Cannot read property compilation of undefined vue 打包运行npm run build 报错
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运行npm run build打包时，报错如下：
我的package.json如下:
{ ... "dependencies": { "axios": "^0.18.0", "better-scroll": "^1.14.1", "body-parser": "^1.18.3", "cookie-parser": "^1.4.4", "cssnano": "^4.1.10", "jquery": "^3.3.1", "less": "^3.8.1", "less-loader": "^4.1.0", "lib-flexible": "^0.3.2", "mint-ui": "^2.2.13", "multer": "^1.4.1", "pdfjs-dist": "^2.0.943", "postcss-aspect-ratio-mini": "0.0.2", "postcss-cssnext": "^3.1.0", "postcss-px-to-viewport": "0.0.3", "postcss-viewport-units": "^0.1.6", "postcss-write-svg": "^3.0.1", "purgecss": "^1.3.0", "px2rem-loader": "^0.1.9", "style-loader": "^0.23.1", "vue": "^2.5.2", "vue-router": "^3.0.1", "vuex": "^3.1.1", "webpack-dev-server": "^2.9.7" }, "devDependencies": { "autoprefixer": "^7.1.2", "babel-core": "^6.26.3", "babel-helper-vue-jsx-merge-props": "^2.0.3", "babel-loader": "^7.1.1", "babel-plugin-syntax-jsx": "^6.18.0", "babel-plugin-transform-runtime": "^6.22.0", "babel-plugin-transform-vue-jsx": "^3.5.0", "babel-preset-env": "^1.7.0", "babel-preset-stage-2": "^6.22.0", "chalk": "^2.0.1", "copy-webpack-plugin": "^4.0.1", "css-loader": "^2.1.1", "extract-text-webpack-plugin": "^3.0.0", "file-loader": "^1.1.4", "friendly-errors-webpack-plugin": "^1.6.1", "html-webpack-plugin": "^2.30.1", "js-cookie": "^2.2.0", "node-notifier": "^5.1.2", "optimize-css-assets-webpack-plugin": "^5.0.1", "ora": "^1.2.0", "portfinder": "^1.0.13", "postcss-import": "^11.0.0", "postcss-loader": "^2.0.8", "postcss-px2rem-exclude": "0.0.6", "postcss-url": "^7.2.1", "rimraf": "^2.6.0", "semver": "^5.3.0", "shelljs": "^0.7.6", "uglifyjs-webpack-plugin": "^1.1.1", "url-loader": "^1.1.2", "vue-loader": "^13.3.0", "vue-style-loader": "^3.0.1", "vue-template-compiler": "^2.5.2", "webpack": "^3.6.0", "webpack-cli": "^3.3.0", "webpack-merge": "^4.1.0" }, "engines": { "node": ">= 6.0.0", "npm": ">= 3.0.0" }, "browserslist": [ "> 1%", "last 2 versions", "not ie <= 8" ]} webpack是3.6.0的版本，但是optimize-css-assets-webpack-plugin是5.0.1的版本。后来把optimize-css-assets-webpack-plugin改为3.2.0的就可以了。
执行npm i optimize-css-assets-webpack-plugin@3.2.0就可以改为3.2.0的版本了。 注：如果执行 npm i optimize-css-assets-webpack-plugin@3.2.0完成后出现如下提示，不要按提示执行，会把optimize-css-assets-webpack-plugin恢复到原来的版本，直接忽略提示就好了。 如果还是不行，把package.json 修改
"optimize-css-assets-webpack-plugin": "^3.2.0",
重新npm install 解决
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