@lusito/require-libs/dist/utils/copyAsset.js

Some libraries to setup require hooks

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.createCopyAsset = createCopyAsset;
const fs_1 = require("fs");
const crypto_1 = require("crypto");
const path_1 = require("path");
function createCopyAsset(assetDir, prefix) {
    const assetCache = {};
    (0, fs_1.mkdirSync)(assetDir, { recursive: true });
    return function copyAsset(filename) {
        let destination = assetCache[filename];
        if (!destination) {
            const fileBuffer = (0, fs_1.readFileSync)(filename);
            const hashSum = (0, crypto_1.createHash)("sha256");
            hashSum.update(fileBuffer);
            const hash = hashSum.digest("hex").substring(0, 8);
            const ext = (0, path_1.extname)(filename);
            const newFilename = `${(0, path_1.basename)(filename, ext)}-${hash}${ext}`;
            destination = prefix + newFilename;
            assetCache[filename] = destination;
            (0, fs_1.copyFileSync)(filename, (0, path_1.resolve)(assetDir, newFilename));
        }
        return destination;
    };
}