/**
 * MathML.ts - Utilities for MathML formatting.
 * ============================================
 *
 * This file is part of
 * [MathJSLab package](https://www.npmjs.com/package/mathjslab)
 * ([repository](https://github.com/MathJSLab/mathjslab)) -
 * [MIT License](https://opensource.org/license/mit).
 *
 * Copyright © 2016-2026 [Sergio Lindau](mailto:sergiolindau@gmail.com)
 *
 * homepage: [mathjslab.com](https://mathjslab.com/)
 *
 * [ISBN 978-65-00-82338-7](https://grp.isbn-international.org/search/piid_solr?keys=978-65-00-82338-7)
 */
/**
 * Generic MathML formatting function.
 */
type FormatFunctionGeneric<T extends (string | string[])[] = (string | string[])[]> = (...args: T) => string;
/**
 * Generic type for FormatRegistry.
 */
type FormatRegistryGeneric<T = any> = {
    [K in keyof T]: T[K];
};
/**
 * Format registry function signatures.
 */
interface FormatRegistry<T extends string = string> {
    '+': (left: T, right: T) => string;
    '-': (left: T, right: T) => string;
    '.*': (left: T, right: T) => string;
    './': (left: T, right: T) => string;
    '.\\': (left: T, right: T) => string;
    '\\': (left: T, right: T) => string;
    '.^': (left: T, right: T) => string;
    '.**': (left: T, right: T) => string;
    '<': (left: T, right: T) => string;
    '<=': (left: T, right: T) => string;
    '>': (left: T, right: T) => string;
    '>=': (left: T, right: T) => string;
    '==': (left: T, right: T) => string;
    '!=': (left: T, right: T) => string;
    '~=': (left: T, right: T) => string;
    '&': (left: T, right: T) => string;
    '|': (left: T, right: T) => string;
    '&&': (left: T, right: T) => string;
    '||': (left: T, right: T) => string;
    '=': (left: T, right: T) => string;
    '+=': (left: T, right: T) => string;
    '-=': (left: T, right: T) => string;
    '*=': (left: T, right: T) => string;
    '/=': (left: T, right: T) => string;
    '\\=': (left: T, right: T) => string;
    '^=': (left: T, right: T) => string;
    '**=': (left: T, right: T) => string;
    '.*=': (left: T, right: T) => string;
    './=': (left: T, right: T) => string;
    '.\\=': (left: T, right: T) => string;
    '.^=': (left: T, right: T) => string;
    '.**=': (left: T, right: T) => string;
    '&=': (left: T, right: T) => string;
    '|=': (left: T, right: T) => string;
    '*': (left: T, right: T) => string;
    '+_': (right: T) => string;
    '-_': (right: T) => string;
    '++_': (right: T) => string;
    '--_': (right: T) => string;
    '_++': (left: T) => string;
    '_--': (left: T) => string;
    '!': (right: T) => string;
    '~': (right: T) => string;
    '/': (left: T, right: T) => string;
    '^': (left: T, right: T) => string;
    '**': (left: T, right: T) => string;
    ".'": (left: T) => string;
    "'": (left: T) => string;
    '()': (left: T, inner: T, right: T) => string;
    IDENT: (id: T) => string;
    FCNDEF: (id: T) => string;
    '.': (name: T, fields: T[]) => string;
    LIST: (list: T[]) => string;
    RANGE: (...args: T[]) => string;
    ENDRANGE: () => string;
    ':': () => string;
    '<~>': () => string;
    IDX: (expr: T, left: T, list: T[], right: T) => string;
    RETLIST: () => string;
    CMDWLIST: (cmd: T, list: T[]) => string;
    INVALID: () => string;
    UNDEFINED: () => string;
    ERROR: () => string;
    math: (inner: T, display: T) => string;
    errorReplace: (expr: T) => string;
    abs: (...args: T[]) => string;
    conj: (...args: T[]) => string;
    sqrt: (...args: T[]) => string;
    root: (...args: T[]) => string;
    exp: (...args: T[]) => string;
    logb: (...args: T[]) => string;
    log2: (...args: T[]) => string;
    log10: (...args: T[]) => string;
    gamma: (...args: T[]) => string;
    factorial: (...args: T[]) => string;
}
/**
 * Format registry function names (keys).
 */
type KeyOfFormatRegistry<T extends string = string> = keyof FormatRegistry<T>;
/**
 * Union of all function signatures and generic MathML formatting function signature.
 */
type FormatFunctionUnion<T extends string = string> = FormatRegistry<T>[KeyOfFormatRegistry<T>] | FormatFunctionGeneric<(T | T[])[]>;
/**
 * Union of format functions registry and generic format functions registry.
