INNER CODE UNIT · TypeScript

setContext

apollographql/apollo-link · packages/apollo-link-context/src/index.ts:14

export function setContext(setter: ContextSetter): ApolloLink {
  return new ApolloLink((operation: Operation, forward: NextLink) => {
    const { ...request } = operation;

    return new Observable(observer => {
      let handle;
      Promise.resolve(request)
        .then(req => setter(req, operation.getContext()))
        .then(operation.setContext)
        .then(() => {
          handle = forward(operation).subscribe({
            next: observer.next.bind(observer),
            error: observer.error.bind(observer),
            complete: observer.complete.bind(observer),
          });
        })
        .catch(observer.error.bind(observer));

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