type-graphql
Version:
Create GraphQL schema and resolvers with TypeScript, using classes and decorators!
73 lines (72 loc) • 2.6 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.createResolversMap = void 0;
const graphql_1 = require("graphql");
function generateTypeResolver(abstractType, schema) {
if (abstractType.resolveType) {
return abstractType.resolveType;
}
const possibleObjectTypes = schema.getPossibleTypes(abstractType);
return async (source, context, info) => {
for (const objectType of possibleObjectTypes) {
if (objectType.isTypeOf && (await objectType.isTypeOf(source, context, info))) {
return objectType.name;
}
}
return undefined;
};
}
function generateFieldsResolvers(fields) {
return Object.keys(fields).reduce((fieldsMap, fieldName) => {
const field = fields[fieldName];
if (field.subscribe) {
fieldsMap[fieldName] = {
subscribe: field.subscribe,
resolve: field.resolve,
};
}
else if (field.resolve) {
fieldsMap[fieldName] = field.resolve;
}
return fieldsMap;
}, {});
}
function createResolversMap(schema) {
const typeMap = schema.getTypeMap();
return Object.keys(typeMap)
.filter(typeName => !typeName.startsWith("__"))
.reduce((resolversMap, typeName) => {
const type = typeMap[typeName];
if (type instanceof graphql_1.GraphQLObjectType) {
resolversMap[typeName] = {
...(type.isTypeOf && {
__isTypeOf: type.isTypeOf,
}),
...generateFieldsResolvers(type.getFields()),
};
}
if (type instanceof graphql_1.GraphQLInterfaceType) {
resolversMap[typeName] = {
__resolveType: generateTypeResolver(type, schema),
...generateFieldsResolvers(type.getFields()),
};
}
if (type instanceof graphql_1.GraphQLScalarType) {
resolversMap[typeName] = type;
}
if (type instanceof graphql_1.GraphQLEnumType) {
const enumValues = type.getValues();
resolversMap[typeName] = enumValues.reduce((enumMap, { name, value }) => {
enumMap[name] = value;
return enumMap;
}, {});
}
if (type instanceof graphql_1.GraphQLUnionType) {
resolversMap[typeName] = {
__resolveType: generateTypeResolver(type, schema),
};
}
return resolversMap;
}, {});
}
exports.createResolversMap = createResolversMap;