升级Angular 5到7后无法构建生产环境，出现terser错误。

Question

升级Angular 5到7后无法构建生产环境，出现terser错误。

5

我有一个使用 Angular 5.2 的 Angular-cli 项目，我将其更新到了 Angular 7.2.3。一切都很好，ng serve、ng test 命令工作正常，但是当我想要使用 ng build --prod 命令时，发生了错误。

我按照指南（https://update.angular.io/）一步一步进行操作。

以下是错误信息：

ERROR in runtime.82c6613acef8f7246fe8.js from Terser
TypeError: Cannot read property 'minify' of undefined
    at minify (/Users/nicolasgarin/Desktop/afreecom/front/node_modules/terser-webpack-plugin/dist/minify.js:175:23)
    at module.exports (/Users/nicolasgarin/Desktop/afreecom/front/node_modules/terser-webpack-plugin/dist/worker.js:13:40)
    at handle (/Users/nicolasgarin/Desktop/afreecom/front/node_modules/worker-farm/lib/child/index.js:44:8)
    at process.<anonymous> (/Users/nicolasgarin/Desktop/afreecom/front/node_modules/worker-farm/lib/child/index.js:51:3)
    at process.emit (events.js:180:13)
    at emit (internal/child_process.js:783:12)
    at process._tickCallback (internal/process/next_tick.js:178:19)
ERROR in main.ae88265d57a522e8fef6.js from Terser
TypeError: Cannot read property 'minify' of undefined
    at minify (/Users/nicolasgarin/Desktop/afreecom/front/node_modules/terser-webpack-plugin/dist/minify.js:175:23)
    at module.exports (/Users/nicolasgarin/Desktop/afreecom/front/node_modules/terser-webpack-plugin/dist/worker.js:13:40)
    at handle (/Users/nicolasgarin/Desktop/afreecom/front/node_modules/worker-farm/lib/child/index.js:44:8)
    at process.<anonymous> (/Users/nicolasgarin/Desktop/afreecom/front/node_modules/worker-farm/lib/child/index.js:51:3)
    at process.emit (events.js:180:13)
    at emit (internal/child_process.js:783:12)
    at process._tickCallback (internal/process/next_tick.js:178:19)
ERROR in polyfills.93cd0d5603ed4cb47cce.js from Terser
TypeError: Cannot read property 'minify' of undefined
    at minify (/Users/nicolasgarin/Desktop/afreecom/front/node_modules/terser-webpack-plugin/dist/minify.js:175:23)
    at module.exports (/Users/nicolasgarin/Desktop/afreecom/front/node_modules/terser-webpack-plugin/dist/worker.js:13:40)
    at handle (/Users/nicolasgarin/Desktop/afreecom/front/node_modules/worker-farm/lib/child/index.js:44:8)
    at process.<anonymous> (/Users/nicolasgarin/Desktop/afreecom/front/node_modules/worker-farm/lib/child/index.js:51:3)
    at process.emit (events.js:180:13)
    at emit (internal/child_process.js:783:12)
    at process._tickCallback (internal/process/next_tick.js:178:19)
ERROR in styles.dcc46c6ff0d6be4a76ad.js from Terser
TypeError: Cannot read property 'minify' of undefined
    at minify (/Users/nicolasgarin/Desktop/afreecom/front/node_modules/terser-webpack-plugin/dist/minify.js:175:23)
    at module.exports (/Users/nicolasgarin/Desktop/afreecom/front/node_modules/terser-webpack-plugin/dist/worker.js:13:40)
    at handle (/Users/nicolasgarin/Desktop/afreecom/front/node_modules/worker-farm/lib/child/index.js:44:8)
    at process.<anonymous> (/Users/nicolasgarin/Desktop/afreecom/front/node_modules/worker-farm/lib/child/index.js:51:3)
    at process.emit (events.js:180:13)
    at emit (internal/child_process.js:783:12)
    at process._tickCallback (internal/process/next_tick.js:178:19)

我完全不知道出了什么问题，谷歌也没有帮助我。

- Nicolas Garin

与R. Richards上面链接的问题相同。我所做的修复可以在那里找到。我以为我已经弄坏了什么东西，但实际上是Terser更新出了问题。 - Mathias

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- Daniel · Accepted Answer

当前版本的Terser存在问题，因此您需要在package.json中将版本设置为3.14.1，如下所示："terser": "3.14.1",

如果您的代码中有"terser": "^3.14.1",，请务必删除^。