From 2be7f3f7ad78cd9ac3966762bd24325b8168a4ca Mon Sep 17 00:00:00 2001
From: David Sheldrick <d.j.sheldrick@gmail.com>
Date: Sun, 28 Feb 2021 14:22:21 +0000
Subject: [PATCH] add create-issue feature

---
 README.md                                     |   5 +
 .../__snapshots__/create-issue.test.ts.snap   |  62 ++++
 .../create-issue/create-issue.sh              |  20 ++
 .../create-issue/create-issue.test.ts         |   5 +
 integration-tests/create-issue/open.mock.js   |   7 +
 integration-tests/create-issue/package.json   |  13 +
 integration-tests/create-issue/yarn.lock      | 264 ++++++++++++++++++
 .../__snapshots__/happy-path-npm.test.ts.snap |   5 +
 .../happy-path-yarn.test.ts.snap              |   5 +
 ...res-scripts-when-making-patch.test.ts.snap |   1 +
 .../__snapshots__/lerna-canary.test.ts.snap   |   5 +
 .../nested-packages.test.ts.snap              |   5 +
 .../nested-scoped-packages.test.ts.snap       |   5 +
 package.json                                  |   3 +-
 src/createIssue.ts                            | 104 +++++++
 src/index.ts                                  |   8 +
 src/makePatch.ts                              |  40 ++-
 yarn.lock                                     |  10 +-
 18 files changed, 555 insertions(+), 12 deletions(-)
 create mode 100644 integration-tests/create-issue/__snapshots__/create-issue.test.ts.snap
 create mode 100755 integration-tests/create-issue/create-issue.sh
 create mode 100644 integration-tests/create-issue/create-issue.test.ts
 create mode 100644 integration-tests/create-issue/open.mock.js
 create mode 100644 integration-tests/create-issue/package.json
 create mode 100644 integration-tests/create-issue/yarn.lock
 create mode 100644 src/createIssue.ts

diff --git a/README.md b/README.md
index 49761623..ba3bae74 100644
--- a/README.md
+++ b/README.md
@@ -106,6 +106,11 @@ team.
 
 #### Options
 
+- `--create-issue`
+
+  For packages whose source is hosted on GitHub this option opens a web browser
+  with a draft issue based on your diff.
+
 - `--use-yarn`
 
