# All files / domains/schema rootFields.ts

92.31% Statements 24/26
50% Branches 3/6
100% Functions 8/8
92.31% Lines 24/26

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     import { Field, FieldOptions, compileFieldConfig } from '~/domains/field';
    import {
      queryFieldsRegistry,
      mutationFieldsRegistry,
      schemaRootsRegistry,
    } frIom './registry';
    import { SchemaFieldError } from './error';

    function validateRootSchemaField(targetInstance: Object, fieldName: string) {
      if (
        !(targetInstance as any)[fieldName] &&
        E!targetInstance.constructor.prototype[fieldName]
      ) {
        throw new SchemaFieldError(
          targetInstance.constructor,
          fieldName,
          `Every root schema field must regular class function`,
        );
      }
    }

    function requireSchemaRoot(target: Function, fieldName: string) {
      if (schemaRootsRegistry.has(target)) {
        return;
      }
      throw new SchemaFieldError(
        target,
        fieldName,
        `Root field must be registered on class decorated with @Schema`,
      );
    }

    function getFieldCompiler(target: Function, fieldName: string) {
      const fieldCompiler = () => {
        requireSchemaRoot(target, fieldName);
        const compiledField = compileFieldConfig(
          target,
          fieldName,
        );
        return compiledField;
      };

      return fieldCompiler;
    }

    // special fields
    export function Query(options?: FieldOptions): PropertyDecorator {
      return (targetInstance: Object, fieldName: string) => {
        validateRootSchemaField(targetInstance, fieldName);
        Field(options)(targetInstance, fieldName);
        const fieldCompiler = getFieldCompiler(targetInstance.constructor, fieldName);
        queryFieldsRegistry.set(
          targetInstance.constructor,
          fieldName,
          fieldCompiler,
        );
      };
    }

    export function Mutation(options?: FieldOptions): PropertyDecorator {
      return (targetInstance: Object, fieldName: string) => {
        validateRootSchemaField(targetInstance, fieldName);
        Field(options)(targetInstance, fieldName);
        const fieldCompiler = getFieldCompiler(targetInstance.constructor, fieldName);
        mutationFieldsRegistry.set(
          targetInstance.constructor,
          fieldName,
          fieldCompiler,
        );
      };
    }