export type ExprCode = number | string;
export type ExprNodeType = "apply" | "block" | "assign" | "if" | "negate" | "return" | "statements" | "var" | "+" | "-" | "*" | "/" | "==" | "!=" | "<" | "<=" | ">" | ">=" | "&&" | "||" | "!" | "~" | "^" | "%" | "?";
export type ExprAtom = string | ManifestNumber;
export type ExprCell = [ExprNodeType, ExprNode[]];
export type ExprNode = ExprAtom | ExprCell;
export type ManifestNumberType = "intAbstract" | "floatAbstract";
export declare class ManifestNumber {
    type: ManifestNumberType;
    value: number;
    constructor(type: ManifestNumberType, value: number);
}
export type ParsedExpr = ExprNode;
export type EvalEnv = {
    [name: string]: number | string;
};
export declare function parseCode(code: ExprCode): ExprNode;
export declare function substitute(ast: ExprNode, match: (node: ExprNode) => boolean, replace: (node: ExprNode) => ExprNode): ExprNode;
export declare function substituteIdentifiers(ast: ExprNode, subs: {
    [name: string]: ExprNode;
}): ExprNode;
export declare function exprNodeToString(ast: ExprNode): string;
export declare function exprNodeToWebGLShader(ast: ExprNode): string;
export declare function exprCodeToWebGLShader(code: ExprCode, identifierSubs?: {
    [ident: string]: ExprNode;
}): string;
export type CompiledExpr = (env: {
    [name: string]: any;
}) => number;
export declare function compileCode(code: ExprCode): CompiledExpr;
export declare function evalCode(input: ExprCode, env: {
    [name: string]: any;
}): number;