fix: Resolve TypeScript errors

Signed-off-by: Hermes Agent <hermes@nosuchhost>

client/node_modules/level-concat-iterator/.travis.yml

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+sudo: false
+
+language: node_js
+
+node_js:
+  - 6
+  - 8
+  - 10
+
+after_success: npm run coverage

client/node_modules/level-concat-iterator/CHANGELOG.md

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+# Changelog
+
+## [Unreleased][unreleased]
+
+## [2.0.1] - 2019-04-01
+
+### Changed
+
+- Upgrade `standard` devDependency from `^11.0.1` to `^12.0.1` ([`6b957cf`](https://github.com/Level/concat-iterator/commit/6b957cf)) ([**@vweevers**](https://github.com/vweevers))
+- Apply common project tweaks ([#12](https://github.com/Level/concat-iterator/issues/12), [#13](https://github.com/Level/concat-iterator/issues/13), [`0c1d4e0`](https://github.com/Level/concat-iterator/commit/0c1d4e0)) ([**@vweevers**](https://github.com/vweevers))
+
+### Added
+
+- Add `nyc` and `coveralls` ([#11](https://github.com/Level/concat-iterator/issues/11), [`a3e312a`](https://github.com/Level/concat-iterator/commit/a3e312a)) ([**@ralphtheninja**](https://github.com/ralphtheninja), [**@vweevers**](https://github.com/vweevers))
+
+### Removed
+
+- Remove node 9 from travis ([`0347b82`](https://github.com/Level/concat-iterator/commit/0347b82)) ([**@ralphtheninja**](https://github.com/ralphtheninja))
+
+## [2.0.0] - 2018-06-27
+
+### Changed
+
+- Detect end by checking key and value ([**@vweevers**](https://github.com/vweevers))
+- Use `level` in example instead of `leveldown` ([**@ralphtheninja**](https://github.com/ralphtheninja))
+- End iterator if next errors ([**@ralphtheninja**](https://github.com/ralphtheninja))
+
+### Removed
+
+- Remove custom `nextTick` parameter ([**@ralphtheninja**](https://github.com/ralphtheninja))
+
+### Added
+
+- Add `homepage` and `repository` to `package.json` ([**@ralphtheninja**](https://github.com/ralphtheninja))
+- Add `UPGRADING.md` ([**@ralphtheninja**](https://github.com/ralphtheninja))
+
+## 1.0.0 - 2018-06-24
+
+:seedling: Initial release.
+
+[unreleased]: https://github.com/Level/concat-iterator/compare/v2.0.1...HEAD
+
+[2.0.1]: https://github.com/Level/concat-iterator/compare/v2.0.0...v2.0.1
+
+[2.0.0]: https://github.com/Level/concat-iterator/compare/v1.0.0...v2.0.0

client/node_modules/level-concat-iterator/CONTRIBUTORS.md

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+# Contributors
+
+| Name                 | GitHub                                                 | Social                                                     |
+| :------------------- | :----------------------------------------------------- | :--------------------------------------------------------- |
+| **Lars-Magnus Skog** | [**@ralphtheninja**](https://github.com/ralphtheninja) | [**@ralph@social.weho.st**](https://social.weho.st/@ralph) |
+| **Vincent Weevers**  | [**@vweevers**](https://github.com/vweevers)           | [**@vweevers@twitter**](https://twitter.com/vweevers)      |

client/node_modules/level-concat-iterator/LICENSE.md

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+# The MIT License (MIT)
+
+**Copyright © 2018-present [Contributors](CONTRIBUTORS.md).**
+
+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.

