Emit .d.ts to dist/ on build via "declaration" in tsconfig.json

[danbeam]

This is so folks can consume this code in a more type safe way.

cc @catc @lencioni

[codecov]

Codecov Report

Merging #323 (9d09bf8) into main (83ccb01) will not change coverage.
The diff coverage is n/a.

❗ Current head 9d09bf8 differs from pull request most recent head 79e95a3. Consider uploading reports for the commit 79e95a3 to get more accurate results

@@           Coverage Diff           @@
##             main     #323   +/-   ##
=======================================
  Coverage   92.09%   92.09%           
=======================================
  Files          26       26           
  Lines        1872     1872           
  Branches      392      392           
=======================================
  Hits         1724     1724           
  Misses        102      102           
  Partials       46       46           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 83ccb01...79e95a3. Read the comment docs.

[skovhus]

I'm curious to understand the use case here. So I assume you have a project where you want to load the transformers from a TypeScript node-based setup and execute jscodeshift from your side?

[danbeam]

I'm curious to understand the use case here. So I assume you have a project where you want to load the transformers from a TypeScript node-based setup and execute jscodeshift from your side?

We've built some codemods (in Typescript) that transform some internal testing infrastructure using some of the utils in jest-codemods. We initially added them directly to a fork of this project but it'd be much cleaner to use parts of jest-codemods as a library instead.

We upstreamed the Sinon codemod cuz that'd be helpful to others. But the rest wouldn't be (cuz the code they transform isn't publicly available).

[lencioni]

Correct me if I'm wrong @danbeam but I believe we are mostly (only?) using stuff from the utils directory in this way. I see things like this:

import finale from 'jest-codemods/dist/utils/finale';
import { findParentOfType } from 'jest-codemods/dist/utils/recast-helpers';
import { modifyVariableDeclaration } from 'jest-codemods/dist/utils/sinon-helpers';

and this:

import { api } from 'jest-codemods/dist/utils/test-helpers';

[skovhus]

Thanks for the additional context. I always wondered if some of the utilities here should be shipped as a separate package.

Especially the code mod CLI part that is now powering a lot of codemods (by copy pasting this and improving it). :)