The error message points to lacking configuration of the node.js version in
the package.json file. You need to set value for your node.js version with
an entry similar to:
{
"engines": {
"node": "9.x"
}
}
You may gather more detail from the "Node.js version" sub-chapter
<https://cloud.google.com/appengine/docs/flexible/nodejs/runtime#nodejs_version>
of
the "The Node.js Runtime" documentation page.
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