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@acaldas/graphql-codegen-typescript-validation-schema

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GraphQL Code Generator plugin to generate form validation schema from your GraphQL schema

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import { DeclarationBlock, indent } from '@graphql-codegen/visitor-plugin-common'; import { buildApi, formatDirectiveConfig } from '../directive'; import { BaseSchemaVisitor } from '../schema_visitor'; import { isInput, isListType, isNamedType, isNonNullType, ObjectTypeDefinitionBuilder } from './../graphql'; const anySchema = `definedNonNullAnySchema`; export class MyZodSchemaVisitor extends BaseSchemaVisitor { constructor(schema, config) { super(schema, config); } importValidationSchema() { return `import * as myzod from 'myzod'`; } initialEmit() { return ('\n' + [ new DeclarationBlock({}).export().asKind('const').withName(`${anySchema}`).withContent(`myzod.object({})`) .string, ...this.enumDeclarations, ].join('\n')); } get InputObjectTypeDefinition() { return { leave: (node) => { const visitor = this.createVisitor('input'); const name = visitor.convertName(node.name.value); this.importTypes.push(name); return this.buildInputFields(node.fields ?? [], visitor, name); }, }; } get ObjectTypeDefinition() { return { leave: ObjectTypeDefinitionBuilder(this.config.withObjectType, (node) => { const visitor = this.createVisitor('output'); const name = visitor.convertName(node.name.value); this.importTypes.push(name); // Building schema for field arguments. const argumentBlocks = this.buildObjectTypeDefinitionArguments(node, visitor); const appendArguments = argumentBlocks ? '\n' + argumentBlocks : ''; // Building schema for fields. const shape = node.fields?.map(field => generateFieldMyZodSchema(this.config, visitor, field, 2)).join(',\n'); switch (this.config.validationSchemaExportType) { case 'const': return (new DeclarationBlock({}) .export() .asKind('const') .withName(`${name}Schema: myzod.Type<${name}>`) .withContent([ `myzod.object({`, indent(`__typename: myzod.literal('${node.name.value}').optional(),`, 2), shape, '})', ].join('\n')).string + appendArguments); case 'function': default: return (new DeclarationBlock({}) .export() .asKind('function') .withName(`${name}Schema(): myzod.Type<${name}>`) .withBlock([ indent(`return myzod.object({`), indent(`__typename: myzod.literal('${node.name.value}').optional(),`, 2), shape, indent('})'), ].join('\n')).string + appendArguments); } }), }; } get EnumTypeDefinition() { return { leave: (node) => { const visitor = this.createVisitor('both'); const enumname = visitor.convertName(node.name.value); this.importTypes.push(enumname); // z.enum are basically myzod.literals // hoist enum declarations this.enumDeclarations.push(this.config.enumsAsTypes ? new DeclarationBlock({}) .export() .asKind('type') .withName(`${enumname}Schema`) .withContent(`myzod.literals(${node.values?.map(enumOption => `'${enumOption.name.value}'`).join(', ')})`).string : new DeclarationBlock({}) .export() .asKind('const') .withName(`${enumname}Schema`) .withContent(`myzod.enum(${enumname})`).string); }, }; } get UnionTypeDefinition() { return { leave: (node) => { if (!node.types || !this.config.withObjectType) return; const visitor = this.createVisitor('output'); const unionName = visitor.convertName(node.name.value); const unionElements = node.types ?.map(t => { const element = visitor.convertName(t.name.value); const typ = visitor.getType(t.name.value); if (typ?.astNode?.kind === 'EnumTypeDefinition') { return `${element}Schema`; } switch (this.config.validationSchemaExportType) { case 'const': return `${element}Schema`; case 'function': default: return `${element}Schema()`; } }) .join(', '); const unionElementsCount = node.types?.length ?? 