diff --git a/.github/workflows/unit-tests.yml b/.github/workflows/unit-tests.yml
index bbed17d4..b558b4eb 100644
--- a/.github/workflows/unit-tests.yml
+++ b/.github/workflows/unit-tests.yml
@@ -41,6 +41,8 @@ jobs:
 
     - name: npm test
       run: npm test
+      env:
+        GITHUB_TOKEN: ${{ github.token }}
 
     - name: Lint
       run: npm run lint
diff --git a/packages/github/README.md b/packages/github/README.md
index 12c5b0b0..bd5f708b 100644
--- a/packages/github/README.md
+++ b/packages/github/README.md
@@ -4,7 +4,7 @@
 
 ## Usage
 
-Returns an Octokit client. See https://octokit.github.io/rest.js for the API.
+Returns an authenticated Octokit client that follows the machine [proxy settings](https://help.github.com/en/actions/automating-your-workflow-with-github-actions/about-self-hosted-runners#using-a-proxy-server-with-self-hosted-runners). See https://octokit.github.io/rest.js for the API.
 
 ```js
 const github = require('@actions/github');
@@ -34,7 +34,7 @@ async function run() {
 run();
 ```
 
-You can pass client options (except `auth`, which is handled by the token argument), as specified by [Octokit](https://octokit.github.io/rest.js/), as a second argument to the `GitHub` constructor.
+You can pass client options, as specified by [Octokit](https://octokit.github.io/rest.js/), as a second argument to the `GitHub` constructor.
 
 You can also make GraphQL requests. See https://github.com/octokit/graphql.js for the API.
 
