action-install-latest-npm-yml.hbs

name: 'Install Latest npm'
description: 'Install the latest version of npm compatible with the Node version'
inputs:
  node:
    description: 'Current Node version'
    required: true
runs:
  using: "composite"
  steps:
    # node 10/12/14 ship with npm@6, which is known to fail when updating itself in windows
    - name: Update Windows npm
      if: |
        runner.os == 'Windows' && (
          startsWith(inputs.node, 'v10.') ||
          startsWith(inputs.node, 'v12.') ||
          startsWith(inputs.node, 'v14.')
        )
      shell: cmd
      run: |
        curl -sO https://registry.npmjs.org/npm/-/npm-7.5.4.tgz
        tar xf npm-7.5.4.tgz
        cd package
        node lib/npm.js install --no-fund --no-audit -g ..\npm-7.5.4.tgz
        cd ..
        rmdir /s /q package
    - name: Install Latest npm
      shell: bash
      env:
        NODE_VERSION: $\{{ inputs.node }}
      working-directory: $\{{ runner.temp }}
      run: |
        MATCH=""
        SPECS=("latest" "next-10" "next-9" "next-8" "next-7" "next-6")

        echo "node@$NODE_VERSION"

        for SPEC in ${SPECS[@]}; do
          ENGINES=$(npm view npm@$SPEC --json | jq -r '.engines.node')
          echo "Checking if node@$NODE_VERSION satisfies npm@$SPEC ($ENGINES)"

          if npx semver -r "$ENGINES" "$NODE_VERSION" > /dev/null; then
            MATCH=$SPEC
            echo "Found compatible version: npm@$MATCH"
            break
          fi
        done

        if [ -z $MATCH ]; then
          echo "Could not find a compatible version of npm for node@$NODE_VERSION"
          exit 1
        fi

        npm i --prefer-online --no-fund --no-audit -g npm@$MATCH
    - name: npm Version
      shell: bash
      run: npm -v