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// @ts-check

const fs = require("fs");

module.exports = needsUpdate;

/**

* @param {string | string[]} source

* @param {string | string[]} dest

* @returns {boolean}

*/

function needsUpdate(source, dest) {

if (typeof source === "string" && typeof dest === "string") {

if (fs.existsSync(dest)) {

const {mtime: outTime} = fs.statSync(dest);

const {mtime: inTime} = fs.statSync(source);

if (+inTime <= +outTime) {

return false;

}

}

}

else if (typeof source === "string" && typeof dest !== "string") {

const {mtime: inTime} = fs.statSync(source);

for (const filepath of dest) {

if (fs.existsSync(filepath)) {

const {mtime: outTime} = fs.statSync(filepath);

if (+inTime > +outTime) {

return true;

}

}

else {

return true;

}

}

return false;

}

else if (typeof source !== "string" && typeof dest === "string") {

if (fs.existsSync(dest)) {

const {mtime: outTime} = fs.statSync(dest);

for (const filepath of source) {

if (fs.existsSync(filepath)) {

const {mtime: inTime} = fs.statSync(filepath);

if (+inTime > +outTime) {

return true;

}

}

else {

return true;

}

}

return false;

}

}

else if (typeof source !== "string" && typeof dest !== "string") {

for (let i = 0; i < source.length; i++) {

if (!dest[i]) {

continue;

}

if (fs.existsSync(dest[i])) {

const {mtime: outTime} = fs.statSync(dest[i]);

const {mtime: inTime} = fs.statSync(source[i]);

if (+inTime > +outTime) {

return true;

}

}

else {

return true;

}

}

return false;

}

return true;

}