ruffle/web/packages/core/tools/bundle_texts.js

const replace = require("replace-in-file");
const fs = require("fs");

const bundled_texts = {};
const locales = [];

fs.readdirSync("texts", { withFileTypes: true }).forEach((entry) => {
    if (entry.isDirectory()) {
        locales.push(entry.name);
    }
});

// For build reproducibility, sort the locales to make sure we don't accidentally rearrange them on different machines.
// The actual order isn't important, just that it's the same.
locales.sort();

locales.forEach((locale) => {
    const files = [];
    fs.readdirSync("texts/" + locale, { withFileTypes: true }).forEach(
        (entry) => {
            if (entry.isFile() && entry.name.endsWith(".ftl")) {
                files.push(entry.name);
            }
        }
    );
    files.sort();
    if (files.length > 0) {
        bundled_texts[locale] = {};
        files.forEach((filename) => {
            bundled_texts[locale][filename] = fs
                .readFileSync("texts/" + locale + "/" + filename, "utf8")
                .replaceAll("\r\n", "\n");
        });
    }
});

const options = {
    files: "dist/**",
    from: [/\{\s*\/\*\s*%BUNDLED_TEXTS%\s*\*\/\s*}/g],
    to: [
        JSON.stringify(bundled_texts, null, 2).replace(
            // Escape most non-ASCII characters to prevent strings from looking broken on non-UTF-8 encoded pages.
            /[\u{0080}-\u{FFFF}]/gu,
            (char) => {
                const code = char.charCodeAt(0);
                if (code > 0xff) {
                    return `\\u${code.toString(16).padStart(4, "0")}`;
                } else {
                    return `\\x${code.toString(16)}`;
                }
            }
        ),
    ],
};

replace.sync(options);