Commit

13 files changed, 483 insertions, 0 deletions

diff --git a/src/node_modules/is-symbol/.editorconfig b/src/node_modules/is-symbol/.editorconfig
new file mode 100644
index 0000000..eaa2141
--- /dev/null
+++ b/src/node_modules/is-symbol/.editorconfig
@@ -0,0 +1,13 @@
+root = true
+
+[*]
+indent_style = tab;
+insert_final_newline = true;
+quote_type = auto;
+space_after_anonymous_functions = true;
+space_after_control_statements = true;
+spaces_around_operators = true;
+trim_trailing_whitespace = true;
+spaces_in_brackets = false;
+end_of_line = lf;
+
diff --git a/src/node_modules/is-symbol/.eslintrc b/src/node_modules/is-symbol/.eslintrc
new file mode 100644
index 0000000..046dd07
--- /dev/null
+++ b/src/node_modules/is-symbol/.eslintrc
@@ -0,0 +1,14 @@
+{
+	"root": true,
+
+	"extends": "@ljharb",
+
+	"overrides": [
+		{
+			"files": "test/**",
+			"rules": {
+				"no-restricted-properties": 0,
+			},
+		},
+	],
+}
diff --git a/src/node_modules/is-symbol/.github/FUNDING.yml b/src/node_modules/is-symbol/.github/FUNDING.yml
new file mode 100644
index 0000000..a65600e
--- /dev/null
+++ b/src/node_modules/is-symbol/.github/FUNDING.yml
@@ -0,0 +1,12 @@
+# These are supported funding model platforms
+
+github: [ljharb]
+patreon: # Replace with a single Patreon username
+open_collective: # Replace with a single Open Collective username
+ko_fi: # Replace with a single Ko-fi username
+tidelift: npm/is-symbol
+community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
+liberapay: # Replace with a single Liberapay username
+issuehunt: # Replace with a single IssueHunt username
+otechie: # Replace with a single Otechie username
+custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']
diff --git a/src/node_modules/is-symbol/.github/workflows/rebase.yml b/src/node_modules/is-symbol/.github/workflows/rebase.yml
new file mode 100644
index 0000000..436cb79
--- /dev/null
+++ b/src/node_modules/is-symbol/.github/workflows/rebase.yml
@@ -0,0 +1,15 @@
+name: Automatic Rebase
+
+on: [pull_request]
+
+jobs:
+  _:
+    name: "Automatic Rebase"
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+    - uses: ljharb/rebase@master
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/src/node_modules/is-symbol/.nvmrc b/src/node_modules/is-symbol/.nvmrc
new file mode 100644
index 0000000..64f5a0a
--- /dev/null
+++ b/src/node_modules/is-symbol/.nvmrc
@@ -0,0 +1 @@
+node
diff --git a/src/node_modules/is-symbol/.travis.yml b/src/node_modules/is-symbol/.travis.yml
new file mode 100644
index 0000000..2d1c1d2
--- /dev/null
+++ b/src/node_modules/is-symbol/.travis.yml
@@ -0,0 +1,12 @@
+version: ~> 1.0
+language: node_js
+os:
+ - linux
+import:
+ - ljharb/travis-ci:node/all.yml
+ - ljharb/travis-ci:node/pretest.yml
+ - ljharb/travis-ci:node/posttest.yml
+ - ljharb/travis-ci:node/coverage.yml
+matrix:
+  allow_failures:
+    - env: COVERAGE=true
diff --git a/src/node_modules/is-symbol/CHANGELOG.md b/src/node_modules/is-symbol/CHANGELOG.md
new file mode 100644
index 0000000..6c68c59
--- /dev/null
+++ b/src/node_modules/is-symbol/CHANGELOG.md
@@ -0,0 +1,86 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+Generated by [`auto-changelog`](https://github.com/CookPete/auto-changelog).
