Typescript can't compile success while using some Symbol attributes

[MSDimos]

TypeScript Version: 2.6.2

Code

class Ite {

    [Symbol.toPrimitive](hint): number | string {
        switch (hint) {
            case 'number':
                return 100;
            case 'string':
                return "100";
            case "default":
                return "default";
            default:
                return null;
        }
    }
}
let ite: Ite = new Ite();

/*The following code hints the errors */
console.log(ite == 100);
console.log(ite + 100);
console.log(ite * 2);

Expected behavior:
JavaScript can run normally, and display the following content at the console

false
default100
200

but typescript can't compile success. And many of the rest of the Symbol attributes are not normally identified. Such as Symbol.species.

[kitsonk]

As the form noted, you need to provide a fully reproducible example.

You need to provide more basic information. What is your tsconfig.json or what arguments are you passing in tsc. When you say can't compile success what errors are you getting?

[MSDimos]

@kitsonk Thanks for your reply
This is my tsconfig.json

{
    "compilerOptions": {
        "target": "es2015",
        "module": "amd",
        "jsx": "react",
        "outDir": "./dist",
        "moduleResolution": "node"
    },
    "compileOnSave": true,
    "include": [
        "./*"
    ]

}

This is my package.json

{
  "name": "test",
  "version": "1.0.0",
  "main": "index.js",
  "dependencies": {
    "typescript": "^2.6.2"
  },
  "devDependencies": {},
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "build": "tsc index.ts"
  },
  "keywords": [],
  "author": "",
  "license": "ISC"
}

I added a command script in package.json, and using npm run build to run tsc index.ts.
and this is what error says

index.ts(3,6): error TS2304: Cannot find name 'Symbol'.
index.ts(19,13): error TS2365: Operator '==' cannot be applied to types 'Ite' and 'number'.
index.ts(20,13): error TS2365: Operator '+' cannot be applied to types 'Ite' and '100'.
index.ts(21,13): error TS2362: The left-hand side of an arithmetic operation must be of type 'any', 'number' or an enum type.

But the code is in accordance with the ES6 specification, and it is reasonable that it shouldn't be wrong.
Thank

[mhegazy]

Duplicate of #4538

[typescript-bot]

Automatically closing this issue for housekeeping purposes. The issue labels indicate that it is unactionable at the moment or has already been addressed.