{
	...,
	"extendsDefinition": {
		"properties" : {
			"extends": {
				"description": "Path to base configuration file to inferit from. Requires TypeScript version 2.1 of later",
				"type": "string"
			}
		}
	},
	...,
}

extends?

• 파일(상대)경로명: string
• TypeScript 2.1 New Spec

// in PROJECT/base.json
{
	"compilerOptions": {
		"strict": true
	}
}

// in PROJECT/tsconfig.json
{
	"extends": "./base.json"
}

https://github.com/tsconfig/bases

npm install —save-dev @tsconfig/deno

{
	"extends": "@tsconfig/deno/tsconfig.json",
	...
}