@howto/browser-modules/dist/index.esm.js

A sample repo demonstrating package.json config for a browser module published to NPM

/**
 * Returns the sum of an unbounded array of integers
 */
function sum() {
    var numbers = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        numbers[_i] = arguments[_i];
    }
    var parsed = numbers.map(function (num) { return parseInt(num, 10); });
    if (parsed.some(function (num) { return isNaN(num); })) {
        throw new Error("Invalid numbers passed to `sum`");
    }
    return parsed.reduce(function (a, b) { return a + b; });
}
/**
 * Returns the difference of 2 integers
 */
function difference() {
    var numbers = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        numbers[_i] = arguments[_i];
    }
    if (numbers.length !== 2) {
        throw new Error("Incorrect number of parameters passed to `difference`");
    }
    var start = numbers[0], end = numbers[1];
    if (start === undefined ||
        start === null ||
        end === undefined ||
        end === null) {
        throw new Error("`start` and `end` values not properly passed");
    }
    start = parseInt(start, 10);
    end = parseInt(end, 10);
    if (isNaN(start))
        throw new Error("`start` is not a valid integer");
    if (isNaN(end))
        throw new Error("`end` is not a valid integer");
    return Math.abs(end - start);
}

export { difference, sum };
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