graphql-request/build/layers/2_generator/code/Error.js

Minimal GraphQL client supporting Node and browsers for scripts or simple apps.

import { createCodeGenerator } from '../createCodeGenerator.js';
export const { generate: generateError, moduleName: moduleNameError } = createCodeGenerator(`Error`, (config) => {
    const code = [];
    code.push(`type Include<T, U> = Exclude<T, Exclude<T, U>>`, `type ObjectWithTypeName = { __typename: string }`);
    code.push(`
    const ErrorObjectsTypeNameSelectedEnum = {
      ${config.error.objects.map(_ => `${_.name}: { __typename: '${_.name}' }`).join(`,\n`)}
    } as ${config.error.objects.length > 0 ? `const` : `Record<string,ObjectWithTypeName>`}

    const ErrorObjectsTypeNameSelected = Object.values(ErrorObjectsTypeNameSelectedEnum)

    type ErrorObjectsTypeNameSelected = (typeof ErrorObjectsTypeNameSelected)[number]
  `);
    code.push(`export const isError = <$Value>(value:$Value): value is Include<$Value, ErrorObjectsTypeNameSelected> =>  {
      return typeof value === 'object' && value !== null && '__typename' in value &&
      ErrorObjectsTypeNameSelected.some(_ => _.__typename === value.__typename)
    }`);
    return code.join(`\n\n`);
});
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