import { RangeEnum, ScaleBins, ScaleInterpolateEnum, ScaleInterpolateParams, SignalRef, TimeInterval, TimeIntervalStep } from 'vega';
import { Channel } from './channel';
import { DateTime } from './datetime';
import { ExprRef } from './expr';
import { ParameterExtent } from './selection';
import { Type } from './type';
export declare const ScaleType: {
    readonly LINEAR: "linear";
    readonly LOG: "log";
    readonly POW: "pow";
    readonly SQRT: "sqrt";
    readonly SYMLOG: "symlog";
    readonly IDENTITY: "identity";
    readonly SEQUENTIAL: "sequential";
    readonly TIME: "time";
    readonly UTC: "utc";
    readonly QUANTILE: "quantile";
    readonly QUANTIZE: "quantize";
    readonly THRESHOLD: "threshold";
    readonly BIN_ORDINAL: "bin-ordinal";
    readonly ORDINAL: "ordinal";
    readonly POINT: "point";
    readonly BAND: "band";
};
declare type ValueOf<T> = T[keyof T];
export declare type ScaleType = ValueOf<typeof ScaleType>;
/**
 * Index for scale categories -- only scale of the same categories can be merged together.
 * Current implementation is trying to be conservative and avoid merging scale type that might not work together
 */
export declare const SCALE_CATEGORY_INDEX: Record<ScaleType, ScaleType | 'numeric' | 'ordinal-position' | 'discretizing'>;
export declare const SCALE_TYPES: ScaleType[];
/**
 * Whether the two given scale types can be merged together.
 */
export declare function scaleCompatible(scaleType1: ScaleType, scaleType2: ScaleType): boolean;
/**
 * Return scale categories -- only scale of the same categories can be merged together.
 */
export declare function scaleTypePrecedence(scaleType: ScaleType): number;
export declare const QUANTITATIVE_SCALES: ReadonlySet<ScaleType>;
export declare const CONTINUOUS_TO_CONTINUOUS_SCALES: ReadonlySet<ScaleType>;
export declare function isQuantitative(type: ScaleType): type is 'linear' | 'log' | 'pow' | 'sqrt' | 'symlog';
export declare const CONTINUOUS_TO_DISCRETE_SCALES: ReadonlySet<ScaleType>;
export declare const CONTINUOUS_DOMAIN_SCALES: ReadonlySet<ScaleType>;
export declare const DISCRETE_DOMAIN_SCALES: ReadonlySet<ScaleType>;
export declare const TIME_SCALE_TYPES: ReadonlySet<ScaleType>;
export declare function hasDiscreteDomain(type: ScaleType): type is 'ordinal' | 'bin-ordinal' | 'point' | 'band';
export declare function hasContinuousDomain(type: ScaleType): type is 'linear' | 'log' | 'pow' | 'sqrt' | 'symlog' | 'time' | 'utc' | 'quantile' | 'quantize' | 'threshold';
export declare function isContinuousToContinuous(type: ScaleType): type is 'linear' | 'log' | 'pow' | 'sqrt' | 'symlog' | 'time' | 'utc';
export declare function isContinuousToDiscrete(type: ScaleType): type is 'quantile' | 'quantize' | 'threshold';
export interface ScaleConfig<ES extends ExprRef | SignalRef> {
    /**
     * If true, rounds numeric output values to integers.
     * This can be helpful for snapping to the pixel grid.
     * (Only available for `x`, `y`, and `size` scales.)
     */
    round?: boolean | ES;
    /**
     * If true, values that exceed the data domain are clamped to either the minimum or maximum range value
     */
    clamp?: boolean | ES;
    /**
     * Default inner padding for `x` and `y` band scales with nested `xOffset` and `yOffset` encoding.
     *
     * __Default value:__ `0.2`
     *
     * @minimum 0
     * @maximum 1
     */
    bandWithNestedOffsetPaddingInner?: number | ES;
    /**
     * Default outer padding for `x` and `y` band scales with nested `xOffset` and `yOffset` encoding.
     *
     * __Default value:__ `0.2`
     *
     * @minimum 0
     * @maximum 1
     */
    bandWithNestedOffsetPaddingOuter?: number | ES;
    /**
     * Default inner padding for `x` and `y` band scales.
