json-to-csv-export/lib/esm/generate.js

Easily generate csv downloads of your json data.

export var csvGenerateRow = function (row, headerKeys, delimiter) {
    var needsQuoteWrapping = new RegExp("[\"".concat(delimiter, "\r\n]"));
    return headerKeys
        .map(function (header) {
        var fieldName = typeof header === "string" ? header : header.key;
        var value = row[fieldName];
        if (typeof value === "number" || typeof value === "boolean")
            return "".concat(value);
        if (!value)
            return "";
        if (typeof value !== "string") {
            value = String(value);
        }
        /* RFC-4180
        6.  Fields containing line breaks (CRLF), double quotes, and commas should be enclosed in double-quotes.
        7.  If double-quotes are used to enclose fields, then a double-quote inside a field must be escaped by preceding it with
         another double quote. For example: "aaa","b""bb","ccc"
         In order to support something other than commas as delimiters, we will substitute delimiter for comma in rule 6,
         although use of a double quotes or CRLF as delimiter is unsupported. */
        if (needsQuoteWrapping.test(value)) {
            return "\"".concat(value.replace(/"/g, '""'), "\"");
        }
        else {
            return value;
        }
    })
        .join(delimiter);
};
var getAllUniqueKeys = function (data) {
    var keys = new Set();
    for (var _i = 0, data_1 = data; _i < data_1.length; _i++) {
        var row = data_1[_i];
        for (var key in row) {
            if (row.hasOwnProperty(key)) {
                keys.add(key);
            }
        }
    }
    return Array.from(keys);
};
export var csvGenerate = function (data, headers, delimiter) {
    var headerKeys = headers !== null && headers !== void 0 ? headers : getAllUniqueKeys(data);
    var headerRow = headerKeys.map(function (header) {
        return typeof header === "string" ? header : header.label;
    });
    var csv = data.map(function (row) { return csvGenerateRow(row, headerKeys, delimiter); });
    csv.unshift(headerRow.join(delimiter));
    return csv.join("\r\n");
};