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node_modules/@tanstack/virtual-core/src/utils.ts

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+export type NoInfer<A extends any> = [A][A extends any ? 0 : never]
+
+export type PartialKeys<T, K extends keyof T> = Omit<T, K> & Partial<Pick<T, K>>
+
+export function memo<TDeps extends ReadonlyArray<any>, TResult>(
+  getDeps: () => [...TDeps],
+  fn: (...args: NoInfer<[...TDeps]>) => TResult,
+  opts: {
+    key: false | string
+    debug?: () => boolean
+    onChange?: (result: TResult) => void
+    initialDeps?: TDeps
+  },
+) {
+  let deps = opts.initialDeps ?? []
+  let result: TResult | undefined
+
+  function memoizedFunction(): TResult {
+    let depTime: number
+    if (opts.key && opts.debug?.()) depTime = Date.now()
+
+    const newDeps = getDeps()
+
+    const depsChanged =
+      newDeps.length !== deps.length ||
+      newDeps.some((dep: any, index: number) => deps[index] !== dep)
+
+    if (!depsChanged) {
+      return result!
+    }
+
+    deps = newDeps
+
+    let resultTime: number
+    if (opts.key && opts.debug?.()) resultTime = Date.now()
+
+    result = fn(...newDeps)
+
+    if (opts.key && opts.debug?.()) {
+      const depEndTime = Math.round((Date.now() - depTime!) * 100) / 100
+      const resultEndTime = Math.round((Date.now() - resultTime!) * 100) / 100
+      const resultFpsPercentage = resultEndTime / 16
+
+      const pad = (str: number | string, num: number) => {
+        str = String(str)
+        while (str.length < num) {
+          str = ' ' + str
+        }
+        return str
+      }
+
+      console.info(
+        `%c⏱ ${pad(resultEndTime, 5)} /${pad(depEndTime, 5)} ms`,
+        `
+            font-size: .6rem;
+            font-weight: bold;
+            color: hsl(${Math.max(
+              0,
+              Math.min(120 - 120 * resultFpsPercentage, 120),
+            )}deg 100% 31%);`,
+        opts?.key,
+      )
+    }
+
+    opts?.onChange?.(result)
+
+    return result
+  }
+
+  // Attach updateDeps to the function itself
+  memoizedFunction.updateDeps = (newDeps: [...TDeps]) => {
+    deps = newDeps
+  }
+
+  return memoizedFunction
+}
+
+export function notUndefined<T>(value: T | undefined, msg?: string): T {
+  if (value === undefined) {
+    throw new Error(`Unexpected undefined${msg ? `: ${msg}` : ''}`)
+  } else {
+    return value
+  }
+}
+
+export const approxEqual = (a: number, b: number) => Math.abs(a - b) <= 1
+
+export const debounce = (
+  targetWindow: Window & typeof globalThis,
+  fn: Function,
+  ms: number,
+) => {
+  let timeoutId: number
+  return function (this: any, ...args: Array<any>) {
+    targetWindow.clearTimeout(timeoutId)
+    timeoutId = targetWindow.setTimeout(() => fn.apply(this, args), ms)
+  }
+}