     *
     * __Default value:__
     * - `nestedOffsetPaddingInner` for x/y scales with nested x/y offset scales.
     * - `barBandPaddingInner` for bar marks (`0.1` by default)
     * - `rectBandPaddingInner` for rect and other marks (`0` by default)
     *
     * @minimum 0
     * @maximum 1
     */
    bandPaddingInner?: number | ES;
    /**
     * Default outer padding for `x` and `y` band scales.
     *
     * __Default value:__ `paddingInner/2` (which makes _width/height = number of unique values * step_)
     *
     * @minimum 0
     * @maximum 1
     */
    bandPaddingOuter?: number | ES;
    /**
     * Default inner padding for `x` and `y` band-ordinal scales of `"bar"` marks.
     *
     * __Default value:__ `0.1`
     *
     * @minimum 0
     * @maximum 1
     */
    barBandPaddingInner?: number | ES;
    /**
     * Default inner padding for `x` and `y` band-ordinal scales of `"rect"` marks.
     *
     * __Default value:__ `0`
     *
     * @minimum 0
     * @maximum 1
     */
    rectBandPaddingInner?: number | ES;
    /**
     * Default padding inner for xOffset/yOffset's band scales.
     *
     * __Default Value:__ `0`
     */
    offsetBandPaddingInner?: number | ES;
    /**
     * Default padding outer for xOffset/yOffset's band scales.
     *
     * __Default Value:__ `0`
     */
    offsetBandPaddingOuter?: number | ES;
    /**
     * Default padding for continuous x/y scales.
     *
     * __Default:__ The bar width for continuous x-scale of a vertical bar and continuous y-scale of a horizontal bar.; `0` otherwise.
     *
     * @minimum 0
     */
    continuousPadding?: number | ES;
    /**
     * Default outer padding for `x` and `y` point-ordinal scales.
     *
     * __Default value:__ `0.5` (which makes _width/height = number of unique values * step_)
     *
     * @minimum 0
     * @maximum 1
     */
    pointPadding?: number | ES;
    /**
     * Use the source data range before aggregation as scale domain instead of aggregated data for aggregate axis.
     *
     * This is equivalent to setting `domain` to `"unaggregate"` for aggregated _quantitative_ fields by default.
     *
     * This property only works with aggregate functions that produce values within the raw data domain (`"mean"`, `"average"`, `"median"`, `"q1"`, `"q3"`, `"min"`, `"max"`). For other aggregations that produce values outside of the raw data domain (e.g. `"count"`, `"sum"`), this property is ignored.
     *
     * __Default value:__ `false`
     */
    useUnaggregatedDomain?: boolean;
    /**
     * The default max value for mapping quantitative fields to bar's size/bandSize.
     *
     * If undefined (default), we will use the axis's size (width or height) - 1.
     * @minimum 0
     */
    maxBandSize?: number;
    /**
     * The default min value for mapping quantitative fields to bar and tick's size/bandSize scale with zero=false.
     *
     * __Default value:__ `2`
     *
     * @minimum 0
     */
    minBandSize?: number;
    /**
     * The default max value for mapping quantitative fields to text's size/fontSize.
     *
     * __Default value:__ `40`
     *
     * @minimum 0
     */
    maxFontSize?: number;
    /**
     * The default min value for mapping quantitative fields to tick's size/fontSize scale with zero=false
     *
     * __Default value:__ `8`
     *
     * @minimum 0
     */
    minFontSize?: number;
    /**
     * Default minimum opacity for mapping a field to opacity.
     *
     * __Default value:__ `0.3`
     *
     * @minimum 0
     * @maximum 1
     */
    minOpacity?: number;
    /**
     * Default max opacity for mapping a field to opacity.
     *
     * __Default value:__ `0.8`
     *
     * @minimum 0
     * @maximum 1
     */
    maxOpacity?: number;
    /**
     * Default minimum value for point size scale with zero=false.
     *
     * __Default value:__ `9`
     *
     * @minimum 0
     */
    minSize?: number;
    /**
     * Default max value for point size scale.
     * @minimum 0
     */
    maxSize?: number;
    /**
     * Default minimum strokeWidth for the scale of strokeWidth for rule and line marks and of size for trail marks with zero=false.
