createSourceCode(file, parseResult) {
		return new MarkdownSourceCode({
			text: /** @type {string} */ (file.body),
			ast: parseResult.ast,
		});
	}
Creates a new `MarkdownSourceCode` object from the given information.
@param {File} file The virtual file to create a `MarkdownSourceCode` object from.
@param {OkParseResult} parseResult The result returned from `parse()`.
@returns {MarkdownSourceCode} The new `MarkdownSourceCode` object.