/**
 * @license
 * Copyright 2020 Google LLC
 * SPDX-License-Identifier: BSD-3-Clause
 */
import ts from 'typescript';
import { ProgramMessage, Placeholder } from './messages.js';
type ResultOrError<R, E> = {
    result: R;
    error?: undefined;
} | {
    result?: undefined;
    error: E;
};
/**
 * Extract translation messages from all files in a TypeScript program.
 */
export declare function extractMessagesFromProgram(program: ts.Program): {
    messages: ProgramMessage[];
    errors: ts.Diagnostic[];
};
/**
 * Analyze the options argument to a msg call.
 */
export declare function extractOptions(node: ts.Node | undefined, file: ts.SourceFile): ResultOrError<{
    id?: string;
    desc?: string;
}, ts.Diagnostic>;
interface ExtractedTemplate {
    contents: Array<string | Placeholder>;
    params?: string[];
    tag: 'html' | 'str' | undefined;
    template: ts.TemplateLiteral | ts.StringLiteral;
}
/**
 * Analyze the template argument to a msg call.
 */
export declare function extractTemplate(templateArg: ts.Node, file: ts.SourceFile, typeChecker: ts.TypeChecker): ResultOrError<ExtractedTemplate, ts.DiagnosticWithLocation>;
export declare function generateMsgIdFromAstNode(template: ts.TemplateLiteral | ts.StringLiteral, isHtmlTagged: boolean): string;
/**
 * E.g. "foo", 'foo', or `foo`, but not `foo${bar}`.
 */
export declare function isStaticString(node: ts.Node): node is ts.StringLiteral | ts.NoSubstitutionTemplateLiteral;
/**
 * E.g. html`foo` or html`foo${bar}`
 */
export declare function isLitTemplate(node: ts.Node): node is ts.TaggedTemplateExpression;
/**
 * E.g. str`foo${bar}`
 */
export declare function isStrTemplate(node: ts.Node): node is ts.TaggedTemplateExpression;
/**
 * Return whether this is a call to the lit-localize `msg` function.
 */
export declare function isMsgCall(node: ts.Node, typeChecker: ts.TypeChecker): node is ts.CallExpression;
/**
 * Return whether a node is a string tagged with our special `str` tag.
 */
export declare function isStrTaggedTemplate(node: ts.Node, typeChecker: ts.TypeChecker): node is ts.TaggedTemplateExpression;
export {};