+
+## [v1.0.3](https://github.com/inspect-js/is-symbol/compare/v1.0.2...v1.0.3) - 2019-11-21
+
+### Commits
+
+- [Tests] use shared travis-ci configs [`034afdd`](https://github.com/inspect-js/is-symbol/commit/034afdd677c1b72b76751f3e5131acc927a32916)
+- [Tests] remove `jscs` [`0c026a0`](https://github.com/inspect-js/is-symbol/commit/0c026a06815e46a33a8a5b4b1be8965d32d38e5c)
+- [meta] add `auto-changelog` [`9a1776b`](https://github.com/inspect-js/is-symbol/commit/9a1776bb49f3e6ac12a5b3a447edcc651216891b)
+- [Tests] up to `node` `v12.10`, `v11.15`, `v10.16`, `v8.16`, `v6.17` [`23a6db4`](https://github.com/inspect-js/is-symbol/commit/23a6db49a338d19eab19d876745513820bb6a9dc)
+- [Tests] up to `node` `v11.7`, `v10.15`, `v8.15`, `v6.16` [`892d92e`](https://github.com/inspect-js/is-symbol/commit/892d92e7c40f3c0577583a98134106181c38bb7e)
+- [Dev Deps] update `eslint`, `@ljharb/eslint-config`, `safe-publish-latest`, `semver`, `tape` [`c2e6d6a`](https://github.com/inspect-js/is-symbol/commit/c2e6d6a71f839522bbd124b7419f5fc42ffff6d3)
+- [readme] fix repo URLs [`655c288`](https://github.com/inspect-js/is-symbol/commit/655c288a815856e647dba4b6049b1743cec3533c)
+- [actions] add automatic rebasing / merge commit blocking [`97b1229`](https://github.com/inspect-js/is-symbol/commit/97b12296bf8fa1ce0c6121bf3de56c413da10aae)
+- [meta] add FUNDING.yml [`94c64a3`](https://github.com/inspect-js/is-symbol/commit/94c64a367a1c34f960cf6007fc65cfbbcba34ba3)
+- [Dev Deps] update `eslint`, `@ljharb/eslint-config`, `covert`, `tape`, `semver` [`71ab543`](https://github.com/inspect-js/is-symbol/commit/71ab543e09b820378362f4f66248addd410c6388)
+- [Dev Deps] update `eslint`, `@ljharb/eslint-config`, `semver`, `tape` [`c6212f9`](https://github.com/inspect-js/is-symbol/commit/c6212f94e28622c94bb37189ffc241ee88b5b1dd)
+- [Dev Deps] update `eslint`, `@ljharb/eslint-config`, `safe-publish-latest`, `object-inspect` [`91bc802`](https://github.com/inspect-js/is-symbol/commit/91bc802e18e63f4e8230ee0148302ce849e2f733)
+- [Tests] use `npx aud` instead of `nsp` or `npm audit` with hoops [`8cbe69c`](https://github.com/inspect-js/is-symbol/commit/8cbe69c3fafe9cfbe7d27f710c88d02d2d2c6a00)
+- [Tests] use `npm audit` instead of `nsp` [`741b51d`](https://github.com/inspect-js/is-symbol/commit/741b51dac868f6b22736c204910d257bcf4d5044)
+- [meta] add `funding` field [`65b58d1`](https://github.com/inspect-js/is-symbol/commit/65b58d1e9fc572712d462d615e6b2418627d8fb9)
+- [Deps] update `has-symbols` [`9cb5b2a`](https://github.com/inspect-js/is-symbol/commit/9cb5b2a9a3b89e8e0246be8df4fff3f5ceac7309)
+
+## [v1.0.2](https://github.com/inspect-js/is-symbol/compare/v1.0.1...v1.0.2) - 2018-09-20
+
+### Commits
+
+- Update `eslint`, `tape`, `semver`; use my personal shared `eslint` config [`e86aaea`](https://github.com/inspect-js/is-symbol/commit/e86aaea8d81356801ecfc60540523e9b809a55f4)
+- [Tests] on all node minors; improve test matrix [`50bc07f`](https://github.com/inspect-js/is-symbol/commit/50bc07f2ff73e5499b02a61f0a00ea48a84ae213)
