import * as AST from "../types/ast";
declare type ReduceValue = {
    value: number;
    type: AST.NumberValue["type"];
} | {
    value: number;
    unit: AST.LengthUnit;
    type: AST.LengthValue["type"];
} | {
    value: number;
    unit: AST.AngleUnit;
    type: AST.AngleValue["type"];
} | {
    value: number;
    unit: AST.TimeUnit;
    type: AST.TimeValue["type"];
} | {
    value: number;
    unit: AST.FrequencyUnit;
    type: AST.FrequencyValue["type"];
} | {
    value: number;
    unit: AST.ResolutionUnit;
    type: AST.ResolutionValue["type"];
} | {
    value: number;
    unit: "%";
    type: AST.PercentageValue["type"];
} | {
    value: number;
    unit: AST.FlexUnit;
    type: AST.FlexValue["type"];
};
export declare function reduce(expr: AST.Node): ReduceValue | null;
export {};