     *
     * __Default value:__ `1`
     *
     * @minimum 0
     */
    minStrokeWidth?: number;
    /**
     * Default max strokeWidth for the scale of strokeWidth for rule and line marks and of size for trail marks.
     *
     * __Default value:__ `4`
     *
     * @minimum 0
     */
    maxStrokeWidth?: number;
    /**
     * Default range cardinality for [`quantile`](https://vega.github.io/vega-lite/docs/scale.html#quantile) scale.
     *
     * __Default value:__ `4`
     *
     * @minimum 0
     */
    quantileCount?: number;
    /**
     * Default range cardinality for [`quantize`](https://vega.github.io/vega-lite/docs/scale.html#quantize) scale.
     *
     * __Default value:__ `4`
     *
     * @minimum 0
     */
    quantizeCount?: number;
    /**
     * Reverse x-scale by default (useful for right-to-left charts).
     */
    xReverse?: boolean | ES;
    /**
     * Default for ensuring that a zero baseline values for [`quantize`](https://vega.github.io/vega-lite/docs/scale.html#quantize) scale.
     *
     *
     * __Default value:__ `true`
     *
     */
    zero?: boolean;
}
export declare const defaultScaleConfig: ScaleConfig<SignalRef>;
export interface SchemeParams {
    /**
     * A color scheme name for ordinal scales (e.g., `"category10"` or `"blues"`).
     *
     * For the full list of supported schemes, please refer to the [Vega Scheme](https://vega.github.io/vega/docs/schemes/#reference) reference.
     */
    name: string | SignalRef;
    /**
     * The extent of the color range to use. For example `[0.2, 1]` will rescale the color scheme such that color values in the range _[0, 0.2)_ are excluded from the scheme.
     */
    extent?: (number | SignalRef)[] | SignalRef;
    /**
     * The number of colors to use in the scheme. This can be useful for scale types such as `"quantize"`, which use the length of the scale range to determine the number of discrete bins for the scale domain.
     */
    count?: number | SignalRef;
}
export declare type Domain = (null | string | number | boolean | DateTime | SignalRef)[] | 'unaggregated' | ParameterExtent | SignalRef | DomainUnionWith;
export declare type Scheme = string | SchemeParams;
export declare function isExtendedScheme(scheme: Scheme | SignalRef): scheme is SchemeParams;
export declare function isParameterDomain(domain: Domain): domain is ParameterExtent;
export interface DomainUnionWith {
    /**
     * Customized domain values to be union with the field's values or explicitly defined domain.
     * Should be an array of valid scale domain values.
     */
    unionWith: number[] | string[] | boolean[] | DateTime[];
}
export declare function isDomainUnionWith(domain: Domain): domain is DomainUnionWith;
export interface FieldRange {
    field: string;
}
export declare function isFieldRange(range: any): range is FieldRange;
export interface Scale<ES extends ExprRef | SignalRef = ExprRef | SignalRef> {
    /**
     * The type of scale. Vega-Lite supports the following categories of scale types:
     *
     * 1) [**Continuous Scales**](https://vega.github.io/vega-lite/docs/scale.html#continuous) -- mapping continuous domains to continuous output ranges ([`"linear"`](https://vega.github.io/vega-lite/docs/scale.html#linear), [`"pow"`](https://vega.github.io/vega-lite/docs/scale.html#pow), [`"sqrt"`](https://vega.github.io/vega-lite/docs/scale.html#sqrt), [`"symlog"`](https://vega.github.io/vega-lite/docs/scale.html#symlog), [`"log"`](https://vega.github.io/vega-lite/docs/scale.html#log), [`"time"`](https://vega.github.io/vega-lite/docs/scale.html#time), [`"utc"`](https://vega.github.io/vega-lite/docs/scale.html#utc).
     *
     * 2) [**Discrete Scales**](https://vega.github.io/vega-lite/docs/scale.html#discrete) -- mapping discrete domains to discrete ([`"ordinal"`](https://vega.github.io/vega-lite/docs/scale.html#ordinal)) or continuous ([`"band"`](https://vega.github.io/vega-lite/docs/scale.html#band) and [`"point"`](https://vega.github.io/vega-lite/docs/scale.html#point)) output ranges.
