fix: adding warning when pushing monitors from yaml files (#977)

* package.json - added dependency 'utf-8-validate'

* monitor.ts - Added validation and warnings
- Validation/warning prior to UTF-8 decoding of files
- warning when a 'browser' type monitor is ignored
- removing unused variable (causing linter error)

* Update src/push/monitor.ts

changing warning text

Co-authored-by: Vignesh Shanmugam <vignesh.shanmugam22@gmail.com>

* src/push/monitor.ts - using node standard libarary to test utf-8 encoding
- updated types@node to be more in line with current version

* Update src/push/monitor.ts - updating warning message.

Co-authored-by: Vignesh Shanmugam <vignesh.shanmugam22@gmail.com>

* fix node type and message

---------

Co-authored-by: Vignesh Shanmugam <vignesh.shanmugam22@gmail.com>

package.json

@@ -81,7 +81,7 @@
     "@types/babel__code-frame": "^7.0.3",
     "@types/jest": "^28.1.8",
     "@types/micromatch": "^4.0.9",
-    "@types/node": "^16.11.59",
+    "@types/node": "^18.19.63",
     "@types/semver": "^7",
     "@types/stack-utils": "^2.0.1",
     "@typescript-eslint/eslint-plugin": "^5.38.0",

src/push/monitor.ts

@@ -28,6 +28,7 @@ import { extname, join } from 'path';
 import { LineCounter, parseDocument, Document, YAMLSeq, YAMLMap } from 'yaml';
 import { bold, red } from 'kleur/colors';
 import { Bundler } from './bundler';
+import NodeBuffer from 'node:buffer';
 import { SYNTHETICS_PATH, totalist, indent, warn } from '../helpers';
 import { LocationsMap } from '../locations/public-locations';
 import {
@@ -184,7 +185,13 @@ export async function createLightweightMonitors(
   let warnOnce = false;
   const monitors: Monitor[] = [];
   for (const file of lwFiles.values()) {
-    const content = await readFile(file, 'utf-8');
+    // First check encoding and warn if any files are not the correct encoding.
+    const bufferContent = await readFile(file);
+    const isUtf8 = NodeBuffer.isUtf8(bufferContent);
+    if (!isUtf8) {
+      warn(`${file} is not UTF-8 encoded. Monitors might be skipped.`);
+    }
+    const content = bufferContent.toString('utf-8');
     const lineCounter = new LineCounter();
     const parsedDoc = parseDocument(content, {
       lineCounter,
@@ -218,6 +225,9 @@ export async function createLightweightMonitors(
       const monitor = mergedConfig[i];
       // Skip browser monitors from the YML files
       if (monitor['type'] === 'browser') {
+        warn(
+          `Browser monitors from ${file} are skipped.`
+        );
         continue;
       }
       const { line, col } = lineCounter.linePos(offsets[i]);