fix: error when commonDistDirectory changed to custom value (#351)

Author: YokiToki

packages/electron-webpack/src/dev/dev-runner.ts

@@ -18,13 +18,17 @@ let socketPath: string | null = null
 
 const debug = require("debug")("electron-webpack")
 
-// do not remove main.js to allow IDE to keep breakpoints
-async function emptyMainOutput() {
+async function getOutDir() {
   const electronWebpackConfig = await getElectronWebpackConfiguration({
     projectDir,
     packageMetadata: getPackageMetadata(projectDir),
   })
-  const outDir = path.join(electronWebpackConfig.commonDistDirectory!!, "main")
+  return path.join(electronWebpackConfig.commonDistDirectory!!, "main")
+}
+
+// do not remove main.js to allow IDE to keep breakpoints
+async function emptyMainOutput() {
+  const outDir = await getOutDir()
   const files = await orNullIfFileNotExist(readdir(outDir))
   if (files == null) {
     return
@@ -59,8 +63,9 @@ class DevRunner {
     })
 
     const electronArgs = process.env.ELECTRON_ARGS
+    const outDir = await getOutDir()
     const args = electronArgs != null && electronArgs.length > 0 ? JSON.parse(electronArgs) : [`--inspect=${await getFreePort("127.0.0.1", 5858)}`]
-    args.push(path.join(projectDir, "dist/main/main.js"))
+    args.push(path.join(outDir, "/main.js"))
     // Pass remaining arguments to the application. Remove 3 instead of 2, to remove the `dev` argument as well.
     args.push(...process.argv.slice(3))
     // we should start only when both start and main are started