Switch to NodeJS LTS 20 "Iron"

NodeJS 18 "Hydrogen" will be EOL in April 2025.

Closes issue opensearch-project#8463.

Note: The latest LTS (22 "Jod") fails to build.

Signed-off-by: hashworks <[email protected]>

.node-version

@@ -1 +1 @@
-18.19.0
+20.18.1

.nvmrc

@@ -1 +1 @@
-18.19.0
+20.18.1

Dockerfile

@@ -1,4 +1,4 @@
-ARG NODE_VERSION=18.19.0
+ARG NODE_VERSION=20.18.1
 FROM node:${NODE_VERSION} AS base
 
 ENV HOME '.'

TESTING.md

@@ -27,8 +27,8 @@ In general, we recommend four tiers of tests:
 
 
 # Requirements
-* Install the latest NodeJS, [NPM](https://www.npmjs.com/get-npm) and [Yarn](https://classic.yarnpkg.com/en/docs/install/#mac-stable)
-    * `nvm install v18.19.0`
+* Install the specified NodeJS, [NPM](https://www.npmjs.com/get-npm) and [Yarn](https://classic.yarnpkg.com/en/docs/install/#mac-stable)
+    * `nvm install v20.18.1`
     * `npm install -g yarn`
 
 # Running tests
@@ -122,4 +122,4 @@ sudo apt-get install -y --allow-downgrades /tmp/chrome.deb
 Although Jest is the standard for this project, there are a few Mocha tests that still exist. You can run these tests by running:
 `yarn test:mocha`
 
-However, these tests will eventually be migrated; please avoid writing new Mocha tests. For further questions or to check the status, please see this [issue](https://github.com/opensearch-project/OpenSearch-Dashboards/issues/215).
+However, these tests will eventually be migrated; please avoid writing new Mocha tests. For further questions or to check the status, please see this [issue](https://github.com/opensearch-project/OpenSearch-Dashboards/issues/215).

package.json

@@ -503,7 +503,7 @@
     "zlib": "^1.0.5"
   },
   "engines": {
-    "node": ">=14.20.1 <19",
+    "node": ">=14.20.1 <21",
     "yarn": "^1.22.10"
   }
 }