diff --git a/packages/github/__tests__/github.test.ts b/packages/github/__tests__/github.test.ts
new file mode 100644
index 00000000..0d530956
--- /dev/null
+++ b/packages/github/__tests__/github.test.ts
@@ -0,0 +1,173 @@
+import * as http from 'http'
+import proxy from 'proxy'
+import {GitHub} from '../src/github'
+
+describe('@actions/github', () => {
+  const proxyUrl = 'http://127.0.0.1:8080'
+  const originalProxyUrl = process.env['https_proxy']
+  let proxyConnects: string[]
+  let proxyServer: http.Server
+  let first = true
+
+  beforeAll(async () => {
+    // Start proxy server
+    proxyServer = proxy() as http.Server
+    await new Promise(resolve => {
+      const port = Number(proxyUrl.split(':')[2])
+      proxyServer.listen(port, () => resolve())
+    })
+    proxyServer.on('connect', req => {
+      proxyConnects.push(req.url)
+    })
+  })
+
+  beforeEach(() => {
+    delete process.env['https_proxy']
+    proxyConnects = []
+  })
+
+  afterAll(async () => {
+    // Stop proxy server
+    await new Promise(resolve => {
+      proxyServer.once('close', () => resolve())
+      proxyServer.close()
+    })
+
+    if (originalProxyUrl) {
+      process.env['https_proxy'] = originalProxyUrl
+    }
+  })
+
+  it('basic REST client', async () => {
+    const token = getToken()
+    if (!token) {
+      return
+    }
+
+    const octokit = new GitHub(token)
+    const branch = await octokit.repos.getBranch({
+      owner: 'actions',
+      repo: 'toolkit',
+      branch: 'master'
+    })
+    expect(branch.data.name).toBe('master')
+    expect(proxyConnects).toHaveLength(0)
+  })
+
+  it('basic REST client with custom auth', async () => {
+    const token = getToken()
+    if (!token) {
+      return
+    }
+
+    // Valid token
+    let octokit = new GitHub({auth: `token ${token}`})
+    const branch = await octokit.repos.getBranch({
+      owner: 'actions',
+      repo: 'toolkit',
+      branch: 'master'
+    })
+    expect(branch.data.name).toBe('master')
+    expect(proxyConnects).toHaveLength(0)
+
+    // Invalid token
+    octokit = new GitHub({auth: `token asdf`})
+    let failed = false
+    try {
+      await octokit.repos.getBranch({
+        owner: 'actions',
+        repo: 'toolkit',
+        branch: 'master'
+      })
+    } catch (err) {
+      failed = true
+    }
+    expect(failed).toBeTruthy()
+  })
+
+  it('basic REST client with proxy', async () => {
+    const token = getToken()
+    if (!token) {
+      return
+    }
+
+    process.env['https_proxy'] = proxyUrl
+    const octokit = new GitHub(token)
+    const branch = await octokit.repos.getBranch({
+      owner: 'actions',
+      repo: 'toolkit',
+      branch: 'master'
+    })
+    expect(branch.data.name).toBe('master')
+    expect(proxyConnects).toEqual(['api.github.com:443'])
+  })
+
+  it('basic GraphQL client', async () => {
+    const token = getToken()
+    if (!token) {
+      return
+    }
+
+    const octokit = new GitHub(token)
+    const repository = await octokit.graphql(
+      '{repository(owner:"actions", name:"toolkit"){name}}'
+    )
+    expect(repository).toEqual({repository: {name: 'toolkit'}})
+    expect(proxyConnects).toHaveLength(0)
+  })
+
+  it('basic GraphQL client with custom auth', async () => {
+    const token = getToken()
+    if (!token) {
+      return
+    }
+
+    // Valid token
+    let octokit = new GitHub(token)
+    const repository = await octokit.graphql(
+      '{repository(owner:"actions", name:"toolkit"){name}}'
+    )
+    expect(repository).toEqual({repository: {name: 'toolkit'}})
+    expect(proxyConnects).toHaveLength(0)
+
+    // Invalid token
+    octokit = new GitHub({auth: `token asdf`})
+    let failed = false
+    try {
+      await octokit.graphql(
+        '{repository(owner:"actions", name:"toolkit"){name}}'
+      )
+    } catch (err) {
+      failed = true
+    }
+    expect(failed).toBeTruthy()
+  })
+
+  it('basic GraphQL client with proxy', async () => {
+    const token = getToken()
+    if (!token) {
+      return
+    }
+
+    process.env['https_proxy'] = proxyUrl
+    const octokit = new GitHub(token)
+    const repository = await octokit.graphql(
+      '{repository(owner:"actions", name:"toolkit"){name}}'
+    )
+    expect(repository).toEqual({repository: {name: 'toolkit'}})
+    expect(proxyConnects).toEqual(['api.github.com:443'])
+  })
+
+  function getToken(): string {
+    const token = process.env['GITHUB_TOKEN'] || ''
+    if (!token && first) {
+      /* eslint-disable-next-line no-console */
+      console.warn(
+        'Skipping GitHub tests. Set $GITHUB_TOKEN to run REST client and GraphQL client tests'
+      )
+      first = false
+    }
+
+    return token
+  }
+})
diff --git a/packages/github/__tests__/proxy.d.ts b/packages/github/__tests__/proxy.d.ts
new file mode 100644
index 00000000..9b61127b
--- /dev/null
+++ b/packages/github/__tests__/proxy.d.ts
@@ -0,0 +1,5 @@
+declare module 'proxy' {
+  import * as http from 'http'
+  function internal(): http.Server
+  export = internal
+}
diff --git a/packages/github/package-lock.json b/packages/github/package-lock.json
index c2ac4ab0..983f083d 100644
--- a/packages/github/package-lock.json
+++ b/packages/github/package-lock.json
@@ -1,9 +1,17 @@
 {
   "name": "@actions/github",
-  "version": "2.0.1",
+  "version": "2.0.2",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "@actions/http-client": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-1.0.2.tgz",
+      "integrity": "sha512-ngdGx7aXM7i9BFT+7e3RWWAEt3bX4tKrdI5w5hf0wYpHz66u5Nw6AFSFXG5wzQyUQbkgeNRnJZyK2zciGqXgrQ==",
+      "requires": {
+        "tunnel": "0.0.6"
+      }
+    },
     "@babel/code-frame": {
       "version": "7.5.5",
       "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.5.5.tgz",
