computed-types/lib/schema/validations.js

Runtime validation types for TypeScript.

"use strict";

exports.__esModule = true;
exports.array = array;
exports.destruct = destruct;
exports.enumValue = enumValue;
exports.equals = equals;
exports.error = error;
exports.recordValue = recordValue;
exports.regexp = regexp;
exports.test = test;
exports.type = type;

var _errors = require("./errors");

var _utils = require("./utils");

function type(type, error) {
  return (...args) => {
    if (typeof args[0] !== type || args[0] === null) {
      throw (0, _errors.toError)(error || `Expect value to be "${type}"`, ...args);
    }

    return args[0];
  };
}

function equals(expected, error) {
  return (...args) => {
    if (args[0] !== expected) {
      throw (0, _errors.toError)(error || `Expect value to equal "${expected}"`, ...args);
    }

    return args[0];
  };
}

function test(tester, error) {
  return (...args) => {
    if (!tester(...args)) {
      throw (0, _errors.toError)(error || `Validation test failed`, ...args);
    }

    return args[0];
  };
}

function destruct(validator, error) {
  return (...args) => {
    try {
      const res = validator(...args);

      if (!(0, _utils.isPromiseLike)(res)) {
        return [null, res];
      }

      return res.then(ret => [null, ret], err => [error ? (0, _errors.toError)(error, ...args) : err]);
    } catch (err) {
      return [error ? (0, _errors.toError)(error, ...args) : err];
    }
  };
}

function error(validator, err) {
  return (...args) => {
    try {
      const res = validator(...args);

      if (!(0, _utils.isPromiseLike)(res)) {
        return res;
      }

      return res.then(null, () => {
        throw (0, _errors.toError)(err, ...args);
      });
    } catch (e) {
      throw (0, _errors.toError)(err, ...args);
    }
  };
}

function regexp(exp, error) {
  if (!(exp instanceof RegExp)) {
    exp = new RegExp(exp);
  }

  return (...args) => {
    if (!exp.test(args[0])) {
      throw (0, _errors.toError)(error || `Invalid string format (expected: ${exp})`, ...args);
    }

    return String(args[0]);
  };
}

function array(length = null, error) {
  const isArray = (...args) => {
    if (!Array.isArray(args[0])) {
      throw (0, _errors.toError)(error || `Expecting value to be an array`, ...args);
    }

    return args[0];
  };

  if (length === null) {
    return isArray;
  }

  return (...args) => {
    const arr = isArray(...args);

    if (arr.length !== length) {
      throw (0, _errors.toError)(error || `Expected array length ${length} (given: ${arr.length})`, ...args);
    }

    return arr;
  };
}

function enumValue(value, error) {
  const values = new Set(Object.keys(value).filter(key => isNaN(Number(key))).map(key => value[key]));
  return (...args) => {
    if (!values.has(args[0])) {
      throw (0, _errors.toError)(error || 'Unknown enum value', ...args);
    }

    return args[0];
  };
}

function recordValue(key, value, error) {
  return (...args) => {
    const [input] = args;

    if (!input || typeof input !== 'object') {
      throw (0, _errors.toError)(error || 'Expected non-null object', ...args);
    }

    const obj = {};

    for (const k in input) {
      try {
        obj[key(k)] = value(input[k]);
      } catch (error) {
        throw (0, _errors.createValidationError)([{
          path: [k],
          error: error
        }], null, ...args);
      }
    }