0; const union = unionElementsCount > 1 ? `myzod.union([${unionElements}])` : unionElements; switch (this.config.validationSchemaExportType) { case 'const': return new DeclarationBlock({}).export().asKind('const').withName(`${unionName}Schema`).withContent(union) .string; case 'function': default: return new DeclarationBlock({}) .export() .asKind('function') .withName(`${unionName}Schema()`) .withBlock(indent(`return ${union}`)).string; } }, }; } buildInputFields(fields, visitor, name) { const shape = fields.map(field => generateFieldMyZodSchema(this.config, visitor, field, 2)).join(',\n'); switch (this.config.validationSchemaExportType) { case 'const': return new DeclarationBlock({}) .export() .asKind('const') .withName(`${name}Schema: myzod.Type<${name}>`) .withContent(['myzod.object({', shape, '})'].join('\n')).string; case 'function': default: return new DeclarationBlock({}) .export() .asKind('function') .withName(`${name}Schema(): myzod.Type<${name}>`) .withBlock([indent(`return myzod.object({`), shape, indent('})')].join('\n')).string; } } } const generateFieldMyZodSchema = (config, visitor, field, indentCount) => { const gen = generateFieldTypeMyZodSchema(config, visitor, field, field.type); return indent(`${field.name.value}: ${maybeLazy(field.type, gen)}`, indentCount); }; const generateFieldTypeMyZodSchema = (config, visitor, field, type, parentType) => { if (isListType(type)) { const gen = generateFieldTypeMyZodSchema(config, visitor, field, type.type, type); if (!isNonNullType(parentType)) { const arrayGen = `myzod.array(${maybeLazy(type.type, gen)})`; const maybeLazyGen = applyDirectives(config, field, arrayGen); return `${maybeLazyGen}.optional().nullable()`; } return `myzod.array(${maybeLazy(type.type, gen)})`; } if (isNonNullType(type)) { const gen = generateFieldTypeMyZodSchema(config, visitor, field, type.type, type); return maybeLazy(type.type, gen); } if (isNamedType(type)) { const gen = generateNameNodeMyZodSchema(config, visitor, type.name); if (isListType(parentType)) { return `${gen}.nullable()`; } const appliedDirectivesGen = applyDirectives(config, field, gen); if (isNonNullType(parentType)) { if (visitor.shouldEmitAsNotAllowEmptyString(type.name.value)) { return `${gen}.min(1)`; } return appliedDirectivesGen; } if (isListType(parentType)) { return `${appliedDirectivesGen}.nullable()`; } return `${appliedDirectivesGen}.optional().nullable()`; } console.warn('unhandled type:', type); return ''; }; const applyDirectives = (config, field, gen) => { if (config.directives && field.directives) { const formatted = formatDirectiveConfig(config.directives); return gen + buildApi(formatted, field.directives); } return gen; }; const generateNameNodeMyZodSchema = (config, visitor, node) => { const converter = visitor.getNameNodeConverter(node); switch (converter?.targetKind) { case 'InputObjectTypeDefinition': case 'ObjectTypeDefinition': case 'UnionTypeDefinition': // using switch-case rather than if-else to allow for future expansion switch (config.validationSchemaExportType) { case 'const': return `${converter.convertName()}Schema`; case 'function': default: return `${converter.convertName()}Schema()`; } case 'EnumTypeDefinition': return `${converter.convertName()}Schema`; default: return myzod4Scalar(config, visitor, node.value); } }; const maybeLazy = (type, schema) => { if (isNamedType(type) && isInput(type.name.value)) { return `myzod.lazy(() => ${schema})`; } return schema; }; const myzod4Scalar = (config, visitor, scalarName) => { if (config.scalarSchemas?.[scalarName]) { return config.scalarSchemas[scalarName]; } const tsType = visitor.getScalarType(scalarName); switch (tsType) { case 'string': return `myzod.string()`; case 'number': return `myzod.number()`; case 'boolean': return `myzod.boolean()`; } console.warn('unhandled name:', scalarName); return anySchema; };