Usage with ts-jest

As far as I understood, ts-jest supports typescript transformers with the astTransformers option. I tried to make it work like this in my jest.config.js:

  globals: {
    'ts-jest': {
      astTransformers: {
        before: ['ts-transformer-keys/transformer'],
      },
    },
  },

This did not work and results in the error TypeError: ts_transformer_keys_1.keys is not a function, which happens when the transform is not being applied. Any ideas?

[EdNutting]

This was brilliant - thank you! Never would’ve figured out how to get this working without your solution.

[DamianPereira]

I managed to do it, I had to create a file like this:

// ts-jest-keys-trasnformer.js
const keysTransformer = require('ts-transformer-keys/transformer').default;
const name = 'my-key-transformer';
const version = 1;
const factory = (cs) => (ctx) => keysTransformer(cs.tsCompiler.program)(ctx);
module.exports = { name, version, factory };

And add it in jest.config.js like this:

  globals: {
        'ts-jest': {
          // relative path to the ts-jest-keys-transformer.js file
          astTransformers: ['src/react/ts-jest-keys-transformer.js'],
        },
      },

I’ll create a PR adding an example and documentation