fix: correct the return type of applyInlineConfig

[lumirlumir]

Prerequisites checklist

• I have read the contributing guidelines.

What is the purpose of this pull request?

What did you do?

I expected the return type of applyInlineConfig().configs — specifically loc.start and loc.end — to include an offset property, but they don't. Also loc.source is missing.

What did you expect to happen?

I expect the types of loc.start and loc.end to include an offset property, and for loc.source to be present.

Link to minimal reproducible Example

import { CSSSourceCode, CSSLanguage } from "./src/index.js";

const file = {
	body: '/* eslint css/no-important: "error" */',
	path: "test.css",
};
const language = new CSSLanguage();
const parseResult = language.parse(file);
const cssSourceCode = new CSSSourceCode({
	text: file.body,
	ast: parseResult.ast,
	comments: parseResult.comments,
});

console.log(cssSourceCode.applyInlineConfig().configs[0].loc);

If you run the code above, you'll see that cssSourceCode.applyInlineConfig().configs[0].loc.start and cssSourceCode.applyInlineConfig().configs[0].loc.end include an offset property. However, the return type doesn't reflect that offset property. Also, cssSourceCode.applyInlineConfig().configs[0].loc.source is missing from the return type.

# Output
{
  source: 'test.css',
  start: { offset: 0, line: 1, column: 1 },
  end: { offset: 38, line: 1, column: 39 }
}

What changes did you make? (Give an overview)

Looking at the origin of the loc property returned by applyInlineConfig, you'll find that it directly uses the comment.loc.

css/src/languages/css-source-code.js

Line 227 in d0d58c5

loc: comment.loc,

The comment.loc property uses the CssLocationRange type from @eslint/css-tree as shown below, so technically it doesn’t match the SourceLocation type.

• CssLocationRange

interface CssLocationRange {
    source: string;
    start: {
        line: number;
        column: number;
        offset: number;
    }
    end: {
        line: number;
        column: number;
        offset: number;
    }
}

• SourceLocation

interface SourceLocation {
    start: {
        line: number;
        column: number;
    }
    end: {
        line: number;
        column: number;
    }
}

To provide a more accurate return type, I've replaced the SourceLocation type with the CssLocationRange type from @eslint/css-tree.

Related Issues

Ref: eslint/markdown#548, eslint/json#162

Is there anything you'd like reviewers to focus on?

N/A

[fasttime]

LGTM, thanks!