export function isDefined(v) {
    return v !== undefined;
}
export function isUndefined(v) {
    return v === undefined;
}
export function isString(v) {
    return typeof v === 'string';
}
export function isNumber(v) {
    return typeof v === 'number';
}
export function isBoolean(v) {
    return typeof v === 'boolean';
}