+- [Dev Deps] update `tape`, `jscs`, `nsp`, `semver`, `eslint`, `@ljharb/eslint-config` [`45e17bd`](https://github.com/inspect-js/is-symbol/commit/45e17bdf145846f30122348a94c5e506b90836ba)
+- [Tests] up to `node` `v10.0`, `v9.11`, `v8.11`, `v6.14`, `v4.9`; use `nvm install-latest-npm` [`44402cb`](https://github.com/inspect-js/is-symbol/commit/44402cb82d4499e947b48b31b14667d1ebe7e2b4)
+- [Tests] up to `node` `v8.1`, `v7.10`, `v6.11`, `v4.8`; improve matrix; old npm breaks on newer nodes [`9047c23`](https://github.com/inspect-js/is-symbol/commit/9047c232857ecb80551a21cc0b1cc4c91d28da1f)
+- Update `tape`, `covert`, `jscs`, `semver` [`d57d1ce`](https://github.com/inspect-js/is-symbol/commit/d57d1ce3fc0b740885a1ed5c0738d4a27b29ab07)
+- Add `npm run eslint` [`0d75a66`](https://github.com/inspect-js/is-symbol/commit/0d75a6638ad6f7ff7d5bc958531a6328fb13e3fe)
+- Update `eslint` [`042fb3a`](https://github.com/inspect-js/is-symbol/commit/042fb3aec590f0c0d205b15812b285ad95cfff6b)
+- [Refactor] use `has-symbols` and `object-inspect` [`129bc68`](https://github.com/inspect-js/is-symbol/commit/129bc68dd619b789b9956ac9b63b46257ee1060c)
+- [Tests] up to `node` `v10.11`, `v8.12` [`c1822e8`](https://github.com/inspect-js/is-symbol/commit/c1822e84d6cc0cee9f1c2893e91b1aa999ad41db)
+- Update `tape`, `jscs`, `eslint`, `@ljharb/eslint-config` [`089d2cf`](https://github.com/inspect-js/is-symbol/commit/089d2cf7cad87b75aa534769af11524ad2e79080)
+- [Tests] up to `node` `v8.4`; newer npm breaks on older node [`05ce701`](https://github.com/inspect-js/is-symbol/commit/05ce701e3c1be8b3266ffac49806832e410491c1)
+- All grade A-supported `node`/`iojs` versions now ship with an `npm` that understands `^`. [`241e6a6`](https://github.com/inspect-js/is-symbol/commit/241e6a655c0e19e9dcf0ae88e7fddd4cde394c5c)
+- Test on latest `node` and `io.js` versions. [`5c8d5de`](https://github.com/inspect-js/is-symbol/commit/5c8d5deb9b7c01a8cdf959082a3d619c19751b0a)
+- [Dev Deps] update `eslint`, `@ljharb/eslint-config`, `nsp`, `semver`, `tape` [`06047bf`](https://github.com/inspect-js/is-symbol/commit/06047bf72b20a66c0b455e80856b2d00b1910391)
+- [Dev Deps] update `jscs`, `nsp`, `semver`, `eslint`, `@ljharb/eslint-config` [`9d25dd7`](https://github.com/inspect-js/is-symbol/commit/9d25dd79347c89f98207a3bad39f667f1f8a410e)
+- [Tests] up to `io.js` `v3.3`, `node` `v4.1` [`ce173bd`](https://github.com/inspect-js/is-symbol/commit/ce173bda6e146907e3061a0e70463107d955de35)
+- Update `nsp`, `eslint` [`29e5214`](https://github.com/inspect-js/is-symbol/commit/29e52140fac2049b4a32e175787bb3b184a1dd72)
+- Update `semver`, `eslint` [`53be884`](https://github.com/inspect-js/is-symbol/commit/53be884c2811f7a4452581003d9cdaf6f9bddd3c)
+- [Dev Deps] update `eslint`, `nsp`, `semver`, `tape` [`3bd149c`](https://github.com/inspect-js/is-symbol/commit/3bd149c869c099b07104b06c0692755a01f8298c)
