graphql-lazy-executor
v1.0.1
Published
This executor pre validate and parse the query and returns a function to execute it.
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GraphQL Lazy Executor
This executor pre validate and parse the query and returns a function which once executed, it returns a RxJS Observable with the result. Useful in high performance scenarios, once the query can be pre validated and parsed, and postpone the execution.
Api
lazyExecutor(
schema: GraphQLSchema,
requestString: string,
customValidators?: GraphQLValidator | Array<GraphQLValidator>
customExecutor?: function(/* args like http://graphql.org/graphql-js/execution/#execute*/): MaybePromise<ExecutionResult>;
Sample
const {
GraphQLSchema,
GraphQLObjectType,
GraphQLString,
GraphQLInt
} = require('graphql');
const lazyExecutor = require('graphql-lazy-executor');
const schema = new GraphQLSchema({
query: new GraphQLObjectType({
name: 'Query',
fields: {
name: {
type: GraphQLString,
args: {
age: {
type: GraphQLInt
}
},
resolve: (root, {
age
}, context, info) => {
callback(root, context);
return age ? `${root.name} - ${age}` : root.name;
}
},
dog: {
type: GraphQLString,
args: {
age: {
type: GraphQLInt
}
},
resolve: (root, {
age
}, context, info) => {
return age ? `${root.dog} - ${age}` : root.dog;
}
}
}
}),
});
const nameDogQuery = lazyExecutor({
schema,
source: `{name, dog}`
});
nameDogQuery({
contextValue: {
contextValue: 'contextValue'
},
rootValue: {
name: 'Rohde',
dog: 'Heron'
},
variableValues: {
variableValues: 'variableValues'
}
})
.then(console.log);
// will print
{
data: {
name: 'Rohde',
dog: 'Heron'
}
}