@nestjs/common

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Decorators, pipes, exceptions and utilities for NestJS applications: @Controller(), @Injectable(), @Body(), ValidationPipe, HttpException and more.

nestjs.com

nestjs/nest

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export class InvalidDecoratorItemException extends Error {
    msg;
    constructor(decorator, item, context) {
        const message = `Invalid ${item} passed to ${decorator}() decorator (${context}).`;
        super(message);
        this.msg = message;
    }
    what() {
        return this.msg;
    }
}
export function validateEach(context, arr, predicate, decorator, item) {
    if (!context || !context.name) {
        return true;
    }
    const errors = arr.some(str => !predicate(str));
    if (errors) {
        throw new InvalidDecoratorItemException(decorator, item, context.name);
    }
    return true;
}