Ruled Validator

Type-friendly JSON based validator engine like https://ant.design/components/form/#Rule

Usage

yarn add @jimengio/ruled-validator

ruledValidate(x, rules) returns a string for a failure, returns undefined for ok.

import { RuledRules, RuledRuleEntry, ruledValidate } from "@jimengio/ruled-validator";

let stringLengthRules: RuledRuleEntry = {
  type: "string",
  failText: "required string",
  next: [
    { type: "max-length", n: 4, failText: "too long" },
    { type: "min-length", n: 2, failText: "too short" },
    { type: "regex", regex: /^[a-zA-Z]+$/, failText: "not letters" },
    { type: "fn", test: (x) => !x.includes("X"), failText: "X invalid" },
  ],
};

expect(ruledValidate("1", stringLengthRules)).toBe("too short");

Types

Validation rules are not nested in an arbitrary ways. Notice the structure:

| Top-level type | Sub type | Options | Usage | | -------------- | -------------- | ---------------------- | ------------------------------------------ | | string | | | | | | | rejectEmpty: boolean | treat "" as invalid | | | | rejectBlank: boolean | treat "" and " " as invalid | | | max-length | n: number | | | | min-length | n: number | | | | regex | regex: RegExp | | | | email | | | | | non-chinese | | | | | fn | test: Function | | | array | | | | | | | rejectEmpty: boolean | treat [] as invalid | | | max-length | n: number | | | | min-length | n: number | | | | fn | test: Function | | | number | | | | | | max | n: number | | | | | rejectEqual: boolean | treat n as invalid | | | min | n: number | | | | | rejectEqual: boolean | treat n as invalid | | | fn | test: Function | | | object | | | | | | fn | test: Function | | | boolean | | | | | required | all types... | | this is special, most times can be omitted | | fn | | test: Function | custom validation funcion, returns boolean | | registered | | | | | | | name: string | | | | | options: object | |

Registered type

In app level, use registerRuledValidatorRule to create rules in registered type for custom quick validations.

import { registerRuledValidatorRule } from "@jimengio/ruled-validator";

registerRuledValidatorRule("email", (x: string, options) => {
  if (typeof x !== "string") {
    return false;
  }
  return /^\w+@\w+\.\w+$/.test(x);
});

let stringEmailRule: RuledRuleEntry = {
  type: "string",
  failText: "required string",
  next: [{ type: "registered", name: "email", failText: "invalid email" }],
};

expect(ruledValidate("x", emailRule)).toBe("invalid email");
expect(ruledValidate("[email protected]", emailRule)).toBe(undefined);

To treat empty strings/arrays as null, use rejectEmpty("", []) or rejectBlank(e.g. " ").

Workflow

https://github.com/jimengio/ts-workflow

License

MIT