diff --git a/package-lock.json b/package-lock.json
index 4a05584..634aa5d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,145 +1,183 @@
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       "dev": true,
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         "jsesc": "^2.5.1",
         "lodash": "^4.17.11",
         "source-map": "^0.5.0",
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+      },
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+      }
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       "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.4.4.tgz",
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         "@babel/parser": "^7.4.4",
         "@babel/types": "^7.4.4"
       }
     },
-    "@babel/traverse": {
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@@ -149,252 +187,300 @@
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         "globals": "^11.1.0",
         "lodash": "^4.17.11"
-      },
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       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
       "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
       "dev": true
     },
-    "uuid": {
+    "node_modules/uuid": {
       "version": "3.3.2",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz",
       "integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA==",
-      "dev": true
+      "deprecated": "Please upgrade  to version 7 or higher.  Older versions may use Math.random() in certain circumstances, which is known to be problematic.  See https://v8.dev/blog/math-random for details.",
+      "dev": true,
+      "bin": {
+        "uuid": "bin/uuid"
+      }
     },
-    "v8flags": {
+    "node_modules/v8flags": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/v8flags/-/v8flags-2.1.1.tgz",
       "integrity": "sha1-qrGh+jDUX4jdMhFIh1rALAtV5bQ=",
       "dev": true,
-      "requires": {
+      "dependencies": {
         "user-home": "^1.1.1"
+      },
+      "engines": {
+        "node": ">= 0.10.0"
       }
     },
-    "validate-npm-package-license": {
+    "node_modules/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==",
       "dev": true,
-      "requires": {
+      "dependencies": {
         "spdx-correct": "^3.0.0",
         "spdx-expression-parse": "^3.0.0"
       }
     },
-    "verror": {
+    "node_modules/verror": {
       "version": "1.10.0",
       "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
       "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
       "dev": true,
-      "requires": {
+      "engines": [
+        "node >=0.6.0"
+      ],
+      "dependencies": {
         "assert-plus": "^1.0.0",
         "core-util-is": "1.0.2",
         "extsprintf": "^1.2.0"
       }
     },
-    "which": {
+    "node_modules/which": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/which/-/which-1.3.0.tgz",
       "integrity": "sha512-xcJpopdamTuY5duC/KnTTNBraPK54YwpenP4lzxU8H91GudWpFv38u0CKjclE1Wi2EH2EDz5LRcHcKbCIzqGyg==",
       "dev": true,
-      "requires": {
+      "dependencies": {
         "isexe": "^2.0.0"
+      },
+      "bin": {
+        "which": "bin/which"
       }
     },
-    "which-module": {
+    "node_modules/which-module": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
       "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
       "dev": true
     },
-    "wordwrap": {
+    "node_modules/wordwrap": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
       "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus=",
       "dev": true
     },
-    "wrap-ansi": {
+    "node_modules/wrap-ansi": {
       "version": "5.1.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-5.1.0.tgz",
       "integrity": "sha512-QC1/iN/2/RPVJ5jYK8BGttj5z83LmSKmvbvrXPNCLZSEb32KKVDJDl/MOt2N01qU2H/FkzEa9PKto1BqDjtd7Q==",
       "dev": true,
-      "requires": {
+      "dependencies": {
         "ansi-styles": "^3.2.0",
         "string-width": "^3.0.0",
         "strip-ansi": "^5.0.0"
       },
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/wrap-ansi/node_modules/ansi-regex": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+      "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+      "dev": true,
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/wrap-ansi/node_modules/ansi-styles": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
+      "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
+      "dev": true,
+      "dependencies": {
+        "color-convert": "^1.9.0"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/wrap-ansi/node_modules/string-width": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+      "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+      "dev": true,
+      "dependencies": {
+        "emoji-regex": "^7.0.1",
+        "is-fullwidth-code-point": "^2.0.0",
+        "strip-ansi": "^5.1.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/wrap-ansi/node_modules/strip-ansi": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+      "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+      "dev": true,
       "dependencies": {
-        "ansi-regex": {
-          "version": "4.1.0",
-          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
-          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
-          "dev": true
-        },
