import * as postcss from 'postcss';
import { NodeProps } from '../node';
import { RawWithValue } from '../raw-with-value';
import type * as sassInternal from '../sass-internal';
import { Expression } from '.';
/**
 * The initializer properties for {@link NumberExpression}.
 *
 * @category Expression
 */
export interface NumberExpressionProps extends NodeProps {
    value: number;
    unit?: string;
    raws?: NumberExpressionRaws;
}
/**
 * Raws indicating how to precisely serialize a {@link NumberExpression}.
 *
 * @category Expression
 */
export interface NumberExpressionRaws {
    /**
     * The raw string representation of the number.
     *
     * Numbers can be represented with or without leading and trailing zeroes, and
     * use scientific notation. For example, the following number representations
     * have the same value: `1e3`, `1000`, `01000.0`.
     */
    value?: RawWithValue<number>;
}
/**
 * An expression representing a number literal in Sass.
 *
 * @category Expression
 */
export declare class NumberExpression extends Expression {
    readonly sassType: "number";
    raws: NumberExpressionRaws;
    /** The numeric value of this expression. */
    get value(): number;
    set value(value: number);
    private _value;
    /** The denominator units of this number. */
    get unit(): string | null;
    set unit(unit: string | null);
    private _unit;
    /** Whether the number is unitless. */
    isUnitless(): boolean;
    constructor(defaults: NumberExpressionProps);
    /** @hidden */
    constructor(_: undefined, inner: sassInternal.NumberExpression);
    clone(overrides?: Partial<NumberExpressionProps>): this;
    toJSON(): object;
    /** @hidden */
    toJSON(_: string, inputs: Map<postcss.Input, number>): object;
    /** @hidden */
    toString(): string;
    /** @hidden */
    get nonStatementChildren(): ReadonlyArray<never>;
}