   By default, patch-package checks whether you use npm or yarn based on which
diff --git a/integration-tests/create-issue/__snapshots__/create-issue.test.ts.snap b/integration-tests/create-issue/__snapshots__/create-issue.test.ts.snap
new file mode 100644
index 00000000..8766cb6f
--- /dev/null
+++ b/integration-tests/create-issue/__snapshots__/create-issue.test.ts.snap
@@ -0,0 +1,62 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Test create-issue: patching left-pad prompts to submit an issue 1`] = `
+"SNAPSHOT: patching left-pad prompts to submit an issue
+patch-package 0.0.0
+• Creating temporary folder
+• Installing left-pad@1.3.0 with yarn
+• Diffing your files with clean files
+✔ Created file patches/left-pad+1.3.0.patch
+
+💡 left-pad is on GitHub! To draft an issue based on your patch run
+
+    yarn patch-package left-pad --create-issue
+
+END SNAPSHOT"
+`;
+
+exports[`Test create-issue: patching left-pad with --create-issue opens the url 1`] = `
+"SNAPSHOT: patching left-pad with --create-issue opens the url
+patch-package 0.0.0
+• Creating temporary folder
+• Installing left-pad@1.3.0 with yarn
+• Diffing your files with clean files
+✔ Created file patches/left-pad+1.3.0.patch
+
+MOCK opening https://github.com/stevemao/left-pad/issues/new
+MOCK title [Replace me]
+MOCK body Hi! 👋 
+      
+Firstly, thanks for your work on this project! 🙂
+
+Today I used [patch-package](https://github.com/ds300/patch-package) to patch \`left-pad\` for the project I'm working on because [Insert reason here].
+
+Here is the diff that solved my problem:
+
+\`\`\`diff
+diff --git a/node_modules/left-pad/index.js b/node_modules/left-pad/index.js
+index e90aec3..cbca95b 100644
+--- a/node_modules/left-pad/index.js
++++ b/node_modules/left-pad/index.js
+@@ -4,7 +4,7 @@
+      * To Public License, Version 2, as published by Sam Hocevar. See
+      * http://www.wtfpl.net/ for more details. */
+ 'use strict';
+-module.exports = leftPad;
++module.exports = patch-package;
+ 
+ var cache = [
+   '',
+@@ -19,7 +19,7 @@ var cache = [
+   '         '
+ ];
+ 
+-function leftPad (str, len, ch) {
++function patch-package (str, len, ch) {
+   // convert \`str\` to a \`string\`
+   str = str + '';
+   // \`len\` is the \`pad\`'s length now
+\`\`\`
+
+END SNAPSHOT"
+`;
diff --git a/integration-tests/create-issue/create-issue.sh b/integration-tests/create-issue/create-issue.sh
new file mode 100755
index 00000000..884162ca
--- /dev/null
+++ b/integration-tests/create-issue/create-issue.sh
@@ -0,0 +1,20 @@
+# make sure errors stop the script
+set -e
+
+echo "add patch-package"
+yarn add $1
+alias patch-package=./node_modules/.bin/patch-package
+
+echo "modify left-pad"
+npx replace leftPad patch-package node_modules/left-pad/index.js
+
+echo "SNAPSHOT: patching left-pad prompts to submit an issue"
+patch-package left-pad
+echo "END SNAPSHOT"
+
+echo "mock open"
+cp open.mock.js node_modules/open/index.js
+
+echo "SNAPSHOT: patching left-pad with --create-issue opens the url"
+patch-package left-pad --create-issue
+echo "END SNAPSHOT"
diff --git a/integration-tests/create-issue/create-issue.test.ts b/integration-tests/create-issue/create-issue.test.ts
new file mode 100644
index 00000000..1e15d034
--- /dev/null
+++ b/integration-tests/create-issue/create-issue.test.ts
@@ -0,0 +1,5 @@
+import { runIntegrationTest } from "../runIntegrationTest"
+runIntegrationTest({
+  projectName: "create-issue",
+  shouldProduceSnapshots: true,
+})
diff --git a/integration-tests/create-issue/open.mock.js b/integration-tests/create-issue/open.mock.js
new file mode 100644
index 00000000..b2fe72e6
--- /dev/null
+++ b/integration-tests/create-issue/open.mock.js
@@ -0,0 +1,7 @@
+module.exports = (url) => {
+  const [resource, query] = url.split("?")
+  console.log("MOCK opening", resource)
+  const { title, body } = require("querystring").parse(query)
+  console.log("MOCK title", title)
+  console.log("MOCK body", body)
+}
diff --git a/integration-tests/create-issue/package.json b/integration-tests/create-issue/package.json
new file mode 100644
index 00000000..e8177ce2
--- /dev/null
+++ b/integration-tests/create-issue/package.json
@@ -0,0 +1,13 @@
+{
+  "name": "create-issue",
+  "version": "1.0.0",
+  "description": "integration test for patch-package",
+  "main": "index.js",
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "left-pad": "^1.3.0",
+    "lodash": "^4.17.21",
+    "replace": "^1.2.0"
+  }
+}
diff --git a/integration-tests/create-issue/yarn.lock b/integration-tests/create-issue/yarn.lock
new file mode 100644
index 00000000..e32f79dc
--- /dev/null
+++ b/integration-tests/create-issue/yarn.lock
@@ -0,0 +1,264 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+ansi-regex@^5.0.0:
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/ansi-regex/-/ansi-regex-5.0.0.tgz#388539f55179bf39339c81af30a654d69f87cb75"
+  integrity sha512-bY6fj56OUQ0hU1KjFNDQuJFezqKdrAyFdIevADiqrWHwSlbmBNMHp5ak2f40Pm8JTFyM2mqxkG6ngkHO11f/lg==
+
+ansi-styles@^3.2.1:
+  version "3.2.1"
+  resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-3.2.1.tgz#41fbb20243e50b12be0f04b8dedbf07520ce841d"
+  integrity sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==
+  dependencies:
+    color-convert "^1.9.0"
+
+ansi-styles@^4.0.0:
+  version "4.3.0"
+  resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-4.3.0.tgz#edd803628ae71c04c85ae7a0906edad34b648937"
+  integrity sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==
+  dependencies:
+    color-convert "^2.0.1"