-        "ansi-styles": {
-          "version": "3.2.1",
-          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
-          "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
-          "dev": true,
-          "requires": {
-            "color-convert": "^1.9.0"
-          }
-        },
-        "string-width": {
-          "version": "3.1.0",
-          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
-          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
-          "dev": true,
-          "requires": {
-            "emoji-regex": "^7.0.1",
-            "is-fullwidth-code-point": "^2.0.0",
-            "strip-ansi": "^5.1.0"
-          }
-        },
-        "strip-ansi": {
-          "version": "5.2.0",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
-          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
-          "dev": true,
-          "requires": {
-            "ansi-regex": "^4.1.0"
-          }
-        }
-      }
-    },
-    "wrappy": {
+        "ansi-regex": "^4.1.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
       "dev": true
     },
-    "write": {
+    "node_modules/write": {
       "version": "0.2.1",
       "resolved": "https://registry.npmjs.org/write/-/write-0.2.1.tgz",
       "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
       "dev": true,
-      "requires": {
+      "dependencies": {
         "mkdirp": "^0.5.1"
+      },
+      "engines": {
+        "node": ">=0.10.0"
       }
     },
-    "write-file-atomic": {
+    "node_modules/write-file-atomic": {
       "version": "2.4.2",
       "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.4.2.tgz",
       "integrity": "sha512-s0b6vB3xIVRLWywa6X9TOMA7k9zio0TMOsl9ZnDkliA/cfJlpHXAscj0gbHVJiTdIuAYpIyqS5GW91fqm6gG5g==",
       "dev": true,
-      "requires": {
+      "dependencies": {
         "graceful-fs": "^4.1.11",
         "imurmurhash": "^0.1.4",
         "signal-exit": "^3.0.2"
       }
     },
-    "y18n": {
+    "node_modules/y18n": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
       "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
       "dev": true
     },
-    "yallist": {
+    "node_modules/yallist": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
       "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
       "dev": true
     },
-    "yargs": {
+    "node_modules/yargs": {
       "version": "13.2.4",
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.2.4.tgz",
       "integrity": "sha512-HG/DWAJa1PAnHT9JAhNa8AbAv3FPaiLzioSjCcmuXXhP8MlpHO5vwls4g4j6n30Z74GVQj8Xa62dWVx1QCGklg==",
       "dev": true,
-      "requires": {
+      "dependencies": {
         "cliui": "^5.0.0",
         "find-up": "^3.0.0",
         "get-caller-file": "^2.0.1",
@@ -4483,45 +5489,52 @@
         "which-module": "^2.0.0",
         "y18n": "^4.0.0",
         "yargs-parser": "^13.1.0"
-      },
-      "dependencies": {
-        "ansi-regex": {
-          "version": "4.1.0",
-          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
-          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
-          "dev": true
-        },
-        "string-width": {
-          "version": "3.1.0",
-          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
-          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
-          "dev": true,
-          "requires": {
-            "emoji-regex": "^7.0.1",
-            "is-fullwidth-code-point": "^2.0.0",
-            "strip-ansi": "^5.1.0"
-          }
-        },
-        "strip-ansi": {
-          "version": "5.2.0",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
-          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
-          "dev": true,
-          "requires": {
-            "ansi-regex": "^4.1.0"
-          }
-        }
-      }
-    },
-    "yargs-parser": {
+      }
+    },
+    "node_modules/yargs-parser": {
       "version": "13.1.2",
       "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.2.tgz",
       "integrity": "sha512-3lbsNRf/j+A4QuSZfDRA7HRSfWrzO0YjqTJd5kjAq37Zep1CEgaYmrH9Q3GwPiB9cHyd1Y1UwggGhJGoxipbzg==",
       "dev": true,
-      "requires": {
+      "dependencies": {
         "camelcase": "^5.0.0",
         "decamelize": "^1.2.0"
       }
+    },
+    "node_modules/yargs/node_modules/ansi-regex": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+      "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+      "dev": true,
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/yargs/node_modules/string-width": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+      "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+      "dev": true,
+      "dependencies": {
+        "emoji-regex": "^7.0.1",
+        "is-fullwidth-code-point": "^2.0.0",
+        "strip-ansi": "^5.1.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/yargs/node_modules/strip-ansi": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+      "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+      "dev": true,
+      "dependencies": {
+        "ansi-regex": "^4.1.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
     }
   }
 }
diff --git a/stacktracey.js b/stacktracey.js
index b86b6db..89829a4 100644
--- a/stacktracey.js
+++ b/stacktracey.js
@@ -17,10 +17,10 @@ const O              = Object,
 class StackTracey {
 
