Is it possible to set TypeScript compiler options that aren't listed in the tsconfig.json file

Issue

For a while, my application compiled and ran smoothly in the browser. However, after I installed and uninstalled typings and npm's @types/*, my original app started encountering compilation errors despite no changes in the code or tsconfig.json.

Inquiry

I'm perplexed by this sudden change in behavior from the TS compiler. What could be causing these differences?

Specifics

  1. Upon successfully compiling the initial code, I proceeded to install typings.
  2. I added a definition using 
    typings install dt~amodule --global --save
  3. Next, I opted for an npm-based solution for missing type definitions: npm install --save-dev amodule
  4. I made updates to utilize the npm definition
  5. Following that, I reverted all changes with git and manually removed the typings folder. Additionally, I uninstalled @types/amodule and global typings using npm uninstall.
  6. Now, errors are appearing in components and libraries that were not even modified during this process.
typescriptnpmtypescript-typings

Answer №1

Root Cause

The issue arose when typescript was initially installed using npm with a flexible version in the package.json, such as:

"devDependencies": {
    "typescript": "^2.1.5"
}

After running npm install, the typescript version within the project got updated without any prior notification.

Resolution

To tackle this problem, it was necessary to lock the typescript version by modifying the package.json and then executing npm install again.

"devDependencies": {
    "typescript": "2.1.5"
}

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