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/
schemaRecreation.ts
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/
schemaRecreation.ts
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import {
GraphQLArgument,
GraphQLArgumentConfig,
GraphQLEnumType,
GraphQLField,
GraphQLFieldConfig,
GraphQLFieldConfigArgumentMap,
GraphQLFieldConfigMap,
GraphQLFieldMap,
GraphQLInputField,
GraphQLInputFieldConfig,
GraphQLInputType,
GraphQLInputFieldConfigMap,
GraphQLInputFieldMap,
GraphQLInputObjectType,
GraphQLInterfaceType,
GraphQLList,
GraphQLNamedType,
GraphQLNonNull,
GraphQLObjectType,
GraphQLScalarType,
GraphQLType,
GraphQLUnionType,
GraphQLDirective,
Kind,
ValueNode,
getNamedType,
isNamedType,
GraphQLInt,
GraphQLFloat,
GraphQLString,
GraphQLBoolean,
GraphQLID,
} from 'graphql';
import isSpecifiedScalarType from '../isSpecifiedScalarType';
import { ResolveType } from '../Interfaces';
import resolveFromParentTypename from './resolveFromParentTypename';
import defaultMergedResolver from './defaultMergedResolver';
import { isStub } from './typeFromAST';
import {
serializeInputValue,
parseInputValue,
parseInputValueLiteral
} from '../transformInputValue';
export function recreateType(
type: GraphQLNamedType,
resolveType: ResolveType<any>,
keepResolvers: boolean,
): GraphQLNamedType {
if (type instanceof GraphQLObjectType) {
const fields = type.getFields();
const interfaces = type.getInterfaces();
return new GraphQLObjectType({
name: type.name,
description: type.description,
astNode: type.astNode,
isTypeOf: keepResolvers ? type.isTypeOf : undefined,
fields: () =>
fieldMapToFieldConfigMap(fields, resolveType, keepResolvers),
interfaces: () => interfaces.map(iface => resolveType(iface)),
});
} else if (type instanceof GraphQLInterfaceType) {
const fields = type.getFields();
return new GraphQLInterfaceType({
name: type.name,
description: type.description,
astNode: type.astNode,
fields: () =>
fieldMapToFieldConfigMap(fields, resolveType, keepResolvers),
resolveType: keepResolvers
? type.resolveType
: (parent, context, info) =>
resolveFromParentTypename(parent, info.schema),
});
} else if (type instanceof GraphQLUnionType) {
return new GraphQLUnionType({
name: type.name,
description: type.description,
astNode: type.astNode,
types: () => type.getTypes().map(unionMember => resolveType(unionMember)),
resolveType: keepResolvers
? type.resolveType
: (parent, context, info) =>
resolveFromParentTypename(parent, info.schema),
});
} else if (type instanceof GraphQLInputObjectType) {
return new GraphQLInputObjectType({
name: type.name,
description: type.description,
astNode: type.astNode,
fields: () =>
inputFieldMapToFieldConfigMap(type.getFields(), resolveType),
});
} else if (type instanceof GraphQLEnumType) {
const values = type.getValues();
const newValues = {};
values.forEach(value => {
newValues[value.name] = {
value: value.value,
deprecationReason: value.deprecationReason,
description: value.description,
astNode: value.astNode,
};
});
return new GraphQLEnumType({
name: type.name,
description: type.description,
astNode: type.astNode,
values: newValues,
});
} else if (type instanceof GraphQLScalarType) {
if (isSpecifiedScalarType(type)) {
return type;
} else {
return new GraphQLScalarType({
name: type.name,
description: type.description,
astNode: type.astNode,
serialize: type.serialize ? type.serialize : (value: any) => value,
parseValue: type.parseValue ? type.parseValue : (value: any) => value,
parseLiteral: type.parseLiteral ? type.parseLiteral : (ast: any) => parseLiteral(ast),
});
}
} else {
throw new Error(`Invalid type ${type}`);
}
}
export function recreateDirective(
directive: GraphQLDirective,
resolveType: ResolveType<any>,
): GraphQLDirective {
return new GraphQLDirective({
name: directive.name,
description: directive.description,
locations: directive.locations,
args: argsToFieldConfigArgumentMap(directive.args, resolveType),
astNode: directive.astNode,
});
}
function parseLiteral(ast: ValueNode): any {
switch (ast.kind) {
case Kind.STRING:
case Kind.BOOLEAN: {