     constructor (input, offset) {
-        
+
         const originalInput          = input
             , isParseableSyntaxError = input && (input instanceof SyntaxError && !isBrowser)
-                
+
     /*  new StackTracey ()            */
 
         if (!input) {
@@ -45,7 +45,7 @@ class StackTracey {
         if (Array.isArray (input)) {
 
             if (isParseableSyntaxError) {
-                
+
                 const rawLines = nodeRequire ('util').inspect (originalInput).split ('\n')
                     , fileLine = rawLines[0].split (':')
                     , line = fileLine.pop ()
@@ -95,7 +95,7 @@ class StackTracey {
 
     decomposePath (fullPath) {
         let result = fullPath
-        
+
         if (isBrowser) result = result.replace (pathRoot, '')
 
         const externalDomainMatch = result.match (/^(http|https)\:\/\/?([^\/]+)\/(.*)/)
@@ -146,7 +146,7 @@ class StackTracey {
 
         /*  Detect things like Array.reduce
             TODO: detect more built-in types            */
-            
+
             if (callee && !fileLineColumn[0]) {
                 const type = callee.split ('.')[0]
                 if (type === 'Array') {
@@ -177,10 +177,10 @@ class StackTracey {
     }
 
     withSource (loc) {
-        
+
         if (this.shouldSkipResolving (loc)) {
             return loc
-            
+
         } else {
 
             let resolved = getSource (loc.file || '').resolve (loc)
@@ -197,7 +197,7 @@ class StackTracey {
 
         if (this.shouldSkipResolving (loc)) {
             return Promise.resolve (loc)
-            
+
         } else {
             return getSource.async (loc.file || '')
                         .then (x => x.resolve (loc))
@@ -236,11 +236,11 @@ class StackTracey {
 
     withSourcesAsync () {
         return Promise.all (this.items.map (x => this.withSourceAsync (x)))
-                      .then (items => new StackTracey (items))
+                      .then (items => new this.constructor (items))
     }
 
     mergeRepeatedLines () {
-        return new StackTracey (
+        return new this.constructor (
             partition (this.items, e => e.file + e.line).map (
                 group => {
                     return group.items.slice (1).reduce ((memo, entry) => {
@@ -287,7 +287,7 @@ class StackTracey {
 
         const maxColumnWidths = (opts && opts.maxColumnWidths) || this.maxColumnWidths ()
 
-        const trimEnd   = (s, n) => s && ((s.length > n) ? (s.slice (0, n-1) + '…') : s)   
+        const trimEnd   = (s, n) => s && ((s.length > n) ? (s.slice (0, n-1) + '…') : s)
         const trimStart = (s, n) => s && ((s.length > n) ? ('…' + s.slice (-(n-1))) : s)
 
         const trimmed = this.map (
@@ -329,11 +329,10 @@ class StackTracey {
 ;['map', 'filter', 'slice', 'concat'].forEach (method => {
 
     StackTracey.prototype[method] = function (/*...args */) { // no support for ...args in Node v4 :(
-        return new StackTracey (this.items[method].apply (this.items, arguments))
+        return new this.constructor (this.items[method].apply (this.items, arguments))
     }
 })
 
 /*  ------------------------------------------------------------------------ */
 
 module.exports = StackTracey
-