Hacky working version

.env.example

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+# The ID of your GitHub App
+APP_ID=
+WEBHOOK_SECRET=development
+
+# Uncomment this to get verbose logging
+# LOG_LEVEL=trace # or `info` to show less
+
+# Subdomain to use for localtunnel server. Defaults to your local username.
+# SUBDOMAIN=

.gitignore

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+node_modules
+npm-debug.log
+*.pem
+.env

.travis.yml

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+sudo: false
+language: node_js
+node_js:
+  - "7.7.1"
+notifications:
+  disabled: true

LICENSE

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+ISC License
+
+Copyright (c) [year], {{ author }}
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

README.md

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+# {{ name }}
+
+> a GitHub App built with [probot](https://github.com/probot/probot) that {{ description }}
+
+## Setup
+
+```
+# Install dependencies
+npm install
+
+# Run the bot
+npm start
+```
+
+See [docs/deploy.md](docs/deploy.md) if you would like to run your own instance of this plugin.

app.json

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+{
+  "env": {
+    "PRIVATE_KEY": {
+      "description": "the private key you downloaded when creating the GitHub App"
+    },
+    "APP_ID": {
+      "description": "the ID of your GitHub App"
+    },
+    "WEBHOOK_SECRET": {
+      "description": "the secret configured for your GitHub App"
+    }
+  }
+}

docs/deploy.md

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+# Deploying
+
+If you would like to run your own instance of this plugin, see the [docs for deploying plugins](https://github.com/probot/probot/blob/master/docs/deployment.md).
+
+This plugin requires these **Permissions & events** for the GitHub App:
+
+> **TODO**: List permissions required for deployment here. See [probot/stale](https://github.com/probot/stale/blob/master/docs/deploy.md) for an example.

index.js

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+const yaml = require('js-yaml');
+const minimatch = require('minimatch');
+
+module.exports = robot => {
+  robot.on('pull_request.opened', autolabel);
+  robot.on('pull_request.synchronize', autolabel);
+
+  async function autolabel(context) {
+    const content = await context.github.repos.getContent(context.repo({
+      path: '.github/autolabeler.yml'
+    }));
+    const config = yaml.load(Buffer.from(content.data.content, 'base64').toString());
+
+    const files = await context.github.pullRequests.getFiles(context.issue());
+    const changedFiles = files.data.map(file => file.filename);
+
+    const labels = new Set();
+
+    // eslint-disable-next-line guard-for-in
+    for (const label in config) {
+      robot.log('looking for changes', label, config[label]);
+
+      const matches = [].concat(config[label]).find(glob => {
+        robot.log('comparing', glob, changedFiles);
+        return changedFiles.find(file => {
+          robot.log('matching', file, glob, minimatch(file, glob));
+          return minimatch(file, glob);
+        });
+      });
+
+      if (matches) {
+        robot.log('adding label', label);
+        labels.add(label);
+      }
+    }
+
+    const labelsToAdd = Array.from(labels);
+
+    robot.log('Adding labels', labelsToAdd);
+    if (labelsToAdd.length > 0) {
+      return context.github.issues.addLabels(context.issue({
+        labels: labelsToAdd
+      }));
+    }
+  }
+};