fix: Fix the problem that esbuild service cannot be detected due to c…

…hildcompiler in webpack For example, mini CSS extract plugin

Among the common plugins in webpack, many plugins create child-compiler to build their own chunks.
However, the value of $esbuildservice is not correctly assigned, which causes errors in the
compilation of webpack on the child-compiler,For example, mini CSS extract plugin

Closes privatenumber#16

src/plugin.js

@@ -13,6 +13,15 @@ class ESBuildPlugin {
       }
     }
 
+    compiler.hooks.thisCompilation.tap('esbuild', (compilation) => {
+      compilation.hooks.childCompiler.tap(
+        'esbuild',
+        (childCompiler, _compilerName, _compilerIndex) => {
+          childCompiler.$esbuildService = compiler.$esbuildService
+        }
+      )
+    })
+
     compiler.hooks.run.tapPromise('esbuild', async () => {
       await startService()
     })