解决nextjs部署到now上之后出现的“Unable to import module ‘now__launcher‘”错误
这个错误是由于在next.config.js中直接引用了withLess之类的插件导致的。在now环境下require插件需要在PHASE_PRODUCTION_SERVER阶段下，如果不加这个阶段的判断就会报错。
这个是错误的做法
// ? Don‘t put this here
const withCSS = require(‘@zeit/next-css‘); // 由于不在PHASE_PRODUCTION_SERVER阶段所以报错const { PHASE_PRODUCTION_SERVER } = ?process.env.NODE_ENV === ‘development‘ ???? {} ???: !process.env.NOW_REGION ?????? require(‘next/constants‘) ?????: require(‘next-server/constants‘);module.exports = (phase, { defaultConfig }) => { ?if (phase === PHASE_PRODUCTION_SERVER) { ???// Config used to run in production. ???return {}; ?} ??return withCSS();};正确的写法：
const { PHASE_PRODUCTION_SERVER } = ?process.env.NODE_ENV === ‘development‘ ???? {} ???: !process.env.NOW_REGION ?????? require(‘next/constants‘) ?????: require(‘next-server/constants‘);module.exports = (phase, { defaultConfig }) => { ?if (phase === PHASE_PRODUCTION_SERVER) { ???// Config used to run in production. ???return {}; ?} ??// ? Put the require call here. ?const withCSS = require(‘@zeit/next-css‘); ??return withCSS();};参考：https://github.com/zeit/next.js/issues/5750
解决nextjs部署到now上之后出现的“Unable to import module 'now__launcher'”错误
原文地址：https://www.cnblogs.com/axel10/p/10260086.html