The compiler does not recognize the TSConfig option 'lib' - please review and correct

I have inherited an angular 1 project written in typescript version 1.8.10.

However, I am encountering compilation issues with the following error message:

Unknown compiler option 'lib'

If I remove the "lib" line, a cascade of other errors such as:

Property 'X' does not exist on type 'Y'

This project is quite complex and old, but I only need it to work for the next 2 weeks. Unfortunately, rewriting the whole project from scratch is not feasible given the time constraints.

I have attempted various versions of TypeScript, but the same issue persists. I also tried building with the --noImplicitUseStrict flag, but to no avail.

Below are excerpts from my tsconfig.json and package.json files:

tsconfig.json

{
  "compileOnSave": false,
  "compilerOptions": {
      "module": "commonjs",
      "target": "es5",
      "noImplicitUseStrict" : true,
      "lib": ["es2015", "dom"]
 },
  "exclude": [
      "bower_components",
      "node_modules",
      "typings"
  ]
}

{
  "name": "xxx",
  "version": "0.0.0",
  // Dependencies and scripts truncated for brevity
}

I would really appreciate any guidance or advice on how to resolve this issue. The project is being built using Gulp.

Answer №1

For me, it slipped my mind to run npm install before executing npm build. This tip could be useful for someone else facing a similar issue.

Answer №2

One feature in TypeScript 2 is the lib, but since you are on version 1.8, you may want to consider removing it from your tsconfig.json file or upgrading to a newer version of TypeScript.

In my package.json file, I have specified the following dev dependencies:

"ts-loader": "^5.4.4",
"typescript": "^3.4.5",

Keep in mind that there might be some breaks in your existing TypeScript code if you decide to upgrade.

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