1 | /**
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2 | * Simpler helper method to check for undefined simply for the benefit of
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3 | * gaining better compression when minified by not needing to have multiple
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4 | * comparisons to the `undefined` keyword in the codebase.
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5 | */
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6 | export declare function isUndefined(value: any): value is undefined;
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7 | /**
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8 | * Simpler helper method to check for a boolean type simply for the benefit of
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9 | * gaining better compression when minified by not needing to have multiple
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10 | * `typeof` comparisons in the codebase.
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11 | */
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12 | export declare function isBoolean(value: any): value is boolean;
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13 | /**
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14 | * Assigns (shallow copies) the properties of `src` onto `dest`, if the
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15 | * corresponding property on `dest` === `undefined`.
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16 | *
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17 | * @param {Object} dest The destination object.
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18 | * @param {Object} src The source object.
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19 | * @return {Object} The destination object (`dest`)
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20 | */
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21 | export declare function defaults(dest: any, src: any): any;
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22 | /**
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23 | * Truncates the `str` at `len - ellipsisChars.length`, and adds the `ellipsisChars` to the
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24 | * end of the string (by default, two periods: '..'). If the `str` length does not exceed
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25 | * `len`, the string will be returned unchanged.
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26 | *
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27 | * @param {String} str The string to truncate and add an ellipsis to.
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28 | * @param {Number} truncateLen The length to truncate the string at.
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29 | * @param {String} [ellipsisChars=...] The ellipsis character(s) to add to the end of `str`
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30 | * when truncated. Defaults to '...'
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31 | */
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32 | export declare function ellipsis(str: string, truncateLen: number, ellipsisChars?: string): string;
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33 | /**
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34 | * Removes array elements by value. Mutates the input array.
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35 | *
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36 | * Using this instead of the ES5 Array.prototype.filter() function to prevent
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37 | * creating many new arrays in memory for removing an element.
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38 | *
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39 | * @param arr The array to remove elements from. This array is mutated.
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40 | * @param fn The element to remove.
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41 | */
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42 | export declare function remove<T>(arr: T[], item: T): void;
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43 | /**
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44 | * Removes array elements based on a filtering function. Mutates the input
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45 | * array.
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46 | *
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47 | * Using this instead of the ES5 Array.prototype.filter() function to prevent
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48 | * creating many new arrays in memory for filtering.
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49 | *
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50 | * @param arr The array to remove elements from. This array is mutated.
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51 | * @param fn The predicate function which should return `true` to remove an
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52 | * element.
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53 | */
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54 | export declare function removeWithPredicate<T>(arr: T[], fn: (item: T) => boolean): void;
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55 | /**
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56 | * Function that should never be called but is used to check that every
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57 | * enum value is handled using TypeScript's 'never' type.
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58 | */
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59 | export declare function assertNever(theValue: never): void;
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