Defineplugin Use of Webpack

Defineplugin is a plug-in that webpack inject global variables, typically using the plug-in to determine the environment variables that the code is running. In the use of the plug-in need to note that if the plug-in configuration of the relevant parameters, must be used in the source code, Webpack will be injected. For example:

New Webpack. Defineplugin ({    ' process.env ': ' "Dev"})

We print process variables in source code

Console.log (Process)

Its output in the console is

We found no data in env, but if we use it in the source code:

Console.log (process.env)

The result is:

Using Process.env, the compiled code will have the variable

Defineplugin Use of Webpack