@tldraw/editor/dist-esm/lib/hooks/useIdentity.mjs.map

tldraw infinite canvas SDK (editor).

{
  "version": 3,
  "sources": ["../../../src/lib/hooks/useIdentity.tsx"],
  "sourcesContent": ["import { areArraysShallowEqual, areObjectsShallowEqual } from '@tldraw/utils'\nimport { useRef } from 'react'\n\nfunction useIdentity<T>(value: T, isEqual: (a: T, b: T) => boolean): T {\n\tconst ref = useRef(value)\n\tif (isEqual(value, ref.current)) {\n\t\treturn ref.current\n\t}\n\tref.current = value\n\treturn value\n}\n\nconst areNullableArraysShallowEqual = (\n\ta: readonly any[] | null | undefined,\n\tb: readonly any[] | null | undefined\n) => {\n\ta ??= null\n\tb ??= null\n\tif (a === b) {\n\t\treturn true\n\t}\n\tif (!a || !b) {\n\t\treturn false\n\t}\n\treturn areArraysShallowEqual(a, b)\n}\n\n/** @internal */\nexport function useShallowArrayIdentity<T extends readonly any[] | null | undefined>(arr: T): T {\n\treturn useIdentity(arr, areNullableArraysShallowEqual)\n}\n\nconst areNullableObjectsShallowEqual = (\n\ta: object | null | undefined,\n\tb: object | null | undefined\n) => {\n\ta ??= null\n\tb ??= null\n\tif (a === b) {\n\t\treturn true\n\t}\n\tif (!a || !b) {\n\t\treturn false\n\t}\n\treturn areObjectsShallowEqual(a, b)\n}\n\n/** @internal */\nexport function useShallowObjectIdentity<T extends object | null | undefined>(obj: T): T {\n\treturn useIdentity(obj, areNullableObjectsShallowEqual)\n}\n"],
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