next/dist/esm/lib/find-config.js

The React Framework

import findUp from 'next/dist/compiled/find-up';
import { readFile } from 'fs/promises';
import JSON5 from 'next/dist/compiled/json5';
import { pathToFileURL } from 'url';
export function findConfigPath(dir, key) {
    // If we didn't find the configuration in `package.json`, we should look for
    // known filenames.
    return findUp([
        `.${key}rc.json`,
        `${key}.config.json`,
        `.${key}rc.js`,
        `${key}.config.js`,
        `${key}.config.mjs`,
        `${key}.config.cjs`
    ], {
        cwd: dir
    });
}
// We'll allow configuration to be typed, but we force everything provided to
// become optional. We do not perform any schema validation. We should maybe
// force all the types to be `unknown` as well.
export async function findConfig(directory, key, _returnFile) {
    // `package.json` configuration always wins. Let's check that first.
    const packageJsonPath = await findUp('package.json', {
        cwd: directory
    });
    let isESM = false;
    if (packageJsonPath) {
        try {
            const packageJsonStr = await readFile(packageJsonPath, 'utf8');
            const packageJson = JSON.parse(packageJsonStr);
            if (typeof packageJson !== 'object') {
                throw new Error() // Stop processing and continue
                ;
            }
            if (packageJson.type === 'module') {
                isESM = true;
            }
            if (packageJson[key] != null && typeof packageJson[key] === 'object') {
                return packageJson[key];
            }
        } catch  {
        // Ignore error and continue
        }
    }
    const filePath = await findConfigPath(directory, key);
    const esmImport = (path)=>{
        // Skip mapping to absolute url with pathToFileURL on windows if it's jest
        // https://github.com/nodejs/node/issues/31710#issuecomment-587345749
        if (process.platform === 'win32' && !process.env.JEST_WORKER_ID) {
            // on windows import("C:\\path\\to\\file") is not valid, so we need to
            // use file:// URLs
            return import(pathToFileURL(path).toString());
        } else {
            return import(path);
        }
    };
    if (filePath) {
        if (filePath.endsWith('.js')) {
            if (isESM) {
                return (await esmImport(filePath)).default;
            } else {
                return require(filePath);
            }
        } else if (filePath.endsWith('.mjs')) {
            return (await esmImport(filePath)).default;
        } else if (filePath.endsWith('.cjs')) {
            return require(filePath);
        }
        // We load JSON contents with JSON5 to allow users to comment in their
        // configuration file. This pattern was popularized by TypeScript.
        const fileContents = await readFile(filePath, 'utf8');
        return JSON5.parse(fileContents);
    }
    return null;
}

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