import { Event } from "../../../base/common/event.js";
import { IDisposable } from "../../../base/common/lifecycle.js";
import { URI } from "../../../base/common/uri.js";
import { ILanguageIdCodec } from "../languages.js";
import { ILanguageExtensionPoint, ILanguageNameIdPair, ILanguageIcon, ILanguageSelection } from "./language.js";
export declare const ILanguageService: import("../../../platform/instantiation/common/instantiation.js").ServiceIdentifier<ILanguageService>;
export interface ILanguageService {
    readonly _serviceBrand: undefined;
    /**
    * A codec which can encode and decode a string `languageId` as a number.
    */
    readonly languageIdCodec: ILanguageIdCodec;
    /**
    * An event emitted when basic language features are requested for the first time.
    * This event is emitted when embedded languages are encountered (e.g. JS code block inside Markdown)
    * or when a language is associated to a text model.
    *
    * **Note**: Basic language features refers to language configuration related features.
    * **Note**: This event is a superset of `onDidRequestRichLanguageFeatures`
    */
    readonly onDidRequestBasicLanguageFeatures: Event<string>;
    /**
    * An event emitted when rich language features are requested for the first time.
    * This event is emitted when a language is associated to a text model.
    *
    * **Note**: Rich language features refers to tokenizers, language features based on providers, etc.
    * **Note**: This event is a subset of `onDidRequestRichLanguageFeatures`
    */
    readonly onDidRequestRichLanguageFeatures: Event<string>;
    /**
    * An event emitted when languages have changed.
    */
    readonly onDidChange: Event<void>;
    /**
    * Register a language.
    */
    registerLanguage(def: ILanguageExtensionPoint): IDisposable;
    /**
    * Check if `languageId` is registered.
    */
    isRegisteredLanguageId(languageId: string): boolean;
    /**
    * Get a list of all registered languages.
    */
    getRegisteredLanguageIds(): string[];
    /**
    * Get a list of all registered languages with a name.
    * If a language is explicitly registered without a name, it will not be part of the result.
    * The result is sorted using by name case insensitive.
    */
    getSortedRegisteredLanguageNames(): ILanguageNameIdPair[];
    /**
    * Get the preferred language name for a language.
    */
    getLanguageName(languageId: string): string | null;
    /**
    * Get the mimetype for a language.
    */
    getMimeType(languageId: string): string | null;
    /**
    * Get the default icon for the language.
    */
    getIcon(languageId: string): ILanguageIcon | null;
    /**
    * Get all file extensions for a language.
    */
    getExtensions(languageId: string): ReadonlyArray<string>;
    /**
    * Get all file names for a language.
    */
    getFilenames(languageId: string): ReadonlyArray<string>;
    /**
    * Get all language configuration files for a language.
    */
    getConfigurationFiles(languageId: string): ReadonlyArray<URI>;
    /**
    * Look up a language by its name case insensitive.
    */
    getLanguageIdByLanguageName(languageName: string): string | null;
    /**
    * Look up a language by its mime type.
    */
    getLanguageIdByMimeType(mimeType: string | null | undefined): string | null;
    /**
    * Guess the language id for a resource.
    */
    guessLanguageIdByFilepathOrFirstLine(resource: URI, firstLine?: string): string | null;
    /**
    * Will fall back to 'plaintext' if `languageId` is unknown.
    */
    createById(languageId: string | null | undefined): ILanguageSelection;
    /**
    * Will fall back to 'plaintext' if `mimeType` is unknown.
    */
    createByMimeType(mimeType: string | null | undefined): ILanguageSelection;
    /**
    * Will fall back to 'plaintext' if the `languageId` cannot be determined.
    */
    createByFilepathOrFirstLine(resource: URI | null, firstLine?: string): ILanguageSelection;
    /**
    * Request basic language features for a language.
    */
    requestBasicLanguageFeatures(languageId: string): void;
    /**
    * Request rich language features for a language.
    */
    requestRichLanguageFeatures(languageId: string): void;
}