Caching mechanism works inproperly

[lo-tp]

Do you want to request a feature or report a bug?

I want to report a bug.

What is the current behavior?

When setting the transform argument, the transformation works smoothly.

However, when the argument is changed, the code is not transformed again.
This can be a tricky problem to be debugged.

If the current behavior is a bug, please provide the steps to reproduce and either a repl.it demo through https://repl.it/languages/jest or a minimal repository on GitHub that we can yarn install and yarn test.

Clone this repo and follow the README to see the bug.

What is the expected behavior?

Whenever the transform argument is changed, the code should be retransformed.

Please provide your exact Jest configuration and mention your Jest, node, yarn/npm version and operating system.

My Jest configuration:

{
  "moduleDirectories": ["node_modules", "src"],
    "moduleFileExtensions": [
      "ts",
      "tsx",
      "js",
      "json"
    ],
  "collectCoverage": true,
  "collectCoverageFrom" : ["src/**/*.{ts,tsx}"],
    "transform": {
      "\\.(ts|tsx)$": "<rootDir>/node_modules/ts-jest/preprocessor.js"
    },
  "coverageDirectory": "coverage",
  "coverageReporters": ["html", "text"],
  "testMatch": [
    "**/?(*.)(spec|test).ts?(x)"
  ],
  "moduleNameMapper": {
    "\\.(scss)|(less)$": "<rootDir>/node_modules/jest-css-modules"
  }
}

I was using jest v19.0.2, node v7.7.3 and yarn v0.18.1 .

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