#BUG# build 功能出问题了

[smithyj]

@sorrycc

问题说明

dev 是可以正常运行的，npm start 可以正常启动 build 就会挂

复现项目：https://github.com/smithyj/manage.yangyj.com

复现过程

npm 方式

git clone https://github.com/smithyj/manage.yangyj.com.git && cd manage.yangyj.com && npm install && npm run build

yarn 方式

git clone https://github.com/smithyj/manage.yangyj.com.git && cd manage.yangyj.com && yarn install && npm run build

复现结果

> manage.yangyj.com@0.0.1 build /Users/yyj/Docker/wwwroot/manage.yangyj.com
> umi build

/Users/yyj/Docker/wwwroot/manage.yangyj.com/node_modules/umi-build-dev/lib/routes/routesToJSON.js:48
        if (value.startsWith('() =>')) {
                  ^

TypeError: Cannot read property 'startsWith' of undefined
    at Object.JSON.stringify (/Users/yyj/Docker/wwwroot/manage.yangyj.com/node_modules/umi-build-dev/lib/routes/routesToJSON.js:48:19)
    at JSON.stringify (<anonymous>)
    at _default (/Users/yyj/Docker/wwwroot/manage.yangyj.com/node_modules/umi-build-dev/lib/routes/routesToJSON.js:45:15)
    at FilesGenerator.getRoutesJSON (/Users/yyj/Docker/wwwroot/manage.yangyj.com/node_modules/umi-build-dev/lib/FilesGenerator.js:275:38)
    at FilesGenerator.getRouterJSContent (/Users/yyj/Docker/wwwroot/manage.yangyj.com/node_modules/umi-build-dev/lib/FilesGenerator.js:237:54)
    at FilesGenerator.generateRouterJS (/Users/yyj/Docker/wwwroot/manage.yangyj.com/node_modules/umi-build-dev/lib/FilesGenerator.js:226:32)
    at FilesGenerator.generateFiles (/Users/yyj/Docker/wwwroot/manage.yangyj.com/node_modules/umi-build-dev/lib/FilesGenerator.js:136:10)
    at FilesGenerator.generate (/Users/yyj/Docker/wwwroot/manage.yangyj.com/node_modules/umi-build-dev/lib/FilesGenerator.js:58:10)
    at api.registerCommand (/Users/yyj/Docker/wwwroot/manage.yangyj.com/node_modules/umi-build-dev/lib/plugins/commands/build/index.js:34:20)
    at Service.run (/Users/yyj/Docker/wwwroot/manage.yangyj.com/node_modules/umi-build-dev/lib/Service.js:346:12)
    at Object.<anonymous> (/Users/yyj/Docker/wwwroot/manage.yangyj.com/node_modules/umi/lib/scripts/build.js:14:47)
    at Module._compile (internal/modules/cjs/loader.js:722:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:733:10)
    at Module.load (internal/modules/cjs/loader.js:620:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:560:12)
    at Function.Module._load (internal/modules/cjs/loader.js:552:3)

[sorrycc]

可以先这么绕过，

- { path: '/404', redirect: '/exception/404', hideMenu: true },
+ { path: '/404', component: '/Exception/404', hideMenu: true },