Function buildMap

lib/usage.js:3–19

(list, caseInsensitive)

const { hasOwnProperty } = Object.prototype;

function buildMap(list, caseInsensitive) {
    const map = Object.create(null);

    if (!Array.isArray(list)) {
        return null;
    }

    for (let name of list) {
        if (caseInsensitive) {
            name = name.toLowerCase();
        }

        map[name] = true;
    }

    return map;
}

function buildList(data) {
    if (!data) {