+
+balanced-match@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-1.0.0.tgz#89b4d199ab2bee49de164ea02b89ce462d71b767"
+  integrity sha1-ibTRmasr7kneFk6gK4nORi1xt2c=
+
+brace-expansion@^1.1.7:
+  version "1.1.11"
+  resolved "https://registry.yarnpkg.com/brace-expansion/-/brace-expansion-1.1.11.tgz#3c7fcbf529d87226f3d2f52b966ff5271eb441dd"
+  integrity sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==
+  dependencies:
+    balanced-match "^1.0.0"
+    concat-map "0.0.1"
+
+camelcase@^5.0.0:
+  version "5.3.1"
+  resolved "https://registry.yarnpkg.com/camelcase/-/camelcase-5.3.1.tgz#e3c9b31569e106811df242f715725a1f4c494320"
+  integrity sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==
+
+chalk@2.4.2:
+  version "2.4.2"
+  resolved "https://registry.yarnpkg.com/chalk/-/chalk-2.4.2.tgz#cd42541677a54333cf541a49108c1432b44c9424"
+  integrity sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==
+  dependencies:
+    ansi-styles "^3.2.1"
+    escape-string-regexp "^1.0.5"
+    supports-color "^5.3.0"
+
+cliui@^6.0.0:
+  version "6.0.0"
+  resolved "https://registry.yarnpkg.com/cliui/-/cliui-6.0.0.tgz#511d702c0c4e41ca156d7d0e96021f23e13225b1"
+  integrity sha512-t6wbgtoCXvAzst7QgXxJYqPt0usEfbgQdftEPbLL/cvv6HPE5VgvqCuAIDR0NgU52ds6rFwqrgakNLrHEjCbrQ==
+  dependencies:
+    string-width "^4.2.0"
+    strip-ansi "^6.0.0"
+    wrap-ansi "^6.2.0"
+
+color-convert@^1.9.0:
+  version "1.9.3"
+  resolved "https://registry.yarnpkg.com/color-convert/-/color-convert-1.9.3.tgz#bb71850690e1f136567de629d2d5471deda4c1e8"
+  integrity sha512-QfAUtd+vFdAtFQcC8CCyYt1fYWxSqAiK2cSD6zDB8N3cpsEBAvRxp9zOGg6G/SHHJYAT88/az/IuDGALsNVbGg==
+  dependencies:
+    color-name "1.1.3"
+
+color-convert@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/color-convert/-/color-convert-2.0.1.tgz#72d3a68d598c9bdb3af2ad1e84f21d896abd4de3"
+  integrity sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==
+  dependencies:
+    color-name "~1.1.4"
+
+color-name@1.1.3:
+  version "1.1.3"
+  resolved "https://registry.yarnpkg.com/color-name/-/color-name-1.1.3.tgz#a7d0558bd89c42f795dd42328f740831ca53bc25"
+  integrity sha1-p9BVi9icQveV3UIyj3QIMcpTvCU=
+
+color-name@~1.1.4:
+  version "1.1.4"
+  resolved "https://registry.yarnpkg.com/color-name/-/color-name-1.1.4.tgz#c2a09a87acbde69543de6f63fa3995c826c536a2"
+  integrity sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==
+
+concat-map@0.0.1:
+  version "0.0.1"
+  resolved "https://registry.yarnpkg.com/concat-map/-/concat-map-0.0.1.tgz#d8a96bd77fd68df7793a73036a3ba0d5405d477b"
+  integrity sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=
+
+decamelize@^1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/decamelize/-/decamelize-1.2.0.tgz#f6534d15148269b20352e7bee26f501f9a191290"
+  integrity sha1-9lNNFRSCabIDUue+4m9QH5oZEpA=
+
+emoji-regex@^8.0.0:
+  version "8.0.0"
+  resolved "https://registry.yarnpkg.com/emoji-regex/-/emoji-regex-8.0.0.tgz#e818fd69ce5ccfcb404594f842963bf53164cc37"
+  integrity sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==
+
+escape-string-regexp@^1.0.5:
+  version "1.0.5"
+  resolved "https://registry.yarnpkg.com/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz#1b61c0562190a8dff6ae3bb2cf0200ca130b86d4"
+  integrity sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ=
+
+find-up@^4.1.0:
+  version "4.1.0"
+  resolved "https://registry.yarnpkg.com/find-up/-/find-up-4.1.0.tgz#97afe7d6cdc0bc5928584b7c8d7b16e8a9aa5d19"
+  integrity sha512-PpOwAdQ/YlXQ2vj8a3h8IipDuYRi3wceVQQGYWxNINccq40Anw7BlsEXCMbt1Zt+OLA6Fq9suIpIWD0OsnISlw==
+  dependencies:
+    locate-path "^5.0.0"
+    path-exists "^4.0.0"
+
+get-caller-file@^2.0.1:
+  version "2.0.5"
+  resolved "https://registry.yarnpkg.com/get-caller-file/-/get-caller-file-2.0.5.tgz#4f94412a82db32f36e3b0b9741f8a97feb031f7e"
+  integrity sha512-DyFP3BM/3YHTQOCUL/w0OZHR0lpKeGrxotcHWcqNEdnltqFwXVfhEBQ94eIo34AfQpo0rGki4cyIiftY06h2Fg==
+
+has-flag@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/has-flag/-/has-flag-3.0.0.tgz#b5d454dc2199ae225699f3467e5a07f3b955bafd"
+  integrity sha1-tdRU3CGZriJWmfNGfloH87lVuv0=
+
+is-fullwidth-code-point@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/is-fullwidth-code-point/-/is-fullwidth-code-point-3.0.0.tgz#f116f8064fe90b3f7844a38997c0b75051269f1d"
+  integrity sha512-zymm5+u+sCsSWyD9qNaejV3DFvhCKclKdizYaJUuHA83RLjb7nSuGnddCHGv0hk+KY7BMAlsWeK4Ueg6EV6XQg==
+
+left-pad@^1.3.0:
+  version "1.3.0"
+  resolved "https://registry.yarnpkg.com/left-pad/-/left-pad-1.3.0.tgz#5b8a3a7765dfe001261dde915589e782f8c94d1e"
+  integrity sha512-XI5MPzVNApjAyhQzphX8BkmKsKUxD4LdyK24iZeQGinBN9yTQT3bFlCBy/aVx2HrNcqQGsdot8ghrjyrvMCoEA==
+
+locate-path@^5.0.0:
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/locate-path/-/locate-path-5.0.0.tgz#1afba396afd676a6d42504d0a67a3a7eb9f62aa0"
+  integrity sha512-t7hw9pI+WvuwNJXwk5zVHpyhIqzg2qTlklJOf0mVxGSbe3Fp2VieZcduNYjaLDoy6p9uGpQEGWG87WpMKlNq8g==
+  dependencies:
+    p-locate "^4.1.0"
+
+lodash@^4.17.21:
+  version "4.17.21"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.21.tgz#679591c564c3bffaae8454cf0b3df370c3d6911c"
+  integrity sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==
+
+minimatch@3.0.4:
+  version "3.0.4"
+  resolved "https://registry.yarnpkg.com/minimatch/-/minimatch-3.0.4.tgz#5166e286457f03306064be5497e8dbb0c3d32083"
+  integrity sha512-yJHVQEhyqPLUTgt9B83PXu6W3rx4MvvHvSUvToogpwoGDOUQ+yDrR0HRot+yOCdCO7u4hX3pWft6kWBBcqh0UA==
+  dependencies:
+    brace-expansion "^1.1.7"
+
