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tsc --init with --lib produces broken tsconfig.json #10289

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@DanielRosenwasser

Description

@DanielRosenwasser

Step 1:

tsc --init --lib es5,es2015

Produces:

{
    "compilerOptions": {
        "lib": [
            "lib.es5.d.ts",
            "lib.es2015.d.ts"
        ],
        "module": "commonjs",
        "target": "es5",
        "noImplicitAny": false,
        "sourceMap": false
    },
    "exclude": [
        "node_modules"
    ]
}

which is broken because those are not valid values for lib.

This should produce

{
    "compilerOptions": {
        "lib": [
            "es5",
            "es2015"
        ],
        "module": "commonjs",
        "target": "es5",
        "noImplicitAny": false,
        "sourceMap": false
    },
    "exclude": [
        "node_modules"
    ]
}

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