New Upstream Release - node-symbol-observable

Ready changes

Summary

Merged new upstream version: 4.0.0 (was: 3.0.0).

Diff

diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..176a458
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1 @@
+* text=auto
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..92b258f
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+node_modules
+lib
+ts-test/test.js
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..5afe0f4
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,9 @@
+language: node_js
+node_js:
+  - 14
+  - 12
+  - 10
+  - 8
+  - 6
+  - 4
+  - 0.12
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 633cfee..168dd88 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,22 @@
+# [4.0.0](https://github.com/blesh/symbol-observable/compare/3.0.0...4.0.0) (2021-04-15)
+
+
+### Bug Fixes
+
+* If Symbol.for doesn't exist, just use Symbol ([ef81924](https://github.com/blesh/symbol-observable/commit/ef81924c506ba2fcc171a9b9b78a7a290fbff7b2)), closes [#53](https://github.com/blesh/symbol-observable/issues/53)
+
+
+### Code Refactoring
+
+* Revert to `symbol` from `unique symbol`, the latter caused compatibility issues and provided no real benefit. ([72ce7dc](https://github.com/blesh/symbol-observable/commit/72ce7dcc5d22f8a67ec928b61e879e1ded7a0869))
+
+
+### BREAKING CHANGES
+
+* Following the advice of the TypeScript team, the type for `Symbol.observable` is reverted back to `symbol` from `unique symbol`. This is to improve compatibility with other libraries using this module. Sincerely sorry for the trashing. Getting the types right for modules is hard. If this continues to cause issues for you, please file an issue with the [TypeScript project](https://github.com/microsoft/typescript).
+
+
+
 # [3.0.0](https://github.com/blesh/symbol-observable/compare/2.0.3...3.0.0) (2020-11-02)
 
 
diff --git a/README.md b/README.md
index 5464518..cd93e4c 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,8 @@
 # symbol-observable [![Build Status](https://travis-ci.org/benlesh/symbol-observable.svg?branch=master)](https://travis-ci.org/benlesh/symbol-observable)
 
-> [`Symbol.observable`](https://github.com/zenparsing/es-observable) [ponyfill](https://ponyfill.com)
+> [`Symbol.observable`](https://github.com/zenparsing/es-observable) [pony/polyfill](https://ponyfill.com)
+
+This will polyfill `Symbol.observable` if `Symbol` exists, but will not polyfill `Symbol` if it doesn't exist. Meant to be used as a "ponyfill", meaning you're meant to use the module's exported symbol value as described below. This is all done to ensure that everyone is using the same version of the symbol (or string depending on the environment), as per the nature of symbols in JavaScript.
 
 
 ## Install
diff --git a/debian/changelog b/debian/changelog
index d7d83d5..6a99bee 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+node-symbol-observable (4.0.0-1) UNRELEASED; urgency=low
+
+  * New upstream release.
+
+ -- Debian Janitor <janitor@jelmer.uk>  Mon, 14 Aug 2023 05:39:57 -0000
+
 node-symbol-observable (3.0.0-2) unstable; urgency=medium
 
   * Team upload
diff --git a/debian/patches/use-babel7.patch b/debian/patches/use-babel7.patch
index d2cf0f5..92fefc2 100644
--- a/debian/patches/use-babel7.patch
+++ b/debian/patches/use-babel7.patch
@@ -1,7 +1,9 @@
 babel 7 recommends using @babel/env preset
 
---- a/.babelrc
-+++ b/.babelrc
+Index: node-symbol-observable.git/.babelrc
+===================================================================
+--- node-symbol-observable.git.orig/.babelrc
++++ node-symbol-observable.git/.babelrc
 @@ -1,3 +1,3 @@
  {
 -  "presets": ["es2015", "es3"]
diff --git a/es/ponyfill.js b/es/ponyfill.js
index 7105662..7f2cd0e 100644
--- a/es/ponyfill.js
+++ b/es/ponyfill.js
@@ -7,10 +7,17 @@ export default function symbolObservablePonyfill(root) {
 			result = Symbol.observable;
 		} else {
 
-			// This just needs to be something that won't trample other user's Symbol.for use
-			// It also will guide people to the source of their issues, if this is problematic.
-			// META: It's a resource locator!
-			result = Symbol.for('https://github.com/benlesh/symbol-observable');
+			if (typeof Symbol.for === 'function') {
+				// This just needs to be something that won't trample other user's Symbol.for use
+				// It also will guide people to the source of their issues, if this is problematic.
+				// META: It's a resource locator!
+				result = Symbol.for('https://github.com/benlesh/symbol-observable');
+			} else {
+				// Symbol.for didn't exist! The best we can do at this point is a totally 
+				// unique symbol. Note that the string argument here is a descriptor, not
+				// an identifier. This symbol is unique.
+				result = Symbol('https://github.com/benlesh/symbol-observable');
+			}
 			try {
 				Symbol.observable = result;
 			} catch (err) {
diff --git a/index.d.ts b/index.d.ts
index 8f77836..c74bade 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -3,6 +3,6 @@ export default observableSymbol;
 
 declare global {
   export interface SymbolConstructor {
-    readonly observable: unique symbol;
+    readonly observable: symbol;
   }
 }
diff --git a/license b/license
index 0239f47..b07f7a8 100644
--- a/license
+++ b/license
@@ -1,7 +1,7 @@
 The MIT License (MIT)
 