client/node_modules/level-concat-iterator/README.md

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+# level-concat-iterator
+
+> Concatenate items from an iterator into an array.
+
+[![level badge][level-badge]](https://github.com/Level/awesome)
+[![npm](https://img.shields.io/npm/v/level-concat-iterator.svg?label=&logo=npm)](https://www.npmjs.com/package/level-concat-iterator)
+[![Node version](https://img.shields.io/node/v/level-concat-iterator.svg)](https://www.npmjs.com/package/level-concat-iterator)
+[![Travis](https://img.shields.io/travis/Level/concat-iterator.svg?logo=travis&label=)](https://travis-ci.org/Level/concat-iterator)
+[![Coverage Status](https://coveralls.io/repos/github/Level/concat-iterator/badge.svg)](https://coveralls.io/github/Level/concat-iterator)
+[![JavaScript Style Guide](https://img.shields.io/badge/code_style-standard-brightgreen.svg)](https://standardjs.com)
+[![npm](https://img.shields.io/npm/dm/level-concat-iterator.svg?label=dl)](https://www.npmjs.com/package/level-concat-iterator)
+[![Backers on Open Collective](https://opencollective.com/level/backers/badge.svg?color=orange)](#backers)
+[![Sponsors on Open Collective](https://opencollective.com/level/sponsors/badge.svg?color=orange)](#sponsors)
+
+## Usage
+
+```js
+var concat = require('level-concat-iterator')
+var level = require('level')
+
+level('DB', function (err, db) {
+  db.put('foo', 'bar', function (err) {
+    concat(db.iterator(), function (err, data) {
+      console.log(data)
+    })
+  })
+})
+```
+
+**If you are upgrading:** please see [`UPGRADING.md`](UPGRADING.md).
+
+## API
+
+### `concat(iterator, cb)`
+
+Takes an `abstract-leveldown` compatible `iterator` as first parameter and calls back with an array of keys and values. Calls back with an error if `iterator.next(cb)` or `iterator.end(cb)` errors.
+
+## Contributing
+
+[`Level/concat-iterator`](https://github.com/Level/concat-iterator) is an **OPEN Open Source Project**. This means that:
+
+> Individuals making significant and valuable contributions are given commit-access to the project to contribute as they see fit. This project is more like an open wiki than a standard guarded open source project.
+
+See the [Contribution Guide](https://github.com/Level/community/blob/master/CONTRIBUTING.md) for more details.
+
+## Donate
+
+To sustain [`Level`](https://github.com/Level) and its activities, become a backer or sponsor on [Open Collective](https://opencollective.com/level). Your logo or avatar will be displayed on our 28+ [GitHub repositories](https://github.com/Level), [npm](https://www.npmjs.com/) packages and (soon) [our website](http://leveldb.org). 💖
+
+### Backers
+
+[![Open Collective backers](https://opencollective.com/level/backers.svg?width=890)](https://opencollective.com/level)
+
+### Sponsors
+
+[![Open Collective sponsors](https://opencollective.com/level/sponsors.svg?width=890)](https://opencollective.com/level)
+
+## License
+
+[MIT](LICENSE.md) © 2018-present [Contributors](CONTRIBUTORS.md).
+
+[level-badge]: http://leveldb.org/img/badge.svg

client/node_modules/level-concat-iterator/UPGRADING.md

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+# Upgrade Guide
+
+This document describes breaking changes and how to upgrade. For a complete list of changes including minor and patch releases, please refer to the [changelog](CHANGELOG.md).
+
+## v2
+
+The `nextTick` parameter was removed.

client/node_modules/level-concat-iterator/example.js

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+var level = require('level')
+var concat = require('.')
+
+level('DB', function (err, db) {
+  if (err) throw err
+  db.put('foo', 'bar', function (err) {
+    if (err) throw err
+    concat(db.iterator(), function (err, data) {
+      if (err) throw err
+      console.log(data)
+    })
+  })
+})

client/node_modules/level-concat-iterator/index.js

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+module.exports = function (iterator, cb) {
+  var data = []
+  var next = function () {
+    iterator.next(function (err, key, value) {
+      if (err || (key === undefined && value === undefined)) {
+        return iterator.end(function (err2) {
+          cb(err || err2, data)
+        })
+      }
+      data.push({ key: key, value: value })
+      next()
+    })
+  }
+  next()
+}

