when installing web-ext i got this two messages in the and of installation:
npm WARN optional Skipping failed optional dependency /web-ext/chokidar/fsevents:
npm WARN notsup Not compatible with your operating system or architecture: [email protected]
after trying to start addon with web-ext run i get this messages
TypeError: Cannot read property 'R_OK' of undefined at fileIsReadable (/usr/local/lib/node_modules/web-ext/dist/webpack:/src/util/file-exists.js:24:42) at _callee$ (/usr/local/lib/node_modules/web-ext/dist/webpack:/src/util/file-exists.js:28:11) at tryCatch (/usr/local/lib/node_modules/web-ext/node_modules/regenerator-runtime/runtime.js:62:40) at GeneratorFunctionPrototype.invoke [as _invoke] (/usr/local/lib/node_modules/web-ext/node_modules/regenerator-runtime/runtime.js:296:22) at GeneratorFunctionPrototype.prototype.(anonymous function) [as next] (/usr/local/lib/node_modules/web-ext/node_modules/regenerator-runtime/runtime.js:114:21) at step (/usr/local/lib/node_modules/web-ext/dist/webpack:/node_modules/babel-runtime/helpers/asyncToGenerator.js:17:1) at /usr/local/lib/node_modules/web-ext/dist/webpack:/node_modules/babel-runtime/helpers/asyncToGenerator.js:35:1 at new Promise (/usr/local/lib/node_modules/web-ext/dist/webpack:/node_modules/core-js/library/modules/es6.promise.js:177:1) at /usr/local/lib/node_modules/web-ext/dist/webpack:/node_modules/babel-runtime/helpers/asyncToGenerator.js:14:1 at fileExists (/usr/local/lib/node_modules/web-ext/dist/web-ext.js:13002:17)
Update to at least the latest v6 of node. I recommend you to use >= v8, because the support for v6 is ending in 2019 and you can't use async/await for example. (https://github.com/nodejs/Release#release-schedule)