@honua/sdk-js
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    Variable exprConst

    expr: {
        abs: (input: NumberInput) => Expr<number>;
        accumulated: () => Expr<ExprValue>;
        acos: (input: NumberInput) => Expr<number>;
        add: (...inputs: NumberInput[]) => Expr<number>;
        all: (...inputs: BooleanInput[]) => Expr<boolean>;
        any: (...inputs: BooleanInput[]) => Expr<boolean>;
        asin: (input: NumberInput) => Expr<number>;
        at: (index: NumberInput, array: Expr<unknown>) => Expr<ExprValue>;
        atan: (input: NumberInput) => Expr<number>;
        case: (
            ...args: (Resolvable | [BooleanInput, Resolvable])[],
        ) => Expr<ExprValue>;
        ceil: (input: NumberInput) => Expr<number>;
        coalesce: (...inputs: Resolvable[]) => Expr<ExprValue>;
        collator: (options?: CollatorOptions) => Expr<ExprCollator>;
        concat: (...inputs: Resolvable[]) => Expr<string>;
        contains: (needle: Resolvable, haystack: Resolvable) => Expr<boolean>;
        cos: (input: NumberInput) => Expr<number>;
        cubicBezier: (
            x1: number,
            y1: number,
            x2: number,
            y2: number,
        ) => InterpolationMethod;
        distance: (geometry: Expr<ExprValue> | GeoJsonGeometry) => Expr<number>;
        distanceFromCenter: () => Expr<number>;
        divide: (a: NumberInput, b: NumberInput) => Expr<number>;
        downcase: (input: StringInput) => Expr<string>;
        e: () => Expr<number>;
        eq: (left: Resolvable, right: Resolvable) => Expr<boolean>;
        exponential: (base: number) => InterpolationMethod;
        featureState: (property: string) => Expr<ExprValue>;
        floor: (input: NumberInput) => Expr<number>;
        format: (
            ...segments: [StringInput, FormatSegmentOptions?][],
        ) => Expr<ExprFormatted>;
        geometryType: () => Expr<string>;
        get: (property: string, object?: Expr<unknown>) => Expr<ExprValue>;
        gt: (left: Resolvable, right: Resolvable) => Expr<boolean>;
        gte: (left: Resolvable, right: Resolvable) => Expr<boolean>;
        has: (property: string, object?: Expr<unknown>) => Expr<boolean>;
        heatmapDensity: () => Expr<number>;
        hsl: (
            hue: NumberInput,
            saturation: NumberInput,
            lightness: NumberInput,
        ) => Expr<ExprColor>;
        hsla: (
            hue: NumberInput,
            saturation: NumberInput,
            lightness: NumberInput,
            alpha: NumberInput,
        ) => Expr<ExprColor>;
        id: () => Expr<ExprValue>;
        image: (name: StringInput) => Expr<ExprImage>;
        indexOf: (
            needle: Resolvable,
            haystack: Resolvable,
            fromIndex?: NumberInput,
        ) => Expr<number>;
        interpolate: (
            method: InterpolationMethod,
            input: Resolvable,
            ...stops: [number, Resolvable][],
        ) => Expr<ExprValue>;
        interpolateHcl: (
            method: InterpolationMethod,
            input: Resolvable,
            ...stops: [number, ColorInput][],
        ) => Expr<ExprColor>;
        interpolateLab: (
            method: InterpolationMethod,
            input: Resolvable,
            ...stops: [number, ColorInput][],
        ) => Expr<ExprColor>;
        intersects: (geometry: Expr<ExprValue> | GeoJsonGeometry) => Expr<boolean>;
        length: (input: Resolvable) => Expr<number>;
        let: (
            bindings: Record<string, Resolvable>,
            result: Resolvable,
        ) => Expr<ExprValue>;
        linear: () => InterpolationMethod;
        lineProgress: () => Expr<number>;
        literal: (value: Record<string, unknown> | unknown[]) => Expr<ExprValue>;
        ln: (input: NumberInput) => Expr<number>;
        ln2: () => Expr<number>;
        log10: (input: NumberInput) => Expr<number>;
        log2: (input: NumberInput) => Expr<number>;
        lt: (left: Resolvable, right: Resolvable) => Expr<boolean>;
        lte: (left: Resolvable, right: Resolvable) => Expr<boolean>;
        match: (
            input: Resolvable,
            ...casesAndFallback: (
                Resolvable
                | [(Resolvable | Resolvable[]), Resolvable]
            )[],
        ) => Expr<ExprValue>;
        max: (...inputs: NumberInput[]) => Expr<number>;
        min: (...inputs: NumberInput[]) => Expr<number>;
        mod: (a: NumberInput, b: NumberInput) => Expr<number>;
        multiply: (...inputs: NumberInput[]) => Expr<number>;
        neq: (left: Resolvable, right: Resolvable) => Expr<boolean>;
        not: (input: BooleanInput) => Expr<boolean>;
        numberFormat: (
            input: NumberInput,
            options?: NumberFormatOptions,
        ) => Expr<string>;
        pi: () => Expr<number>;
        pitch: () => Expr<number>;
        pow: (base: NumberInput, exponent: NumberInput) => Expr<number>;
        properties: () => Expr<Record<string, unknown>>;
        resolvedLocale: (input: Expr<ExprCollator>) => Expr<string>;
        rgb: (
            red: NumberInput,
            green: NumberInput,
            blue: NumberInput,
        ) => Expr<ExprColor>;
        rgba: (
            red: NumberInput,
            green: NumberInput,
            blue: NumberInput,
            alpha: NumberInput,
        ) => Expr<ExprColor>;
        round: (input: NumberInput) => Expr<number>;
        sin: (input: NumberInput) => Expr<number>;
        slice: (
            input: Resolvable,
            start: NumberInput,
            end?: NumberInput,
        ) => Expr<ExprValue>;
        sqrt: (input: NumberInput) => Expr<number>;
        step: (
            input: Resolvable,
            defaultOutput: Resolvable,
            ...stops: [number, Resolvable][],
        ) => Expr<ExprValue>;
        subtract: (a: NumberInput, b?: NumberInput) => Expr<number>;
        tan: (input: NumberInput) => Expr<number>;
        toBoolean: (input: Resolvable) => Expr<boolean>;
        toColor: (...inputs: Resolvable[]) => Expr<ExprColor>;
        toNumber: (...inputs: Resolvable[]) => Expr<number>;
        toRgba: (color: ColorInput) => Expr<number[]>;
        toString: (input: Resolvable) => Expr<string>;
        typeOf: (input: Resolvable) => Expr<string>;
        upcase: (input: StringInput) => Expr<string>;
        var: (name: string) => Expr<ExprValue>;
        within: (geometry: Expr<ExprValue> | GeoJsonGeometry) => Expr<boolean>;
        zoom: () => Expr<number>;
    } = ...

    Namespace object that groups all expression builder functions.

    Type Declaration

    import { expr } from "@honua/sdk";

    const fillColor = expr.step(
    expr.get("assessed_value"),
    "#f7fbff",
    [100_000, "#6baed6"],
    [500_000, "#08306b"],
    );

    map.addLayer({
    id: "parcel-fill",
    source: "parcels",
    type: "fill",
    paint: { "fill-color": fillColor.toJSON() },
    });