+- [Dev Deps] update `jscs` [`69b4231`](https://github.com/inspect-js/is-symbol/commit/69b4231632b170e5ddb350db2f0c59e6cad6f548)
+- Test up to `io.js` `v2.1` [`0b61ac7`](https://github.com/inspect-js/is-symbol/commit/0b61ac7ac4de390296aeefb9395549592ea87da4)
+- [Dev Deps] update `tape` [`5e1b200`](https://github.com/inspect-js/is-symbol/commit/5e1b2008c910bcdabee299a1ac599143ea07c3f9)
+- Only apps should have lockfiles. [`a191ff5`](https://github.com/inspect-js/is-symbol/commit/a191ff5f0320fc16db42fdaa40f0c21d4326255e)
+- [Dev Deps] update `nsp`, `eslint`, `@ljharb/eslint-config` [`97c87ef`](https://github.com/inspect-js/is-symbol/commit/97c87ef52b966f211e231092a54ef6ed05c99a26)
+- Test on `io.js` `v2.2` [`42560e4`](https://github.com/inspect-js/is-symbol/commit/42560e466e17cbbb9fa71c0121f4bbbcf266c887)
+- [Dev Deps] Update `tape`, `eslint` [`149b2f2`](https://github.com/inspect-js/is-symbol/commit/149b2f20bde92b2da12ccfeb8988beb2dc95c37c)
+- [Tests] fix test messages [`28bd1ed`](https://github.com/inspect-js/is-symbol/commit/28bd1eda310590e13ada19cbd718c85c25d8a0c5)
+- Test up to `io.js` `v3.0` [`c0dcc98`](https://github.com/inspect-js/is-symbol/commit/c0dcc98313d17151ec043e5452df306618be865e)
+- `node` now supports Symbols now. [`d1853ad`](https://github.com/inspect-js/is-symbol/commit/d1853adf6369ab9d4c4516bdb032c2e42f52f90a)
+- [Dev Deps] update `tape` [`f7a6575`](https://github.com/inspect-js/is-symbol/commit/f7a6575fbdef13abcc412c63d22b56943ed85969)
+- Switch from vb.teelaun.ch to versionbadg.es for the npm version badge SVG. [`aae9c6a`](https://github.com/inspect-js/is-symbol/commit/aae9c6a724578659976ea74e11ec9fe35608607b)
+- Test on `io.js` `v2.4` [`ab8f449`](https://github.com/inspect-js/is-symbol/commit/ab8f4492115270cc00a479915b02ac1bac75dfed)
+- Test on `io.js` `v2.3` [`58ce871`](https://github.com/inspect-js/is-symbol/commit/58ce871674e857955b333aa057eeecd68b40e988)
+
+## [v1.0.1](https://github.com/inspect-js/is-symbol/compare/v1.0.0...v1.0.1) - 2015-01-26
+
+### Commits
+
+- Correct package description. [`f4d15b9`](https://github.com/inspect-js/is-symbol/commit/f4d15b928b4b754b097a84f7c3ceac73c486aceb)
+
+## v1.0.0 - 2015-01-24
+
+### Commits
+
+- Dotfiles. [`5d9a744`](https://github.com/inspect-js/is-symbol/commit/5d9a7441f724630070e9bd74a995191cafa1064b)
+- Tests. [`8af5663`](https://github.com/inspect-js/is-symbol/commit/8af56631950dcee48b36f517837273193a6ba119)
+- `make release` [`6293446`](https://github.com/inspect-js/is-symbol/commit/629344654a72e7fc8059607d6a86c64b002c3e5d)
+- package.json [`7d4082c`](https://github.com/inspect-js/is-symbol/commit/7d4082ca9502118e70d24f526704d45a1a7f2067)
+- Initial commit [`cbb179f`](https://github.com/inspect-js/is-symbol/commit/cbb179f677bd3dcb56ac5e3f0a7a9af503fd8952)
+- Read me. [`099a775`](https://github.com/inspect-js/is-symbol/commit/099a775e7e751706283ae1cab7a8635c094773a9)
+- Implementation. [`cb51248`](https://github.com/inspect-js/is-symbol/commit/cb51248eedaf55e0b8ad7dacdab179db2d76e96e)