@@ -686,6 +694,67 @@
         "normalize-path": "^2.1.1"
       }
     },
+    "args": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/args/-/args-3.0.2.tgz",
+      "integrity": "sha1-hQu46IHzE5IDpeTLF2QxCStWLC0=",
+      "dev": true,
+      "requires": {
+        "camelcase": "4.1.0",
+        "chalk": "1.1.3",
+        "minimist": "1.2.0",
+        "pkginfo": "0.4.0",
+        "string-similarity": "1.1.0"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+          "dev": true
+        },
+        "ansi-styles": {
+          "version": "2.2.1",
+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
+          "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
+          "dev": true
+        },
+        "camelcase": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-4.1.0.tgz",
+          "integrity": "sha1-1UVjW+HjPFQmScaRc+Xeas+uNN0=",
+          "dev": true
+        },
+        "chalk": {
+          "version": "1.1.3",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+          "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^2.2.1",
+            "escape-string-regexp": "^1.0.2",
+            "has-ansi": "^2.0.0",
+            "strip-ansi": "^3.0.0",
+            "supports-color": "^2.0.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "3.0.1",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^2.0.0"
+          }
+        },
+        "supports-color": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
+          "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
+          "dev": true
+        }
+      }
+    },
     "arr-diff": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-4.0.0.tgz",
@@ -886,6 +955,12 @@
         }
       }
     },
+    "basic-auth-parser": {
+      "version": "0.0.2",
+      "resolved": "https://registry.npmjs.org/basic-auth-parser/-/basic-auth-parser-0.0.2.tgz",
+      "integrity": "sha1-zp5xp38jwSee7NJlmypGJEwVbkE=",
+      "dev": true
+    },
     "bcrypt-pbkdf": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.2.tgz",
@@ -2401,6 +2476,23 @@
         "function-bind": "^1.1.1"
       }
     },
+    "has-ansi": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/has-ansi/-/has-ansi-2.0.0.tgz",
+      "integrity": "sha1-NPUEnOHs3ysGSa8+8k5F7TVBbZE=",
+      "dev": true,
+      "requires": {
+        "ansi-regex": "^2.0.0"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+          "dev": true
+        }
+      }
+    },
     "has-flag": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
@@ -4046,6 +4138,12 @@
         "find-up": "^3.0.0"
       }
     },
+    "pkginfo": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/pkginfo/-/pkginfo-0.4.0.tgz",
+      "integrity": "sha1-NJ27f/04CB/K3AhT32h/DHdEzWU=",
+      "dev": true
+    },
     "pn": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/pn/-/pn-1.1.0.tgz",
@@ -4092,6 +4190,34 @@
         "sisteransi": "^1.0.0"
       }
     },
+    "proxy": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/proxy/-/proxy-1.0.1.tgz",
+      "integrity": "sha512-mM9Hl6Mbw2Iiw4WLzjtPObtxX3xdsv0Fr07Kqm+GXg0eVObKBD7mc+TMQwkv2zztk5EtyLdv0+eFNXhBfPiU8A==",
+      "dev": true,
+      "requires": {
+        "args": "3.0.2",
+        "basic-auth-parser": "0.0.2",
+        "debug": "^4.1.1"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
+          "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
+          "dev": true,
+          "requires": {
+            "ms": "^2.1.1"
+          }
+        },
+        "ms": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
+          "dev": true
+        }
+      }
+    },
     "psl": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/psl/-/psl-1.2.0.tgz",
@@ -4728,6 +4854,15 @@
         }
       }
     },
+    "string-similarity": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/string-similarity/-/string-similarity-1.1.0.tgz",
+      "integrity": "sha1-PGZJiFikZex8QMfYFzm72ZWQSRQ=",
+      "dev": true,
+      "requires": {
+        "lodash": "^4.13.1"
+      }
+    },
     "string-width": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-2.1.1.tgz",
@@ -4896,6 +5031,11 @@
       "integrity": "sha1-yy4SAwZ+DI3h9hQJS5/kVwTqYAM=",
       "dev": true
     },
+    "tunnel": {
+      "version": "0.0.6",
+      "resolved": "https://registry.npmjs.org/tunnel/-/tunnel-0.0.6.tgz",
+      "integrity": "sha512-1h/Lnq9yajKY2PEbBadPXj3VxsDDu844OnaAo52UVmIzIvwwtBPIuNvkjuzBlTWpfJyUbG3ez0KSBibQkj4ojg=="
+    },
     "tunnel-agent": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
diff --git a/packages/github/package.json b/packages/github/package.json
index d3942b73..5733b170 100644
--- a/packages/github/package.json
+++ b/packages/github/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@actions/github",
-  "version": "2.0.1",
+  "version": "2.0.2",
   "description": "Actions github lib",
   "keywords": [
     "github",
@@ -37,10 +37,12 @@
     "url": "https://github.com/actions/toolkit/issues"
   },
   "dependencies": {
+    "@actions/http-client": "^1.0.2",
     "@octokit/graphql": "^4.3.1",
     "@octokit/rest": "^16.15.0"
   },
   "devDependencies": {
-    "jest": "^24.7.1"
+    "jest": "^24.7.1",
+    "proxy": "^1.0.1"
   }
 }
diff --git a/packages/github/src/github.ts b/packages/github/src/github.ts
index fdf19f1c..e07790f1 100644
--- a/packages/github/src/github.ts
+++ b/packages/github/src/github.ts
@@ -4,10 +4,15 @@ import {graphql} from '@octokit/graphql'
 // we need this type to set up a property on the GitHub object
 // that has token authorization
 // (it is not exported from octokit by default)
-import {graphql as GraphQL} from '@octokit/graphql/dist-types/types'
+import {
+  graphql as GraphQL,
+  RequestParameters as GraphQLRequestParameters
+} from '@octokit/graphql/dist-types/types'
 
