Difference in the 'lib' property in tsconfig.json between es6 and es2017?

问题

I've been researching what the possible values of the lib property mean in the compilerOptions found within the tsconfig.json file. I found on the Typescript GitHub page the relevant d.ts files corresponding to those values and apparently by using ES2017 the following ES features are included:

/// <reference path="lib.es2016.d.ts" />
/// <reference path="lib.es2017.object.d.ts" />
/// <reference path="lib.es2017.sharedmemory.d.ts" />
/// <reference path="lib.es2017.string.d.ts" />
/// <reference path="lib.es2015.d.ts" />
/// <reference path="lib.es2016.array.include.d.ts" />
/// <reference path="lib.es2015.core.d.ts" />
/// <reference path="lib.es2015.collection.d.ts" />
/// <reference path="lib.es2015.generator.d.ts" />
/// <reference path="lib.es2015.iterable.d.ts" />
/// <reference path="lib.es2015.promise.d.ts" />
/// <reference path="lib.es2015.proxy.d.ts" />
/// <reference path="lib.es2015.reflect.d.ts" />
/// <reference path="lib.es2015.symbol.d.ts" />
/// <reference path="lib.es2015.symbol.wellknown.d.ts" />
/// <reference path="lib.es5.d.ts" />

But apparently ES6 is not included and has it's own file that doesn't reference anything. My question is, if anybody knows, is it safe to assume that by using es2017 I cover all the es6 functionality (from a typings perspective) or should that be included separately in the lib option?

For example, like this:

{
  ...
  "compilerOptions": {
    ...
    "lib": ["es2017", "dom"]
  },
  ...
  }
}

OR this:

{
  ...
  "compilerOptions": {
    ...
    "lib": ["es2017", "es6", "dom"]
  },
  ...
  }
}

回答1:

After some digging and comparing through the lib folder on the Typescript GitHub I have found that, using es6 in the lib property in the compilerOptions corresponds to the code found in these references:

/// <reference path="lib.es2015.core.d.ts" />
/// <reference path="lib.es2015.collection.d.ts" />
/// <reference path="lib.es2015.generator.d.ts" />
/// <reference path="lib.es2015.iterable.d.ts" />
/// <reference path="lib.es2015.promise.d.ts" />
/// <reference path="lib.es2015.proxy.d.ts" />
/// <reference path="lib.es2015.reflect.d.ts" />
/// <reference path="lib.es2015.symbol.d.ts" />
/// <reference path="lib.es2015.symbol.wellknown.d.ts" />
/// <reference path="lib.es5.d.ts" />
/// <reference path="lib.dom.d.ts" />
/// <reference path="lib.scripthost.d.ts.d.ts" />
/// <reference path="lib.dom.iterable.d.ts" />

so to answer my question, to correctly cover all the contents of es6 with es2017 that section of the tsconfig.json should look like this:

{
  ...
  "compilerOptions": {
    ...
    "lib": ["es2017", "dom", "dom.iterable", "scripthost"]
  },
  ...
  }
}

来源：https://stackoverflow.com/questions/43874096/difference-in-the-lib-property-in-tsconfig-json-between-es6-and-es2017