Using JSONSchemaType seems a huge build hog

What version of Ajv are you using? Does the issue happen if you use the latest version?

ajv@8.6.0

Your typescript code

import Ajv, { JSONSchemaType } from 'ajv';
import addFormats from 'ajv-formats';

interface UserRequestBody {
  firstName: string;
  lastName: string;
  email: string;
  age?: number;
  address?: string;
  city?: string;
  zip?: string;
}

const ajv = new Ajv({
  coerceTypes: true,
  useDefaults: true,
  removeAdditional: true,
});
addFormats(ajv);

const userValidationSchema: JSONSchemaType<UserRequestBody> = {
  type: 'object',
  properties: {
    firstName: { type: 'string' },
    lastName: { type: 'string' },
    email: { type: 'string', format: 'email' },
    age: { type: 'number', minimum: 1, nullable: true },
    address: { type: 'string', nullable: true },
    city: { type: 'string', nullable: true },
    zip: { type: 'string', nullable: true },
  },
  required: ['firstName', 'lastName', 'email'],
};

const validateUser = ajv.compile(userValidationSchema);

export default validateUser;

Typescript compiler error messages No compilation issues but build time increases drasticly, from around 1,5 secs to 11 secs

By using --generateTrace i discovered that is was related to UncheckedJSONSchemaType type.

Just changing to

import Ajv from 'ajv';
import addFormats from 'ajv-formats';

interface UserRequestBody {
  firstName: string;
  lastName: string;
  email: string;
  age?: number;
  address?: string;
  city?: string;
  zip?: string;
}

const ajv = new Ajv({
  coerceTypes: true,
  useDefaults: true,
  removeAdditional: true,
});
addFormats(ajv);

const userValidationSchema = {
  type: 'object',
  properties: {
    firstName: { type: 'string' },
    lastName: { type: 'string' },
    email: { type: 'string', format: 'email' },
    age: { type: 'number', minimum: 1, nullable: true },
    address: { type: 'string', nullable: true },
    city: { type: 'string', nullable: true },
    zip: { type: 'string', nullable: true },
  },
  required: ['firstName', 'lastName', 'email'],
};

const validateUser = ajv.compile<UserRequestBody>(userValidationSchema);

export default validateUser;

Describe the change that should be made to address the issue?

What can i do to assist or resolve this issue

Are you going to resolve the issue? Not sure if i can help 🤷

[aleccool213]

This wouldn’t be much of an issue if it was just a build time issue but @tommarien is right that it essentially makes your IDE unusable. Users will get put off by this. I have a very powerful Macbook and it slowed down the TS compiler in VS Code to a snail 🐌

[tommarien]

@epoberezkin wow, that was closed fast, maybe not advise it as best practice on the ajv site. Other question is there a type which you can use that just does the same as using the `“$schema”: “http://json-schema.org/draft-07/schema#” in your json schema?

const scheme: JSONSchema = {};

The problem is was describing impacts everything in a normal typescript oriented build, vscode intellisense is also impacted when using @typescript/es-lint. I am guessing there is something that can be optimised, maybe something recursive. maybe related to https://github.com/Microsoft/TypeScript/issues/3496#issuecomment-128553540