-Copyright (c) Sindre Sorhus <sindresorhus@gmail.com> (sindresorhus.com)
-Copyright (c) Ben Lesh <ben@benlesh.com>
+Copyright (c) 2021 Sindre Sorhus <sindresorhus@gmail.com> (sindresorhus.com)
+Copyright (c) 2021 Ben Lesh <ben@benlesh.com>
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/package-lock.json b/package-lock.json
index 119e0b4..7cbdb5f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "symbol-observable",
-  "version": "1.0.4",
+  "version": "3.0.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -35,8 +35,8 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "micromatch": "2.3.11",
-        "normalize-path": "2.1.1"
+        "micromatch": "^2.1.5",
+        "normalize-path": "^2.0.0"
       }
     },
     "arr-diff": {
@@ -46,7 +46,7 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "arr-flatten": "1.1.0"
+        "arr-flatten": "^1.0.1"
       }
     },
     "arr-flatten": {
@@ -88,21 +88,21 @@
       "integrity": "sha1-UCq1SHTX24itALiHoGODzgPQAvE=",
       "dev": true,
       "requires": {
-        "babel-core": "6.26.0",
-        "babel-polyfill": "6.26.0",
-        "babel-register": "6.26.0",
-        "babel-runtime": "6.26.0",
-        "chokidar": "1.7.0",
-        "commander": "2.12.2",
-        "convert-source-map": "1.5.1",
-        "fs-readdir-recursive": "1.1.0",
-        "glob": "7.1.2",
-        "lodash": "4.17.4",
-        "output-file-sync": "1.1.2",
-        "path-is-absolute": "1.0.1",
-        "slash": "1.0.0",
-        "source-map": "0.5.7",
-        "v8flags": "2.1.1"
+        "babel-core": "^6.26.0",
+        "babel-polyfill": "^6.26.0",
+        "babel-register": "^6.26.0",
+        "babel-runtime": "^6.26.0",
+        "chokidar": "^1.6.1",
+        "commander": "^2.11.0",
+        "convert-source-map": "^1.5.0",
+        "fs-readdir-recursive": "^1.0.0",
+        "glob": "^7.1.2",
+        "lodash": "^4.17.4",
+        "output-file-sync": "^1.1.2",
+        "path-is-absolute": "^1.0.1",
+        "slash": "^1.0.0",
+        "source-map": "^0.5.6",
+        "v8flags": "^2.1.1"
       }
     },
     "babel-code-frame": {
@@ -111,9 +111,9 @@
       "integrity": "sha1-Y/1D99weO7fONZR9uP42mj9Yx0s=",
       "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"
       }
     },
     "babel-core": {
@@ -122,25 +122,25 @@
       "integrity": "sha1-rzL3izGm/O8RnIew/Y2XU/A6C7g=",
       "dev": true,
       "requires": {
-        "babel-code-frame": "6.26.0",
-        "babel-generator": "6.26.0",
-        "babel-helpers": "6.24.1",
-        "babel-messages": "6.23.0",
-        "babel-register": "6.26.0",
-        "babel-runtime": "6.26.0",
-        "babel-template": "6.26.0",
-        "babel-traverse": "6.26.0",
-        "babel-types": "6.26.0",
-        "babylon": "6.18.0",
-        "convert-source-map": "1.5.1",
-        "debug": "2.6.9",
-        "json5": "0.5.1",
-        "lodash": "4.17.4",
-        "minimatch": "3.0.4",
-        "path-is-absolute": "1.0.1",
-        "private": "0.1.8",
-        "slash": "1.0.0",
-        "source-map": "0.5.7"
+        "babel-code-frame": "^6.26.0",
+        "babel-generator": "^6.26.0",
+        "babel-helpers": "^6.24.1",
+        "babel-messages": "^6.23.0",
+        "babel-register": "^6.26.0",
+        "babel-runtime": "^6.26.0",
+        "babel-template": "^6.26.0",
+        "babel-traverse": "^6.26.0",
+        "babel-types": "^6.26.0",
+        "babylon": "^6.18.0",
+        "convert-source-map": "^1.5.0",
+        "debug": "^2.6.8",
+        "json5": "^0.5.1",
+        "lodash": "^4.17.4",
+        "minimatch": "^3.0.4",
+        "path-is-absolute": "^1.0.1",
+        "private": "^0.1.7",
+        "slash": "^1.0.0",
+        "source-map": "^0.5.6"
       }
     },
     "babel-generator": {
@@ -149,14 +149,14 @@
       "integrity": "sha1-rBriAHC3n248odMmlhMFN3TyDcU=",
       "dev": true,
       "requires": {
-        "babel-messages": "6.23.0",
-        "babel-runtime": "6.26.0",
-        "babel-types": "6.26.0",
-        "detect-indent": "4.0.0",
-        "jsesc": "1.3.0",
-        "lodash": "4.17.4",
-        "source-map": "0.5.7",
-        "trim-right": "1.0.1"
+        "babel-messages": "^6.23.0",
+        "babel-runtime": "^6.26.0",
+        "babel-types": "^6.26.0",
+        "detect-indent": "^4.0.0",
+        "jsesc": "^1.3.0",
+        "lodash": "^4.17.4",
+        "source-map": "^0.5.6",
+        "trim-right": "^1.0.1"
       }
     },
     "babel-helper-call-delegate": {
@@ -165,10 +165,10 @@
       "integrity": "sha1-7Oaqzdx25Bw0YfiL/Fdb0Nqi340=",
       "dev": true,
       "requires": {
-        "babel-helper-hoist-variables": "6.24.1",
-        "babel-runtime": "6.26.0",
-        "babel-traverse": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-helper-hoist-variables": "^6.24.1",
+        "babel-runtime": "^6.22.0",
+        "babel-traverse": "^6.24.1",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-helper-define-map": {
@@ -177,10 +177,10 @@
       "integrity": "sha1-pfVtq0GiX5fstJjH66ypgZ+Vvl8=",
