@electron-forge/maker-squirrel/src/MakerSquirrel.ts

import MakerBase, { MakerOptions } from '@electron-forge/maker-base';
import { ForgePlatform } from '@electron-forge/shared-types';

import { convertVersion, createWindowsInstaller, Options as ElectronWinstallerOptions } from 'electron-winstaller';
import fs from 'fs-extra';
import path from 'path';

type MakerSquirrelConfig = Omit<ElectronWinstallerOptions, 'appDirectory' | 'outputDirectory'>;

export default class MakerSquirrel extends MakerBase<MakerSquirrelConfig> {
  name = 'squirrel';

  defaultPlatforms: ForgePlatform[] = ['win32'];

  isSupportedOnCurrentPlatform(): boolean {
    return this.isInstalled('electron-winstaller') && !process.env.DISABLE_SQUIRREL_TEST;
  }

  async make({ dir, makeDir, targetArch, packageJSON, appName, forgeConfig }: MakerOptions): Promise<string[]> {
    const outPath = path.resolve(makeDir, `squirrel.windows/${targetArch}`);
    await this.ensureDirectory(outPath);

    const winstallerConfig: ElectronWinstallerOptions = {
      name: packageJSON.name,
      title: appName,
      noMsi: true,
      exe: `${forgeConfig.packagerConfig.executableName || appName}.exe`,
      setupExe: `${appName}-${packageJSON.version} Setup.exe`,
      ...this.config,
      appDirectory: dir,
      outputDirectory: outPath,
    };

    await createWindowsInstaller(winstallerConfig);

    const nupkgVersion = convertVersion(packageJSON.version);

    const artifacts = [
      path.resolve(outPath, 'RELEASES'),
      path.resolve(outPath, winstallerConfig.setupExe || `${appName}Setup.exe`),
      path.resolve(outPath, `${winstallerConfig.name}-${nupkgVersion}-full.nupkg`),
    ];
    const deltaPath = path.resolve(outPath, `${winstallerConfig.name}-${nupkgVersion}-delta.nupkg`);
    if (winstallerConfig.remoteReleases || (await fs.pathExists(deltaPath))) {
      artifacts.push(deltaPath);
    }
    const msiPath = path.resolve(outPath, winstallerConfig.setupMsi || `${appName}Setup.msi`);
    if (!winstallerConfig.noMsi && (await fs.pathExists(msiPath))) {
      artifacts.push(msiPath);
    }
    return artifacts;
  }
}