tscodeshift is a toolkit for running codemods over multiple TS files. It borrows its ideas from jscodeshift in a shameless manner.
  Usage: tscodeshift <path>... [options]
  path     Files or directory or glob to transform
  Options:
    -t FILE, --transform FILE   Path to the transform file. Can be either a local path or url  [./transform.js]
    -d, --dry                   Dry run (no changes are made to files)
    -p, --print                 Print output, useful for development
Convert mocha tests to jest tests:
$ npm install tscodeshift
$ ./node_modules/.bin/tscodeshift -t ./node_modules/tscodeshift/dist/src/transforms/mocha.js 'tests/**/*.ts'