+p-limit@^2.2.0:
+  version "2.3.0"
+  resolved "https://registry.yarnpkg.com/p-limit/-/p-limit-2.3.0.tgz#3dd33c647a214fdfffd835933eb086da0dc21db1"
+  integrity sha512-//88mFWSJx8lxCzwdAABTJL2MyWB12+eIY7MDL2SqLmAkeKU9qxRvWuSyTjm3FUmpBEMuFfckAIqEaVGUDxb6w==
+  dependencies:
+    p-try "^2.0.0"
+
+p-locate@^4.1.0:
+  version "4.1.0"
+  resolved "https://registry.yarnpkg.com/p-locate/-/p-locate-4.1.0.tgz#a3428bb7088b3a60292f66919278b7c297ad4f07"
+  integrity sha512-R79ZZ/0wAxKGu3oYMlz8jy/kbhsNrS7SKZ7PxEHBgJ5+F2mtFW2fK2cOtBh1cHYkQsbzFV7I+EoRKe6Yt0oK7A==
+  dependencies:
+    p-limit "^2.2.0"
+
+p-try@^2.0.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/p-try/-/p-try-2.2.0.tgz#cb2868540e313d61de58fafbe35ce9004d5540e6"
+  integrity sha512-R4nPAVTAU0B9D35/Gk3uJf/7XYbQcyohSKdvAxIRSNghFl4e71hVoGnBNQz9cWaXxO2I10KTC+3jMdvvoKw6dQ==
+
+path-exists@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/path-exists/-/path-exists-4.0.0.tgz#513bdbe2d3b95d7762e8c1137efa195c6c61b5b3"
+  integrity sha512-ak9Qy5Q7jYb2Wwcey5Fpvg2KoAc/ZIhLSLOSBmRmygPsGwkVVt0fZa0qrtMz+m6tJTAHfZQ8FnmB4MG4LWy7/w==
+
+replace@^1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/replace/-/replace-1.2.0.tgz#a25da288841aab22f0f7e95dc1d249dbd2ed6e26"
+  integrity sha512-e3AP5GkRk+N/Qm1MUBaMhEHr4X3sHNI44a8m4ww6/qShJphTsStxSezbYtFNTFGCXZtWrwz4McVvCEwBv+ebAw==
+  dependencies:
+    chalk "2.4.2"
+    minimatch "3.0.4"
+    yargs "^15.3.1"
+
+require-directory@^2.1.1:
+  version "2.1.1"
+  resolved "https://registry.yarnpkg.com/require-directory/-/require-directory-2.1.1.tgz#8c64ad5fd30dab1c976e2344ffe7f792a6a6df42"
+  integrity sha1-jGStX9MNqxyXbiNE/+f3kqam30I=
+
+require-main-filename@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/require-main-filename/-/require-main-filename-2.0.0.tgz#d0b329ecc7cc0f61649f62215be69af54aa8989b"
+  integrity sha512-NKN5kMDylKuldxYLSUfrbo5Tuzh4hd+2E8NPPX02mZtn1VuREQToYe/ZdlJy+J3uCpfaiGF05e7B8W0iXbQHmg==
+
+set-blocking@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/set-blocking/-/set-blocking-2.0.0.tgz#045f9782d011ae9a6803ddd382b24392b3d890f7"
+  integrity sha1-BF+XgtARrppoA93TgrJDkrPYkPc=
+
+string-width@^4.1.0, string-width@^4.2.0:
+  version "4.2.1"
+  resolved "https://registry.yarnpkg.com/string-width/-/string-width-4.2.1.tgz#1933ce1f470973d224368009bd1316cad81d5f4f"
+  integrity sha512-LL0OLyN6AnfV9xqGQpDBwedT2Rt63737LxvsRxbcwpa2aIeynBApG2Sm//F3TaLHIR1aJBN52DWklc06b94o5Q==
+  dependencies:
+    emoji-regex "^8.0.0"
+    is-fullwidth-code-point "^3.0.0"
+    strip-ansi "^6.0.0"
+
+strip-ansi@^6.0.0:
+  version "6.0.0"
+  resolved "https://registry.yarnpkg.com/strip-ansi/-/strip-ansi-6.0.0.tgz#0b1571dd7669ccd4f3e06e14ef1eed26225ae532"
+  integrity sha512-AuvKTrTfQNYNIctbR1K/YGTR1756GycPsg7b9bdV9Duqur4gv6aKqHXah67Z8ImS7WEz5QVcOtlfW2rZEugt6w==
+  dependencies:
+    ansi-regex "^5.0.0"
+
+supports-color@^5.3.0:
+  version "5.5.0"
+  resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-5.5.0.tgz#e2e69a44ac8772f78a1ec0b35b689df6530efc8f"
+  integrity sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==
+  dependencies:
+    has-flag "^3.0.0"
+
+which-module@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/which-module/-/which-module-2.0.0.tgz#d9ef07dce77b9902b8a3a8fa4b31c3e3f7e6e87a"
+  integrity sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=
+
+wrap-ansi@^6.2.0:
+  version "6.2.0"
+  resolved "https://registry.yarnpkg.com/wrap-ansi/-/wrap-ansi-6.2.0.tgz#e9393ba07102e6c91a3b221478f0257cd2856e53"
+  integrity sha512-r6lPcBGxZXlIcymEu7InxDMhdW0KDxpLgoFLcguasxCaJ/SOIZwINatK9KY/tf+ZrlywOKU0UDj3ATXUBfxJXA==
+  dependencies:
+    ansi-styles "^4.0.0"
+    string-width "^4.1.0"
+    strip-ansi "^6.0.0"
+
+y18n@^4.0.0:
+  version "4.0.1"
+  resolved "https://registry.yarnpkg.com/y18n/-/y18n-4.0.1.tgz#8db2b83c31c5d75099bb890b23f3094891e247d4"
+  integrity sha512-wNcy4NvjMYL8gogWWYAO7ZFWFfHcbdbE57tZO8e4cbpj8tfUcwrwqSl3ad8HxpYWCdXcJUCeKKZS62Av1affwQ==
+
+yargs-parser@^18.1.2:
+  version "18.1.3"
+  resolved "https://registry.yarnpkg.com/yargs-parser/-/yargs-parser-18.1.3.tgz#be68c4975c6b2abf469236b0c870362fab09a7b0"
+  integrity sha512-o50j0JeToy/4K6OZcaQmW6lyXXKhq7csREXcDwk2omFPJEwUNOVtJKvmDr9EI1fAJZUyZcRF7kxGBWmRXudrCQ==
+  dependencies:
+    camelcase "^5.0.0"
+    decamelize "^1.2.0"
+
+yargs@^15.3.1:
+  version "15.4.1"
+  resolved "https://registry.yarnpkg.com/yargs/-/yargs-15.4.1.tgz#0d87a16de01aee9d8bec2bfbf74f67851730f4f8"
+  integrity sha512-aePbxDmcYW++PaqBsJ+HYUFwCdv4LVvdnhBy78E57PIor8/OVvhMrADFFEDh8DHDFRv/O9i3lPhsENjO7QX0+A==
+  dependencies:
+    cliui "^6.0.0"
+    decamelize "^1.2.0"
+    find-up "^4.1.0"
+    get-caller-file "^2.0.1"
+    require-directory "^2.1.1"
+    require-main-filename "^2.0.0"
+    set-blocking "^2.0.0"
+    string-width "^4.2.0"
+    which-module "^2.0.0"
+    y18n "^4.0.0"
+    yargs-parser "^18.1.2"
diff --git a/integration-tests/happy-path-npm/__snapshots__/happy-path-npm.test.ts.snap b/integration-tests/happy-path-npm/__snapshots__/happy-path-npm.test.ts.snap
index ba8b69d5..ee54e635 100644
--- a/integration-tests/happy-path-npm/__snapshots__/happy-path-npm.test.ts.snap
+++ b/integration-tests/happy-path-npm/__snapshots__/happy-path-npm.test.ts.snap
@@ -7,6 +7,11 @@ patch-package 0.0.0
 • Installing left-pad@1.1.3 with npm
 • Diffing your files with clean files
 ✔ Created file patches/left-pad+1.1.3.patch
+
+💡 left-pad is on GitHub! To draft an issue based on your patch run
+
+    npx patch-package left-pad --create-issue
+
 END SNAPSHOT"
 `;
 