diff --git a/src/node_modules/is-symbol/LICENSE b/src/node_modules/is-symbol/LICENSE
new file mode 100644
index 0000000..b43df44
--- /dev/null
+++ b/src/node_modules/is-symbol/LICENSE
@@ -0,0 +1,22 @@
+The MIT License (MIT)
+
+Copyright (c) 2015 Jordan Harband
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
diff --git a/src/node_modules/is-symbol/Makefile b/src/node_modules/is-symbol/Makefile
new file mode 100644
index 0000000..b9e4fe1
--- /dev/null
+++ b/src/node_modules/is-symbol/Makefile
@@ -0,0 +1,61 @@
+# Since we rely on paths relative to the makefile location, abort if make isn't being run from there.
+$(if $(findstring /,$(MAKEFILE_LIST)),$(error Please only invoke this makefile from the directory it resides in))
+
+	# The files that need updating when incrementing the version number.
+VERSIONED_FILES := *.js *.json README*
+
+
+# Add the local npm packages' bin folder to the PATH, so that `make` can find them, when invoked directly.
+# Note that rather than using `$(npm bin)` the 'node_modules/.bin' path component is hard-coded, so that invocation works even from an environment
+# where npm is (temporarily) unavailable due to having deactivated an nvm instance loaded into the calling shell in order to avoid interference with tests.
+export PATH := $(shell printf '%s' "$$PWD/node_modules/.bin:$$PATH")
+UTILS := semver
+# Make sure that all required utilities can be located.
+UTIL_CHECK := $(or $(shell PATH="$(PATH)" which $(UTILS) >/dev/null && echo 'ok'),$(error Did you forget to run `npm install` after cloning the repo? At least one of the required supporting utilities not found: $(UTILS)))
+
+# Default target (by virtue of being the first non '.'-prefixed in the file).
+.PHONY: _no-target-specified
+_no-target-specified:
+	$(error Please specify the target to make - `make list` shows targets. Alternatively, use `npm test` to run the default tests; `npm run` shows all tests)
+
+# Lists all targets defined in this makefile.
+.PHONY: list
+list:
+	@$(MAKE) -pRrn : -f $(MAKEFILE_LIST) 2>/dev/null | awk -v RS= -F: '/^# File/,/^# Finished Make data base/ {if ($$1 !~ "^[#.]") {print $$1}}' | command grep -v -e '^[^[:alnum:]]' -e '^$@$$command ' | sort
+
+# All-tests target: invokes the specified test suites for ALL shells defined in $(SHELLS).
+.PHONY: test
+test:
+	@npm test
+
+.PHONY: _ensure-tag
+_ensure-tag:
+ifndef TAG
+	$(error Please invoke with `make TAG=<new-version> release`, where <new-version> is either an increment specifier (patch, minor, major, prepatch, preminor, premajor, prerelease), or an explicit major.minor.patch version number)
+endif
+
+CHANGELOG_ERROR = $(error No CHANGELOG specified)
+.PHONY: _ensure-changelog
+_ensure-changelog:
+	@ (git status -sb --porcelain | command grep -E '^( M|[MA] ) CHANGELOG.md' > /dev/null) || (echo no CHANGELOG.md specified && exit 2)
+
+# Ensures that the git workspace is clean.