 import Octokit from '@octokit/rest'
 import * as Context from './context'
+import * as http from 'http'
+import {HttpClient} from '@actions/http-client'
 
 // We need this in order to extend Octokit
 Octokit.prototype = new Octokit()
@@ -17,11 +22,113 @@ export const context = new Context.Context()
 export class GitHub extends Octokit {
   graphql: GraphQL
 
-  constructor(token: string, opts: Omit<Octokit.Options, 'auth'> = {}) {
-    super({...opts, auth: `token ${token}`})
+  /* eslint-disable no-dupe-class-members */
+  // Disable no-dupe-class-members due to false positive for method overload
+  // https://github.com/typescript-eslint/typescript-eslint/issues/291
 
-    this.graphql = graphql.defaults({
-      headers: {authorization: `token ${token}`}
-    })
+  /**
+   * Sets up the REST client and GraphQL client with auth and proxy support.
+   * The parameter `token` or `opts.auth` must be supplied. The GraphQL client
+   * authorization is not setup when `opts.auth` is a function or object.
+   *
+   * @param token  Auth token
+   * @param opts   Octokit options
+   */
+  constructor(token: string, opts?: Omit<Octokit.Options, 'auth'>)
+  constructor(opts: Octokit.Options)
+  constructor(token: string | Octokit.Options, opts?: Octokit.Options) {
+    super(GitHub.getOctokitOptions(GitHub.disambiguate(token, opts)))
+
+    this.graphql = GitHub.getGraphQL(GitHub.disambiguate(token, opts))
+  }
+
+  /**
+   * Disambiguates the constructor overload parameters
+   */
+  private static disambiguate(
+    token: string | Octokit.Options,
+    opts?: Octokit.Options
+  ): [string, Octokit.Options] {
+    return [
+      typeof token === 'string' ? token : '',
+      typeof token === 'object' ? token : opts || {}
+    ]
+  }
+
+  private static getOctokitOptions(
+    args: [string, Octokit.Options]
+  ): Octokit.Options {
+    const token = args[0]
+    const options = {...args[1]} // Shallow clone - don't mutate the object provided by the caller
+
+    // Auth
+    const auth = GitHub.getAuthString(token, options)
+    if (auth) {
+      options.auth = auth
+    }
+
+    // Proxy
+    const agent = GitHub.getProxyAgent(options)
+    if (agent) {
+      // Shallow clone - don't mutate the object provided by the caller
+      options.request = options.request ? {...options.request} : {}
+
+      // Set the agent
+      options.request.agent = agent
+    }
+
+    return options
+  }
+
+  private static getGraphQL(args: [string, Octokit.Options]): GraphQL {
+    const defaults: GraphQLRequestParameters = {}
+    const token = args[0]
+    const options = args[1]
+
+    // Authorization
+    const auth = this.getAuthString(token, options)
+    if (auth) {
+      defaults.headers = {
+        authorization: auth
+      }
+    }
+
+    // Proxy
+    const agent = GitHub.getProxyAgent(options)
+    if (agent) {
+      defaults.request = {agent}
+    }
+
+    return graphql.defaults(defaults)
+  }
+
+  private static getAuthString(
+    token: string,
+    options: Octokit.Options
+  ): string | undefined {
+    // Validate args
+    if (!token && !options.auth) {
+      throw new Error('Parameter token or opts.auth is required')
+    } else if (token && options.auth) {
+      throw new Error(
+        'Parameters token and opts.auth may not both be specified'
+      )
+    }
+
+    return typeof options.auth === 'string' ? options.auth : `token ${token}`
+  }
+
+  private static getProxyAgent(
+    options: Octokit.Options
+  ): http.Agent | undefined {
+    if (!options.request?.agent) {
+      const proxyUrl = process.env['https_proxy'] || process.env['HTTPS_PROXY']
+      if (proxyUrl) {
+        const httpClient = new HttpClient()
+        return httpClient.getAgent('https://api.github.com')
+      }
+    }
+
+    return undefined
   }
 }
diff --git a/packages/github/tsconfig.json b/packages/github/tsconfig.json
index d68a7710..a8b812a6 100644
--- a/packages/github/tsconfig.json
+++ b/packages/github/tsconfig.json
@@ -2,7 +2,6 @@
   "extends": "../../tsconfig.json",
   "compilerOptions": {
     "baseUrl": "./",
-    "esModuleInterop": true,
     "outDir": "./lib",
     "rootDir": "./src"
   },
diff --git a/packages/glob/__tests__/internal-pattern.test.ts b/packages/glob/__tests__/internal-pattern.test.ts
index c6a1b2c8..5a2fbcc3 100644
--- a/packages/glob/__tests__/internal-pattern.test.ts
+++ b/packages/glob/__tests__/internal-pattern.test.ts
@@ -1,17 +1,9 @@
 import * as io from '../../io/src/io'
+import * as os from 'os'
 import * as path from 'path'
 import {MatchKind} from '../src/internal-match-kind'
 import {promises as fs} from 'fs'
-
-// Mock 'os' before importing Pattern
-/* eslint-disable import/first */
-/* eslint-disable @typescript-eslint/promise-function-async */
-// Note, @typescript-eslint/promise-function-async is a false positive due to the
-// mock factory delegate which returns any. Fixed in a future version of jest.
-jest.mock('os', () => jest.requireActual('os'))
-const os = jest.requireMock('os')
 import {Pattern} from '../src/internal-pattern'
-jest.resetModuleRegistry()
 
