old_contents: /** @type {import('ts-jest/dist/types').InitialOptionsTsJest} */
  module.exports = {
    preset: 'ts-jest',
    testEnvironment: 'node',
  };
  
new_contents: /** @type {import('ts-jest/dist/types').InitialOptionsTsJest} */
  module.exports = {
    preset: 'ts-jest',
    testEnvironment: 'node',
    globals: {'ts-jest': {isolatedModules: true}},
  };
  
subject: disable typechecking in tests