/
mergeCandidates.ts
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/
mergeCandidates.ts
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import {
GraphQLNamedType,
GraphQLObjectType,
GraphQLInterfaceType,
GraphQLUnionType,
GraphQLEnumType,
isScalarType,
isObjectType,
isInterfaceType,
isUnionType,
isEnumType,
isInputObjectType,
GraphQLFieldConfigMap,
GraphQLInputObjectType,
GraphQLInputFieldConfigMap,
ObjectTypeDefinitionNode,
InputObjectTypeDefinitionNode,
InterfaceTypeDefinitionNode,
UnionTypeDefinitionNode,
EnumTypeDefinitionNode,
GraphQLEnumValueConfigMap,
} from 'graphql';
import { mergeType, mergeInputType, mergeInterface, mergeUnion, mergeEnum } from '@graphql-tools/merge';
import { MergeTypeCandidate } from './types';
export function mergeCandidates(typeName: string, candidates: Array<MergeTypeCandidate>): GraphQLNamedType {
const initialCandidateType = candidates[0].type;
if (candidates.some(candidate => candidate.type.constructor !== initialCandidateType.constructor)) {
throw new Error(`Cannot merge different type categories into common type ${typeName}.`);
}
if (isObjectType(initialCandidateType)) {
return mergeObjectTypeCandidates(typeName, candidates);
} else if (isInputObjectType(initialCandidateType)) {
return mergeInputObjectTypeCandidates(typeName, candidates);
} else if (isInterfaceType(initialCandidateType)) {
return mergeInterfaceTypeCandidates(typeName, candidates);
} else if (isUnionType(initialCandidateType)) {
return mergeUnionTypeCandidates(typeName, candidates);
} else if (isEnumType(initialCandidateType)) {
return mergeEnumTypeCandidates(typeName, candidates);
} else if (isScalarType(initialCandidateType)) {
throw new Error(`Cannot merge type ${typeName}. Merging not supported for GraphQLScalarType.`);
} else {
// not reachable.
throw new Error(`Type ${typeName} has unknown GraphQL type.`);
}
}
function mergeObjectTypeCandidates(
typeName: string,
candidates: Array<MergeTypeCandidate>
): GraphQLObjectType<any, any> {
const descriptions = pluck<string>('description', candidates);
const lastDescription = descriptions[descriptions.length - 1];
const configs = candidates.map(candidate => (candidate.type as GraphQLObjectType).toConfig());
const fields = configs.reduce<GraphQLFieldConfigMap<any, any>>(
(acc, config) => ({
...acc,
...config.fields,
}),
{}
);
const interfaces = configs
.map(config => config.interfaces)
.reduce((acc, interfaces) => {
return interfaces != null ? acc.concat(interfaces) : acc;
}, []);
const astNodes = pluck<ObjectTypeDefinitionNode>('astNode', candidates);
const astNode = astNodes
.slice(1)
.reduce<ObjectTypeDefinitionNode>(
(acc, astNode) => mergeType(astNode, acc as ObjectTypeDefinitionNode) as ObjectTypeDefinitionNode,
astNodes[0]
);
const extensionASTNodes = [].concat(pluck<Record<string, any>>('extensionASTNodes', candidates));
const extensions = Object.assign({}, ...pluck<Record<string, any>>('extensions', candidates));
const config = {
name: typeName,
description: lastDescription,
fields,
interfaces,
astNode,
extensionASTNodes,
extensions,
};
return new GraphQLObjectType(config);
}
function mergeInputObjectTypeCandidates(
typeName: string,
candidates: Array<MergeTypeCandidate>
): GraphQLInputObjectType {
const descriptions = pluck<string>('description', candidates);
const lastDescription = descriptions[descriptions.length - 1];
const configs = candidates.map(candidate => (candidate.type as GraphQLInputObjectType).toConfig());
const fields = configs.reduce<GraphQLInputFieldConfigMap>(
(acc, config) => ({
...acc,
...config.fields,
}),
{}
);
const astNodes = pluck<InputObjectTypeDefinitionNode>('astNode', candidates);
const astNode = astNodes
.slice(1)
.reduce(
(acc, astNode) => mergeInputType(astNode, acc as InputObjectTypeDefinitionNode) as InputObjectTypeDefinitionNode,
astNodes[0]
);
const extensionASTNodes = [].concat(pluck<Record<string, any>>('extensionASTNodes', candidates));