+.PHONY: _ensure-clean
+_ensure-clean:
+	@[ -z "$$((git status --porcelain --untracked-files=no || echo err) | command grep -v 'CHANGELOG.md')" ] || { echo "Workspace is not clean; please commit changes first." >&2; exit 2; }
+
+# Makes a release; invoke with `make TAG=<versionOrIncrementSpec> release`.
+.PHONY: release
+release: _ensure-tag _ensure-changelog _ensure-clean
+	@old_ver=`git describe --abbrev=0 --tags --match 'v[0-9]*.[0-9]*.[0-9]*'` || { echo "Failed to determine current version." >&2; exit 1; }; old_ver=$${old_ver#v}; \
+	 new_ver=`echo "$(TAG)" | sed 's/^v//'`; new_ver=$${new_ver:-patch}; \
+	 if printf "$$new_ver" | command grep -q '^[0-9]'; then \
+	   semver "$$new_ver" >/dev/null || { echo 'Invalid version number specified: $(TAG) - must be major.minor.patch' >&2; exit 2; }; \
+	   semver -r "> $$old_ver" "$$new_ver" >/dev/null || { echo 'Invalid version number specified: $(TAG) - must be HIGHER than current one.' >&2; exit 2; } \
+	 else \
+	   new_ver=`semver -i "$$new_ver" "$$old_ver"` || { echo 'Invalid version-increment specifier: $(TAG)' >&2; exit 2; } \
+	 fi; \
+	 printf "=== Bumping version **$$old_ver** to **$$new_ver** before committing and tagging:\n=== TYPE 'proceed' TO PROCEED, anything else to abort: " && read response && [ "$$response" = 'proceed' ] || { echo 'Aborted.' >&2; exit 2; };  \
+	 replace "$$old_ver" "$$new_ver" -- $(VERSIONED_FILES) && \
+	 git commit -m "v$$new_ver" $(VERSIONED_FILES) CHANGELOG.md && \
+	 git tag -a -m "v$$new_ver" "v$$new_ver"
diff --git a/src/node_modules/is-symbol/README.md b/src/node_modules/is-symbol/README.md
new file mode 100644
index 0000000..e59d1ce
--- /dev/null
+++ b/src/node_modules/is-symbol/README.md
@@ -0,0 +1,44 @@
+#is-symbol <sup>[![Version Badge][2]][1]</sup>
+
+[![Build Status][3]][4]
+[![dependency status][5]][6]
+[![dev dependency status][7]][8]
+[![License][license-image]][license-url]
+[![Downloads][downloads-image]][downloads-url]
+
+[![npm badge][11]][1]
+
+[![browser support][9]][10]
+
+Is this an ES6 Symbol value?
+
+## Example
+
+```js
+var isSymbol = require('is-symbol');
+assert(!isSymbol(function () {}));
+assert(!isSymbol(null));
+assert(!isSymbol(function* () { yield 42; return Infinity; });
+
+assert(isSymbol(Symbol.iterator));
+assert(isSymbol(Symbol('foo')));
+assert(isSymbol(Symbol.for('foo')));
+assert(isSymbol(Object(Symbol('foo'))));
+```
+
+## Tests
+Simply clone the repo, `npm install`, and run `npm test`
+
+[1]: https://npmjs.org/package/is-symbol
+[2]: http://versionbadg.es/inspect-js/is-symbol.svg
+[3]: https://travis-ci.org/inspect-js/is-symbol.svg
+[4]: https://travis-ci.org/inspect-js/is-symbol
+[5]: https://david-dm.org/inspect-js/is-symbol.svg
+[6]: https://david-dm.org/inspect-js/is-symbol
+[7]: https://david-dm.org/inspect-js/is-symbol/dev-status.svg
+[8]: https://david-dm.org/inspect-js/is-symbol#info=devDependencies
+[11]: https://nodei.co/npm/is-symbol.png?downloads=true&stars=true
+[license-image]: http://img.shields.io/npm/l/is-symbol.svg
+[license-url]: LICENSE
