Example snippet of NpmExecutor

npm-exec.java

NpmExecutor npmShellExecutor = NpmExecutorExecutionContextView.view(ctx).getNpmExecutor().withConfigurationDirectory(dir);
npmShellExecutor.init();

command.replaceAll(s -> s
        .replace("${nodeModules}", nodeModules.toString())
        .replace("${repoDir}", ".")
        .replace("${parser}", acc.parser()));

String angularCliVersion = getAngularCliPackage(acc, ctx);
String npmrcPath = new File(dir.toString(), ".npmrc").getAbsolutePath();
List<String> installNodeGypAndNan = new ArrayList<>(Arrays.asList("npm", "install", "--userconfig", npmrcPath, "--prefix", nodeModules.toString(), "--force", "--ignore-script", "node-gyp@10", "nan@2"));
List<String> prefixedInstallAngularCli = new ArrayList<>(Arrays.asList("npm", "install", "--userconfig", npmrcPath, "--prefix", nodeModules.toString(), "--force", "--ignore-scripts", angularCliVersion));
List<String> localNpmInstallCommand = new ArrayList<>(Arrays.asList("npm", "install", "--force", "--ignore-scripts"));

try {
    if (useNvmExec) {
        installNodeGypAndNan.add(0, "nvm-exec");
        prefixedInstallAngularCli.add(0, "nvm-exec");
        localNpmInstallCommand.add(0, "nvm-exec");
        command.add(0, "nvm-exec");
    }

    Map<String, String> environment = new HashMap<>();
    environment.put("NG_DISABLE_VERSION_CHECK", "1");
    environment.put("NG_CLI_ANALYTICS", "false");
    environment.put("NODE_OPTIONS", "--max-old-space-size=2048");
    environment.put("NODE_PATH", nodeModules.toString());
    environment.put("TERM", "dumb");

    // Install node-gyp to avoid issues with `npx`
    npmShellExecutor.exec(installNodeGypAndNan, dir, environment, ctx);
    // install angular cli in the project
    npmShellExecutor.exec(prefixedInstallAngularCli, dir, environment, ctx);
    // install the project dependencies
    npmShellExecutor.exec(localNpmInstallCommand, dir, environment, ctx);

    // run `ng update` command
    Path out = npmShellExecutor.exec(command, dir, environment, ctx);

    for (Map.Entry<Path, Long> entry : acc.beforeModificationTimestamps.entrySet()) {
        Path path = entry.getKey();
        if (!Files.exists(path) || Files.getLastModifiedTime(path).toMillis() > entry.getValue()) {
            acc.modified(path);
        }
    }
    processOutput(out, acc, ctx);
} catch (IOException e) {
    throw new RuntimeException(e);
} finally {
    // Restore npm settings
    npmShellExecutor.postExec();
}