Array.prototype.includes not being pollyfilled in target es5

[Mister-Hope]

TypeScript Version: 3.6.2

Search Terms:
Array.prototype includes

Code

    resolvePath= (name: string) =>
      ['main', 'function', 'guide', 'me', 'search'].includes(name)
        ? `/page/${name}`
        : ['weather', 'map', 'situs', 'PEcal', 'player', 'video'].includes(name)
          ? `/function/${name}`
          : `/module/${name}`
// A *self-contained* demonstration of the problem follows...
// Test this by running `tsc` on the command-line, rather than through another build tool such as Gulp, Webpack, etc.

My compilerOptions:

"compilerOptions": {
    "locale": "zh-CN",
    "target": "es5",
    "module": "CommonJS",
    "importHelpers": true,
    "moduleResolution": "node",
    "strictNullChecks": true,
    "noImplicitAny": true,
    "lib": [
      "es6",
      "es2017"
    ],
    "allowJs": false,
    "experimentalDecorators": true,
    "noImplicitThis": true,
    "noImplicitReturns": true,
    "alwaysStrict": true,
    "noFallthroughCasesInSwitch": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "strict": true,
    "removeComments": true,
    "pretty": true,
    "allowSyntheticDefaultImports": false,
    "esModuleInterop": true,
    "strictPropertyInitialization": true
  },

Expected behavior:

array.includes being pollyfilled since target es5 does not have inlucdes function

Actual behavior:

        resolvePath= function (name) {
            return ['main', 'function', 'guide', 'me', 'search'].includes(name)
                ? "/page/" + name
                : ['weather', 'map', 'situs', 'PEcal', 'player', 'video'].includes(name)
                    ? "/function/" + name
                    : "/module/" + name;
        }

Playground Link:

Related Issues:
I found #26255
But it is not my case.

[MartinJohns]

TypeScript is only adding polyfills for syntax features (e.g. class), but not more. The lib section of the compiler options is only for having the types available.

#26087 (comment)

[Mister-Hope]

Thanks, btw, whatcan I do to completelly transfrom to es5 when running tsc?
How can I use babel?
I found this blog but the content is not clear for me
https://devblogs.microsoft.com/typescript/typescript-and-babel-7/

[Mister-Hope]

In my project, I only use tsc to male all my ts compile to js and place them in the folder where their ts file locates.
How should I run babel to do that?

[IllusionMH]

You should include core-js module(s) to polyfill missing runtime features
https://github.com/zloirock/core-js