+[downloads-image]: http://img.shields.io/npm/dm/is-symbol.svg
+[downloads-url]: http://npm-stat.com/charts.html?package=is-symbol
diff --git a/src/node_modules/is-symbol/index.js b/src/node_modules/is-symbol/index.js
new file mode 100644
index 0000000..3d653e2
--- /dev/null
+++ b/src/node_modules/is-symbol/index.js
@@ -0,0 +1,35 @@
+'use strict';
+
+var toStr = Object.prototype.toString;
+var hasSymbols = require('has-symbols')();
+
+if (hasSymbols) {
+	var symToStr = Symbol.prototype.toString;
+	var symStringRegex = /^Symbol\(.*\)$/;
+	var isSymbolObject = function isRealSymbolObject(value) {
+		if (typeof value.valueOf() !== 'symbol') {
+			return false;
+		}
+		return symStringRegex.test(symToStr.call(value));
+	};
+
+	module.exports = function isSymbol(value) {
+		if (typeof value === 'symbol') {
+			return true;
+		}
+		if (toStr.call(value) !== '[object Symbol]') {
+			return false;
+		}
+		try {
+			return isSymbolObject(value);
+		} catch (e) {
+			return false;
+		}
+	};
+} else {
+
+	module.exports = function isSymbol(value) {
+		// this environment does not support Symbols.
+		return false && value;
+	};
+}
diff --git a/src/node_modules/is-symbol/package.json b/src/node_modules/is-symbol/package.json
new file mode 100644
index 0000000..a793703
--- /dev/null
+++ b/src/node_modules/is-symbol/package.json
@@ -0,0 +1,76 @@
+{
+	"name": "is-symbol",
+	"version": "1.0.3",
+	"description": "Determine if a value is an ES6 Symbol or not.",
+	"main": "index.js",
+	"scripts": {
+		"prepublish": "safe-publish-latest",
+		"pretest": "npm run lint",
+		"tests-only": "node --es-staging --harmony test",
+		"test": "npm run tests-only",
+		"posttest": "npx aud",
+		"coverage": "covert test",
+		"lint": "eslint .",
+		"version": "auto-changelog && git add CHANGELOG.md",
+		"postversion": "auto-changelog && git add CHANGELOG.md && git commit --no-edit --amend && git tag -f \"v$(node -e \"console.log(require('./package.json').version)\")\""
+	},
+	"repository": {
+		"type": "git",
+		"url": "git://github.com/inspect-js/is-symbol.git"
+	},
+	"keywords": [
+		"symbol",
+		"es6",
+		"is",
+		"Symbol"
+	],
+	"author": "Jordan Harband <ljharb@gmail.com>",
+	"funding": {
+		"url": "https://github.com/sponsors/ljharb"
+	},
+	"license": "MIT",
+	"bugs": {
+		"url": "https://github.com/inspect-js/is-symbol/issues"
+	},
+	"dependencies": {
+		"has-symbols": "^1.0.1"
+	},
+	"devDependencies": {
+		"@ljharb/eslint-config": "^15.0.2",
+		"auto-changelog": "^1.16.2",
+		"covert": "^1.1.1",
+		"eslint": "^6.6.0",
+		"object-inspect": "^1.7.0",
+		"safe-publish-latest": "^1.1.4",
+		"semver": "^6.3.0",
+		"tape": "^4.11.0"
+	},
+	"testling": {
+		"files": "test/index.js",
+		"browsers": [
+			"iexplore/6.0..latest",
+			"firefox/3.0..6.0",
+			"firefox/15.0..latest",
+			"firefox/nightly",
+			"chrome/4.0..10.0",
+			"chrome/20.0..latest",
+			"chrome/canary",
+			"opera/10.0..latest",
+			"opera/next",
+			"safari/4.0..latest",
+			"ipad/6.0..latest",
+			"iphone/6.0..latest",
+			"android-browser/4.2"
+		]
+	},
+	"engines": {
+		"node": ">= 0.4"
+	},
