feat(demand-control): allow `maxCost` to accept a dynamic function by Copilot · Pull Request #2133 · graphql-hive/gateway

Copilot · 2026-03-19T21:40:51Z

Precompute maxCostFn at plugin initialization (done in previous session)
Add changeset (done in previous session)
Fix ESLint: remove invalid @typescript-eslint/no-explicit-any disable comment from useDemandControl.ts
Fix Prettier: reorder imports in useDemandControl.ts (@whatwg-node → ~internal/env → graphql)
Fix Prettier: reformat maxCost?: union type to multi-line in useDemandControl.ts
Fix Prettier: collapse multi-line import of DemandControlPluginOptions to single line in types.ts
Fix Prettier: move export type { DemandControlMaxCostPayload } after all imports in types.ts

Original prompt

This section details on the original issue you should resolve

<issue_title>Get an estimated operation cost during the onSubgraphExecute hook</issue_title>
<issue_description>Hello!

I am wondering if it is possible to access the estimatedCost before actually sending a request to a subgraph?

I see that the calculation is done during this step: https://github.com/graphql-hive/gateway/blob/main/packages/runtime/src/plugins/useDemandControl.ts#L70.

The issue is, I want to know an estimated cost before sending a request, so I can build my logic.</issue_description>

Comments on the Issue (you are @copilot in this section)
@ardatan Could you share more about your scenario? @ardatan So you need `maxCost` parameter to accept a function that returns the value based on the context, request etc.
About operationTypeCost, it is a typo in the documentation so it should be operationTypeCost not operationCost. operationTypeCost accepts the operation type. Not sure if it s bug. It looks like a mistake in the documentation.
graphql-hive/console#6914</comment_new>

Fixes Get an estimated operation cost during the onSubgraphExecute hook #1389

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…cost limiting Adds a new `DemandControlMaxCostPayload` interface and allows `maxCost` in `DemandControlPluginOptions` to accept a sync or async function that receives the `operationCost`, `totalCost`, `subgraphName`, and `executionRequest` and returns the maximum allowed cost. This lets users implement dynamic cost limiting (e.g., per-user or per-subgraph limits) and access the estimated cost before a request is sent to the subgraph. Re-exports `DemandControlMaxCostPayload` from the main package types for consumers to use when typing their `maxCost` functions. Co-authored-by: ardatan <20847995+ardatan@users.noreply.github.com>

Co-authored-by: ardatan <20847995+ardatan@users.noreply.github.com>

theguild-bot · 2026-03-20T07:25:55Z

🚀 Snapshot Release (`alpha`)

The latest changes of this PR are available as alpha on npm (based on the declared changesets):

Package	Version	Info
`@graphql-hive/gateway`	`2.5.12-alpha-bb7cb0747a2f268a4a03e2f7f7f2ccd1364ded49`	npm ↗︎ unpkg ↗︎
`@graphql-hive/nestjs`	`2.0.53-alpha-bb7cb0747a2f268a4a03e2f7f7f2ccd1364ded49`	npm ↗︎ unpkg ↗︎
`@graphql-hive/plugin-opentelemetry`	`1.4.9-alpha-bb7cb0747a2f268a4a03e2f7f7f2ccd1364ded49`	npm ↗︎ unpkg ↗︎
`@graphql-mesh/plugin-prometheus`	`2.1.28-alpha-bb7cb0747a2f268a4a03e2f7f7f2ccd1364ded49`	npm ↗︎ unpkg ↗︎
`@graphql-hive/gateway-runtime`	`2.8.0-alpha-bb7cb0747a2f268a4a03e2f7f7f2ccd1364ded49`	npm ↗︎ unpkg ↗︎
`@graphql-hive/gateway-testing`	`7.0.0-alpha-bb7cb0747a2f268a4a03e2f7f7f2ccd1364ded49`	npm ↗︎ unpkg ↗︎

theguild-bot · 2026-03-20T07:29:12Z