dependency-cruiser/src/cli/init-config/find-extensions.mjs

Validate and visualize dependencies. With your rules. JavaScript, TypeScript, CoffeeScript. ES6, CommonJS, AMD.

// @ts-check
/* eslint-disable security/detect-object-injection */
import { scannableExtensions } from "#extract/transpile/meta.mjs";
import getExtension from "#utl/get-extension.mjs";
import findAllFiles from "#utl/find-all-files.mjs";

/**
 * @param {Record<string,number>} pAll
 * @param {string} pExtension
 */
function reduceToCounts(pAll, pExtension) {
	if (pAll[pExtension]) {
		pAll[pExtension] += 1;
	} else {
		pAll[pExtension] = 1;
	}
	return pAll;
}

/**
 * @param {Record<string,number>} pCountsObject
 * @returns {(pLeft: string, pRight: string) => number}
 */
function compareByCount(pCountsObject) {
	return function compare(pLeft, pRight) {
		return pCountsObject[pRight] - pCountsObject[pLeft];
	};
}

/**
 * @param {string[]} pDirectories
 * @param {{baseDir?: string; ignoreFileContents?: string}=} pOptions
 * @returns {string[]}
 */
export default function findExtensions(pDirectories, pOptions) {
	const lOptions = {
		baseDir: process.cwd(),
		scannableExtensions,
		...pOptions,
	};

	const lExtensionsWithCounts = pDirectories
		.flatMap((pDirectory) =>
			findAllFiles(pDirectory, {
				baseDir: lOptions.baseDir,
				ignoreFileContents: lOptions?.ignoreFileContents,
			})
				.map(getExtension)
				.filter(Boolean),
		)
		.reduce(reduceToCounts, {});

	return Object.keys(lExtensionsWithCounts)
		.filter((pExtension) => lOptions.scannableExtensions.includes(pExtension))
		.sort(compareByCount(lExtensionsWithCounts));
}