@graphql-codegen/typescript-resolvers/index.esm.js

import { printSchemaWithDirectives } from '@graphql-tools/utils';
import { BaseResolversVisitor, getConfigValue, parseMapper } from '@graphql-codegen/visitor-plugin-common';
import { addFederationReferencesToSchema } from '@graphql-codegen/plugin-helpers';
import { printSchema, parse, visit } from 'graphql';
import autoBind from 'auto-bind';
import { TypeScriptOperationVariablesToObject } from '@graphql-codegen/typescript';

const ENUM_RESOLVERS_SIGNATURE = 'export type EnumResolverSignature<T, AllowedValues = any> = { [key in keyof T]?: AllowedValues };';
class TypeScriptResolversVisitor extends BaseResolversVisitor {
    constructor(pluginConfig, schema) {
        super(pluginConfig, {
            avoidOptionals: getConfigValue(pluginConfig.avoidOptionals, false),
            useIndexSignature: getConfigValue(pluginConfig.useIndexSignature, false),
            wrapFieldDefinitions: getConfigValue(pluginConfig.wrapFieldDefinitions, false),
            allowParentTypeOverride: getConfigValue(pluginConfig.allowParentTypeOverride, false),
            optionalInfoArgument: getConfigValue(pluginConfig.optionalInfoArgument, false),
        }, schema);
        autoBind(this);
        this.setVariablesTransformer(new TypeScriptOperationVariablesToObject(this.scalars, this.convertName, this.config.avoidOptionals, this.config.immutableTypes, this.config.namespacedImportName, [], this.config.enumPrefix, this.config.enumValues));
        if (this.config.useIndexSignature) {
            this._declarationBlockConfig = {
                blockTransformer(block) {
                    return `ResolversObject<${block}>`;
                },
            };
        }
    }
    transformParentGenericType(parentType) {
        if (this.config.allowParentTypeOverride) {
            return `ParentType = ${parentType}`;
        }
        return `ParentType extends ${parentType} = ${parentType}`;
    }
    formatRootResolver(schemaTypeName, resolverType, declarationKind) {
        return `${schemaTypeName}${this.config.avoidOptionals ? '' : '?'}: ${resolverType}${this.getPunctuation(declarationKind)}`;
    }
    clearOptional(str) {
        if (str.startsWith('Maybe')) {
            return str.replace(/Maybe<(.*?)>$/, '$1');
        }
        return str;
    }
    ListType(node) {
        return `Maybe<${super.ListType(node)}>`;
    }
    wrapWithListType(str) {
        return `${this.config.immutableTypes ? 'ReadonlyArray' : 'Array'}<${str}>`;
    }
    getParentTypeForSignature(node) {
        if (this._federation.isResolveReferenceField(node) && this.config.wrapFieldDefinitions) {
            return 'UnwrappedObject<ParentType>';
        }
        return 'ParentType';
    }
    NamedType(node) {
        return `Maybe<${super.NamedType(node)}>`;
    }
    NonNullType(node) {
        const baseValue = super.NonNullType(node);
        return this.clearOptional(baseValue);
    }
    getPunctuation(declarationKind) {
        return ';';
    }
    buildEnumResolverContentBlock(node, mappedEnumType) {
        const valuesMap = `{ ${(node.values || [])
            .map(v => `${v.name}${this.config.avoidOptionals ? '' : '?'}: any`)
            .join(', ')} }`;
        this._globalDeclarations.add(ENUM_RESOLVERS_SIGNATURE);
        return `EnumResolverSignature<${valuesMap}, ${mappedEnumType}>`;
    }
    buildEnumResolversExplicitMappedValues(node, valuesMapping) {
        return `{ ${(node.values || [])
            .map(v => {
            const valueName = v.name;
            const mappedValue = valuesMapping[valueName];
            return `${valueName}: ${typeof mappedValue === 'number' ? mappedValue : `'${mappedValue}'`}`;
        })
            .join(', ')} }`;
    }
}

