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index.ts
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index.ts
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import {
validate,
validateSync,
validateOrReject,
ValidatorOptions,
} from "class-validator";
import { plainToClass, ClassTransformOptions } from "class-transformer";
export type ClassType<T> = new (...args: any[]) => T;
export interface TransformValidationOptions {
validator?: ValidatorOptions;
transformer?: ClassTransformOptions;
}
/**
* Asynchronously converts JSON string to class (constructor) object.
* Reject the promise if the object parsed from string doesn't pass validation.
*
* @param {ClassType<T>} classType The Class to parse and convert JSON to
* @param {string} jsonString The string containing JSON
* @param {TransformValidationOptions} [options] Optional options object for class-validator and class-transformer
* @returns {Promise<T|T[]>} Promise of object of given class T or array of objects given class T
*/
export function transformAndValidate<T extends object>(
classType: ClassType<T>,
jsonString: string,
options?: TransformValidationOptions,
): Promise<T | T[]>;
/**
* Asynchronously converts array of plain objects to array of class (constructor) objects.
* Reject the promise if any of the objects in array doesn't pass validation.
*
* @param {ClassType<T>} classType The Class to convert object to
* @param {object} array The array of objects to instantiate and validate
* @param {TransformValidationOptions} [options] Optional options object for class-validator and class-transformer
* @returns {Promise<T>} Promise of object of given class T
*/
export function transformAndValidate<T extends object>(
classType: ClassType<T>,
array: object[],
options?: TransformValidationOptions,
): Promise<T[]>;
/**
* Asynchronously converts plain object to class (constructor) object.
* Reject the promise if the object doesn't pass validation.
*
* @param {ClassType<T>} classType The Class to convert object to
* @param {object} object The object to instantiate and validate
* @param {TransformValidationOptions} [options] Optional options object for class-validator and class-transformer
* @returns {Promise<T>} Promise of object of given class T
*/
export function transformAndValidate<T extends object>(
classType: ClassType<T>,
object: object,
options?: TransformValidationOptions,
): Promise<T>;
export function transformAndValidate<T extends object>(
classType: ClassType<T>,
somethingToTransform: string | object | object[],
options?: TransformValidationOptions,
): Promise<T> {
return new Promise((resolve, reject) => {
let object: object;
if (typeof somethingToTransform === "string") {
object = JSON.parse(somethingToTransform);
} else if (
somethingToTransform != null &&
typeof somethingToTransform === "object"
) {
object = somethingToTransform;
} else {
return reject(
new Error(
"Incorrect object param type! Only string, plain object and array of plain objects are valid.",
),
);
}
const classObject = plainToClass(
classType,
object,
options ? options.transformer : void 0,
);
if (Array.isArray(classObject)) {
Promise.all(
classObject.map(objectElement =>
validate(objectElement, options ? options.validator : void 0),
),
).then(errors =>
errors.every(error => error.length === 0)
? resolve(classObject)
: reject(errors),
);
} else {
validateOrReject(classObject, options ? options.validator : void 0)
.then(() => resolve(classObject))
.catch(reject);
}
});
}
/**
* Synchronously converts JSON string to class (constructor) object.
* Throws error if the object parsed from string doesn't pass validation.
*
* @param {ClassType<T>} classType The Class to parse and convert JSON to
* @param {string} jsonString The string containing JSON
* @param {TransformValidationOptions} [options] Optional options object for class-validator and class-transformer
* @returns {T|T[]} Object of given class T or array of objects given class T
*/
export function transformAndValidateSync<T extends object>(
classType: ClassType<T>,
jsonString: string,
options?: TransformValidationOptions,
): T | T[];
/**
* Synchronously converts array of plain objects to array of class (constructor) objects.
* Throws error if any of the objects in array doesn't pass validation.
*
* @param {ClassType<T>} classType The Class to convert object to
* @param {object} array The array of objects to instantiate and validate
* @param {TransformValidationOptions} [options] Optional options object for class-validator and class-transformer
* @returns {T[]} Array of objects of given class T
*/
export function transformAndValidateSync<T extends object>(
classType: ClassType<T>,
array: object[],
options?: TransformValidationOptions,
): T[];
/**
* Synchronously converts plain object to class (constructor) object.
* Throws error if the object doesn't pass validation.
*
* @param {ClassType<T>} classType The Class to convert object to
* @param {object} object The object to instantiate and validate
* @param {TransformValidationOptions} [options] Optional options object for class-validator and class-transformer
* @returns {T} Object of given class T
*/
export function transformAndValidateSync<T extends object>(
classType: ClassType<T>,
object: object,
options?: TransformValidationOptions,
): T;
export function transformAndValidateSync<T extends object>(
classType: ClassType<T>,
somethingToTransform: string | object | object[],
options?: TransformValidationOptions,
): T {
let object: object;
if (typeof somethingToTransform === "string") {
object = JSON.parse(somethingToTransform);
} else if (
somethingToTransform != null &&
typeof somethingToTransform === "object"
) {
object = somethingToTransform;
} else {
throw new Error(
"Incorrect object param type! Only string, plain object and array of plain objects are valid.",
);
}
const classObject = plainToClass(
classType,
object,
options ? options.transformer : void 0,
);
if (Array.isArray(classObject)) {
const errorsArray = classObject.map(objectElement =>
validateSync(objectElement, options ? options.validator : void 0),
);
if (errorsArray.some(errors => errors.length !== 0)) {
throw errorsArray;
}
return classObject;
} else {
const errors = validateSync(
classObject,
options ? options.validator : void 0,
);
if (errors.length) {
throw errors;
}
return classObject;
}
}