       "dev": true,
       "requires": {
-        "babel-helper-function-name": "6.24.1",
-        "babel-runtime": "6.26.0",
-        "babel-types": "6.26.0",
-        "lodash": "4.17.4"
+        "babel-helper-function-name": "^6.24.1",
+        "babel-runtime": "^6.26.0",
+        "babel-types": "^6.26.0",
+        "lodash": "^4.17.4"
       }
     },
     "babel-helper-function-name": {
@@ -189,11 +189,11 @@
       "integrity": "sha1-00dbjAPtmCQqJbSDUasYOZ01gKk=",
       "dev": true,
       "requires": {
-        "babel-helper-get-function-arity": "6.24.1",
-        "babel-runtime": "6.26.0",
-        "babel-template": "6.26.0",
-        "babel-traverse": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-helper-get-function-arity": "^6.24.1",
+        "babel-runtime": "^6.22.0",
+        "babel-template": "^6.24.1",
+        "babel-traverse": "^6.24.1",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-helper-get-function-arity": {
@@ -202,8 +202,8 @@
       "integrity": "sha1-j3eCqpNAfEHTqlCQj4mwMbG2hT0=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-runtime": "^6.22.0",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-helper-hoist-variables": {
@@ -212,8 +212,8 @@
       "integrity": "sha1-HssnaJydJVE+rbyZFKc/VAi+enY=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-runtime": "^6.22.0",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-helper-optimise-call-expression": {
@@ -222,8 +222,8 @@
       "integrity": "sha1-96E0J7qfc/j0+pk8VKl4gtEkQlc=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-runtime": "^6.22.0",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-helper-regex": {
@@ -232,9 +232,9 @@
       "integrity": "sha1-MlxZ+QL4LyS3T6zu0DY5VPZJXnI=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0",
-        "babel-types": "6.26.0",
-        "lodash": "4.17.4"
+        "babel-runtime": "^6.26.0",
+        "babel-types": "^6.26.0",
+        "lodash": "^4.17.4"
       }
     },
     "babel-helper-replace-supers": {
@@ -243,12 +243,12 @@
       "integrity": "sha1-v22/5Dk40XNpohPKiov3S2qQqxo=",
       "dev": true,
       "requires": {
-        "babel-helper-optimise-call-expression": "6.24.1",
-        "babel-messages": "6.23.0",
-        "babel-runtime": "6.26.0",
-        "babel-template": "6.26.0",
-        "babel-traverse": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-helper-optimise-call-expression": "^6.24.1",
+        "babel-messages": "^6.23.0",
+        "babel-runtime": "^6.22.0",
+        "babel-template": "^6.24.1",
+        "babel-traverse": "^6.24.1",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-helpers": {
@@ -257,8 +257,8 @@
       "integrity": "sha1-NHHenK7DiOXIUOWX5Yom3fN2ArI=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0",
-        "babel-template": "6.26.0"
+        "babel-runtime": "^6.22.0",
+        "babel-template": "^6.24.1"
       }
     },
     "babel-messages": {
@@ -267,7 +267,7 @@
       "integrity": "sha1-8830cDhYA1sqKVHG7F7fbGLyYw4=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0"
+        "babel-runtime": "^6.22.0"
       }
     },
     "babel-plugin-check-es2015-constants": {
@@ -276,7 +276,7 @@
       "integrity": "sha1-NRV7EBQm/S/9PaP3XH0ekYNbv4o=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0"
+        "babel-runtime": "^6.22.0"
       }
     },
     "babel-plugin-transform-es2015-arrow-functions": {
@@ -285,7 +285,7 @@
       "integrity": "sha1-RSaSy3EdX3ncf4XkQM5BufJE0iE=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0"
+        "babel-runtime": "^6.22.0"
       }
     },
     "babel-plugin-transform-es2015-block-scoped-functions": {
@@ -294,7 +294,7 @@
       "integrity": "sha1-u8UbSflk1wy42OC5ToICRs46YUE=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0"
+        "babel-runtime": "^6.22.0"
       }
     },
     "babel-plugin-transform-es2015-block-scoping": {
@@ -303,11 +303,11 @@
       "integrity": "sha1-1w9SmcEwjQXBL0Y4E7CgnnOxiV8=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0",
-        "babel-template": "6.26.0",
-        "babel-traverse": "6.26.0",
-        "babel-types": "6.26.0",
-        "lodash": "4.17.4"
+        "babel-runtime": "^6.26.0",
+        "babel-template": "^6.26.0",
+        "babel-traverse": "^6.26.0",
+        "babel-types": "^6.26.0",
+        "lodash": "^4.17.4"
       }
     },
     "babel-plugin-transform-es2015-classes": {
@@ -316,15 +316,15 @@
       "integrity": "sha1-WkxYpQyclGHlZLSyo7+ryXolhNs=",
       "dev": true,
       "requires": {
-        "babel-helper-define-map": "6.26.0",
-        "babel-helper-function-name": "6.24.1",
-        "babel-helper-optimise-call-expression": "6.24.1",
-        "babel-helper-replace-supers": "6.24.1",
-        "babel-messages": "6.23.0",
-        "babel-runtime": "6.26.0",
-        "babel-template": "6.26.0",
-        "babel-traverse": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-helper-define-map": "^6.24.1",
+        "babel-helper-function-name": "^6.24.1",