 const IS_WINDOWS = process.platform === 'win32'
 
@@ -32,19 +24,13 @@ describe('pattern', () => {
   })
 
   it('escapes homedir', async () => {
-    const originalHomedir = os.homedir
     const home = path.join(getTestTemp(), 'home-with-[and]')
     await fs.mkdir(home, {recursive: true})
-    try {
-      os.homedir = () => home
-      const pattern = new Pattern('~/m*')
+    const pattern = new Pattern('~/m*', undefined, home)
 
-      expect(pattern.searchPath).toBe(home)
-      expect(pattern.match(path.join(home, 'match'))).toBeTruthy()
-      expect(pattern.match(path.join(home, 'not-match'))).toBeFalsy()
-    } finally {
-      os.homedir = originalHomedir
-    }
+    expect(pattern.searchPath).toBe(home)
+    expect(pattern.match(path.join(home, 'match'))).toBeTruthy()
+    expect(pattern.match(path.join(home, 'not-match'))).toBeFalsy()
   })
 
   it('escapes root', async () => {
diff --git a/packages/glob/package-lock.json b/packages/glob/package-lock.json
index 043765ec..3eb24c1b 100644
--- a/packages/glob/package-lock.json
+++ b/packages/glob/package-lock.json
@@ -4,11 +4,6 @@
 	"lockfileVersion": 1,
 	"requires": true,
 	"dependencies": {
-		"@actions/core": {
-			"version": "1.2.1",
-			"resolved": "https://registry.npmjs.org/@actions/core/-/core-1.2.1.tgz",
-			"integrity": "sha512-xD+CQd9p4lU7ZfRqmUcbJpqR+Ss51rJRVeXMyOLrZQImN9/8Sy/BEUBnHO/UKD3z03R686PVTLfEPmkropGuLw=="
-		},
 		"balanced-match": {
 			"version": "1.0.0",
 			"resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
diff --git a/packages/glob/src/internal-path-helper.ts b/packages/glob/src/internal-path-helper.ts
index 7d9d0ef4..0931bd2c 100644
--- a/packages/glob/src/internal-path-helper.ts
+++ b/packages/glob/src/internal-path-helper.ts
@@ -1,5 +1,5 @@
-import * as assert from 'assert'
 import * as path from 'path'
+import assert from 'assert'
 
