a/test/expected/includeExclude/foo-mx.d.ts b/test/expected/includeExclude/foo-mx.d.ts
index ba3848c..1aea54e 100644
--- a/test/expected/includeExclude/foo-mx.d.ts
+++ b/test/expected/includeExclude/foo-mx.d.ts
@@ -22,14 +22,15 @@ declare module 'foo-mx/index//external2' {
 
 declare module 'foo-mx/Foo' {
     class Foo {
-            foo: string;
-            constructor(secret?: string);
-            /**
-                * Bars the foo.
-                */
-            barFoo(): void;
-            /** Foos the baz. */
-            fooBaz(): void;
+        foo: string;
+        constructor(secret?: string);
+        /**
+          * Bars the foo.
+          */
+        barFoo(): void;
+        /** Foos the baz. */
+        fooBaz(): void;
     }
     export = Foo;
 }
+
diff --git a/test/expected/out/fizz/buzz.d.ts b/test/expected/out/fizz/buzz.d.ts
index 3eddaee..9bd6b12 100644
--- a/test/expected/out/fizz/buzz.d.ts
+++ b/test/expected/out/fizz/buzz.d.ts
@@ -22,14 +22,15 @@ declare module 'foo-mx/lib/exported-sub' {
 
 declare module 'foo-mx/Foo' {
     class Foo {
-            foo: string;
-            constructor(secret?: string);
-            /**
-                * Bars the foo.
-                */
-            barFoo(): void;
-            /** Foos the baz. */
-            fooBaz(): void;
+        foo: string;
+        constructor(secret?: string);
+        /**
+          * Bars the foo.
+          */
+        barFoo(): void;
+        /** Foos the baz. */
+        fooBaz(): void;
     }
     export = Foo;
 }
+
diff --git a/test/expected/remove/foo-mx.d.ts b/test/expected/remove/foo-mx.d.ts
index 3eddaee..9bd6b12 100644
--- a/test/expected/remove/foo-mx.d.ts
+++ b/test/expected/remove/foo-mx.d.ts
@@ -22,14 +22,15 @@ declare module 'foo-mx/lib/exported-sub' {
 
 declare module 'foo-mx/Foo' {
     class Foo {
-            foo: string;
-            constructor(secret?: string);
-            /**
-                * Bars the foo.
-                */
-            barFoo(): void;
-            /** Foos the baz. */
-            fooBaz(): void;
+        foo: string;
+        constructor(secret?: string);
+        /**
+          * Bars the foo.
+          */
+        barFoo(): void;
+        /** Foos the baz. */
+        fooBaz(): void;
     }
     export = Foo;
 }
+
diff --git a/test/expected/seprinnew/bar-mx.d.ts b/test/expected/seprinnew/bar-mx.d.ts
index 8a08b03..46005a2 100644
--- a/test/expected/seprinnew/bar-mx.d.ts
+++ b/test/expected/seprinnew/bar-mx.d.ts
@@ -14,7 +14,7 @@ declare module '--bar-mx#lib#exported-sub' { //$
 	import Foo = require('--bar-mx#Foo'); //$
 	import mod2 = require('external2'); //$
 	export class ExternalContainer { //$
-		something: mod2.AnotherType; //$
+	    something: mod2.AnotherType; //$
 	} //$
 	export function bar(foo: Foo): string; //$
 	export function bazz(value: string, option?: boolean): string; //$
@@ -22,14 +22,14 @@ declare module '--bar-mx#lib#exported-sub' { //$
  //$
 declare module '--bar-mx#Foo' { //$
 	class Foo { //$
-			foo: string; //$
-			constructor(secret?: string); //$
-			/** //$
-				* Bars the foo. //$
-				*/ //$
-			barFoo(): void; //$
-			/** Foos the baz. */ //$
-			fooBaz(): void; //$
+	    foo: string; //$
+	    constructor(secret?: string); //$
+	    /** //$
+	      * Bars the foo. //$
+	      */ //$
+	    barFoo(): void; //$
+	    /** Foos the baz. */ //$
+	    fooBaz(): void; //$
 	} //$
 	export = Foo; //$
 } //$
diff --git a/test/expected/transformModuleBody/foo-mx.d.ts b/test/expected/transformModuleBody/foo-mx.d.ts
index 1e03485..0e59cac 100644
--- a/test/expected/transformModuleBody/foo-mx.d.ts
+++ b/test/expected/transformModuleBody/foo-mx.d.ts
@@ -24,15 +24,16 @@ declare module 'foo-mx/lib/exported-sub' {
 
 declare module 'foo-mx/Foo' {
     class Foo {
-            foo: string;
-            constructor(secret?: string);
-            /**
-                * Bars the foo.
-                */
-            barFoo(): void;
-            /** Foos the baz. */
-            fooBaz(): void;
+        foo: string;
+        constructor(secret?: string);
+        /**
+          * Bars the foo.
+          */
+        barFoo(): void;
+        /** Foos the baz. */
+        fooBaz(): void;
     }
     export = Foo;
 /* INJECTED VIA transformModuleBody */
 }
+