+        "babel-helper-optimise-call-expression": "^6.24.1",
+        "babel-helper-replace-supers": "^6.24.1",
+        "babel-messages": "^6.23.0",
+        "babel-runtime": "^6.22.0",
+        "babel-template": "^6.24.1",
+        "babel-traverse": "^6.24.1",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-plugin-transform-es2015-computed-properties": {
@@ -333,8 +333,8 @@
       "integrity": "sha1-b+Ko0WiV1WNPTNmZttNICjCBWbM=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0",
-        "babel-template": "6.26.0"
+        "babel-runtime": "^6.22.0",
+        "babel-template": "^6.24.1"
       }
     },
     "babel-plugin-transform-es2015-destructuring": {
@@ -343,7 +343,7 @@
       "integrity": "sha1-mXux8auWf2gtKwh2/jWNYOdlxW0=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0"
+        "babel-runtime": "^6.22.0"
       }
     },
     "babel-plugin-transform-es2015-duplicate-keys": {
@@ -352,8 +352,8 @@
       "integrity": "sha1-c+s9MQypaePvnskcU3QabxV2Qj4=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-runtime": "^6.22.0",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-plugin-transform-es2015-for-of": {
@@ -362,7 +362,7 @@
       "integrity": "sha1-9HyVsrYT3x0+zC/bdXNiPHUkhpE=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0"
+        "babel-runtime": "^6.22.0"
       }
     },
     "babel-plugin-transform-es2015-function-name": {
@@ -371,9 +371,9 @@
       "integrity": "sha1-g0yJhTvDaxrw86TF26qU/Y6sqos=",
       "dev": true,
       "requires": {
-        "babel-helper-function-name": "6.24.1",
-        "babel-runtime": "6.26.0",
-        "babel-types": "6.26.0"
+        "babel-helper-function-name": "^6.24.1",
+        "babel-runtime": "^6.22.0",
+        "babel-types": "^6.24.1"
       }
     },
     "babel-plugin-transform-es2015-literals": {
@@ -382,7 +382,7 @@
       "integrity": "sha1-T1SgLWzWbPkVKAAZox0xklN3yi4=",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0"
+        "babel-runtime": "^6.22.0"
       }
     },
     "babel-plugin-transform-es2015-modules-amd": {
@@ -391,9 +391,9 @@
       "integrity": "sha1-Oz5UAXI5hC1tGcMBHEvS8AoA0VQ=",
       "dev": true,
       "requires": {
-        "babel-plugin-transform-es2015-modules-commonjs": "6.26.0",
-        "babel-runtime": "6.26.0",
-        "babel-template": "6.26.0"
+        "babel-plugin-transform-es2015-modules-commonjs": "^6.24.1",
+        "babel-runtime": "^6.22.0",
+        "babel-template": "^6.24.1"
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@@ -642,11 +642,11 @@
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@@ -655,15 +655,15 @@
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@@ -715,7 +715,7 @@
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@@ -749,9 +749,9 @@
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@@ -760,11 +760,11 @@
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-        "has-ansi": "2.0.0",
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-        "supports-color": "2.0.0"
+        "ansi-styles": "^2.2.1",
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@@ -773,11 +773,11 @@
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-        "es3ify": "0.2.2",
-        "fs-readdir-recursive": "1.1.0",
-        "lodash.flatten": "4.4.0"
+        "bluebird": "^3.4.6",
+        "diff": "^3.0.1",
+        "es3ify": "^0.2.2",
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-        "yargs": "6.6.0"
+        "chalk": "^1.1.3",
+        "check-es3-syntax": "^1.0.1",
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@@ -798,14 +798,15 @@
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-        "path-is-absolute": "1.0.1",
-        "readdirp": "2.1.0"
+        "anymatch": "^1.3.0",
+        "async-each": "^1.0.0",
+        "fsevents": "^1.0.0",
+        "glob-parent": "^2.0.0",
+        "inherits": "^2.0.1",
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@@ -814,9 +815,9 @@
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-        "strip-ansi": "3.0.1",
-        "wrap-ansi": "2.1.0"
+        "string-width": "^1.0.1",
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@@ -837,15 +838,15 @@
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-        "mkdirp": "0.5.1",
-        "private": "0.1.8",
-        "q": "1.5.1",
-        "recast": "0.11.23"
+        "commander": "^2.5.0",
+        "detective": "^4.3.1",
+        "glob": "^5.0.15",
+        "graceful-fs": "^4.1.2",
+        "iconv-lite": "^0.4.5",
+        "mkdirp": "^0.5.0",
+        "private": "^0.1.6",
+        "q": "^1.1.2",
+        "recast": "^0.11.17"
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@@ -854,11 +855,11 @@
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-            "minimatch": "3.0.4",
-            "once": "1.4.0",
-            "path-is-absolute": "1.0.1"
+            "inflight": "^1.0.4",
+            "inherits": "2",
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@@ -932,7 +933,7 @@
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       "dev": true,