diff --git a/integration-tests/happy-path-yarn/__snapshots__/happy-path-yarn.test.ts.snap b/integration-tests/happy-path-yarn/__snapshots__/happy-path-yarn.test.ts.snap
index b007ce6c..0b22e347 100644
--- a/integration-tests/happy-path-yarn/__snapshots__/happy-path-yarn.test.ts.snap
+++ b/integration-tests/happy-path-yarn/__snapshots__/happy-path-yarn.test.ts.snap
@@ -7,6 +7,11 @@ patch-package 0.0.0
 • Installing left-pad@1.1.3 with yarn
 • Diffing your files with clean files
 ✔ Created file patches/left-pad+1.1.3.patch
+
+💡 left-pad is on GitHub! To draft an issue based on your patch run
+
+    yarn patch-package left-pad --create-issue
+
 END SNAPSHOT"
 `;
 
diff --git a/integration-tests/ignores-scripts-when-making-patch/__snapshots__/ignores-scripts-when-making-patch.test.ts.snap b/integration-tests/ignores-scripts-when-making-patch/__snapshots__/ignores-scripts-when-making-patch.test.ts.snap
index c7bd32ac..1c31fe46 100644
--- a/integration-tests/ignores-scripts-when-making-patch/__snapshots__/ignores-scripts-when-making-patch.test.ts.snap
+++ b/integration-tests/ignores-scripts-when-making-patch/__snapshots__/ignores-scripts-when-making-patch.test.ts.snap
@@ -22,6 +22,7 @@ patch-package 0.0.0
 • Installing naughty-package@1.0.0 with yarn
 • Diffing your files with clean files
 ✔ Created file patches/naughty-package+1.0.0.patch
+
 END SNAPSHOT"
 `;
 
