这是一个弃用警告信息：
DeprecationWarning: Tapable.apply被弃用。直接在插件上调用apply方法
DeprecationWarning: Tapable.plugin被弃用。使用.hooks的新API代替
这只是一个警告：
以下是对于遇到此消息的人的快速总结。
这个消息是什么意思？
Webpack 4正在使用一种新的插件系统，并弃用了以前的API。有两个新的警告：
DeprecationWarning: Tapable.apply is deprecated. Call apply on the plugin directly instead
DeprecationWarning: Tapable.plugin is deprecated. Use new API on `.hooks` instead
这些是警告信息。它们被输出到控制台以警告我们的用户正在使用过时的API，应该迁移到最新版本。
这些警告有多糟糕？
它们只是文本信息，而不是错误。如果你看到一个DeprecationWarning，你可以忽略它直到你需要更新到下一个主要版本的webpack。
所以除此之外，你没有或者不应该做任何事情。
除此之外，我相信你正在收到以下类型的错误：
/tmp/my-project> npm run dev
> my-project2@1.0.0 dev /tmp/my-project/my-project
> node build/dev-server.js
> Starting dev server...
(node:29408) DeprecationWarning: Tapable.plugin is deprecated. Use new API on `.hooks` instead
(node:29408) DeprecationWarning: Tapable.apply is deprecated. Call apply on the plugin directly instead
/tmp/my-project/node_modules/html-webpack-plugin/lib/compiler.js:81
var outputName = compilation.mainTemplate.applyPluginsWaterfall('asset-path', outputOptions.filename, {
^
TypeError: compilation.mainTemplate.applyPluginsWaterfall is not a function
at /tmp/my-project/node_modules/html-webpack-plugin/lib/compiler.js:81:51
at compile (/tmp/my-project/node_modules/webpack/lib/Compiler.js:242:11)
at hooks.afterCompile.callAsync.err (/tmp/my-project/node_modules/webpack/lib/Compiler.js:487:14)
at AsyncSeriesHook.eval [as callAsync] (eval at create (/tmp/my-project/node_modules/tapable/lib/HookCodeFactory.js:24:12), <anonymous>:15:1)
at AsyncSeriesHook.lazyCompileHook [as _callAsync] (/tmp/my-project/node_modules/tapable/lib/Hook.js:35:21)
at compilation.seal.err (/tmp/my-project/node_modules/webpack/lib/Compiler.js:484:30)
at AsyncSeriesHook.eval [as callAsync] (eval at create (/tmp/my-project/node_modules/tapable/lib/HookCodeFactory.js:24:12), <anonymous>:6:1)
at AsyncSeriesHook.lazyCompileHook [as _callAsync] (/tmp/my-project/node_modules/tapable/lib/Hook.js:35:21)
at hooks.optimizeAssets.callAsync.err (/tmp/my-project/node_modules/webpack/lib/Compilation.js:966:35)
at AsyncSeriesHook.eval [as callAsync] (eval at create (/tmp/my-project/node_modules/tapable/lib/HookCodeFactory.js:24:12), <anonymous>:6:1)
at AsyncSeriesHook.lazyCompileHook [as _callAsync] (/tmp/my-project/node_modules/tapable/lib/Hook.js:35:21)
at hooks.optimizeChunkAssets.callAsync.err (/tmp/my-project/node_modules/webpack/lib/Compilation.js:957:32)
at AsyncSeriesHook.eval [as callAsync] (eval at create (/tmp/my-project/node_modules/tapable/lib/HookCodeFactory.js:24:12), <anonymous>:6:1)
at AsyncSeriesHook.lazyCompileHook [as _callAsync] (/tmp/my-project/node_modules/tapable/lib/Hook.js:35:21)
at hooks.additionalAssets.callAsync.err (/tmp/my-project/node_modules/webpack/lib/Compilation.js:952:36)
at AsyncSeriesHook.eval [as callAsync] (eval at create (/tmp/my-project/node_modules/tapable/lib/HookCodeFactory.js:24:12), <anonymous>:6:1)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! my-project@1.0.0 dev: `node build/dev-server.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the my-project@1.0.0 dev script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
你应该将 html-webpack-plugin 更新至最新版本：
npm install --save-dev html-webpack-plugin@3
错误应该会消失。