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+        "repeating": "^2.0.0"
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@@ -941,8 +942,8 @@
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-        "defined": "1.0.0"
+        "acorn": "^5.2.1",
+        "defined": "^1.0.0"
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@@ -957,7 +958,7 @@
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       "dev": true,
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-        "is-arrayish": "0.2.1"
+        "is-arrayish": "^0.2.1"
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@@ -966,9 +967,9 @@
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-        "jstransform": "11.0.3",
-        "through": "2.3.8"
+        "esprima": "^2.7.1",
+        "jstransform": "~11.0.0",
+        "through": "~2.3.4"
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@@ -996,7 +997,7 @@
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@@ -1033,11 +1034,11 @@
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@@ -1046,8 +1047,8 @@
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-        "pinkie-promise": "2.0.1"
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@@ -1064,7 +1065,7 @@
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@@ -1079,6 +1080,13 @@
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-        "inherits": "2.0.3",
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-        "once": "1.4.0",
-        "path-is-absolute": "1.0.1"
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@@ -1143,7 +1152,7 @@
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       "dev": true,
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@@ -1152,8 +1161,8 @@
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-        "os-tmpdir": "1.0.2"
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@@ -1174,8 +1183,8 @@
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-        "wrappy": "1.0.2"
+        "once": "^1.3.0",
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@@ -1190,7 +1199,7 @@
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@@ -1212,14 +1221,15 @@
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@@ -1227,7 +1237,7 @@
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@@ -1244,7 +1254,7 @@
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@@ -1258,7 +1268,8 @@
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-      "dev": true
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@@ -1266,7 +1277,7 @@
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       "dev": true,
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@@ -1275,7 +1286,7 @@
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       "dev": true,
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-        "number-is-nan": "1.0.1"
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@@ -1283,8 +1294,9 @@
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       "integrity": "sha1-0Jb5JqPe1WAPP9/ZEZjLCIjC2GM=",
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@@ -1294,7 +1306,7 @@
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+        "kind-of": "^3.0.2"
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@@ -1321,7 +1333,8 @@
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       "integrity": "sha1-u5NdSFgsuhaMBoNJV6VKPgcSTxE=",
-      "dev": true
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@@ -1381,11 +1394,11 @@
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-        "esprima-fb": "15001.1.0-dev-harmony-fb",
-        "object-assign": "2.1.1",
-        "source-map": "0.4.4"
+        "base62": "^1.1.0",
+        "commoner": "^0.10.1",
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@@ -1406,7 +1419,7 @@
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           "dev": true,
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@@ -1416,8 +1429,9 @@
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@@ -1426,7 +1440,7 @@
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       "dev": true,
       "requires": {
-        "invert-kv": "1.0.0"
+        "invert-kv": "^1.0.0"
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@@ -1435,17 +1449,17 @@
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-        "pify": "2.3.0",
-        "pinkie-promise": "2.0.1",
-        "strip-bom": "2.0.0"
+        "graceful-fs": "^4.1.2",
+        "parse-json": "^2.2.0",
+        "pify": "^2.0.0",
+        "pinkie-promise": "^2.0.0",
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-      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.4.tgz",
-      "integrity": "sha1-eCA6TRwyiuHYbcpkYONptX9AVa4=",
+      "version": "4.17.20",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.20.tgz",
+      "integrity": "sha512-PlhdFcillOINfeV7Ni6oF1TAEayyZBoZ8bcshTHqOYJYlrqzRK5hagpagky5o4HfCzzd1TRkXPMFq6cKk9rGmA==",
       "dev": true
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@@ -1460,7 +1474,7 @@