diff --git a/integration-tests/lerna-canary/__snapshots__/lerna-canary.test.ts.snap b/integration-tests/lerna-canary/__snapshots__/lerna-canary.test.ts.snap
index f82f56a8..1dfdf267 100644
--- a/integration-tests/lerna-canary/__snapshots__/lerna-canary.test.ts.snap
+++ b/integration-tests/lerna-canary/__snapshots__/lerna-canary.test.ts.snap
@@ -7,6 +7,11 @@ patch-package 0.0.0
 • Installing @parcel/codeframe@2.0.0-nightly.137 with yarn
 • Diffing your files with clean files
 ✔ Created file patches/@parcel+codeframe+2.0.0-nightly.137.patch
+
+💡 @parcel/codeframe is on GitHub! To draft an issue based on your patch run
+
+    yarn patch-package @parcel/codeframe --create-issue
+
 END SNAPSHOT"
 `;
 
diff --git a/integration-tests/nested-packages/__snapshots__/nested-packages.test.ts.snap b/integration-tests/nested-packages/__snapshots__/nested-packages.test.ts.snap
index 2e69ced0..420488cc 100644
--- a/integration-tests/nested-packages/__snapshots__/nested-packages.test.ts.snap
+++ b/integration-tests/nested-packages/__snapshots__/nested-packages.test.ts.snap
@@ -7,6 +7,11 @@ patch-package 0.0.0
 • Installing string-width@2.1.1 with yarn
 • Diffing your files with clean files
 ✔ Created file patches/wrap-ansi++string-width+2.1.1.patch
+
+💡 string-width is on GitHub! To draft an issue based on your patch run
+
+    yarn patch-package wrap-ansi/string-width --create-issue
+
 END SNAPSHOT"
 `;
 
diff --git a/integration-tests/nested-scoped-packages/__snapshots__/nested-scoped-packages.test.ts.snap b/integration-tests/nested-scoped-packages/__snapshots__/nested-scoped-packages.test.ts.snap
index c03604b6..e30b642e 100644
--- a/integration-tests/nested-scoped-packages/__snapshots__/nested-scoped-packages.test.ts.snap
+++ b/integration-tests/nested-scoped-packages/__snapshots__/nested-scoped-packages.test.ts.snap
@@ -7,6 +7,11 @@ patch-package 0.0.0
 • Installing @types/angular@1.6.53 with yarn
 • Diffing your files with clean files
 ✔ Created file patches/@microsoft+mezzurite-core++@types+angular+1.6.53.patch
+
+💡 @types/angular is on GitHub! To draft an issue based on your patch run
+
+    yarn patch-package @microsoft/mezzurite-core/@types/angular --create-issue
+
 END SNAPSHOT"
 `;
 