     *
     * 3) [**Discretizing Scales**](https://vega.github.io/vega-lite/docs/scale.html#discretizing) -- mapping continuous domains to discrete output ranges [`"bin-ordinal"`](https://vega.github.io/vega-lite/docs/scale.html#bin-ordinal), [`"quantile"`](https://vega.github.io/vega-lite/docs/scale.html#quantile), [`"quantize"`](https://vega.github.io/vega-lite/docs/scale.html#quantize) and [`"threshold"`](https://vega.github.io/vega-lite/docs/scale.html#threshold).
     *
     * __Default value:__ please see the [scale type table](https://vega.github.io/vega-lite/docs/scale.html#type).
     */
    type?: ScaleType;
    /**
     * Customized domain values in the form of constant values or dynamic values driven by a parameter.
     *
     * 1) Constant `domain` for _quantitative_ fields can take one of the following forms:
     *
     * - A two-element array with minimum and maximum values. To create a diverging scale, this two-element array can be combined with the `domainMid` property.
     * - An array with more than two entries, for [Piecewise quantitative scales](https://vega.github.io/vega-lite/docs/scale.html#piecewise).
     * - A string value `"unaggregated"`, if the input field is aggregated, to indicate that the domain should include the raw data values prior to the aggregation.
     *
     * 2) Constant `domain` for _temporal_ fields can be a two-element array with minimum and maximum values, in the form of either timestamps or the [DateTime definition objects](https://vega.github.io/vega-lite/docs/types.html#datetime).
     *
     * 3) Constant `domain` for _ordinal_ and _nominal_ fields can be an array that lists valid input values.
     *
     * 4) To combine (union) specified constant domain with the field's values, `domain` can be an object with a `unionWith` property that specify constant domain to be combined. For example, `domain: {unionWith: [0, 100]}` for a quantitative scale means that the scale domain always includes `[0, 100]`, but will include other values in the fields beyond `[0, 100]`.
     *
     * 5) Domain can also takes an object defining a field or encoding of a parameter that [interactively determines](https://vega.github.io/vega-lite/docs/selection.html#scale-domains) the scale domain.
     */
    domain?: (null | string | number | boolean | DateTime | ES)[] | 'unaggregated' | ParameterExtent | DomainUnionWith | ES;
    /**
     * Inserts a single mid-point value into a two-element domain. The mid-point value must lie between the domain minimum and maximum values. This property can be useful for setting a midpoint for [diverging color scales](https://vega.github.io/vega-lite/docs/scale.html#piecewise). The domainMid property is only intended for use with scales supporting continuous, piecewise domains.
     */
    domainMid?: number | ES;
    /**
     * Sets the maximum value in the scale domain, overriding the `domain` property. This property is only intended for use with scales having continuous domains.
     */
    domainMax?: number | DateTime | ES;
    /**
     * Sets the minimum value in the scale domain, overriding the domain property. This property is only intended for use with scales having continuous domains.
     */
    domainMin?: number | DateTime | ES;
    /**
     * If true, reverses the order of the scale range.
     * __Default value:__ `false`.
     */
    reverse?: boolean | ES;
    /**
     * The range of the scale. One of:
     *
     * - A string indicating a [pre-defined named scale range](https://vega.github.io/vega-lite/docs/scale.html#range-config) (e.g., example, `"symbol"`, or `"diverging"`).
     *
     * - For [continuous scales](https://vega.github.io/vega-lite/docs/scale.html#continuous), two-element array indicating  minimum and maximum values, or an array with more than two entries for specifying a [piecewise scale](https://vega.github.io/vega-lite/docs/scale.html#piecewise).
     *
     * - For [discrete](https://vega.github.io/vega-lite/docs/scale.html#discrete) and [discretizing](https://vega.github.io/vega-lite/docs/scale.html#discretizing) scales, an array of desired output values or an object with a `field` property representing the range values.  For example, if a field `color` contains CSS color names, we can set `range` to `{field: "color"}`.
     *
     * __Notes:__
     *
     * 1) For color scales you can also specify a color [`scheme`](https://vega.github.io/vega-lite/docs/scale.html#scheme) instead of `range`.
     *
     * 2) Any directly specified `range` for `x` and `y` channels will be ignored. Range can be customized via the view's corresponding [size](https://vega.github.io/vega-lite/docs/size.html) (`width` and `height`).
