Refactor (1)

packages/utils/biome.json

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+{
+  "extends": ["../../biome.json"]
+}

packages/utils/index.ts

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+export {};

packages/utils/package.json

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+{
+  "name": "@cannorin/utils",
+  "version": "0.0.1",
+  "private": true,
+  "exports": {
+    ".": "./index.ts",
+    "./headless": "./src/headless.ts",
+    "./array": "./src/array.ts",
+    "./vector": "./src/vector.ts",
+    "./multiset": "./src/multiset.ts"
+  },
+  "scripts": {
+    "build": "tsc",
+    "lint": "biome check",
+    "fix": "biome check --fix",
+    "test": "vitest"
+  },
+  "devDependencies": {
+    "typescript": "5.7.3",
+    "vitest": "3.2.4"
+  }
+}

packages/utils/src/array.ts

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+export const sample = <T>(arr: readonly T[]): T =>
+  arr[Math.floor(Math.random() * arr.length)] as T;
+
+export function sampleMany<T>(arr: T[], n: number = arr.length): T[] {
+  if (n > arr.length) return sampleMany(arr, arr.length);
+  const copy = [...arr];
+  for (let i = 0; i < n; i++) {
+    const j = i + Math.floor(Math.random() * (copy.length - i));
+    [copy[i], copy[j]] = [copy[j] as T, copy[i] as T];
+  }
+  return copy.slice(0, n);
+}

packages/utils/src/headless.ts

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+export {};
+
+declare global {
+  interface String {
+    startsWith<S extends string>(searchString: S): this is `${S}${string}`;
+    endsWith<S extends string>(searchString: S): this is `${string}${S}`;
+    includes<S extends string>(
+      searchString: S,
+      position?: number,
+    ): this is `${string}${S}${string}`;
+  }
+
+  type LiteralUnionLike<T> = T extends string
+    ? T extends ""
+      ? T
+      : T extends `${T}${T}`
+        ? never
+        : T
+    : T extends number
+      ? `${T}0` extends `${number}`
+        ? T
+        : never
+      : T extends null | undefined
+        ? T
+        : never;
+
+  interface Array<T> {
+    includes(
+      searchElement: T extends LiteralUnionLike<T> ? unknown : never,
+      fromIndex?: number,
+    ): searchElement is T extends LiteralUnionLike<T> ? T : never;
+  }
+
+  interface ReadonlyArray<T> {
+    includes(
+      searchElement: T extends LiteralUnionLike<T> ? unknown : never,
+      fromIndex?: number,
+    ): searchElement is T extends LiteralUnionLike<T> ? T : never;
+  }
+}

packages/utils/src/multiset.ts

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+export class MultiSet<T> extends Map<T, number> {
+  constructor(iterable?: Iterable<readonly [T, number]>) {
+    super();
+    if (iterable) {
+      for (const [item, count] of iterable) {
+        this.add(item, count);
+      }
+    }
+  }
+
+  /**
+   * Adds the specified item to the multiset.
+   * If the item already exists, its count is incremented.
+   *
+   * @param item The element to add.
+   * @param count The number of times to add the element (default is 1).
+   * @returns The current instance for chaining.
+   */
+  add(item: T, count = 1): this {
+    const currentCount = this.get(item) ?? 0;
+    this.set(item, currentCount + count);
+    return this;
+  }
+
+  /**
+   * Removes one or more instances of the specified item.
+   *
+   * @param item The element to remove.
+   * @param count The number of times to remove the element (default is 1).
+   * @returns True if the element was present, false otherwise.
+   */
+  remove(item: T, count = 1): boolean {
+    const currentCount = this.get(item);
+    if (currentCount === undefined) {
+      return false;
+    }
+    if (currentCount <= count) {
+      this.delete(item);
+    } else {
+      this.set(item, currentCount - count);
+    }
+    return true;
+  }
+
+  /**
+   * Retrieves the count of the specified item.
+   *
+   * @param item The element whose count is to be retrieved.
+   * @returns The number of occurrences of the element.
+   */
+  count(item: T): number {
+    return this.get(item) ?? 0;
+  }
+}

packages/utils/src/vector.ts

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+export type Vector = {
+  x: number;
+  y: number;
+};
+
+export type Radian = number;
+
+export const degree = (value: number) => ((value / 180) * Math.PI) as Radian;
+
+export const sub = (v1: Vector, v2: Vector) =>
+  ({
+    x: v1.x - v2.x,
+    y: v1.y - v2.y,
+  }) as Vector;
+
+export const add = (v1: Vector, v2: Vector) =>
+  ({
+    x: v1.x + v2.x,
+    y: v1.y + v2.y,
+  }) as Vector;
+
+export const theta = ({ x, y }: Vector) => Math.atan2(y, x) as Radian;
+
+export const rotate = ({ x, y }: Vector, rad: Radian) =>
+  ({
+    x: x * Math.cos(rad) - y * Math.sin(rad),
+    y: x * Math.sin(rad) + y * Math.cos(rad),
+  }) as Vector;

packages/utils/tsconfig.json

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+{
+  "extends": "@tsconfig/strictest/tsconfig.json",
+  "compilerOptions": {
+    "target": "esnext",
+    "lib": ["esnext"],
+    "module": "esnext",
+    "moduleResolution": "Bundler",
+    "resolveJsonModule": true,
+    "noEmit": true,
+    "allowSyntheticDefaultImports": true
+  }
+}