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I am unable to understand the use of tsconfig.app.json in src folder in Angular-2 cli project. I know that tsconfig.json is use by typescript compiler, so why tsconfig.app.json?
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json file is a file of JSON format which allows us to point the root level files and different compiler options to setup that require to compile a TypeScript based projects. The existence of this file in a project specifies that the given directory is the TypeScript project folder root.
with --lib you can specify a list of built-in API declaration groups that you can chose to include in your project. For instance, if you expect your runtime to have support for Map, Set and Promise (e.g. most evergreen browsers today), just include --lib es2015. collection,es2015. promise.
There are a few tsconfig.json files in the standard angular project. Here are the one you have asked about:
tsconfig.json provides the base options that different config files derive from. tsconfig.app.json provides the options used when working with code in the app folder. This allows you to further customize the options from tsconfig.json
Other tsconfig files follow the same (base + customization) pattern.
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