How to specify node and npm version for the current project, using .npmrc and .nvmrc

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You need two files to specify and restrict to use of the proper version of npm and node.

.npmrc

engine-strict=true

package.json

"engines": {
  "node": ">= 8.9.4 < 15.0",
  "npm": ">= 5.6.0"
}