Add support for configuring npm version in Node devcontainers

src/node/devcontainer-feature.json

@@ -27,6 +27,22 @@
             "default": "/usr/local/share/nvm",
             "description": "The path where NVM will be installed."
         },
+        "npmVersion": {
+            "type": "string",
+            "proposals": [
+                "lts",
+                "latest",
+                "10.9.0",
+                "10.8.0",
+                "10.7.0",
+                "9.9.3",
+                "8.19.4",
+                "latest",
+                "none"
+            ],
+            "default": "10.9.0",
+            "description": "Select or enter a specific NPM version to install globally. Use 'latest' for the latest version, 'none' to skip npm version update, or specify a version like '10.9.0'."
+        },
         "pnpmVersion": {
             "type": "string",
             "proposals": [
@@ -78,4 +94,4 @@
     "installsAfter": [
         "ghcr.io/devcontainers/features/common-utils"
     ]
-}
+}

src/node/install.sh

@@ -8,6 +8,7 @@
 # Maintainer: The Dev Container spec maintainers
 
 export NODE_VERSION="${VERSION:-"lts"}"
+export NPM_VERSION="${NPMVERSION:-"lts"}"
 export PNPM_VERSION="${PNPMVERSION:-"latest"}"
 export NVM_VERSION="${NVMVERSION:-"latest"}"
 export NVM_DIR="${NVMINSTALLPATH:-"/usr/local/share/nvm"}"
@@ -381,6 +382,41 @@ if [ ! -z "${ADDITIONAL_VERSIONS}" ]; then
     IFS=$OLDIFS
 fi
 
+# Install or update npm to specific version
+if [ ! -z "${NPM_VERSION}" ] && [ "${NPM_VERSION}" = "none" ]; then
+    echo "Ignoring NPM version update"
+else
+    if bash -c ". '${NVM_DIR}/nvm.sh' && type npm >/dev/null 2>&1"; then
+        (
+            . "${NVM_DIR}/nvm.sh"
+            [ ! -z "$http_proxy" ] && npm set proxy="$http_proxy"
+            [ ! -z "$https_proxy" ] && npm set https-proxy="$https_proxy"
+            [ ! -z "$no_proxy" ] && npm set noproxy="$no_proxy"
+            echo "Installing npm version ${NPM_VERSION}..."
+
+            # Clear npm cache to avoid conflicts
+            npm cache clean --force 2>/dev/null || true
+
+            # Try npm installation with retries
+            for i in {1..3}; do
+                if npm install -g npm@$NPM_VERSION --force; then
+                    echo "Successfully installed npm@${NPM_VERSION}"
+                    break
+                else
+                    echo "Attempt $i failed, retrying..."
+                    sleep 2
+                    if [ $i -eq 3 ]; then
+                        echo "Failed to install npm@${NPM_VERSION} after 3 attempts. Trying latest npm as fallback..."
+                        npm install -g npm@latest --force || echo "Fallback to latest npm also failed. Keeping current npm version $(npm --version 2>/dev/null || echo 'unknown')."
+                    fi
+                fi
+            done
+        )
+    else
+        echo "Skip installing/updating npm because npm is not available"
+    fi
+fi
+
 # Install pnpm
 if [ ! -z "${PNPM_VERSION}" ] && [ "${PNPM_VERSION}" = "none" ]; then
     echo "Ignoring installation of PNPM"

test/node/install_npm_latest.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+set -e
+
+# Optional: Import test library
+source dev-container-features-test-lib
+
+# Verify npm is latest version (valid version format)
+check "npm_latest_version" bash -c "npm -v | grep -E '^[0-9]+\.[0-9]+\.[0-9]+'"
+
+# Also verify pnpm works as configured
+check "pnpm_version" bash -c "pnpm -v | grep 8.8.0"
+
+# Report result
+reportResults

test/node/install_npm_none.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+set -e
+
+# Optional: Import test library
+source dev-container-features-test-lib
+
+# When npmVersion is "none", npm should not be updated from node's bundled version
+check "npm_not_updated" bash -c "npm --version"
+
+# Report result
+reportResults

test/node/install_specific_npm_version.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+set -e
+
+# Optional: Import test library
+source dev-container-features-test-lib
+
+# Verify npm is installed with specific version 10.8.0
+check "npm_specific_version" bash -c "npm -v | grep '^10.8.0'"
+
+# Report result
+reportResults

test/node/scenarios.json

@@ -6,23 +6,23 @@
                 "version": "lts"
             }
         }
-    },    
+    },
     "install_node_debian_bookworm": {
         "image": "debian:12",
         "features": {
             "node": {
                 "version": "lts"
             }
         }
-    },    
+    },
     "nvm_test_fallback": {
         "image": "debian:11",
         "features": {
             "node": {
                 "version": "lts"
             }
         }
-    },    
+    },
     "install_additional_node": {
         "image": "debian:11",
         "features": {
@@ -98,7 +98,7 @@
         "features": {
             "node": {
                 "version": "22",
-                "pnpmVersion":"8.8.0"
+                "pnpmVersion": "8.8.0"
             }
         }
     },
@@ -207,5 +207,33 @@
                 "version": "lts"
             }
         }
+    },
+    "install_specific_npm_version": {
+        "image": "debian:12",
+        "features": {
+            "node": {
+                "version": "lts",
+                "npmVersion": "10.8.0"
+            }
+        }
+    },
+    "install_npm_none": {
+        "image": "mcr.microsoft.com/devcontainers/base",
+        "features": {
+            "node": {
+                "version": "lts",
+                "npmVersion": "none"
+            }
+        }
+    },
+    "install_npm_latest": {
+        "image": "debian:12",
+        "features": {
+            "node": {
+                "version": "22",
+                "npmVersion": "latest",
+                "pnpmVersion": "8.8.0"
+            }
+        }
     }
-}
+}