@eddaic/nestjs-decorators/string/transformer/to-boolean.transformer.js

Additional decorators intended for use with NestJS framework.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.toBoolean = toBoolean;
exports.ToBoolean = ToBoolean;
const class_transformer_1 = require("class-transformer");
/**
 * Converts falsy values `null`, `undefined`, `0`, `false` and empty strings
 * to false. Otherwise the value is returned as true
 * @param value
 * @returns
 */
function toBoolean(value) {
    if (value === null || value === undefined) {
        return false;
    }
    else if (typeof value === 'boolean') {
        return value;
    }
    else if (typeof value === 'string') {
        return !['false', '0', ''].includes(value.trim());
    }
    else if (typeof value === 'number') {
        return value !== 0;
    }
    else if (typeof value === 'bigint') {
        return value !== 0n;
    }
    else if (typeof value === 'object') {
        return true;
    }
    else {
        return false;
    }
}
/**
 * Transform a boolean value or leave undefined if not present
 * @param field - the property name of the value to transform in the object
 * @returns PropertyDecorator
 */
function ToBoolean(field) {
    return (0, class_transformer_1.Transform)(({ obj = {} }) => typeof obj === 'object' && field in obj
        ? // eslint-disable-next-line @typescript-eslint/no-unsafe-member-access
            toBoolean(obj[field])
        : undefined);
}