feat: add duolingo farm script

.gitignore

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+# Logs
+logs
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+npm-debug.log*
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+# yarn v2
+.yarn/cache
+.yarn/unplugged
+.yarn/build-state.yml
+.yarn/install-state.gz
+.pnp.*
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+.pnpm-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Snowpack dependency directory (https://snowpack.dev/)
+web_modules/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional stylelint cache
+.stylelintcache
+
+# Microbundle cache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variable files
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+.parcel-cache
+
+# Next.js build output
+.next
+out
+
+# Nuxt.js build / generate output
+.nuxt
+dist
+
+# Gatsby files
+.cache/
+# Comment in the public line in if your project uses Gatsby and not Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
+
+# vuepress build output
+.vuepress/dist
+
+# vuepress v2.x temp and cache directory
+.temp
+.cache
+
+# Docusaurus cache and generated files
+.docusaurus
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# TernJS port file
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+.vscode-test
+
+# yarn v2
+.yarn/cache
+.yarn/unplugged
+.yarn/build-state.yml
+.yarn/install-state.gz
+.pnp.*

README.md

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+# duolingo
+
+Script to farm Duolingo XP. Never get demoted again!

index.js

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+const id = document.cookie
+  .split(';')
+  .find(cookie => cookie.includes('logged_out_uuid'))
+  .split('=')[1]
+
+const { fromLanguage, learningLanguage, xpGains } = await fetch(
+  `https://www.duolingo.com/2017-06-30/users/${id}?fields=fromLanguage,learningLanguage,xpGains`,
+  {
+    credentials: 'include',
+    headers: {
+      'Content-Type': 'application/json',
+    },
+  },
+).then(response => response.json())
+
+const session = await fetch('https://www.duolingo.com/2017-06-30/sessions', {
+  body: JSON.stringify({
+    challengeTypes: [
+      'assist',
+      'characterIntro',
+      'characterMatch',
+      'characterPuzzle',
+      'characterSelect',
+      'characterTrace',
+      'completeReverseTranslation',
+      'definition',
+      'dialogue',
+      'form',
+      'freeResponse',
+      'gapFill',
+      'judge',
+      'listen',
+      'listenComplete',
+      'listenMatch',
+      'match',
+      'name',
+      'listenComprehension',
+      'listenIsolation',
+      'listenTap',
+      'partialListen',
+      'partialReverseTranslate',
+      'readComprehension',
+      'select',
+      'selectPronunciation',
+      'selectTranscription',
+      'syllableTap',
+      'syllableListenTap',
+      'speak',
+      'tapCloze',
+      'tapClozeTable',
+      'tapComplete',
+      'tapCompleteTable',
+      'tapDescribe',
+      'translate',
+      'typeCloze',
+      'typeClozeTable',
+      'typeCompleteTable',
+    ],
+    fromLanguage,
+    isFinalLevel: false,
+    isV2: true,
+    juicy: true,
+    learningLanguage,
+    skillId: xpGains.find(xpGain => xpGain.skillId).skillId,
+    smartTipsVersion: 2,
+    type: 'SPEAKING_PRACTICE',
+  }),
+  credentials: 'include',
+  headers: {
+    'Content-Type': 'application/json',
+  },
+  method: 'POST',
+}).then(response => response.json())
+
+const response = await fetch(
+  `https://www.duolingo.com/2017-06-30/sessions/${session.id}`,
+  {
+    body: JSON.stringify({
+      ...session,
+      heartsLeft: 0,
+      startTime: (+new Date() - 60000) / 1000,
+      enableBonusPoints: false,
+      endTime: +new Date() / 1000,
+      failed: false,
+      maxInLessonStreak: 9,
+      shouldLearnThings: true,
+    }),
+    credentials: 'include',
+    headers: {
+      'Content-Type': 'application/json',
+    },
+    method: 'PUT',
+  },
+).then(response => response.json())
+
+response.xpGain