Arguments: /Users/fgm/.nvm/versions/node/v10.18.0/bin/node /Users/fgm/.yarn/bin/yarn.js add --dev webpack@^3.3.0 webpack-dev-server@^2.5.1 PATH: /Users/fgm/Downloads/Installables/google-cloud-sdk/bin:/Users/fgm/.nvm/versions/node/v10.18.0/bin:/usr/local/opt/php@7.2/sbin:/usr/local/opt/php@7.2/bin:./bin:./vendor/bin:~/.composer/vendor/bin:/Users/fgm/.yarn/bin:/usr/local/sbin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/mysql/bin:/Library/TeX/texbin:/usr/local/go/bin:/opt/X11/bin:.:/Users/fgm/npm/bin:/Users/fgm/src/go/bin:/Users/fgm/Library/Android/sdk/tools:/Users/fgm/Library/Android/sdk/platform-tools:/usr/local/texlive/2019/bin/x86_64-darwin/ Yarn version: 1.21.1 Node version: 10.18.0 Platform: darwin x64 Trace: SyntaxError: /Users/fgm/src/js/webpack/fundamentals/package.json: Unexpected token } in JSON at position 243 at JSON.parse () at /Users/fgm/.yarn/lib/cli.js:1625:59 at Generator.next () at step (/Users/fgm/.yarn/lib/cli.js:310:30) at /Users/fgm/.yarn/lib/cli.js:321:13 npm manifest: { "author": "Frederic G. MARAND ", "description": "Web Fundamentals", "devDependencies": { "prettier": "^1.19.1" }, "license": "MIT", "main": "build/index.js", "name": "web_fundamentals", "version": "1.0.0", } yarn manifest: No manifest Lockfile: # THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY. # yarn lockfile v1 prettier@^1.19.1: version "1.19.1" resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.19.1.tgz#f7d7f5ff8a9cd872a7be4ca142095956a60797cb" integrity sha512-s7PoyDv/II1ObgQunCbB9PdLmUcBZcnWOcxDh7O0N/UwDEsHyqkW+Qh28jW+mVuCdx7gLB0BotYI1Y6uI9iyew==