@apollo/client/link/context/index.js

A fully-featured caching GraphQL client.

import { __rest } from "tslib";
import { ApolloLink } from "../core/index.js";
import { Observable } from "../../utilities/index.js";
export function setContext(setter) {
    return new ApolloLink(function (operation, forward) {
        var request = __rest(operation, []);
        return new Observable(function (observer) {
            var handle;
            var closed = false;
            Promise.resolve(request)
                .then(function (req) { return setter(req, operation.getContext()); })
                .then(operation.setContext)
                .then(function () {
                // if the observer is already closed, no need to subscribe.
                if (closed)
                    return;
                handle = forward(operation).subscribe({
                    next: observer.next.bind(observer),
                    error: observer.error.bind(observer),
                    complete: observer.complete.bind(observer),
                });
            })
                .catch(observer.error.bind(observer));
            return function () {
                closed = true;
                if (handle)
                    handle.unsubscribe();
            };
        });
    });
}
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