client/node_modules/level-concat-iterator/package.json

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+{
+  "name": "level-concat-iterator",
+  "version": "2.0.1",
+  "description": "Concatenate items from an iterator into an array.",
+  "author": "Lars-Magnus Skog <ralphtheninja@riseup.net>",
+  "license": "MIT",
+  "main": "index.js",
+  "scripts": {
+    "test": "standard && hallmark && nyc node test",
+    "coverage": "nyc report --reporter=text-lcov | coveralls",
+    "hallmark": "hallmark --fix",
+    "dependency-check": "dependency-check . test.js",
+    "prepublishOnly": "npm run dependency-check"
+  },
+  "devDependencies": {
+    "coveralls": "^3.0.2",
+    "dependency-check": "^3.3.0",
+    "hallmark": "^0.1.0",
+    "level-community": "^3.0.0",
+    "nyc": "^13.3.0",
+    "standard": "^12.0.1",
+    "tape": "^4.9.1"
+  },
+  "hallmark": {
+    "community": "level-community"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/Level/concat-iterator.git"
+  },
+  "homepage": "https://github.com/Level/concat-iterator",
+  "keywords": [
+    "level",
+    "concatenate",
+    "iterator",
+    "array"
+  ],
+  "engines": {
+    "node": ">=6"
+  }
+}

client/node_modules/level-concat-iterator/test.js

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+var test = require('tape')
+var collect = require('.')
+
+test('calls back with error if iterator.next errors', function (t) {
+  t.plan(3)
+
+  var iterator = {
+    next: function (cb) {
+      t.pass('iterator.next called')
+      process.nextTick(cb, new Error('iterator.next'))
+    },
+    end: function (cb) {
+      t.pass('iterator.end called')
+      process.nextTick(cb)
+    }
+  }
+
+  collect(iterator, function (err) {
+    t.is(err.message, 'iterator.next', 'correct error')
+  })
+})
+
+test('happy path calls back with an array', function (t) {
+  t.plan(6)
+
+  var i = 0
+  var data = [
+    { key: 'key1', value: 'value1' },
+    { key: 'key2', value: 'value2' }
+  ]
+
+  var iterator = {
+    next: function (cb) {
+      t.pass('iterator.next called')
+      if (i < data.length) {
+        process.nextTick(cb, null, data[i].key, data[i].value)
+        ++i
+      } else {
+        process.nextTick(cb)
+      }
+    },
+    end: function (cb) {
+      t.pass('iterator.end called')
+      process.nextTick(cb)
+    }
+  }
+
+  collect(iterator, function (err, result) {
+    t.error(err, 'no error')
+    t.same(result, data)
+  })
+})
+
+test('calls back with error and data if iterator.end errors', function (t) {
+  t.plan(6)
+
+  var i = 0
+  var data = [
+    { key: 'key1', value: 'value1' },
+    { key: 'key2', value: 'value2' }
+  ]
+
+  var iterator = {
+    next: function (cb) {
+      t.pass('iterator.next called')
+      if (i < data.length) {
+        process.nextTick(cb, null, data[i].key, data[i].value)
+        ++i
+      } else {
+        process.nextTick(cb)
+      }
+    },
+    end: function (cb) {
+      t.pass('iterator.end called')
+      process.nextTick(cb, new Error('iterator.end'))
+    }
+  }
+
+  collect(iterator, function (err, result) {
+    t.is(err.message, 'iterator.end', 'correct error')
+    t.same(result, data)
+  })
+})
+
+test('calls back with error and partial data if iterator.end errors', function (t) {
+  t.plan(5)
+
+  var i = 0
+  var data = [
+    { key: 'key1', value: 'value1' },
+    { key: 'key2', value: 'value2' }
+  ]
+
+  var iterator = {
+    next: function (cb) {
+      t.pass('iterator.next called')
+      if (i === 0) {
+        process.nextTick(cb, null, data[i].key, data[i].value)
+        i++
+      } else {
+        process.nextTick(cb)
+      }
+    },
+    end: function (cb) {
+      t.pass('iterator.end called')
+      process.nextTick(cb, new Error('foo'))
+    }
+  }
+
+  collect(iterator, function (err, result) {
+    t.is(err.message, 'foo', 'correct error')
+    t.same(result, [].concat(data[0]))
+  })
+})