feat: migration 2

packages/core/src/math/NaNFallback.ts

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+export function NaNFallback(value: number, fallback: number) {
+  return isNaN(value) ? fallback : value;
+}

packages/core/src/math/axis.ts

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+import { Vector3 } from 'three';
+
+export const ZERO_VECTOR = new Vector3();
+export const I_HAT = new Vector3(1, 0, 0);
+export const J_HAT = new Vector3(0, 1, 0);
+export const K_HAT = new Vector3(0, 0, 1);

packages/core/src/math/formatCompact.ts

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+const numberFormat = Intl.NumberFormat('en', { notation: 'compact' });
+
+export function formatCompact(number: number) {
+  return numberFormat.format(number);
+}

packages/core/src/math/index.ts

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+export * from './axis';
+export * from './formatCompact';
+export * from './isNumber';
+export * from './NaNFallback';
+export * from './normalizeAngleRad';
+export * from './normalToEuler';
+export * from './numberToRomanNumeral';

packages/core/src/math/isNumber.ts

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+export default function isNumber(value: any) {
+  return typeof value === 'number' && isFinite(value);
+}

packages/core/src/math/normalToEuler.ts

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+import { Euler, Quaternion, Vector3 } from 'three';
+import { J_HAT } from './axis';
+
+const quaternion = new Quaternion();
+const axis = new Vector3();
+
+export function normalToEuler(normal: Vector3, up = J_HAT) {
+  return new Euler().setFromQuaternion(
+    quaternion.setFromAxisAngle(
+      axis.crossVectors(up, normal).normalize(),
+      up.angleTo(normal),
+    ),
+  );
+}

packages/core/src/math/normalizeAngleRad.ts

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+export function normalizeAngleRad(angle: number) {
+  const newAngle = angle % (2 * Math.PI);
+  if (newAngle > Math.PI) return newAngle - 2 * Math.PI;
+  if (newAngle < -Math.PI) return newAngle + 2 * Math.PI;
+  return newAngle;
+}

packages/core/src/math/numberToRomanNumeral.ts

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+/**
+ * Thanks, August!
+ * https://stackoverflow.com/a/41358305/12294756
+ */
+const ROMAN = {
+  M: 1000,
+  CM: 900,
+  D: 500,
+  CD: 400,
+  C: 100,
+  XC: 90,
+  L: 50,
+  XL: 40,
+  X: 10,
+  IX: 9,
+  V: 5,
+  IV: 4,
+  I: 1,
+};
+const ROMAN_KEYS = Object.keys(ROMAN) as (keyof typeof ROMAN)[];
+
+export default function numberToRomanNumeral(value: number) {
+  let string = '';
+
+  ROMAN_KEYS.forEach((index) => {
+    const part = Math.floor(value / ROMAN[index]);
+    value -= part * ROMAN[index];
+    string += index.repeat(part);
+  });
+
+  return string;
+}