    return obj;
  };
}
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{\n  createValidationError,\n  ErrorLike,\n  toError,\n  ValidationError,\n} from './errors';\nimport FunctionType, { FunctionParameters } from './FunctionType';\nimport {\n  Enum,\n  isPromiseLike,\n  MaybeAsync,\n  ObjectProperty,\n  ResolvedValue,\n  Typeof,\n} from './utils';\n\nexport function type<\n  T extends keyof Typeof,\n  P extends FunctionParameters = [Typeof[T]],\n>(type: T, error?: ErrorLike<P>): FunctionType<Typeof[T], P> {\n  return (...args: P): Typeof[T] => {\n    if (typeof args[0] !== type || args[0] === null) {\n      throw toError(error || `Expect value to be \"${type}\"`, ...args);\n    }\n\n    return args[0] as Typeof[T];\n  };\n}\n\nexport function equals<T, P extends FunctionParameters = [T]>(\n  expected: T,\n  error?: ErrorLike<P>,\n): FunctionType<T, P> {\n  return (...args: P): T => {\n    if (args[0] !== expected) {\n      throw toError(error || `Expect value to equal \"${expected}\"`, ...args);\n    }\n\n    return args[0] as T;\n  };\n}\n\nexport function test<P extends FunctionParameters>(\n  tester: FunctionType<unknown, P>,\n  error?: ErrorLike<P>,\n): FunctionType<P[0], P> {\n  return (...args: P): P[0] => {\n    if (!tester(...args)) {\n      throw toError(error || `Validation test failed`, ...args);\n    }\n\n    return args[0];\n  };\n}\n\nexport function destruct<F extends FunctionType>(\n  validator: F,\n  error?: ErrorLike<Parameters<F>>,\n): FunctionType<\n  MaybeAsync<\n    ReturnType<F>,\n    [ValidationError | null, ResolvedValue<ReturnType<F>>?]\n  >,\n  Parameters<F>\n> {\n  return ((\n    ...args: Parameters<F>\n  ):\n    | [Error | null, ResolvedValue<ReturnType<F>>?]\n    | PromiseLike<[Error | null, ResolvedValue<ReturnType<F>>?]> => {\n    try {\n      const res = validator(...args);\n      if (!isPromiseLike(res)) {\n        return [null, res];\n      }\n\n      return res.then(\n        (ret) => [null, ret],\n        (err) => [error ? toError(error, ...args) : err],\n      ) as PromiseLike<[Error | null, ResolvedValue<ReturnType<F>>?]>;\n    } catch (err) {\n      return [error ? toError(error, ...args) : (err as Error)];\n    }\n  }) as FunctionType<\n    MaybeAsync<ReturnType<F>, [Error | null, ResolvedValue<ReturnType<F>>?]>,\n    Parameters<F>\n  >;\n}\n\nexport function error<R, P extends FunctionParameters>(\n  validator: FunctionType<R, P>,\n  err: ErrorLike<P>,\n): FunctionType<R, P> {\n  return (...args: P): R => {\n    try {\n      const res = validator(...args);\n      if (!isPromiseLike(res)) {\n        return res;\n      }\n\n      return res.then(null, (): never => {\n        throw toError(err, ...args);\n      }) as unknown as R;\n    } catch (e) {\n      throw toError(err, ...args);\n    }\n  };\n}\n\nexport function regexp<P extends FunctionParameters = [string]>(\n  exp: RegExp | string,\n  error?: ErrorLike<P>,\n): FunctionType<string, P> {\n  if (!(exp instanceof RegExp)) {\n    exp = new RegExp(exp);\n  }\n\n  return (...args: P): string => {\n    if (!(exp as RegExp).test(args[0] as string)) {\n      throw toError(\n        error || `Invalid string format (expected: ${exp})`,\n        ...args,\n      );\n    }\n\n    return String(args[0]);\n  };\n}\n\nexport function array<\n  R extends Array<unknown>,\n  P extends FunctionParameters = [R],\n>(length: number | null = null, error?: ErrorLike<P>): FunctionType<R, P> {\n  const isArray = (...args: P): R => {\n    if (!Array.isArray(args[0])) {\n      throw toError(error || `Expecting value to be an array`, ...args);\n    }\n\n    return args[0] as R;\n  };\n\n  if (length === null) {\n    return isArray;\n  }\n\n  return (...args: P): R => {\n    const arr = isArray(...args);\n\n    if (arr.length !== length) {\n      throw toError(\n        error || `Expected array length ${length} (given: ${arr.length})`,\n        ...args,\n      );\n    }\n\n    return arr;\n  };\n}\n\nexport function enumValue<\n  E extends Enum<E>,\n  P extends FunctionParameters = [E[keyof E]],\n>(value: E, error?: ErrorLike<P>): FunctionType<E[keyof E], P> {\n  const values = new Set<E[keyof E]>(\n    Object.keys(value)\n      .filter((key) => isNaN(Number(key)))\n      .map((key) => value[key as keyof E]),\n  );\n\n  return (...args: P): E[keyof E] => {\n    if (!values.has(args[0] as E[keyof E])) {\n      throw toError(error || 'Unknown enum value', ...args);\n    }\n\n    return args[0] as E[keyof E];\n  };\n}\n\nexport function recordValue<\n  K extends ObjectProperty,\n  V,\n  IK extends ObjectProperty,\n  IV,\n  P extends FunctionParameters = [Record<IK, IV>],\n>(\n  key: FunctionType<K, [IK]>,\n  value: FunctionType<V, [IV]>,\n  error?: ErrorLike<P>,\n): FunctionType<Record<K, V>, P> {\n  return (...args) => {\n    const [input] = args;\n\n    if (!input || typeof input !== 'object') {\n      throw toError(error || 'Expected non-null object', ...args);\n    }\n\n    const obj = {} as Record<K, V>;\n\n    for (const k in input) {\n      try {\n        obj[key(k as IK)] = value((input as Record<string, unknown>)[k] as IV);\n      } catch (error) {\n        throw createValidationError(\n          [\n            {\n              path: [k],\n              error: error as Error,\n            },\n          ],\n          null,\n          ...args,\n        );\n      }\n    }\n\n    return obj;\n  };\n}\n"]}