diff --git a/package.json b/package.json
index ed8f1cf0..cffc6642 100644
--- a/package.json
+++ b/package.json
@@ -68,7 +68,7 @@
     "ts-jest": "^24.0.0",
     "ts-node": "8.0.3",
     "tslint": "^5.14.0",
-    "typescript": "^3.6.3"
+    "typescript": "^4.2.2"
   },
   "dependencies": {
     "@yarnpkg/lockfile": "^1.1.0",
@@ -79,6 +79,7 @@
     "is-ci": "^2.0.0",
     "klaw-sync": "^6.0.0",
     "minimist": "^1.2.0",
+    "open": "^7.4.2",
     "rimraf": "^2.6.3",
     "semver": "^5.6.0",
     "slash": "^2.0.0",
diff --git a/src/createIssue.ts b/src/createIssue.ts
new file mode 100644
index 00000000..95c42a02
--- /dev/null
+++ b/src/createIssue.ts
@@ -0,0 +1,104 @@
+import chalk from "chalk"
+import open from "open"
+import { stringify } from "querystring"
+import { PackageManager } from "./detectPackageManager"
+import { PackageDetails } from "./PackageDetails"
+import { join, resolve } from "./path"
+
+const repoSpecifier = /^([\w.-]+)\/([\w.-]+)$/
+const githubURL = /github.com(:|\/)([\w.-]+\/[\w.-]+?)(.git|\/.*)?$/
+
+function parseRepoString(
+  repository: string,
+): null | { repo: string; org: string; provider: "GitHub" } {
+  if (repository.startsWith("github:")) {
+    repository = repository.replace(/^github:/, "")
+  }
+  const urlMatch = repository.match(githubURL)
+  if (urlMatch) {
+    repository = urlMatch[2]
+  }
+
+  const specMatch = repository.match(repoSpecifier)
+
+  if (!specMatch) {
+    return null
+  }
+  const [, org, repo] = specMatch
+
+  return { org, repo, provider: "GitHub" }
+}
+
+function getPackageVCSDetails(packageDetails: PackageDetails) {
+  const repository = require(resolve(join(packageDetails.path, "package.json")))
+    .repository as undefined | string | { url: string }
+
+  if (!repository) {
+    return null
+  }
+  if (typeof repository === "string") {
+    return parseRepoString(repository)
+  } else if (
+    typeof repository === "object" &&
+    typeof repository.url === "string"
+  ) {
+    return parseRepoString(repository.url)
+  }
+}
+
+export function maybePrintIssueCreationPrompt(
+  packageDetails: PackageDetails,
+  packageManager: PackageManager,
+) {
+  const vcs = getPackageVCSDetails(packageDetails)
+  if (vcs) {
+    console.log(`💡 ${chalk.bold(packageDetails.name)} is on ${
+      vcs.provider
+    }! To draft an issue based on your patch run
+
+    ${packageManager === "yarn" ? "yarn" : "npx"} patch-package ${
+      packageDetails.pathSpecifier
+    } --create-issue
+`)
+  }
+}
+
+export function openIssueCreationLink({
+  packageDetails,
+  patchFileContents,
+}: {
+  packageDetails: PackageDetails
+  patchFileContents: string
+}) {
+  const vcs = getPackageVCSDetails(packageDetails)
+
+  if (!vcs) {
+    console.error(
+      `Error: Couldn't find VCS details for ${packageDetails.pathSpecifier}`,
+    )
+    process.exit(1)
+  }
+
+  // trim off trailing newline since we add an extra one in the markdown block
+  if (patchFileContents.endsWith("\n")) {
+    patchFileContents = patchFileContents.slice(0, -1)
+  }
+
+  open(
+    `https://github.com/${vcs.org}/${vcs.repo}/issues/new?${stringify({
+      title: "[Replace me]",
+      body: `Hi! 👋 
+      
+Firstly, thanks for your work on this project! 🙂
+
+Today I used [patch-package](https://github.com/ds300/patch-package) to patch \`${packageDetails.name}\` for the project I'm working on because [Insert reason here].
+
+Here is the diff that solved my problem:
+
+\`\`\`diff
+${patchFileContents}
+\`\`\`
+`,
+    })}`,
+  )
+}
diff --git a/src/index.ts b/src/index.ts
index 1847e4f4..a4691a28 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -21,6 +21,7 @@ const argv = minimist(process.argv.slice(2), {
     "help",
     "version",
     "error-on-fail",
+    "create-issue",
   ],
   string: ["patch-dir"],
 })
@@ -58,6 +59,7 @@ if (argv.version || argv.v) {
       appPath,
       argv["use-yarn"] ? "yarn" : null,
     )
+    const createIssue = argv["create-issue"]
     packageNames.forEach((packagePathSpecifier: string) => {
       makePatch({
         packagePathSpecifier,
@@ -66,6 +68,7 @@ if (argv.version || argv.v) {
         includePaths,
         excludePaths,
         patchDir,
+        createIssue,
       })
     })
   } else {
@@ -137,6 +140,11 @@ Usage:
   based on any changes you've made to the versions installed by yarn/npm.
 
   Options:
+  
+    ${chalk.bold("--create-issue")}
+    
+       For packages whose source is hosted on GitHub this option opens a web
+       browser with a draft issue based on your diff.
 
