Add readonly for all possible function parameter for lib.dom.d.ts

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library, dom

Suggestion

Add readonly for all possible function parameter for lib.dom.d.ts

Examples

Here is an example for add readonly props for constructor:

declare var URLSearchParams: {
    prototype: URLSearchParams;
    new(init?: string[][] | Record<string, string> | string | URLSearchParams): URLSearchParams;
    toString(): string;
};

It should be

declare var URLSearchParams: {
    prototype: URLSearchParams;
    new(init?: ReadonlyArray<readonly [string,string]> | Readonly<Record<string, string>> | string | URLSearchParams): URLSearchParams;
    toString(): string;
};

then I can use

const myGlobalConfig = {
    myURLSearchParamsInit1: [['foo','bar']],
    myURLSearchParamsInit2: {foo:'bar'}
} as const;
const params = new URLSearchParams(myGlobalConfig.myURLSearchParamsInit1)

Start by reading the lib.dom.d.ts URLSearchParams declaration and compare its constructor parameter types with the readonly example in the issue. Determine which other function parameters are eligible and how broadly the change should apply. Done means the relevant lib.dom.d.ts declarations consistently accept readonly inputs without changing their intended API.