csv-parse/lib/api/normalize_columns_array.js

CSV parsing implementing the Node.js `stream.Transform` API

import { CsvError } from "./CsvError.js";
import { is_object } from "../utils/is_object.js";

const normalize_columns_array = function (columns) {
  const normalizedColumns = [];
  for (let i = 0, l = columns.length; i < l; i++) {
    const column = columns[i];
    if (column === undefined || column === null || column === false) {
      normalizedColumns[i] = { disabled: true };
    } else if (typeof column === "string") {
      normalizedColumns[i] = { name: column };
    } else if (is_object(column)) {
      if (typeof column.name !== "string") {
        throw new CsvError("CSV_OPTION_COLUMNS_MISSING_NAME", [
          "Option columns missing name:",
          `property "name" is required at position ${i}`,
          "when column is an object literal",
        ]);
      }
      normalizedColumns[i] = column;
    } else {
      throw new CsvError("CSV_INVALID_COLUMN_DEFINITION", [
        "Invalid column definition:",
        "expect a string or a literal object,",
        `got ${JSON.stringify(column)} at position ${i}`,
      ]);
    }
  }
  return normalizedColumns;
};

export { normalize_columns_array };