closest-file-data/dist/index.js

Allow to find and retrieve some data (such as config file) related to a given path (with cache)

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const fs_1 = require("fs");
const path_1 = require("path");
let caches = Object.create(null);
function closestFileData(relPath, oneOrMoreReader) {
    const paths = [];
    const readers = Array.isArray(oneOrMoreReader) ? oneOrMoreReader : [oneOrMoreReader];
    if (readers.length < 1) {
        throw new RangeError(`At least one reader must be given.`);
    }
    // cache key is based on the ordered list of basenames
    const cacheKey = readers.map(r => r.basename).join('::');
    if (!(cacheKey in caches)) {
        caches[cacheKey] = Object.create(null);
    }
    const cache = caches[cacheKey];
    let result;
    let directory = relPath;
    do {
        if (directory in cache) {
            result = cache[directory];
            break;
        }
        paths.push(directory);
        // look for a config using readers (config file must exists and reader must not return null)
        readers.find(({ basename, read }) => {
            const path = path_1.join(directory, basename);
            if (fs_1.existsSync(path)) {
                const config = read(path);
                if (typeof config !== 'undefined') {
                    result = Object.freeze({ path, data: config });
                    return true;
                }
            }
            return false;
        });
        // continue while we don't have a config and there is a parent directory
    } while (!result && directory !== (directory = path_1.dirname(directory))); // tslint:disable-line
    // each directory will resolve to the same config
    paths.forEach(d => (cache[d] = result));
    return result;
}
exports.default = Object.assign(closestFileData, {
    cache: {
        clear: () => (caches = Object.create(null)),
    },
});