Webpack 3 fails on watch with cache being a function

[guidobouman]

Expected Behavior

When running grunt-webpack in watch mode it should not crash.

Current Behavior

When running grunt-webpack in watch mode the cache function in the defaults is not properly executed before being passed to webpack. Resulting in an invalid function ending up in the webpack config.

Possible Solution

Execute all defaults functions before outputting the config to webpack.

Context

Production builds are fine, but I can't run watch build right now. Crippling my development experience.

Your Environment

software	version
webpack	3.1.0
grunt-webpack	3.0.1
grunt	0.4.5
node	8.1.3
npm	5.1.0
Operating System	macOS 10.12.5

[guidobouman]

Workaround: Add cache: true along with watch: true, effectively defeating your config extensions.

[guidobouman]

PS: You have the watch checker is located on three different locations in your project:

1. https://github.com/webpack-contrib/grunt-webpack/blob/master/src/options/default.js#L24
2. https://github.com/webpack-contrib/grunt-webpack/blob/master/src/options/WebpackOptionHelper.js#L22
3. https://github.com/webpack-contrib/grunt-webpack/blob/master/tasks/webpack.js#L26

Seems a bit needlessly redundant.