Use Prettier API (Node.js)

prettier.js

const fs = require('fs');
const glob = require('glob');
const prettier = require('prettier');
const path = require('path');

// equivalent to "prettier --ignore-path .gitignore "**/*.{json,md,scss}" --list-different"
const editorConfig = path.join(process.cwd(), '.editorconfig');
const filePattern = '**/*.{json,md,scss}';
const gitIgnore = path.join(process.cwd(), '.gitignore');


glob(filePattern, undefined, async (globError, files) => {
  if (globError) {
    throw globError;
  }

  const hasEditorConfig = fs.existsSync(editorConfig) ? true : false;
  const resolvingOptions = {
    editorconfig: hasEditorConfig,
    useCache: true
  };
  const formattingOptions = await prettier.resolveConfig(process.cwd(), resolvingOptions);

  files.forEach(async fileName => {
    const filePath = fileName;
    const fileInfoOptions = {
      ignorePath: gitIgnore,
      withNodeModules: false
    };
    const fileInfo = await prettier.getFileInfo(filePath, fileInfoOptions);

    if (fileInfo.ignored) {
      console.log(`Skipping file "${filePath}"...`);
      return;
    }

    console.log(`Processing file "${filePath}"...`);

    formattingOptions.parser = fileInfo.inferredParser;
    const sourceCode = fs.readFileSync(filePath, 'utf8');
    const isPretty = prettier.check(sourceCode, formattingOptions);
    if (!isPretty) {
      const formatted = prettier.format(sourceCode, formattingOptions);
      fs.writeFileSync(filePath, formatted, {encoding: 'utf8'});
      console.log(`Formatted  file "${filePath}"`);
    }
  });
});