remove notCacheable

Author: sokra

lib/CachePlugin.js

@@ -20,26 +20,19 @@ class CachePlugin {
 		} else {
 			const registerCacheToCompiler = (compiler, cache) => {
 				compiler.plugin("this-compilation", compilation => {
-					// TODO remove notCacheable for webpack 4
-					if(!compilation.notCacheable) {
-						compilation.cache = cache;
-						compilation.plugin("child-compiler", (childCompiler, compilerName, compilerIndex) => {
-							if(cache) {
-								let childCache;
-								if(!cache.children) cache.children = {};
-								if(!cache.children[compilerName]) cache.children[compilerName] = [];
-								if(cache.children[compilerName][compilerIndex])
-									childCache = cache.children[compilerName][compilerIndex];
-								else
-									cache.children[compilerName].push(childCache = {});
-								registerCacheToCompiler(childCompiler, childCache);
-							}
-						});
-					} else if(this.watching) {
-						compilation.warnings.push(
-							new Error(`CachePlugin - Cache cannot be used because of: ${compilation.notCacheable}`)
-						);
-					}
+					compilation.cache = cache;
+					compilation.plugin("child-compiler", (childCompiler, compilerName, compilerIndex) => {
+						if(cache) {
+							let childCache;
+							if(!cache.children) cache.children = {};
+							if(!cache.children[compilerName]) cache.children[compilerName] = [];
+							if(cache.children[compilerName][compilerIndex])
+								childCache = cache.children[compilerName][compilerIndex];
+							else
+								cache.children[compilerName].push(childCache = {});
+							registerCacheToCompiler(childCompiler, childCache);
+						}
+					});
 				});
 			};
 			registerCacheToCompiler(compiler, this.cache);