return ast.value;
}
case Kind.INT:
case Kind.FLOAT: {
return parseFloat(ast.value);
}
case Kind.OBJECT: {
const value = Object.create(null);
ast.fields.forEach(field => {
value[field.name.value] = parseLiteral(field.value);
});
return value;
}
case Kind.LIST: {
return ast.values.map(parseLiteral);
}
default:
return null;
}
}
export function fieldMapToFieldConfigMap(
fields: GraphQLFieldMap<any, any>,
resolveType: ResolveType<any>,
keepResolvers: boolean,
): GraphQLFieldConfigMap<any, any> {
const result: GraphQLFieldConfigMap<any, any> = {};
Object.keys(fields).forEach(name => {
const field = fields[name];
const type = resolveType(field.type);
if (type !== null) {
result[name] = fieldToFieldConfig(
fields[name],
resolveType,
keepResolvers,
);
}
});
return result;
}
export function createResolveType(
getType: (name: string, type: GraphQLType) => GraphQLType | null,
): ResolveType<any> {
const resolveType = <T extends GraphQLType>(type: T): T | GraphQLType => {
if (type instanceof GraphQLList) {
const innerType = resolveType(type.ofType);
if (innerType === null) {
return null;
} else {
return new GraphQLList(innerType) as T;
}
} else if (type instanceof GraphQLNonNull) {
const innerType = resolveType(type.ofType);
if (innerType === null) {
return null;
} else {
return new GraphQLNonNull(innerType) as T;
}
} else if (isNamedType(type)) {
const typeName = getNamedType(type).name;
switch (typeName) {
case GraphQLInt.name:
return GraphQLInt;
case GraphQLFloat.name:
return GraphQLFloat;
case GraphQLString.name:
return GraphQLString;
case GraphQLBoolean.name:
return GraphQLBoolean;
case GraphQLID.name:
return GraphQLID;
default:
return getType(typeName, type);
}
} else {
return type;
}
};
return resolveType;
}
export function fieldToFieldConfig(
field: GraphQLField<any, any>,
resolveType: ResolveType<any>,
keepResolvers: boolean,
): GraphQLFieldConfig<any, any> {
return {
type: resolveType(field.type),
args: argsToFieldConfigArgumentMap(field.args, resolveType),
resolve: keepResolvers ? field.resolve : defaultMergedResolver,
subscribe: keepResolvers ? field.subscribe : null,
description: field.description,
deprecationReason: field.deprecationReason,
astNode: field.astNode,
};
}
export function argsToFieldConfigArgumentMap(
args: Array<GraphQLArgument>,
resolveType: ResolveType<any>,
): GraphQLFieldConfigArgumentMap {
const result: GraphQLFieldConfigArgumentMap = {};
args.forEach(arg => {
const newArg = argumentToArgumentConfig(arg, resolveType);
if (newArg) {
result[newArg[0]] = newArg[1];
}
});
return result;
}
export function argumentToArgumentConfig(
argument: GraphQLArgument,
resolveType: ResolveType<any>,
): [string, GraphQLArgumentConfig] | null {
const type = resolveType(argument.type);
if (type === null) {
return null;
} else {
return [
argument.name,
{
type,
defaultValue: reparseDefaultValue(argument.defaultValue, argument.type, type),
description: argument.description,
astNode: argument.astNode,
},
];
}
}
export function inputFieldMapToFieldConfigMap(
fields: GraphQLInputFieldMap,
resolveType: ResolveType<any>,
): GraphQLInputFieldConfigMap {
const result: GraphQLInputFieldConfigMap = {};
Object.keys(fields).forEach(name => {
const field = fields[name];
const type = resolveType(field.type);
if (type !== null) {
result[name] = inputFieldToFieldConfig(fields[name], resolveType);
}
});
return result;
}
export function inputFieldToFieldConfig(
field: GraphQLInputField,
resolveType: ResolveType<any>,
): GraphQLInputFieldConfig {
const type = resolveType(field.type);
return {
type,
defaultValue: reparseDefaultValue(field.defaultValue, field.type, type),
description: field.description,
astNode: field.astNode,
};
}
function reparseDefaultValue(
originalDefaultValue: any,
originalType: GraphQLInputType,
newType: GraphQLInputType,
) {
if (originalType instanceof GraphQLInputObjectType && isStub(originalType)) {
return parseInputValueLiteral(newType, originalDefaultValue);
}
return parseInputValue(newType, serializeInputValue(originalType, originalDefaultValue));
}