find-and-read-package-json/lib/index.js

Find and read data from a package.json file.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const fs = require("fs");
const path = require("path");
function findAndReadPackageJson(directory, options = {}) {
    return new Promise((resolve, reject) => {
        const file = path.join(directory, 'package.json');
        // read the JSON from the cache
        if (typeof options.cache === 'object' && options.cache[file]) {
            resolve(options.cache[file]);
        }
        fs.readFile(file, (error, data) => {
            if (error) {
                // check if we're at the root of the filesystem
                if (directory === '/' || (process.platform === 'win32' && /^\w:[\\\/]*$/.test(directory))) {
                    // we are already at the the root of the filesystem so there are no parent directories to look for
                    // the `package.json` in
                    reject(new Error(`No "package.json" file found in "${directory}".`));
                }
                else {
                    // look for the `package.json` in the parent directory
                    resolve(findAndReadPackageJson(path.dirname(directory), options));
                }
            }
            else {
                // parse the `package.json`
                let json = JSON.parse(data.toString());
                // transform the JSON
                if (typeof options.transform === 'function') {
                    json = options.transform(json);
                }
                // write the JSON to the cache
                if (typeof options.cache === 'object') {
                    options.cache[file] = json;
                }
                resolve({
                    file,
                    json
                });
            }
        });
    });
}
exports.default = findAndReadPackageJson;
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