next/dist/esm/build/next-config-ts/require-hook.js

The React Framework

import Module from 'node:module';
import { readFileSync } from 'node:fs';
import { dirname } from 'node:path';
const oldJSHook = require.extensions['.js'];
const extensions = [
    '.ts',
    '.cts',
    '.mts',
    '.cjs',
    '.mjs'
];
export function registerHook(swcOptions) {
    // lazy require swc since it loads React before even setting NODE_ENV
    // resulting loading Development React on Production
    const { transformSync } = require('../swc');
    require.extensions['.js'] = function(mod, oldFilename) {
        try {
            return oldJSHook(mod, oldFilename);
        } catch (error) {
            if (error.code !== 'ERR_REQUIRE_ESM') {
                throw error;
            }
            // calling oldJSHook throws ERR_REQUIRE_ESM, so run _compile manually
            // TODO: investigate if we can remove readFileSync
            const content = readFileSync(oldFilename, 'utf8');
            const { code } = transformSync(content, swcOptions);
            mod._compile(code, oldFilename);
        }
    };
    for (const ext of extensions){
        const oldHook = require.extensions[ext] ?? oldJSHook;
        require.extensions[ext] = function(mod, oldFilename) {
            const _compile = mod._compile;
            mod._compile = function(code, filename) {
                const swc = transformSync(code, swcOptions);
                return _compile.call(this, swc.code, filename);
            };
            return oldHook(mod, oldFilename);
        };
    }
}
export function deregisterHook() {
    require.extensions['.js'] = oldJSHook;
    extensions.forEach((ext)=>delete require.extensions[ext]);
}
export function requireFromString(code, filename) {
    const paths = Module._nodeModulePaths(dirname(filename));
    const m = new Module(filename, module.parent);
    m.paths = paths;
    m._compile(code, filename);
    return m.exports;
}

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