fix(packager): fix resolving of afterCopy and afterExtract hook paths

src/api/package.js

@@ -12,6 +12,7 @@ import getForgeConfig from '../util/forge-config';
 import packagerCompileHook from '../util/compile-hook';
 import readPackageJSON from '../util/read-package-json';
 import rebuildHook from '../util/rebuild';
+import requireSearch from '../util/require-search';
 import resolveDir from '../util/resolve-dir';
 
 const d = debug('electron-forge:packager');
@@ -81,10 +82,10 @@ export default async (providedOptions = {}) => {
       packagerSpinner = ora.ora('Packaging Application').start();
       done();
     }].concat(forgeConfig.electronPackagerConfig.afterCopy ? forgeConfig.electronPackagerConfig.afterCopy.map(item =>
-      (typeof item === 'string' ? require(item) : item)
+      (typeof item === 'string' ? requireSearch(dir, [item]) : item)
     ) : []),
     afterExtract: forgeConfig.electronPackagerConfig.afterExtract ? forgeConfig.electronPackagerConfig.afterExtract.map(item =>
-      (typeof item === 'string' ? require(item) : item)
+      (typeof item === 'string' ? requireSearch(dir, [item]) : item)
     ) : [],
     dir,
     arch,

src/util/require-search.js

@@ -1,13 +1,22 @@
+import debug from 'debug';
 import path from 'path';
 
+const d = debug('electron-forge:require-search');
+
 export default (relativeTo, paths) => {
+  const testPaths = paths
+    .concat(paths.map(mapPath => path.resolve(relativeTo, mapPath)))
+    .concat(paths.map(mapPath => path.resolve(relativeTo, 'node_modules', mapPath)));
+  d('searching', testPaths, 'relative to', relativeTo);
   let result;
-  for (const testPath of paths.concat(paths.map(mapPath => path.resolve(relativeTo, mapPath)))) {
+  for (const testPath of testPaths) {
     try {
+      d('testing', testPath);
       result = require(testPath);
       return typeof result === 'object' && result && result.default ? result.default : result;
     } catch (err) {
       // Ignore the error
     }
   }
+  d('failed to find a module in', testPaths);
 };