facebook/jscodeshift v0.3.20

on GitHub

New

• --ignore-pattern and --ignore-file command line arguments, which allow you to specify paths to ignore when using jscodeshift to traverse over a dictionary ( #107 , @chrisdarroch )

• jscodeshift.use which you can pass a plugin too. A plugin would a function that accepts a jscodeshift instance and calls registerMethods on it. This allows plugins to be decoupled form jscodeshift. In addition, if .use is called with the same plugin multiple times, subsequent calls are ignored.

  Example:

  function myPlugin(jscodeshift) {
    jscodeshift.registerMethods({
      myExtension() { ... },
    }, jscodeshift.Identifier);
  }
  
  jscodeshift.use(myPlugin);

  ( #108 , @jamestalmage )

• Better registerMethods method! Until now, it was impossible to register two methods with the same name, even if it was attached to different types (and therefore, conceptually, different collections). @jamestalmage changed this in #110 and and now it's possible to register such methods if the types are not super- or sub-types.

  Example:

  jscodeshift.registerMethods({
    rename() { ... },
  }, j.Identifier);
  
  jscodeshift.registerMethods({
    rename() { ... },
  }, j.VariableDeclarator);

• Unit tests for transforms: @Daniel15 added helper methods to make writing unit tests easier ( #104 ) . See the readme and the example for more information.

  This results in a directory structure like this:

    /MyTransform.js
    /__tests__/MyTransform-test.js
    /__testfixtures__/MyTransform.input.js
    /__testfixtures__/MyTransform.output.js
  

  To define a test, use defineTest from the testUtils module:

    jest.autoMockOff();
    const defineTest = require('jscodeshift/dist/testUtils').defineTest;
    defineTest(__dirname, 'MyTransform');