Webpack环境变量NODE_ENV与cli params --env

Question

what's the difference between set environment variable and cli environment options?

for example

cross-env NODE_ENV=production webpack

then

const isProd = process.env.NODE_ENV === 'production'

or

webpack --env.production

then

module.exports = function (env) {
 ....
}

which is better?

Answer 1

webpack --env.production is prob better since it will ensure that all variables that should be set are set. Admittedly, it is probably only setting NODE_ENV=production - however, in the future things might change and this approach will ensure you are always taking the best current approach.