     */
    range?: RangeEnum | (number | string | number[] | ES)[] | FieldRange;
    /**
     * Sets the maximum value in the scale range, overriding the `range` property or the default range. This property is only intended for use with scales having continuous ranges.
     */
    rangeMax?: number | string | ES;
    /**
     * Sets the minimum value in the scale range, overriding the `range` property or the default range. This property is only intended for use with scales having continuous ranges.
     */
    rangeMin?: number | string | ES;
    /**
     * A string indicating a color [scheme](https://vega.github.io/vega-lite/docs/scale.html#scheme) name (e.g., `"category10"` or `"blues"`) or a [scheme parameter object](https://vega.github.io/vega-lite/docs/scale.html#scheme-params).
     *
     * Discrete color schemes may be used with [discrete](https://vega.github.io/vega-lite/docs/scale.html#discrete) or [discretizing](https://vega.github.io/vega-lite/docs/scale.html#discretizing) scales. Continuous color schemes are intended for use with color scales.
     *
     * For the full list of supported schemes, please refer to the [Vega Scheme](https://vega.github.io/vega/docs/schemes/#reference) reference.
     */
    scheme?: string | SchemeParams | ES;
    /**
     * The alignment of the steps within the scale range.
     *
     * This value must lie in the range `[0,1]`. A value of `0.5` indicates that the steps should be centered within the range. A value of `0` or `1` may be used to shift the bands to one side, say to position them adjacent to an axis.
     *
     * __Default value:__ `0.5`
     */
    align?: number | ES;
    /**
     * Bin boundaries can be provided to scales as either an explicit array of bin boundaries or as a bin specification object. The legal values are:
     * - An [array](../types/#Array) literal of bin boundary values. For example, `[0, 5, 10, 15, 20]`. The array must include both starting and ending boundaries. The previous example uses five values to indicate a total of four bin intervals: [0-5), [5-10), [10-15), [15-20]. Array literals may include signal references as elements.
     * - A [bin specification object](https://vega.github.io/vega-lite/docs/scale.html#bins) that indicates the bin _step_ size, and optionally the _start_ and _stop_ boundaries.
     * - An array of bin boundaries over the scale domain. If provided, axes and legends will use the bin boundaries to inform the choice of tick marks and text labels.
     */
    bins?: ScaleBins;
    /**
     * If `true`, rounds numeric output values to integers. This can be helpful for snapping to the pixel grid.
     *
     * __Default value:__ `false`.
     */
    round?: boolean | ES;
    /**
     * For _[continuous](https://vega.github.io/vega-lite/docs/scale.html#continuous)_ scales, expands the scale domain to accommodate the specified number of pixels on each of the scale range. The scale range must represent pixels for this parameter to function as intended. Padding adjustment is performed prior to all other adjustments, including the effects of the `zero`, `nice`, `domainMin`, and `domainMax` properties.
     *
     * For _[band](https://vega.github.io/vega-lite/docs/scale.html#band)_ scales, shortcut for setting `paddingInner` and `paddingOuter` to the same value.
     *
     * For _[point](https://vega.github.io/vega-lite/docs/scale.html#point)_ scales, alias for `paddingOuter`.
     *
     * __Default value:__ For _continuous_ scales, derived from the [scale config](https://vega.github.io/vega-lite/docs/scale.html#config)'s `continuousPadding`.
     * For _band and point_ scales, see `paddingInner` and `paddingOuter`. By default, Vega-Lite sets padding such that _width/height = number of unique values * step_.
     *
     * @minimum 0
     */
    padding?: number | ES;
    /**
     * The inner padding (spacing) within each band step of band scales, as a fraction of the step size. This value must lie in the range [0,1].
     *
     * For point scale, this property is invalid as point scales do not have internal band widths (only step sizes between bands).
     *
     * __Default value:__ derived from the [scale config](https://vega.github.io/vega-lite/docs/scale.html#config)'s `bandPaddingInner`.
     *
     * @minimum 0
     * @maximum 1
     */
    paddingInner?: number | ES;
    /**
     * The outer padding (spacing) at the ends of the range of band and point scales,
     * as a fraction of the step size. This value must lie in the range [0,1].
     *
     * __Default value:__ derived from the [scale config](https://vega.github.io/vega-lite/docs/scale.html#config)'s `bandPaddingOuter` for band scales and `pointPadding` for point scales.