+	"auto-changelog": {
+		"output": "CHANGELOG.md",
+		"template": "keepachangelog",
+		"unreleased": false,
+		"commitLimit": false,
+		"backfillLimit": false
+	}
+}
diff --git a/src/node_modules/is-symbol/test/index.js b/src/node_modules/is-symbol/test/index.js
new file mode 100644
index 0000000..e01f035
--- /dev/null
+++ b/src/node_modules/is-symbol/test/index.js
@@ -0,0 +1,92 @@
+'use strict';
+
+var test = require('tape');
+var isSymbol = require('../index');
+
+var forEach = function (arr, func) {
+	var i;
+	for (i = 0; i < arr.length; ++i) {
+		func(arr[i], i, arr);
+	}
+};
+
+var hasSymbols = require('has-symbols')();
+var inspect = require('object-inspect');
+var debug = function (v, m) { return inspect(v) + ' ' + m; };
+
+test('non-symbol values', function (t) {
+	var nonSymbols = [
+		true,
+		false,
+		Object(true),
+		Object(false),
+		null,
+		undefined,
+		{},
+		[],
+		/a/g,
+		'string',
+		42,
+		new Date(),
+		function () {},
+		NaN
+	];
+	t.plan(nonSymbols.length);
+	forEach(nonSymbols, function (nonSymbol) {
+		t.equal(false, isSymbol(nonSymbol), debug(nonSymbol, 'is not a symbol'));
+	});
+	t.end();
+});
+
+test('faked symbol values', function (t) {
+	t.test('real symbol valueOf', { skip: !hasSymbols }, function (st) {
+		var fakeSymbol = { valueOf: function () { return Symbol('foo'); } };
+		st.equal(false, isSymbol(fakeSymbol), 'object with valueOf returning a symbol is not a symbol');
+		st.end();
+	});
+
+	t.test('faked @@toStringTag', { skip: !hasSymbols || !Symbol.toStringTag }, function (st) {
+		var fakeSymbol = { valueOf: function () { return Symbol('foo'); } };
+		fakeSymbol[Symbol.toStringTag] = 'Symbol';
+		st.equal(false, isSymbol(fakeSymbol), 'object with fake Symbol @@toStringTag and valueOf returning a symbol is not a symbol');
+		var notSoFakeSymbol = { valueOf: function () { return 42; } };
+		notSoFakeSymbol[Symbol.toStringTag] = 'Symbol';
+		st.equal(false, isSymbol(notSoFakeSymbol), 'object with fake Symbol @@toStringTag and valueOf not returning a symbol is not a symbol');
+		st.end();
+	});
+
+	var fakeSymbolString = { toString: function () { return 'Symbol(foo)'; } };
+	t.equal(false, isSymbol(fakeSymbolString), 'object with toString returning Symbol(foo) is not a symbol');
+
+	t.end();
+});
+
+test('Symbol support', { skip: !hasSymbols }, function (t) {
+	t.test('well-known Symbols', function (st) {
+		var isWellKnown = function filterer(name) {
+			return name !== 'for' && name !== 'keyFor' && !(name in filterer);
+		};
+		var wellKnownSymbols = Object.getOwnPropertyNames(Symbol).filter(isWellKnown);
+		wellKnownSymbols.forEach(function (name) {
+			var sym = Symbol[name];
+			st.equal(true, isSymbol(sym), debug(sym, ' is a symbol'));
+		});
+		st.end();
+	});
+
+	t.test('user-created symbols', function (st) {
+		var symbols = [
+			Symbol(),
+			Symbol('foo'),
+			Symbol['for']('foo'),
+			Object(Symbol('object'))
+		];
+		symbols.forEach(function (sym) {
+			st.equal(true, isSymbol(sym), debug(sym, ' is a symbol'));
+		});
+		st.end();
+	});
+
+	t.end();
+});
+