const plugin = (schema, documents, config) => {
    const imports = [];
    if (!config.customResolveInfo) {
        imports.push('GraphQLResolveInfo');
    }
    const showUnusedMappers = typeof config.showUnusedMappers === 'boolean' ? config.showUnusedMappers : true;
    const noSchemaStitching = typeof config.noSchemaStitching === 'boolean' ? config.noSchemaStitching : false;
    if (config.noSchemaStitching === false) {
        // eslint-disable-next-line no-console
        console.warn(`The default behavior of 'noSchemaStitching' will be reversed in the next major release. Support for Schema Stitching will be disabled by default.`);
    }
    const indexSignature = config.useIndexSignature
        ? [
            'export type WithIndex<TObject> = TObject & Record<string, any>;',
            'export type ResolversObject<TObject> = WithIndex<TObject>;',
        ].join('\n')
        : '';
    const transformedSchema = config.federation ? addFederationReferencesToSchema(schema) : schema;
    const visitor = new TypeScriptResolversVisitor(config, transformedSchema);
    const namespacedImportPrefix = visitor.config.namespacedImportName ? `${visitor.config.namespacedImportName}.` : '';
    const printedSchema = config.federation
        ? printSchemaWithDirectives(transformedSchema)
        : printSchema(transformedSchema);
    const astNode = parse(printedSchema);
    // runs visitor
    const visitorResult = visit(astNode, { leave: visitor });
    const optionalSignForInfoArg = visitor.config.optionalInfoArgument ? '?' : '';
    const prepend = [];
    const defsToInclude = [];
    const legacyStitchingResolverType = `
export type LegacyStitchingResolver<TResult, TParent, TContext, TArgs> = {
  fragment: string;
  resolve: ResolverFn<TResult, TParent, TContext, TArgs>;
};`;
    const newStitchingResolverType = `
export type NewStitchingResolver<TResult, TParent, TContext, TArgs> = {
  selectionSet: string;
  resolve: ResolverFn<TResult, TParent, TContext, TArgs>;
};`;
    const stitchingResolverType = `export type StitchingResolver<TResult, TParent, TContext, TArgs> = LegacyStitchingResolver<TResult, TParent, TContext, TArgs> | NewStitchingResolver<TResult, TParent, TContext, TArgs>;`;
    const resolverType = `export type Resolver<TResult, TParent = {}, TContext = {}, TArgs = {}> =`;
    const resolverFnUsage = `ResolverFn<TResult, TParent, TContext, TArgs>`;
    const stitchingResolverUsage = `StitchingResolver<TResult, TParent, TContext, TArgs>`;
    if (visitor.hasFederation()) {
        if (visitor.config.wrapFieldDefinitions) {
            defsToInclude.push(`export type UnwrappedObject<T> = {
        [P in keyof T]: T[P] extends infer R | Promise<infer R> | (() => infer R2 | Promise<infer R2>)
          ? R & R2 : T[P]
      };`);
        }
        defsToInclude.push(`export type ReferenceResolver<TResult, TReference, TContext> = (
      reference: TReference,
      context: TContext,
      info${optionalSignForInfoArg}: GraphQLResolveInfo
    ) => Promise<TResult> | TResult;`);
        defsToInclude.push(`
      type ScalarCheck<T, S> = S extends true ? T : NullableCheck<T, S>;
      type NullableCheck<T, S> = Maybe<T> extends T ? Maybe<ListCheck<NonNullable<T>, S>> : ListCheck<T, S>;
      type ListCheck<T, S> = T extends (infer U)[] ? NullableCheck<U, S>[] : GraphQLRecursivePick<T, S>;
      export type GraphQLRecursivePick<T, S> = { [K in keyof T & keyof S]: ScalarCheck<T[K], S[K]> };
    `);
    }
    if (noSchemaStitching) {
        // Resolver = ResolverFn;
        defsToInclude.push(`${resolverType} ${resolverFnUsage};`);
    }
    else {
        // StitchingResolver
        // Resolver =
        // | ResolverFn
        // | StitchingResolver;
        defsToInclude.push([
            legacyStitchingResolverType,
            newStitchingResolverType,
            stitchingResolverType,
            resolverType,
            `  | ${resolverFnUsage}`,
            `  | ${stitchingResolverUsage};`,
        ].join('\n'));
    }
    if (config.customResolverFn) {
        const parsedMapper = parseMapper(config.customResolverFn);
        if (parsedMapper.isExternal) {
            const importType = config.useTypeImports ? 'import type' : 'import';
            if (parsedMapper.default) {
                prepend.push(`${importType} ResolverFn from '${parsedMapper.source}';`);
            }
            else {
                prepend.push(`${importType} { ${parsedMapper.import} ${parsedMapper.import !== 'ResolverFn' ? 'as ResolverFn ' : ''}} from '${parsedMapper.source}';`);
            }
            prepend.push(`export${config.useTypeImports ? ' type' : ''} { ResolverFn };`);
        }
        else {
            prepend.push(`export type ResolverFn<TResult, TParent, TContext, TArgs> = ${parsedMapper.type}`);
        }
    }
    else {
        const defaultResolverFn = `
export type ResolverFn<TResult, TParent, TContext, TArgs> = (
  parent: TParent,
  args: TArgs,
  context: TContext,
  info${optionalSignForInfoArg}: GraphQLResolveInfo
) => Promise<TResult> | TResult;`;
        defsToInclude.push(defaultResolverFn);
    }
    const header = `${indexSignature}

