message: Process JS files if `allowJs` flag is `true`
  resolves 133
diff: @@ -6,11 +6,20 @@ const glob = require('glob-all');
  const nodepath = require('path');
  export function process(src, path, config) {
  - if (path.endsWith('.ts') || path.endsWith('.tsx')) {
  + const compilerOptions = getTSConfig(config.globals, config.collectCoverage);
  +
  + const isTsFile = path.endsWith('.ts') || path.endsWith('.tsx');
  + const isJsFile = path.endsWith('.js') || path.endsWith('.jsx');
  +
  + const processFile = compilerOptions.allowJs === true
  + ? isTsFile || isJsFile
  + : isTsFile;
  +
  + if (processFile) {
  const transpiled = tsc.transpileModule(
  src,
  {
  - compilerOptions: getTSConfig(config.globals, config.collectCoverage),
  + compilerOptions: compilerOptions,
  fileName: path
  });
  