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       "dev": true,
       "requires": {
-        "js-tokens": "3.0.2"
+        "js-tokens": "^3.0.0"
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@@ -1476,19 +1490,19 @@
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-        "object.omit": "2.0.1",
-        "parse-glob": "3.0.4",
-        "regex-cache": "0.4.4"
+        "arr-diff": "^2.0.0",
+        "array-unique": "^0.2.1",
+        "braces": "^1.8.2",
+        "expand-brackets": "^0.1.4",
+        "extglob": "^0.3.1",
+        "filename-regex": "^2.0.0",
+        "is-extglob": "^1.0.0",
+        "is-glob": "^2.0.1",
+        "kind-of": "^3.0.2",
+        "normalize-path": "^2.0.1",
+        "object.omit": "^2.0.0",
+        "parse-glob": "^3.0.4",
+        "regex-cache": "^0.4.2"
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@@ -1497,7 +1511,7 @@
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       "dev": true,
       "requires": {
-        "brace-expansion": "1.1.8"
+        "brace-expansion": "^1.1.7"
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@@ -1566,8 +1580,8 @@
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           "dev": true,
           "requires": {
-            "inherits": "2.0.3",
-            "minimatch": "0.3.0"
+            "inherits": "2",
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@@ -1576,8 +1590,8 @@
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           "dev": true,
           "requires": {
-            "lru-cache": "2.7.3",
-            "sigmund": "1.0.1"
+            "lru-cache": "2",
+            "sigmund": "~1.0.0"
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@@ -1606,10 +1620,10 @@
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       "dev": true,
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-        "is-builtin-module": "1.0.0",
-        "semver": "5.4.1",
-        "validate-npm-package-license": "3.0.1"
+        "hosted-git-info": "^2.1.4",
+        "is-builtin-module": "^1.0.0",
+        "semver": "2 || 3 || 4 || 5",
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@@ -1617,8 +1631,9 @@
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       "integrity": "sha1-GrKLVW4Zg2Oowab35vogE3/mrtk=",
       "dev": true,
+      "optional": true,
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+        "remove-trailing-separator": "^1.0.1"
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@@ -1640,8 +1655,8 @@
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-        "is-extendable": "0.1.1"
+        "for-own": "^0.1.4",
+        "is-extendable": "^0.1.1"
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@@ -1650,7 +1665,7 @@
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       "dev": true,
       "requires": {
-        "wrappy": "1.0.2"
+        "wrappy": "1"
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@@ -1665,7 +1680,7 @@
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       "dev": true,
       "requires": {
-        "lcid": "1.0.0"
+        "lcid": "^1.0.0"
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@@ -1680,9 +1695,9 @@
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       "requires": {
-        "graceful-fs": "4.1.11",
-        "mkdirp": "0.5.1",
-        "object-assign": "4.1.1"
+        "graceful-fs": "^4.1.4",
+        "mkdirp": "^0.5.1",
+        "object-assign": "^4.1.0"
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@@ -1692,10 +1707,10 @@
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-        "is-dotfile": "1.0.3",
-        "is-extglob": "1.0.0",
-        "is-glob": "2.0.1"
+        "glob-base": "^0.3.0",
+        "is-dotfile": "^1.0.0",
+        "is-extglob": "^1.0.0",
+        "is-glob": "^2.0.0"
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@@ -1704,7 +1719,7 @@
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       "dev": true,
       "requires": {
-        "error-ex": "1.3.1"
+        "error-ex": "^1.2.0"
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@@ -1713,7 +1728,7 @@
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       "dev": true,
       "requires": {
-        "pinkie-promise": "2.0.1"
+        "pinkie-promise": "^2.0.0"
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@@ -1728,9 +1743,9 @@
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-        "graceful-fs": "4.1.11",
-        "pify": "2.3.0",
-        "pinkie-promise": "2.0.1"
+        "graceful-fs": "^4.1.2",
+        "pify": "^2.0.0",
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@@ -1751,7 +1766,7 @@
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       "dev": true,
       "requires": {
-        "pinkie": "2.0.4"
+        "pinkie": "^2.0.0"
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@@ -1787,8 +1802,8 @@
       "dev": true,
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-        "is-number": "3.0.0",
-        "kind-of": "4.0.0"
+        "is-number": "^3.0.0",
