Mirror: The highly customizable and versatile GraphQL client with which you add on features like normalized caching as you grow.
Spelling and grammar fixes (#872)
authored by
Michael Stramel
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docs/advanced/subscriptions.md
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docs/advanced/subscriptions.md
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In the above example, we add the `subscriptionExchange` to the `Client` with the default exchanges
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add before it. The `subscriptionExchange` is a factory that accepts additional options and returns
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the actual `Exchange` function. It does not make any assumption over the transport protocol and
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scheme that is used. Instead we need to pass a `forwardSubscription` function which is called with
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scheme that is used. Instead, we need to pass a `forwardSubscription` function which is called with
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an "enriched" _Operation_ every time the `Client` attempts to execute a GraphQL Subscription.
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When we define this function it must return an "Observable-like" object, which needs to follow the
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list for example.
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In the following example, we create a subscription that informs us of
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new messages. We will concatenate the incoming messages, so that we
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new messages. We will concatenate the incoming messages so that we
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can display all messages that have come in over the subscription across
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events.
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···
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## One-off Subscriptions
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Whe you're using subscriptions directly without `urql`'s framework bindings, you can use the `Client`'s `subscription` method for one-off subscriptions. This method is similar to the ones for mutations and subscriptions [that we've seen before on the "Core Package" page.](../concepts/core-package.md#one-off-queries-and-mutations)
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When you're using subscriptions directly without `urql`'s framework bindings, you can use the `Client`'s `subscription` method for one-off subscriptions. This method is similar to the ones for mutations and subscriptions [that we've seen before on the "Core Package" page.](../concepts/core-package.md#one-off-queries-and-mutations)
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This method will always [returns a Wonka stream](../concepts/stream-patterns.md#the-wonka-library) and doesn't have a `.toPromise()` shortcut method, since promises won't return the multiple values that a subscription may deliver. Let's convert the above example to one without framework code, as we may use subscriptions in a Node.js environment.
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