@dillonkearns/elm-graphql/examples/src/subscription/node_modules/p-is-promise/index.js

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'use strict';
module.exports = x => (
	x instanceof Promise ||
	(
		x !== null &&
		typeof x === 'object' &&
		typeof x.then === 'function' &&
		typeof x.catch === 'function'
	)
);