${visitor.getResolverTypeWrapperSignature()}

${defsToInclude.join('\n')}

export type SubscriptionSubscribeFn<TResult, TParent, TContext, TArgs> = (
  parent: TParent,
  args: TArgs,
  context: TContext,
  info${optionalSignForInfoArg}: GraphQLResolveInfo
) => AsyncIterator<TResult> | Promise<AsyncIterator<TResult>>;

export type SubscriptionResolveFn<TResult, TParent, TContext, TArgs> = (
  parent: TParent,
  args: TArgs,
  context: TContext,
  info${optionalSignForInfoArg}: GraphQLResolveInfo
) => TResult | Promise<TResult>;

export interface SubscriptionSubscriberObject<TResult, TKey extends string, TParent, TContext, TArgs> {
  subscribe: SubscriptionSubscribeFn<{ [key in TKey]: TResult }, TParent, TContext, TArgs>;
  resolve?: SubscriptionResolveFn<TResult, { [key in TKey]: TResult }, TContext, TArgs>;
}

export interface SubscriptionResolverObject<TResult, TParent, TContext, TArgs> {
  subscribe: SubscriptionSubscribeFn<any, TParent, TContext, TArgs>;
  resolve: SubscriptionResolveFn<TResult, any, TContext, TArgs>;
}

export type SubscriptionObject<TResult, TKey extends string, TParent, TContext, TArgs> =
  | SubscriptionSubscriberObject<TResult, TKey, TParent, TContext, TArgs>
  | SubscriptionResolverObject<TResult, TParent, TContext, TArgs>;

export type SubscriptionResolver<TResult, TKey extends string, TParent = {}, TContext = {}, TArgs = {}> =
  | ((...args: any[]) => SubscriptionObject<TResult, TKey, TParent, TContext, TArgs>)
  | SubscriptionObject<TResult, TKey, TParent, TContext, TArgs>;

export type TypeResolveFn<TTypes, TParent = {}, TContext = {}> = (
  parent: TParent,
  context: TContext,
  info${optionalSignForInfoArg}: GraphQLResolveInfo
) => ${namespacedImportPrefix}Maybe<TTypes> | Promise<${namespacedImportPrefix}Maybe<TTypes>>;

export type IsTypeOfResolverFn<T = {}> = (obj: T, info${optionalSignForInfoArg}: GraphQLResolveInfo) => boolean | Promise<boolean>;

export type NextResolverFn<T> = () => Promise<T>;

export type DirectiveResolverFn<TResult = {}, TParent = {}, TContext = {}, TArgs = {}> = (
  next: NextResolverFn<TResult>,
  parent: TParent,
  args: TArgs,
  context: TContext,
  info${optionalSignForInfoArg}: GraphQLResolveInfo
) => TResult | Promise<TResult>;
`;
    const resolversTypeMapping = visitor.buildResolversTypes();
    const resolversParentTypeMapping = visitor.buildResolversParentTypes();
    const { getRootResolver, getAllDirectiveResolvers, mappersImports, unusedMappers, hasScalars } = visitor;
    if (hasScalars()) {
        imports.push('GraphQLScalarType', 'GraphQLScalarTypeConfig');
    }
    if (showUnusedMappers && unusedMappers.length) {
        // eslint-disable-next-line no-console
        console.warn(`Unused mappers: ${unusedMappers.join(',')}`);
    }
    if (imports.length) {
        prepend.push(`import { ${imports.join(', ')} } from 'graphql';`);
    }
    if (config.customResolveInfo) {
        const parsedMapper = parseMapper(config.customResolveInfo);
        if (parsedMapper.isExternal) {
            if (parsedMapper.default) {
                prepend.push(`import GraphQLResolveInfo from '${parsedMapper.source}'`);
            }
            prepend.push(`import { ${parsedMapper.import} ${parsedMapper.import !== 'GraphQLResolveInfo' ? 'as GraphQLResolveInfo' : ''} } from '${parsedMapper.source}';`);
        }
        else {
            prepend.push(`type GraphQLResolveInfo = ${parsedMapper.type}`);
        }
    }
    prepend.push(...mappersImports, ...visitor.globalDeclarations);
    return {
        prepend,
        content: [
            header,
            resolversTypeMapping,
            resolversParentTypeMapping,
            ...visitorResult.definitions.filter(d => typeof d === 'string'),
            getRootResolver(),
            getAllDirectiveResolvers(),
        ].join('\n'),
    };
};

export { TypeScriptResolversVisitor, plugin };
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