     ${chalk.bold("--use-yarn")}
 
diff --git a/src/makePatch.ts b/src/makePatch.ts
index 97787ef7..5ff928cf 100644
--- a/src/makePatch.ts
+++ b/src/makePatch.ts
@@ -17,12 +17,17 @@ import { getPatchFiles } from "./patchFs"
 import {
   getPatchDetailsFromCliString,
   getPackageDetailsFromPatchFilename,
+  PackageDetails,
 } from "./PackageDetails"
 import { resolveRelativeFileDependencies } from "./resolveRelativeFileDependencies"
 import { getPackageResolution } from "./getPackageResolution"
 import { parsePatchFile } from "./patch/parse"
 import { gzipSync } from "zlib"
 import { getPackageVersion } from "./getPackageVersion"
+import {
+  maybePrintIssueCreationPrompt,
+  openIssueCreationLink,
+} from "./createIssue"
 
 function printNoPackageFoundError(
   packageName: string,
@@ -42,6 +47,7 @@ export function makePatch({
   includePaths,
   excludePaths,
   patchDir,
+  createIssue,
 }: {
   packagePathSpecifier: string
   appPath: string
@@ -49,6 +55,7 @@ export function makePatch({
   includePaths: RegExp
   excludePaths: RegExp
   patchDir: string
+  createIssue: boolean
 }) {
   const packageDetails = getPatchDetailsFromCliString(packagePathSpecifier)
 
@@ -264,10 +271,6 @@ export function makePatch({
       return
     }
 
-    const packageNames = packageDetails.packageNames
-      .map((name) => name.replace(/\//g, "+"))
-      .join("++")
-
     // maybe delete existing
     getPatchFiles(patchDir).forEach((filename) => {
       const deets = getPackageDetailsFromPatchFilename(filename)
@@ -276,7 +279,10 @@ export function makePatch({
       }
     })
 
-    const patchFileName = `${packageNames}+${packageVersion}.patch`
+    const patchFileName = createPatchFileName({
+      packageDetails,
+      packageVersion,
+    })
 
     const patchPath = join(patchesDir, patchFileName)
     if (!existsSync(dirname(patchPath))) {
@@ -285,8 +291,16 @@ export function makePatch({
     }
     writeFileSync(patchPath, diffResult.stdout)
     console.log(
-      `${chalk.green("✔")} Created file ${join(patchDir, patchFileName)}`,
+      `${chalk.green("✔")} Created file ${join(patchDir, patchFileName)}\n`,
     )
+    if (createIssue) {
+      openIssueCreationLink({
+        packageDetails,
+        patchFileContents: diffResult.stdout.toString(),
+      })
+    } else {
+      maybePrintIssueCreationPrompt(packageDetails, packageManager)
+    }
   } catch (e) {
     console.error(e)
     throw e
@@ -294,3 +308,17 @@ export function makePatch({
     tmpRepo.removeCallback()
   }
 }
+
+function createPatchFileName({
+  packageDetails,
+  packageVersion,
+}: {
+  packageDetails: PackageDetails
+  packageVersion: string
+}) {
+  const packageNames = packageDetails.packageNames
+    .map((name) => name.replace(/\//g, "+"))
+    .join("++")
+
+  return `${packageNames}+${packageVersion}.patch`
+}
diff --git a/yarn.lock b/yarn.lock
index 1d0efdc4..6e3bfe03 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4143,7 +4143,7 @@ onetime@^5.1.2:
   dependencies:
     mimic-fn "^2.1.0"
 
-open@^7.3.0:
+open@^7.3.0, open@^7.4.2:
   version "7.4.2"
   resolved "https://registry.yarnpkg.com/open/-/open-7.4.2.tgz#b8147e26dcf3e426316c730089fd71edd29c2321"
   integrity sha512-MVHddDVweXZF3awtlAS+6pgKLlm/JgxZ90+/NBurBoQctVOOB/zDdVjcyPzQ+0laDGbsWgrRkflI65sQeOgT9Q==
@@ -5666,10 +5666,10 @@ typedarray-to-buffer@^3.1.5:
   dependencies:
     is-typedarray "^1.0.0"
 
-typescript@^3.6.3:
-  version "3.6.3"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.6.3.tgz#fea942fabb20f7e1ca7164ff626f1a9f3f70b4da"
-  integrity sha512-N7bceJL1CtRQ2RiG0AQME13ksR7DiuQh/QehubYcghzv20tnh+MQnQIuJddTmsbqYj+dztchykemz0zFzlvdQw==
+typescript@^4.2.2:
+  version "4.2.2"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.2.2.tgz#1450f020618f872db0ea17317d16d8da8ddb8c4c"
+  integrity sha512-tbb+NVrLfnsJy3M59lsDgrzWIflR4d4TIUjz+heUnHZwdF7YsrMTKoRERiIvI2lvBG95dfpLxB21WZhys1bgaQ==
 
 uglify-js@^3.1.4:
   version "3.5.2"