This package allows you to do basically whatever you want with the resolvers.
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Installation
yarn add @kiwicom/graphql-resolve-wrapper
Usage
Note: this function mutates the GraphQL schema (it replaces the resolve
function).
const Schema = new GraphQLSchema({
query: RootQuery,
mutation: RootMutation,
});
wrapResolvers(Schema, resolveFn => async (...args) => {
const value = await resolveFn(...args);
return typeof value === 'string' ? value.toUpperCase() : value;
});
export default Schema;
This wrapper would uppercase every string in the response. There are of course more interesting and practical use-cases:
- error masking (wrap in
try/catch
and mask only server-side errors) - timing (measure duration of every resolver)
- custom
resolve
function behavior
The simplest resolver wrapper is this (it just calls the resolver):
function defaultWrapper(resolveFn) {
return (...args) => resolveFn(...args);
}
Query Timing (advanced example)
Query:
query Test($search: String!) {
allLocations(first: 10, search: $search) {
edges {
node {
id
name
}
}
}
}
Wrapper:
wrapResolvers(Schema, resolveFn => async (ancestor, args, context, info) => {
const startAt = process.hrtime.bigint();
const response = await resolveFn(ancestor, args, context, info);
console.warn(process.hrtime.bigint() - startAt, JSON.stringify(info.path));
return response;
});
Output:
567425567n '{"key":"allLocations"}'
301331n '{"prev":{"prev":{"prev":{"prev":{"key":"allLocations"},"key":"edges"},"key":0},"key":"node"},"key":"id"}'
250083n '{"prev":{"prev":{"prev":{"prev":{"key":"allLocations"},"key":"edges"},"key":0},"key":"node"},"key":"name"}'
237656n '{"prev":{"prev":{"prev":{"prev":{"key":"allLocations"},"key":"edges"},"key":1},"key":"node"},"key":"id"}'
262972n '{"prev":{"prev":{"prev":{"prev":{"key":"allLocations"},"key":"edges"},"key":1},"key":"node"},"key":"name"}'
280750n '{"prev":{"prev":{"prev":{"prev":{"key":"allLocations"},"key":"edges"},"key":2},"key":"node"},"key":"id"}'
305839n '{"prev":{"prev":{"prev":{"prev":{"key":"allLocations"},"key":"edges"},"key":2},"key":"node"},"key":"name"}'
325893n '{"prev":{"prev":{"prev":{"prev":{"key":"allLocations"},"key":"edges"},"key":3},"key":"node"},"key":"id"}'
351468n '{"prev":{"prev":{"prev":{"prev":{"key":"allLocations"},"key":"edges"},"key":3},"key":"node"},"key":"name"}'