 const IS_WINDOWS = process.platform === 'win32'
 
diff --git a/packages/glob/src/internal-path.ts b/packages/glob/src/internal-path.ts
index 789cb118..47001d5a 100644
--- a/packages/glob/src/internal-path.ts
+++ b/packages/glob/src/internal-path.ts
@@ -1,6 +1,6 @@
-import * as assert from 'assert'
 import * as path from 'path'
 import * as pathHelper from './internal-path-helper'
+import assert from 'assert'
 
 const IS_WINDOWS = process.platform === 'win32'
 
diff --git a/packages/glob/src/internal-pattern.ts b/packages/glob/src/internal-pattern.ts
index 2735ca73..348acca8 100644
--- a/packages/glob/src/internal-pattern.ts
+++ b/packages/glob/src/internal-pattern.ts
@@ -1,7 +1,7 @@
-import * as assert from 'assert'
 import * as os from 'os'
 import * as path from 'path'
 import * as pathHelper from './internal-path-helper'
+import assert from 'assert'
 import {Minimatch, IMinimatch, IOptions as IMinimatchOptions} from 'minimatch'
 import {MatchKind} from './internal-match-kind'
 import {Path} from './internal-path'
@@ -48,8 +48,13 @@ export class Pattern {
   // https://github.com/typescript-eslint/typescript-eslint/issues/291
 
   constructor(pattern: string)
+  constructor(pattern: string, segments: undefined, homedir: string)
   constructor(negate: boolean, segments: string[])
-  constructor(patternOrNegate: string | boolean, segments?: string[]) {
+  constructor(
+    patternOrNegate: string | boolean,
+    segments?: string[],
+    homedir?: string
+  ) {
     // Pattern overload
     let pattern: string
     if (typeof patternOrNegate === 'string') {
@@ -78,7 +83,7 @@ export class Pattern {
     }
 
     // Normalize slashes and ensures absolute root
-    pattern = Pattern.fixupPattern(pattern)
+    pattern = Pattern.fixupPattern(pattern, homedir)
 
     // Segments
     this.segments = new Path(pattern).segments
@@ -177,7 +182,7 @@ export class Pattern {
   /**
    * Normalizes slashes and ensures absolute root
    */
-  private static fixupPattern(pattern: string): string {
+  private static fixupPattern(pattern: string, homedir?: string): string {
     // Empty
     assert(pattern, 'pattern cannot be empty')
 
@@ -206,7 +211,7 @@ export class Pattern {
     }
     // Replace leading `~` segment
     else if (pattern === '~' || pattern.startsWith(`~${path.sep}`)) {
-      const homedir = os.homedir()
+      homedir = homedir || os.homedir()
       assert(homedir, 'Unable to determine HOME directory')
       assert(
         pathHelper.hasAbsoluteRoot(homedir),
diff --git a/packages/tool-cache/__tests__/tool-cache.test.ts b/packages/tool-cache/__tests__/tool-cache.test.ts
index 543280a5..a2890085 100644
--- a/packages/tool-cache/__tests__/tool-cache.test.ts
+++ b/packages/tool-cache/__tests__/tool-cache.test.ts
@@ -1,8 +1,8 @@
 import * as fs from 'fs'
-import * as nock from 'nock'
 import * as path from 'path'
 import * as io from '@actions/io'
 import * as exec from '@actions/exec'
+import nock from 'nock'
 