 */
type FormatRegistryUnion<T extends string = string, K = any> = FormatRegistry<T> & FormatRegistryGeneric<K>;
/**
 * Keys of union of format functions registry and generic format functions registry.
 */
type KeyOfFormatRegistryUnion<T extends string = string, K = any> = keyof FormatRegistryUnion<T, K>;
/**
 * # `MathML` - Utilities for MathML formatting.
 *
 * This is an `abstract class` with only one `static` property: `format`.
 *
 * The `MathML.format` object is a record where the keys represent operations,
 * functions or simply nodes of the abstract syntax tree (AST). The values ​​are
 * MathML formatting functions where the arguments are of type `string` or
 * `string[]` and the return is of type `string`. The functions insert the
 * arguments into structures formatted in MathML language.
 *
 * The way the types were defined allows you to specify the signature of the
 * functions and at the same time allows a generic reference to a formatting
 * function to be used, such as `Math.format['key-name' as any]`.
 *
 * The `MathML` class is an abstract class that was not designed to be
 * instantiated or inherited, but extensions with dynamic properties and
 * methods can be created. The types needed for this are exported by the
 * `MathML` module.
 *
 * This file is part of
 * [MathJSLab package](https://www.npmjs.com/package/mathjslab)
 * ([repository](https://github.com/MathJSLab/mathjslab)) -
 * [MIT License](https://opensource.org/license/mit).
 *
 * Copyright © 2016-2026 [Sergio Lindau](mailto:sergiolindau@gmail.com)
 *
 * homepage: [mathjslab.com](https://mathjslab.com/)
 *
 * [ISBN 978-65-00-82338-7](https://grp.isbn-international.org/search/piid_solr?keys=978-65-00-82338-7)
 *
 * ### References
 *
 * Here are some references used to create this code:
 *
 * - [W3C Math Home](https://www.w3.org/Math/)
 *     - [Mathematical Markup Language (MathML) (Latest MathML Recommendation)](https://www.w3.org/TR/MathML/)
 *     - [Mathematical Markup Language (MathML) Version 4.0 (Working Draft)](https://www.w3.org/TR/mathml4/) - [Editor's Draft](https://w3c.github.io/mathml/)
 *     - [MathML Core (Working Draft)](https://www.w3.org/TR/mathml-core/) - [Editor's Draft](https://w3c.github.io/mathml-core/)
 *     - [Mathematical Markup Language (MathML) Version 3.0 2nd Edition](https://www.w3.org/TR/MathML3/)
 *     - [Mathematical Markup Language (MathML) Version 2.0 (Second Edition) - Latest MathML 2 version (Superseded Recommendation)](https://www.w3.org/TR/MathML2/)
 *     - [The MathML Document Object Model](https://www.w3.org/Math/DOM/)
 *     - [Notes on MathML (Group Draft Note)](https://w3c.github.io/mathml-docs/notes-on-mathml/)
 * - [MDN Web Docs - MathML](https://developer.mozilla.org/en-US/docs/Web/MathML)
 *     - [MathML element reference](https://developer.mozilla.org/en-US/docs/Web/MathML/Element)
 *     - [Attributes](https://developer.mozilla.org/en-US/docs/Web/MathML/Attribute)
 *     - [Global attributes](https://developer.mozilla.org/en-US/docs/Web/MathML/Global_attributes)
 * - [Wolfram Research, Inc. - MathML Central](https://www.mathmlcentral.com/)
 *     - [Online MathML conversion tool](https://www.mathmlcentral.com/Tools/ToMathML.jsp)
 * - [Wikipedia - MathML](https://en.wikipedia.org/wiki/MathML)
 * - [m@th IT - Brief Tutorial on MathML](https://www.math-it.org/Publikationen/MathML.html)
 * - [iMathEQ - Online Mathematics Formula Editor](https://www.imatheq.com/)
 * - [MathJax - Beautiful and accessible math in all browsers](https://www.mathjax.org/)
 *
 */
declare abstract class MathML {
    /**
     * AST nodes, built-in functions and other MathML formatting functions.
     * The keys of `format` object is the AST node `type` property (symbols
     * and uppercase characters), or the name of a built-in function
     * (lowercase characters).
     */
    static readonly format: FormatRegistryUnion;
}
/**
 * Exports.
 */
export type { FormatFunctionUnion as FormatFunction, FormatRegistryUnion as FormatRegistry, KeyOfFormatRegistryUnion as KeyOfFormatRegistry };
declare const format: FormatRegistryUnion<string, any>;
export { format, MathML };
/**
 * Default export.
 */
declare const _default: {
    format: FormatRegistryUnion<string, any>;
    MathML: typeof MathML;
};
export default _default;