Get a list of all Prettier-able files in a repo.

prettiest.mjs

import { execSync } from "node:child_process";
import path from "node:path";

import minimatch from "minimatch";
import prettier from "prettier";

const ignores = [
  ".circleci/**",
  ".github/**",
  ".vscode/**",
  ".yarn/**",
  "docs/**",
  "**/CHANGELOG.md",
  "**/README.md",
  "**/ansible/**",
];

const files = getPrettyableFiles(ignores);
console.log(files.join("\n"));

const exts = getPrettyableExts(files);
console.log(exts);

function getPrettyableFiles(ignores = []) {
  const supportedExts = getSupportedExts();
  return gitLsFiles().filter((file) => {
    for (const rule of ignores) {
      if (minimatch(file, rule, { dot: true })) {
        return false;
      }
    }
    const ext = path.extname(file);
    return supportedExts.has(ext);
  });
}

function gitLsFiles() {
  return execSync("git ls-files").toString().trim().split("\n");
}

function getPrettyableExts(files = []) {
  const extMap = new Map();
  for (const file of files) {
    const ext = path.extname(file);
    const count = extMap.get(ext) || 0;
    extMap.set(ext, count + 1);
  }
  return extMap;
}

function getSupportedExts() {
  const { languages } = prettier.getSupportInfo();
  const lintables = languages.reduce((acc = [], lang = {}) => {
    return acc.concat(lang.extensions);
  }, []);
  return new Set(lintables.sort());
}

Map(15) {
  '.css' => 9,
  '.gql' => 1,
  '.handlebars' => 1,
  '.hbs' => 1,
  '.html' => 20,
  '.js' => 1452,
  '.json' => 247,
  '.md' => 34,
  '.mjml' => 72,
  '.mjs' => 3,
  '.scss' => 80,
  '.ts' => 651,
  '.tsx' => 320,
  '.yaml' => 2,
  '.yml' => 3,
}