Function checkNoopEngine

packages/styletron-react/src/index.tsx:115–138

(engine: StandardEngine)

};

function checkNoopEngine(engine: StandardEngine) {
  // if no engine provided, we default to no-op, handy for tests
  // however, print a warning in other envs
  if (process.env.NODE_ENV !== "test") {
    engine === noopEngine &&
      // eslint-disable-next-line no-console
      console.warn(
        __DEV__
          ? `
Styletron has been switched to a no-op (test) mode.

A Styletron styled component was rendered, but no Styletron engine instance was provided in React context.

Did you forget to provide a Styletron engine instance to React context via using the Styletron provider component?

Note: Providers and Consumers must come from the exact same React.createContext call to work.
If your app has multiple instances of the "styletron-react" package in your node_module tree,
your Provider may be coming from a different React.createContext call, which means the styled components
will not recieve the provided engine instance. This scenario can arise, for example, when using "npm link".
`
          : `Styletron Provider is not set up. Defaulting to no-op.`,
      );
  }
}

export function useStyletron(): [(style: StyleObject) => string] {
  const styletronEngine: StandardEngine = React.useContext(StyletronContext);