import { MatrixArray } from '../core/matrix';
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import Transformable, { TransformProp } from '../core/Transformable';
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import Displayable from '../graphic/Displayable';
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import { GradientObject } from '../graphic/Gradient';
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import { LinearGradientObject } from '../graphic/LinearGradient';
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import Path from '../graphic/Path';
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import { ImagePatternObject, PatternObject, SVGPatternObject } from '../graphic/Pattern';
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import { RadialGradientObject } from '../graphic/RadialGradient';
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export declare function normalizeColor(color: string): {
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color: string;
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opacity: number;
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};
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export declare function isAroundZero(transform: number): boolean;
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export declare function round3(transform: number): number;
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export declare function round4(transform: number): number;
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export declare function round1(transform: number): number;
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export declare function getMatrixStr(m: MatrixArray): string;
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export declare const TEXT_ALIGN_TO_ANCHOR: {
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left: string;
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right: string;
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center: string;
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middle: string;
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};
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export declare function adjustTextY(y: number, lineHeight: number, textBaseline: CanvasTextBaseline): number;
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export declare function hasShadow(style: Displayable['style']): any;
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export declare function getShadowKey(displayable: Displayable): string;
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export declare function getClipPathsKey(clipPaths: Path[]): string;
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export declare function isImagePattern(val: any): val is ImagePatternObject;
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export declare function isSVGPattern(val: any): val is SVGPatternObject;
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export declare function isPattern(val: any): val is PatternObject;
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export declare function isLinearGradient(val: GradientObject): val is LinearGradientObject;
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export declare function isRadialGradient(val: GradientObject): val is RadialGradientObject;
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export declare function isGradient(val: any): val is GradientObject;
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export declare function getIdURL(id: string): string;
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export declare function getPathPrecision(el: Path): number;
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export declare function getSRTTransformString(transform: Partial<Pick<Transformable, TransformProp>>): string;
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export declare const encodeBase64: (str: string) => string;
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