Package Exports

gen-codemod

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (gen-codemod) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

gen-codemod

Generate codemods via initial -> desired JavaScript.

Install

npm i -g gen-codemod

Usage

echo "sinon.stub(A, B, C)" > initial.js
echo "sinon.stub(A, B).andCallFake(C)" > desired.js
gen-codemod initial.js desired.js

outputs:

module.exports = function(file, api) {
  const j = api.jscodeshift;

  const rootProperties = {
    type: 'CallExpression',
    callee: {
      type: 'MemberExpression',
      object: { type: 'Identifier', name: 'sinon' },
      property: { type: 'Identifier', name: 'stub' },
      computed: false
    },
    arguments: [{}, {}, {}]
  };

  function getTransform(path) {
    return j.callExpression(
      j.memberExpression(
        j.callExpression(
          j.memberExpression(
            j.identifier('sinon'),
            j.identifier('stub'),
            false
          ),
          [j.identifier('A'), j.identifier('B')]
        ),
        j.identifier('andCallsFake'),
        false
      ),
      [j.identifier('C')]
    );
  }

  function getANode(path) {
    return path.node.arguments[0];
  }
  function getBNode(path) {
    return path.node.arguments[1];
  }
  function getCNode(path) {
    return path.node.arguments[2];
  }

  return j(file.source)
    .find(j.CallExpression, rootProperties)
    .replaceWith(getTransform)
    .toSource();
};

Variables are specified as single uppercase letters, such as A, B, C, etc

To save and run your codemod, use jscodeshift:

gen-codemod INITIAL.js DESIRED.js > my-transform.js
npx jscodeshift -t my-transform.js PATH_TO_TRANSFORM