ESM: Config scripts now run synchronously before webpack builds start

package-lock.json

@@ -12652,12 +12652,6 @@
       "integrity": "sha1-Iyxi7GCSsQBjWj0p2DwXRxKN+b0=",
       "dev": true
     },
-    "webpack-shell-plugin": {
-      "version": "0.5.0",
-      "resolved": "https://registry.npmjs.org/webpack-shell-plugin/-/webpack-shell-plugin-0.5.0.tgz",
-      "integrity": "sha1-Kbih2A3erg3bEOcpZn9yhlPCx0I=",
-      "dev": true
-    },
     "webpack-sources": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/webpack-sources/-/webpack-sources-1.0.1.tgz",
@@ -12668,6 +12662,15 @@
         "source-map": "0.5.7"
       }
     },
+    "webpack-synchronizable-shell-plugin": {
+      "version": "0.0.7",
+      "resolved": "https://registry.npmjs.org/webpack-synchronizable-shell-plugin/-/webpack-synchronizable-shell-plugin-0.0.7.tgz",
+      "integrity": "sha512-b1ZPHwkHR5+MDRLp9CbLxDaaTTcf4/tmxU+Tc6Z3lpv6krnIPv0doXfgBHkDthHUkwsURyO9fgRnJ/VxyFBEwQ==",
+      "dev": true,
+      "requires": {
+        "babel-polyfill": "6.26.0"
+      }
+    },
     "websocket-driver": {
       "version": "0.7.0",
       "resolved": "https://registry.npmjs.org/websocket-driver/-/websocket-driver-0.7.0.tgz",

package.json

@@ -63,7 +63,7 @@
     "webpack": "^4.0.1",
     "webpack-dev-server": "^3.1.0",
     "webpack-node-externals": "^1.6.0",
-    "webpack-shell-plugin": "^0.5.0",
+    "webpack-synchronizable-shell-plugin": "0.0.7",
     "worker-loader": "^1.1.1"
   },
   "dependencies": {

src/core/config/scripts/generateConfig.mjs

@@ -52,21 +52,20 @@ for (const opObj in Ops) {
 /**
  * Write OperationConfig.
  */
-fs.writeFile(
+fs.writeFileSync(
     path.join(dir, "OperationConfig.json"),
-    JSON.stringify(operationConfig, null, 4),
-    err => {
-        if (err) {
-            console.error(err);
-            process.exit(1);
-        }
-    }
+    JSON.stringify(operationConfig, null, 4)
 );
+console.log("Written OperationConfig.json");
 
 
 /**
  * Write modules.
  */
+if (!fs.existsSync(path.join(dir, "modules/"))) {
+    fs.mkdirSync(path.join(dir, "modules/"));
+}
+
 for (const module in modules) {
     let code = `/**
 * THIS FILE IS AUTOMATICALLY GENERATED BY src/core/config/scripts/generateConfig.mjs
@@ -96,16 +95,11 @@ OpModules.${module} = {
 
 export default OpModules;
 `;
-    fs.writeFile(
+    fs.writeFileSync(
         path.join(dir, `modules/${module}.mjs`),
-        code,
-        err => {
-            if (err) {
-                console.error(err);
-                process.exit(1);
-            }
-        }
+        code
     );
+    console.log(`Written ${module} module`); 
 }
 
 
@@ -143,16 +137,11 @@ opModulesCode += `);
 export default OpModules;
 `;
 
-fs.writeFile(
+fs.writeFileSync(
     path.join(dir, "modules/OpModules.mjs"),
-    opModulesCode,
-    err => {
-        if (err) {
-            console.error(err);
-            process.exit(1);
-        }
-    }
+    opModulesCode
 );
+console.log("Written OpModules.mjs");
 
 
     /*"Fork": {

src/core/config/scripts/generateOpsIndex.mjs

@@ -57,3 +57,4 @@ fs.writeFileSync(
     path.join(dir, "../operations/index.mjs"),
     code
 );
+console.log("Written operation index.");

webpack.config.js

@@ -1,6 +1,6 @@
 const webpack = require("webpack");
 const ExtractTextPlugin = require("extract-text-webpack-plugin");
-const WebpackShellPlugin = require("webpack-shell-plugin");
+const WebpackSyncShellPlugin = require("webpack-synchronizable-shell-plugin");
 
 /**
  * Webpack configuration details for use with Grunt.
@@ -44,11 +44,16 @@ module.exports = {
             entryOnly: true
         }),
         new ExtractTextPlugin("styles.css"),
-        new WebpackShellPlugin({
-            onBuildStart: [
-                "node --experimental-modules src/core/config/scripts/generateOpsIndex.mjs",
-                "node --experimental-modules src/core/config/scripts/generateConfig.mjs",
-            ],
+        new WebpackSyncShellPlugin({
+            onBuildStart: {
+                scripts: [
+                    "node --experimental-modules src/core/config/scripts/generateOpsIndex.mjs",
+                    "node --experimental-modules src/core/config/scripts/generateConfig.mjs",
+                    "echo ---\nConfig scripts finished.\n---\n"
+                ],
+                blocking: true,
+                parallel: false
+            }
         })
     ],
     resolve: {