     * By default, Vega-Lite sets outer padding such that _width/height = number of unique values * step_.
     *
     * @minimum 0
     * @maximum 1
     */
    paddingOuter?: number | ES;
    /**
     * If `true`, values that exceed the data domain are clamped to either the minimum or maximum range value
     *
     * __Default value:__ derived from the [scale config](https://vega.github.io/vega-lite/docs/config.html#scale-config)'s `clamp` (`true` by default).
     */
    clamp?: boolean | ES;
    /**
     * Extending the domain so that it starts and ends on nice round values. This method typically modifies the scale’s domain, and may only extend the bounds to the nearest round value. Nicing is useful if the domain is computed from data and may be irregular. For example, for a domain of _[0.201479…, 0.996679…]_, a nice domain might be _[0.2, 1.0]_.
     *
     * For quantitative scales such as linear, `nice` can be either a boolean flag or a number. If `nice` is a number, it will represent a desired tick count. This allows greater control over the step size used to extend the bounds, guaranteeing that the returned ticks will exactly cover the domain.
     *
     * For temporal fields with time and utc scales, the `nice` value can be a string indicating the desired time interval. Legal values are `"millisecond"`, `"second"`, `"minute"`, `"hour"`, `"day"`, `"week"`, `"month"`, and `"year"`. Alternatively, `time` and `utc` scales can accept an object-valued interval specifier of the form `{"interval": "month", "step": 3}`, which includes a desired number of interval steps. Here, the domain would snap to quarter (Jan, Apr, Jul, Oct) boundaries.
     *
     * __Default value:__ `true` for unbinned _quantitative_ fields without explicit domain bounds; `false` otherwise.
     *
     */
    nice?: boolean | number | TimeInterval | TimeIntervalStep | ES;
    /**
     * The logarithm base of the `log` scale (default `10`).
     */
    base?: number | ES;
    /**
     * The exponent of the `pow` scale.
     */
    exponent?: number | ES;
    /**
     * A constant determining the slope of the symlog function around zero. Only used for `symlog` scales.
     *
     * __Default value:__ `1`
     */
    constant?: number | ES;
    /**
     * If `true`, ensures that a zero baseline value is included in the scale domain.
     *
     * __Default value:__ `true` for x and y channels if the quantitative field is not binned and no custom `domain` is provided; `false` otherwise.
     *
     * __Note:__ Log, time, and utc scales do not support `zero`.
     */
    zero?: boolean | ES;
    /**
     * The interpolation method for range values. By default, a general interpolator for numbers, dates, strings and colors (in HCL space) is used. For color ranges, this property allows interpolation in alternative color spaces. Legal values include `rgb`, `hsl`, `hsl-long`, `lab`, `hcl`, `hcl-long`, `cubehelix` and `cubehelix-long` ('-long' variants use longer paths in polar coordinate spaces). If object-valued, this property accepts an object with a string-valued _type_ property and an optional numeric _gamma_ property applicable to rgb and cubehelix interpolators. For more, see the [d3-interpolate documentation](https://github.com/d3/d3-interpolate).
     *
     * * __Default value:__ `hcl`
     */
    interpolate?: ScaleInterpolateEnum | ES | ScaleInterpolateParams;
}
export declare const SCALE_PROPERTIES: (keyof Scale<any>)[];
export declare const NON_TYPE_DOMAIN_RANGE_VEGA_SCALE_PROPERTIES: ("reverse" | "padding" | "round" | "base" | "zero" | "interpolate" | "align" | "domainMin" | "domainMax" | "domainMid" | "nice" | "bins" | "clamp" | "constant" | "exponent" | "paddingInner" | "paddingOuter")[];
export declare function scaleTypeSupportProperty(scaleType: ScaleType, propName: keyof Scale): boolean;
/**
 * Returns undefined if the input channel supports the input scale property name
 */
export declare function channelScalePropertyIncompatability(channel: Channel, propName: keyof Scale): string;
export declare function scaleTypeSupportDataType(specifiedType: ScaleType, fieldDefType: Type): boolean;
export declare function channelSupportScaleType(channel: Channel, scaleType: ScaleType, hasNestedOffsetScale?: boolean): boolean;
export {};
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