Looking to include es2019 lib in a v10 Angular project that was just updated? Here's how you can do it in Visual

My goal is to create a functional Angular v10 project utilizing the .flat() method on arrays. Our team recently completed an upgrade of our Angular project to version 10. The project, which now operates based on the Angular CLI, includes the following files at its root:

  1. tsconfig.base.json
  2. tsconfig.json

While everything is functioning correctly, our IDE (vs code) is issuing a warning:

Property 'flat' does not exist on type 'string[][]'.ts(2339)

Based on information from this response on Stack Overflow, it was suggested that adding es2019 to the lib property would resolve the issue. However, despite adding "es2019" to both tsconfig.base.json and tsconfig.json, the problem persists.

angulartypescriptvisual-studio-code

Answer №1

My situation was a bit different, as I had existing content in the "lib" folder. To update from 2018 to 2019, all I did was modify the year:

Before:

"lib": ["es2018", "dom"]

After:

"lib": ["es2019", "dom"]

(It took approximately 30-60 seconds for the changes to be recognized in my TypeScript files)

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