+        "kind-of": "^4.0.0"
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@@ -1798,7 +1813,7 @@
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+            "kind-of": "^3.0.2"
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@@ -1808,7 +1823,7 @@
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@@ -1820,7 +1835,7 @@
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@@ -1831,9 +1846,9 @@
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-        "load-json-file": "1.1.0",
-        "normalize-package-data": "2.4.0",
-        "path-type": "1.1.0"
+        "load-json-file": "^1.0.0",
+        "normalize-package-data": "^2.3.2",
+        "path-type": "^1.0.0"
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@@ -1842,8 +1857,8 @@
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       "dev": true,
       "requires": {
-        "find-up": "1.1.2",
-        "read-pkg": "1.1.0"
+        "find-up": "^1.0.0",
+        "read-pkg": "^1.0.0"
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@@ -1853,13 +1868,13 @@
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-        "safe-buffer": "5.1.1",
-        "string_decoder": "1.0.3",
-        "util-deprecate": "1.0.2"
+        "core-util-is": "~1.0.0",
+        "inherits": "~2.0.3",
+        "isarray": "~1.0.0",
+        "process-nextick-args": "~1.0.6",
+        "safe-buffer": "~5.1.1",
+        "string_decoder": "~1.0.3",
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@@ -1869,10 +1884,10 @@
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-        "minimatch": "3.0.4",
-        "readable-stream": "2.3.3",
-        "set-immediate-shim": "1.0.1"
+        "graceful-fs": "^4.1.2",
+        "minimatch": "^3.0.2",
+        "readable-stream": "^2.0.2",
+        "set-immediate-shim": "^1.0.1"
       }
     },
     "recast": {
@@ -1882,9 +1897,9 @@
       "dev": true,
       "requires": {
         "ast-types": "0.9.6",
-        "esprima": "3.1.3",
-        "private": "0.1.8",
-        "source-map": "0.5.7"
+        "esprima": "~3.1.0",
+        "private": "~0.1.5",
+        "source-map": "~0.5.0"
       },
       "dependencies": {
         "esprima": {
@@ -1913,9 +1928,9 @@
       "integrity": "sha512-PJepbvDbuK1xgIgnau7Y90cwaAmO/LCLMI2mPvaXq2heGMR3aWW5/BQvYrhJ8jgmQjXewXvBjzfqKcVOmhjZ6Q==",
       "dev": true,
       "requires": {
-        "babel-runtime": "6.26.0",
-        "babel-types": "6.26.0",
-        "private": "0.1.8"
+        "babel-runtime": "^6.18.0",
+        "babel-types": "^6.19.0",
+        "private": "^0.1.6"
       }
     },
     "regex-cache": {
@@ -1925,7 +1940,7 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "is-equal-shallow": "0.1.3"
+        "is-equal-shallow": "^0.1.3"
       }
     },
     "regexpu-core": {
@@ -1934,9 +1949,9 @@
       "integrity": "sha1-SdA4g3uNz4v6W5pCE5k45uoq4kA=",
       "dev": true,
       "requires": {
-        "regenerate": "1.3.3",
-        "regjsgen": "0.2.0",
-        "regjsparser": "0.1.5"
+        "regenerate": "^1.2.1",
+        "regjsgen": "^0.2.0",
+        "regjsparser": "^0.1.4"
       }
     },
     "regjsgen": {
@@ -1951,7 +1966,7 @@
       "integrity": "sha1-fuj4Tcb6eS0/0K4ijSS9lJ6tIFw=",
       "dev": true,
       "requires": {
-        "jsesc": "0.5.0"
+        "jsesc": "~0.5.0"
       },
       "dependencies": {
         "jsesc": {
@@ -1966,13 +1981,15 @@
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/remove-trailing-separator/-/remove-trailing-separator-1.1.0.tgz",
       "integrity": "sha1-wkvOKig62tW8P1jg1IJJuSN52O8=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "repeat-element": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/repeat-element/-/repeat-element-1.1.2.tgz",
       "integrity": "sha1-7wiaF40Ug7quTZPrmLT55OEdmQo=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "repeat-string": {
       "version": "1.6.1",
@@ -1987,7 +2004,7 @@
       "integrity": "sha1-UhTFOpJtNVJwdSf7q0FdvAjQbdo=",
       "dev": true,
       "requires": {
-        "is-finite": "1.0.2"
+        "is-finite": "^1.0.0"
       }
     },
     "require-directory": {
@@ -2006,7 +2023,8 @@
       "version": "5.1.1",
       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.1.tgz",
       "integrity": "sha512-kKvNJn6Mm93gAczWVJg7wH+wGYWNrDHdWvpUmHyEsgCtIwwo3bqPtV4tR5tuPaUhTOo/kvhVwd8XwwOllGYkbg==",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "semver": {
       "version": "5.4.1",
@@ -2051,7 +2069,7 @@
       "integrity": "sha512-try0/JqxPLF9nOjvSta7tVondkP5dwgyLDjVoyMDlmjugT2lRZ1OfsrYTkCd2hkDnJTKRbO/Rl3orm8vlsUzbA==",
       "dev": true,
       "requires": {
-        "source-map": "0.5.7"
+        "source-map": "^0.5.6"
       }
     },
     "spdx-correct": {
@@ -2060,7 +2078,7 @@
       "integrity": "sha1-SzBz2TP/UfORLwOsVRlJikFQ20A=",
       "dev": true,
       "requires": {
-        "spdx-license-ids": "1.2.2"
+        "spdx-license-ids": "^1.0.2"
       }
     },
     "spdx-expression-parse": {
@@ -2081,9 +2099,9 @@
       "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
