Dynamically import xml2js with node

Author: chrisbaume

src/validation/gridsetValidator.ts

@@ -1,11 +1,27 @@
 /* eslint-disable @typescript-eslint/require-await */
 /* eslint-disable @typescript-eslint/no-unsafe-argument */
 /* eslint-disable @typescript-eslint/no-unsafe-return */
-import * as xml2js from 'xml2js';
 import JSZip from 'jszip';
 import { BaseValidator } from './baseValidator';
 import { ValidationResult } from './validationTypes';
-import { getFs, getPath } from '../utils/io';
+import { getFs, getNodeRequire, getPath } from '../utils/io';
+
+let cachedXml2js: typeof import('xml2js') | null = null;
+function getXml2js(): typeof import('xml2js') {
+  if (cachedXml2js) return cachedXml2js;
+  try {
+    const nodeRequire = getNodeRequire();
+    // eslint-disable-next-line @typescript-eslint/no-var-requires
+    const module = nodeRequire('xml2js') as typeof import('xml2js') & {
+      default?: typeof import('xml2js');
+    };
+    const resolved = module.default || module;
+    cachedXml2js = resolved;
+    return resolved;
+  } catch {
+    throw new Error('Validator requires Xml2js in this environment.');
+  }
+}
 
 /**
  * Validator for Grid3/Smartbox Gridset files (.gridset, .gridsetx)
@@ -39,6 +55,7 @@ export class GridsetValidator extends BaseValidator {
     // Try to parse as XML and check for gridset structure
     try {
       const contentStr = Buffer.isBuffer(content) ? content.toString('utf-8') : content;
+      const xml2js = getXml2js()
       const parser = new xml2js.Parser();
       const result = await parser.parseStringPromise(contentStr as string);
       return result && (result.gridset || result.Gridset);
@@ -105,6 +122,7 @@ export class GridsetValidator extends BaseValidator {
     let xmlObj: any = null;
     await this.add_check('xml_parse', 'valid XML', async () => {
       try {
+        const xml2js = getXml2js()
         const parser = new xml2js.Parser();
         const contentStr = content.toString('utf-8');
         xmlObj = await parser.parseStringPromise(contentStr);
@@ -153,6 +171,7 @@ export class GridsetValidator extends BaseValidator {
       } else {
         try {
           const gridsetXml = await gridsetEntry.async('string');
+          const xml2js = getXml2js()
           const parser = new xml2js.Parser();
           const xmlObj = await parser.parseStringPromise(gridsetXml);
           const gridset = xmlObj.gridset || xmlObj.Gridset;
@@ -175,6 +194,7 @@ export class GridsetValidator extends BaseValidator {
       } else {
         try {
           const settingsXml = await settingsEntry.async('string');
+          const xml2js = getXml2js()
           const parser = new xml2js.Parser();
           const xmlObj = await parser.parseStringPromise(settingsXml);
           const settings =