Issue with rest operator behavior in TypeScript when targeting es2018

This specific code snippet functions properly in the TypeScript Playground...

class Foo {
    constructor(...args: any[]) {

    }

    static make(...args: any[]): Foo {
        return new Foo(...args);
    }
}

Example

However, when trying to incorporate it into a TypeScript project in Visual Studio, it encounters issues. The error prompted for args within the line return new Foo(...args); is:

Type must have a 'Symbol.iterator' method that returns an iterator.

What could be causing this discrepancy?

The local machine is using TypeScript version 2.7. The issue arises once the build target is switched to es2018

typescript

Answer №1

It seems like there is a bug in the compiler's default lib for es2018. According to the compiler code at the time of writing:

export function getDefaultLibFileName(options: CompilerOptions): string {
    switch (options.target) {
        case ScriptTarget.ESNext:
            return "lib.esnext.full.d.ts";
        case ScriptTarget.ES2017:
            return "lib.es2017.full.d.ts";
        case ScriptTarget.ES2016:
            return "lib.es2016.full.d.ts";
        case ScriptTarget.ES2015:
            return "lib.es6.d.ts";  // We avoid using lib.es2015.full.d.ts due to a breaking change.
        default:
            return "lib.d.ts";
    }
}

The es2018 option is not included. You can manually specify the appropriate lib as follows:

{
    "compilerOptions": {
        "target": "es2018",
        "lib": [
            "es2018",
            "dom"
        ]
    }
}

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