       "dev": true,
       "requires": {
-        "code-point-at": "1.1.0",
-        "is-fullwidth-code-point": "1.0.0",
-        "strip-ansi": "3.0.1"
+        "code-point-at": "^1.0.0",
+        "is-fullwidth-code-point": "^1.0.0",
+        "strip-ansi": "^3.0.0"
       }
     },
     "string_decoder": {
@@ -2093,7 +2111,7 @@
       "dev": true,
       "optional": true,
       "requires": {
-        "safe-buffer": "5.1.1"
+        "safe-buffer": "~5.1.0"
       }
     },
     "strip-ansi": {
@@ -2102,7 +2120,7 @@
       "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
       "dev": true,
       "requires": {
-        "ansi-regex": "2.1.1"
+        "ansi-regex": "^2.0.0"
       }
     },
     "strip-bom": {
@@ -2111,7 +2129,7 @@
       "integrity": "sha1-YhmoVhZSBJHzV4i9vxRHqZx+aw4=",
       "dev": true,
       "requires": {
-        "is-utf8": "0.2.1"
+        "is-utf8": "^0.2.0"
       }
     },
     "supports-color": {
@@ -2151,9 +2169,9 @@
       "dev": true
     },
     "typescript": {
-      "version": "2.6.2",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-2.6.2.tgz",
-      "integrity": "sha1-PFtv1/beCRQmkCfwPAlGdY92c6Q=",
+      "version": "4.0.5",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.0.5.tgz",
+      "integrity": "sha512-ywmr/VrTVCmNTJ6iV2LwIrfG1P+lv6luD8sUJs+2eI9NLGigaN+nUQc13iHqisq7bra9lnmUSYqbJvegraBOPQ==",
       "dev": true
     },
     "user-home": {
@@ -2175,7 +2193,7 @@
       "integrity": "sha1-qrGh+jDUX4jdMhFIh1rALAtV5bQ=",
       "dev": true,
       "requires": {
-        "user-home": "1.1.1"
+        "user-home": "^1.1.1"
       }
     },
     "validate-npm-package-license": {
@@ -2184,8 +2202,8 @@
       "integrity": "sha1-KAS6vnEq0zeUWaz74kdGqywwP7w=",
       "dev": true,
       "requires": {
-        "spdx-correct": "1.0.2",
-        "spdx-expression-parse": "1.0.4"
+        "spdx-correct": "~1.0.0",
+        "spdx-expression-parse": "~1.0.0"
       }
     },
     "which-module": {
@@ -2200,8 +2218,8 @@
       "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
       "dev": true,
       "requires": {
-        "string-width": "1.0.2",
-        "strip-ansi": "3.0.1"
+        "string-width": "^1.0.1",
+        "strip-ansi": "^3.0.1"
       }
     },
     "wrappy": {
@@ -2222,19 +2240,19 @@
       "integrity": "sha1-eC7CHvQDNF+DCoCMo9UTr1YGUgg=",
       "dev": true,
       "requires": {
-        "camelcase": "3.0.0",
-        "cliui": "3.2.0",
-        "decamelize": "1.2.0",
-        "get-caller-file": "1.0.2",
-        "os-locale": "1.4.0",
-        "read-pkg-up": "1.0.1",
-        "require-directory": "2.1.1",
-        "require-main-filename": "1.0.1",
-        "set-blocking": "2.0.0",
-        "string-width": "1.0.2",
-        "which-module": "1.0.0",
-        "y18n": "3.2.1",
-        "yargs-parser": "4.2.1"
+        "camelcase": "^3.0.0",
+        "cliui": "^3.2.0",
+        "decamelize": "^1.1.1",
+        "get-caller-file": "^1.0.1",
+        "os-locale": "^1.4.0",
+        "read-pkg-up": "^1.0.1",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^1.0.1",
+        "set-blocking": "^2.0.0",
+        "string-width": "^1.0.2",
+        "which-module": "^1.0.0",
+        "y18n": "^3.2.1",
+        "yargs-parser": "^4.2.0"
       }
     },
     "yargs-parser": {
@@ -2243,7 +2261,7 @@
       "integrity": "sha1-KczqwNxPA8bIe0qfIX3RjJ90hxw=",
       "dev": true,
       "requires": {
-        "camelcase": "3.0.0"
+        "camelcase": "^3.0.0"
       }
     }
   }
diff --git a/package.json b/package.json
index b73447b..bd03d4f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "symbol-observable",
-  "version": "3.0.0",
+  "version": "4.0.0",
   "description": "Symbol.observable ponyfill",
   "license": "MIT",
   "repository": "blesh/symbol-observable",
@@ -42,7 +42,7 @@
     "chai": "^3.5.0",
     "check-es3-syntax-cli": "^0.1.0",
     "mocha": "^2.4.5",
-    "typescript": "^2.1.4"
+    "typescript": "^4.0.5"
   },
   "engines": {
     "node": ">=0.10"
diff --git a/test/ponyfill.js b/test/ponyfill.js
index 98948b2..808096e 100644
--- a/test/ponyfill.js
+++ b/test/ponyfill.js
@@ -36,6 +36,20 @@ describe('ponyfill unit tests', function () {
         expect(result).to.equal('@@_fakesymbol_0_https://github.com/benlesh/symbol-observable');
       });
 
+
+      it('should use Symbol if Symbol.for does not exist', function() {
+        var FakeSymbol = createFakeSymbolImpl();
+        delete FakeSymbol.for;
+        var root = {
+          Symbol: FakeSymbol
+        };
+
+        var result = ponyfill(root);
+
+        expect(FakeSymbol.observable).to.equal('@@_fakesymbol_0_https://github.com/benlesh/symbol-observable');
+        expect(result).to.equal('@@_fakesymbol_0_https://github.com/benlesh/symbol-observable');
+      });
+
       it('should not throw if Symbol is frozen', function () {
         'use strict';
         var FakeSymbol = createFakeSymbolImpl();

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