@appsemble/utils/convertToCsv.js

Utility functions used in Appsemble internally

import { compareStrings } from './index.js';
/**
 * Converts an object or an array of objects to a valid CSV format.
 *
 * Implements https://tools.ietf.org/html/rfc4180
 *
 * @param body An object containing the data to be converted.
 * @returns The data serialized as CSV.
 */
export function convertToCsv(body) {
    const separator = ',';
    const lineEnd = '\r\n';
    const quote = '"';
    const quoteRegex = new RegExp(quote, 'g');
    const escape = (value) => value.includes(separator) || value.includes(lineEnd) || value.includes(quote)
        ? `${quote}${value.replaceAll(quoteRegex, `${quote}${quote}`)}${quote}`
        : value;
    if (body == null) {
        throw new Error('No data');
    }
    if (typeof body !== 'object') {
        throw new TypeError('Data is of an invalid type');
    }
    const data = Array.isArray(body) ? body : [body];
    if (data.length === 0) {
        // eslint-disable-next-line @typescript-eslint/prefer-ts-expect-error
        // @ts-ignore 2322 null is not assignable to type (strictNullChecks)
        return null;
    }
    const headers = [...new Set(data.flatMap((value) => Object.keys(value)))].sort(compareStrings);
    if (headers.length === 0) {
        throw new Error('No headers could be found');
    }
    const lines = data.map((object) => {
        const values = headers.map((header) => {
            let value = object[header];
            if (value == null) {
                return '';
            }
            if (value.toJSON instanceof Function) {
                value = value.toJSON();
            }
            if (typeof value !== 'string') {
                value = JSON.stringify(value);
            }
            return escape(value);
        });
        return values.join(separator);
    });
    return `${headers.map((header) => escape(header)).join(separator)}${lineEnd}${lines.join(lineEnd)}${lineEnd}`;
}
//# sourceMappingURL=convertToCsv.js.map