 const cachePath = path.join(__dirname, 'CACHE')
 const tempPath = path.join(__dirname, 'TEMP')
diff --git a/packages/tool-cache/package-lock.json b/packages/tool-cache/package-lock.json
index 2ec8bf90..129e3dfa 100644
--- a/packages/tool-cache/package-lock.json
+++ b/packages/tool-cache/package-lock.json
@@ -1,31 +1,16 @@
 {
 	"name": "@actions/tool-cache",
-	"version": "1.3.0",
+	"version": "1.3.1",
 	"lockfileVersion": 1,
 	"requires": true,
 	"dependencies": {
-		"@actions/core": {
-			"version": "1.2.1",
-			"resolved": "https://registry.npmjs.org/@actions/core/-/core-1.2.1.tgz",
-			"integrity": "sha512-xD+CQd9p4lU7ZfRqmUcbJpqR+Ss51rJRVeXMyOLrZQImN9/8Sy/BEUBnHO/UKD3z03R686PVTLfEPmkropGuLw=="
-		},
-		"@actions/exec": {
-			"version": "1.0.3",
-			"resolved": "https://registry.npmjs.org/@actions/exec/-/exec-1.0.3.tgz",
-			"integrity": "sha512-TogJGnueOmM7ntCi0ASTUj4LapRRtDfj57Ja4IhPmg2fls28uVOPbAn8N+JifaOumN2UG3oEO/Ixek2A4NcYSA==",
-			"requires": {
-				"@actions/io": "^1.0.1"
-			}
-		},
 		"@actions/http-client": {
-			"version": "1.0.1",
-			"resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-1.0.1.tgz",
-			"integrity": "sha512-vy5DhqTJ1gtEkpRrD/6BHhUlkeyccrOX0BT9KmtO5TWxe5KSSwVHFE+J15Z0dG+tJwZJ/nHC4slUIyqpkahoMg=="
-		},
-		"@actions/io": {
 			"version": "1.0.2",
-			"resolved": "https://registry.npmjs.org/@actions/io/-/io-1.0.2.tgz",
-			"integrity": "sha512-J8KuFqVPr3p6U8W93DOXlXW6zFvrQAJANdS+vw0YhusLIq+bszW8zmK2Fh1C2kDPX8FMvwIl1OUcFgvJoXLbAg=="
+			"resolved": "https://registry.npmjs.org/@actions/http-client/-/http-client-1.0.2.tgz",
+			"integrity": "sha512-ngdGx7aXM7i9BFT+7e3RWWAEt3bX4tKrdI5w5hf0wYpHz66u5Nw6AFSFXG5wzQyUQbkgeNRnJZyK2zciGqXgrQ==",
+			"requires": {
+				"tunnel": "0.0.6"
+			}
 		},
 		"@types/nock": {
 			"version": "10.0.3",
@@ -194,6 +179,11 @@
 			"resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
 			"integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw=="
 		},
+		"tunnel": {
+			"version": "0.0.6",
+			"resolved": "https://registry.npmjs.org/tunnel/-/tunnel-0.0.6.tgz",
+			"integrity": "sha512-1h/Lnq9yajKY2PEbBadPXj3VxsDDu844OnaAo52UVmIzIvwwtBPIuNvkjuzBlTWpfJyUbG3ez0KSBibQkj4ojg=="
+		},
 		"type-detect": {
 			"version": "4.0.8",
 			"resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.8.tgz",
diff --git a/packages/tool-cache/package.json b/packages/tool-cache/package.json
index 990c5d85..a9d10451 100644
--- a/packages/tool-cache/package.json
+++ b/packages/tool-cache/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@actions/tool-cache",
-  "version": "1.3.0",
+  "version": "1.3.1",
   "description": "Actions tool-cache lib",
   "keywords": [
     "github",
@@ -38,7 +38,7 @@
   "dependencies": {
     "@actions/core": "^1.2.0",
     "@actions/exec": "^1.0.0",
-    "@actions/http-client": "^1.0.1",
+    "@actions/http-client": "^1.0.2",
     "@actions/io": "^1.0.1",
     "semver": "^6.1.0",
     "uuid": "^3.3.2"
diff --git a/packages/tool-cache/src/tool-cache.ts b/packages/tool-cache/src/tool-cache.ts
index b91cf1ad..6e8c6c2a 100644
--- a/packages/tool-cache/src/tool-cache.ts
+++ b/packages/tool-cache/src/tool-cache.ts
@@ -5,7 +5,7 @@ import * as os from 'os'
 import * as path from 'path'
 import * as httpm from '@actions/http-client'
 import * as semver from 'semver'
-import * as uuidV4 from 'uuid/v4'
+import uuidV4 from 'uuid/v4'
 import {exec} from '@actions/exec/lib/exec'
 import {ExecOptions} from '@actions/exec/lib/interfaces'
 import {ok} from 'assert'
diff --git a/tsconfig.json b/tsconfig.json
index 80c954ed..a69cbc2e 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,5 +1,6 @@
 {
   "compilerOptions": {
+    "esModuleInterop": true,
     "module": "commonjs",
     "strict": true,
     "declaration": true,