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A JS Foundation Project

TypeScript target

TypeScript target (target)

typescript-config/target takes into account your webhint‘s browserslist configuration and warns you if your target (es3, es2015, etc.) is appropriate.

Why is this important?

Not having the right ES target can increase the size of your bundle. At the same time, having an ES target that not all the browsers you care support can create issues with your users.

What does the hint check?

This hint checks if the compilerOptions property target is the appropriate based on your browserslist configuration.

The matrix is as follows:

Target Chrome Edge Firefox Internet
Explorer
Safari
ES3
ES5 5 4 9 5
ES2015 49 13 37 10
ES2016 57 14 52 10.1
ES2017 58 16 53 10.1
ESNext

Browsers not in this list will be ignored if they are in your browserslist.

Keep in mind that this is an approximative list. I.E.: There are still features of ES2015 that haven’t been implemented in all browsers, but the numbers above should give you good support for the most common ones.

The following sites were used to create this table:

Examples that trigger the hint

Having a target not supported by all your targeted browsers:

tsconfig.json:

{
    ...
    "compilerOptions": {
        "target": "es5",
        ...
    },
    ...
}

.hintrc:

{
    ...
    "browserslist": ["IE 8"]
    ...
}

Having a target that is lower than what all your browsers support:

tsconfig.json:

{
    ...
    "compilerOptions": {
        "target": "es3",
        ...
    },
    ...
}

.hintrc:

{
    ...
    "browserslist": ["Chrome 64", "Edge 16", "Firefox 60"]
    ...
}

Examples that pass the hint

The right target for the right browsers:

tsconfig.json:

{
    ...
    "compilerOptions": {
        "target": "es3",
        ...
    },
    ...
}

.hintrc:

{
    ...
    "browserslist": ["IE 8"]
    ...
}

Further Reading