const extensions = Object.assign({}, ...pluck<Record<string, any>>('extensions', candidates));
const config = {
name: typeName,
description: lastDescription,
fields,
astNode,
extensionASTNodes,
extensions,
};
return new GraphQLInputObjectType(config);
}
function pluck<T>(typeProperty: string, candidates: Array<MergeTypeCandidate>): Array<T> {
return candidates.map(candidate => candidate.type[typeProperty]).filter(value => value != null) as Array<T>;
}
function mergeInterfaceTypeCandidates(typeName: string, candidates: Array<MergeTypeCandidate>): GraphQLInterfaceType {
const descriptions = pluck<string>('description', candidates);
const lastDescription = descriptions[descriptions.length - 1];
const configs = candidates.map(candidate => (candidate.type as GraphQLInterfaceType).toConfig());
const fields = configs.reduce<GraphQLFieldConfigMap<any, any>>(
(acc, config) => ({
...acc,
...config.fields,
}),
{}
);
const interfaces =
'interfaces' in candidates[0].type.toConfig()
? configs
.map(config => ((config as unknown) as { interfaces: Array<GraphQLInterfaceType> }).interfaces)
.reduce((acc, interfaces) => {
return interfaces != null ? acc.concat(interfaces) : acc;
}, [])
: undefined;
const astNodes = pluck<InterfaceTypeDefinitionNode>('astNode', candidates);
const astNode = astNodes
.slice(1)
.reduce<InterfaceTypeDefinitionNode>(
(acc, astNode) => mergeInterface(astNode, acc as InterfaceTypeDefinitionNode, {}) as InterfaceTypeDefinitionNode,
astNodes[0]
);
const extensionASTNodes = [].concat(pluck<Record<string, any>>('extensionASTNodes', candidates));
const extensions = Object.assign({}, ...pluck<Record<string, any>>('extensions', candidates));
const config = {
name: typeName,
description: lastDescription,
fields,
interfaces,
astNode,
extensionASTNodes,
extensions,
};
return new GraphQLInterfaceType(config);
}
function mergeUnionTypeCandidates(typeName: string, candidates: Array<MergeTypeCandidate>): GraphQLUnionType {
const descriptions = pluck<string>('description', candidates);
const lastDescription = descriptions[descriptions.length - 1];
const configs = candidates.map(candidate => (candidate.type as GraphQLUnionType).toConfig());
const types = configs.reduce((acc, config) => acc.concat(config.types), []);
const astNodes = pluck<UnionTypeDefinitionNode>('astNode', candidates);
const astNode = astNodes
.slice(1)
.reduce<UnionTypeDefinitionNode>(
(acc, astNode) => mergeUnion(astNode, acc as UnionTypeDefinitionNode) as UnionTypeDefinitionNode,
astNodes[0]
);
const extensionASTNodes = [].concat(pluck<Record<string, any>>('extensionASTNodes', candidates));
const extensions = Object.assign({}, ...pluck<Record<string, any>>('extensions', candidates));
const config = {
name: typeName,
description: lastDescription,
types,
astNode,
extensionASTNodes,
extensions,
};
return new GraphQLUnionType(config);
}
function mergeEnumTypeCandidates(typeName: string, candidates: Array<MergeTypeCandidate>): GraphQLEnumType {
const descriptions = pluck<string>('description', candidates);
const lastDescription = descriptions[descriptions.length - 1];
const configs = candidates.map(candidate => (candidate.type as GraphQLEnumType).toConfig());
const values = configs.reduce<GraphQLEnumValueConfigMap>(
(acc, config) => ({
...acc,
...config.values,
}),
{}
);
const astNodes = pluck<EnumTypeDefinitionNode>('astNode', candidates);
const astNode = astNodes
.slice(1)
.reduce<EnumTypeDefinitionNode>(
(acc, astNode) => mergeEnum(astNode, acc as EnumTypeDefinitionNode) as EnumTypeDefinitionNode,
astNodes[0]
);
const extensionASTNodes = [].concat(pluck<Record<string, any>>('extensionASTNodes', candidates));
const extensions = Object.assign({}, ...pluck<Record<string, any>>('extensions', candidates));
const config = {
name: typeName,
description: lastDescription,
values,
astNode,
extensionASTNodes,
extensions,
};
return new GraphQLEnumType(config);
}