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visitSchema.ts
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visitSchema.ts
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import {
GraphQLEnumType,
GraphQLInputObjectType,
GraphQLInterfaceType,
GraphQLObjectType,
GraphQLScalarType,
GraphQLSchema,
GraphQLType,
GraphQLUnionType,
GraphQLNamedType,
isNamedType,
getNamedType,
} from 'graphql';
import { recreateType, createResolveType } from '../stitching/schemaRecreation';
export enum VisitSchemaKind {
TYPE = 'VisitSchemaKind.TYPE',
SCALAR_TYPE = 'VisitSchemaKind.SCALAR_TYPE',
ENUM_TYPE = 'VisitSchemaKind.ENUM_TYPE',
COMPOSITE_TYPE = 'VisitSchemaKind.COMPOSITE_TYPE',
OBJECT_TYPE = 'VisitSchemaKind.OBJECT_TYPE',
INPUT_OBJECT_TYPE = 'VisitSchemaKind.INPUT_OBJECT_TYPE',
ABSTRACT_TYPE = 'VisitSchemaKind.ABSTRACT_TYPE',
UNION_TYPE = 'VisitSchemaKind.UNION_TYPE',
INTERFACE_TYPE = 'VisitSchemaKind.INTERFACE_TYPE',
ROOT_OBJECT = 'VisitSchemaKind.ROOT_OBJECT',
QUERY = 'VisitSchemaKind.QUERY',
MUTATION = 'VisitSchemaKind.MUTATION',
SUBSCRIPTION = 'VisitSchemaKind.SUBSCRIPTION',
}
// I couldn't make keys to be forced to be enum values
export type SchemaVisitor = { [key: string]: TypeVisitor };
export type TypeVisitor = (
type: GraphQLType,
schema: GraphQLSchema,
) => GraphQLNamedType | null | undefined;
export function visitSchema(
schema: GraphQLSchema,
visitor: SchemaVisitor,
stripResolvers?: boolean,
) {
const types = {};
const resolveType = createResolveType(name => {
if (typeof types[name] === 'undefined') {
throw new Error(`Can't find type ${name}.`);
}
return types[name];
});
const queryType = schema.getQueryType();
const mutationType = schema.getMutationType();
const subscriptionType = schema.getSubscriptionType();
const typeMap = schema.getTypeMap();
Object.keys(typeMap).map((typeName: string) => {
const type = typeMap[typeName];
if (isNamedType(type) && getNamedType(type).name.slice(0, 2) !== '__') {
const specifiers = getTypeSpecifiers(type, schema);
const typeVisitor = getVisitor(visitor, specifiers);
if (typeVisitor) {
const result = typeVisitor(
type,
schema,
);
if (typeof result === 'undefined') {
types[typeName] = recreateType(type, resolveType, !stripResolvers);
} else if (result === null) {
types[typeName] = null;
} else {
types[typeName] = recreateType(result, resolveType, !stripResolvers);
}
} else {
types[typeName] = recreateType(type, resolveType, !stripResolvers);
}
}
});
return new GraphQLSchema({
query: queryType ? (types[queryType.name] as GraphQLObjectType) : null,
mutation: mutationType
? (types[mutationType.name] as GraphQLObjectType)
: null,
subscription: subscriptionType
? (types[subscriptionType.name] as GraphQLObjectType)
: null,
types: Object.keys(types).map(name => types[name]),
});
}
function getTypeSpecifiers(
type: GraphQLType,
schema: GraphQLSchema,
): Array<VisitSchemaKind> {
const specifiers = [VisitSchemaKind.TYPE];
if (type instanceof GraphQLObjectType) {
specifiers.unshift(
VisitSchemaKind.COMPOSITE_TYPE,
VisitSchemaKind.OBJECT_TYPE,
);
const query = schema.getQueryType();
const mutation = schema.getMutationType();
const subscription = schema.getSubscriptionType();
if (type === query) {
specifiers.push(VisitSchemaKind.ROOT_OBJECT, VisitSchemaKind.QUERY);
} else if (type === mutation) {
specifiers.push(VisitSchemaKind.ROOT_OBJECT, VisitSchemaKind.MUTATION);
} else if (type === subscription) {
specifiers.push(
VisitSchemaKind.ROOT_OBJECT,
VisitSchemaKind.SUBSCRIPTION,
);
}
} else if (type instanceof GraphQLInputObjectType) {
specifiers.push(VisitSchemaKind.INPUT_OBJECT_TYPE);
} else if (type instanceof GraphQLInterfaceType) {
specifiers.push(
VisitSchemaKind.COMPOSITE_TYPE,
VisitSchemaKind.ABSTRACT_TYPE,
VisitSchemaKind.INTERFACE_TYPE,
);
} else if (type instanceof GraphQLUnionType) {
specifiers.push(
VisitSchemaKind.COMPOSITE_TYPE,
VisitSchemaKind.ABSTRACT_TYPE,
VisitSchemaKind.UNION_TYPE,
);
} else if (type instanceof GraphQLEnumType) {
specifiers.push(VisitSchemaKind.ENUM_TYPE);
} else if (type instanceof GraphQLScalarType) {
specifiers.push(VisitSchemaKind.SCALAR_TYPE);
}
return specifiers;
}
function getVisitor(
visitor: SchemaVisitor,
specifiers: Array<VisitSchemaKind>,
): TypeVisitor | null {
let typeVisitor = null;
const stack = [...specifiers];
while (!typeVisitor && stack.length > 0) {
const next = stack.pop();
typeVisitor = visitor[next];
}
return typeVisitor;
}