@tldraw/state/dist-esm/lib/helpers.mjs.map

tldraw infinite canvas SDK (state).

{
  "version": 3,
  "sources": ["../../src/lib/helpers.ts"],
  "sourcesContent": ["import { Child, Signal } from './types'\n\n/**\n * Get whether the given value is a child.\n *\n * @param x The value to check.\n * @returns True if the value is a child, false otherwise.\n */\nfunction isChild(x: any): x is Child {\n\treturn x && typeof x === 'object' && 'parents' in x\n}\n\n/**\n * Get whether a child's parents have changed.\n *\n * @param child The child to check.\n * @returns True if the child's parents have changed, false otherwise.\n */\nexport function haveParentsChanged(child: Child): boolean {\n\tfor (let i = 0, n = child.parents.length; i < n; i++) {\n\t\t// Get the parent's value without capturing it.\n\t\tchild.parents[i].__unsafe__getWithoutCapture(true)\n\n\t\t// If the parent's epoch does not match the child's view of the parent's epoch, then the parent has changed.\n\t\tif (child.parents[i].lastChangedEpoch !== child.parentEpochs[i]) {\n\t\t\treturn true\n\t\t}\n\t}\n\n\treturn false\n}\n\n/**\n * Detach a child from a parent.\n *\n * @param parent The parent to detach from.\n * @param child The child to detach.\n */\nexport function detach(parent: Signal<any>, child: Child) {\n\t// If the child is not attached to the parent, do nothing.\n\tif (!parent.children.remove(child)) {\n\t\treturn\n\t}\n\n\t// If the parent has no more children, then detach the parent from its parents.\n\tif (parent.children.isEmpty && isChild(parent)) {\n\t\tfor (let i = 0, n = parent.parents.length; i < n; i++) {\n\t\t\tdetach(parent.parents[i], parent)\n\t\t}\n\t}\n}\n\n/**\n * Attach a child to a parent.\n *\n * @param parent The parent to attach to.\n * @param child The child to attach.\n */\nexport function attach(parent: Signal<any>, child: Child) {\n\t// If the child is already attached to the parent, do nothing.\n\tif (!parent.children.add(child)) {\n\t\treturn\n\t}\n\n\t// If the parent itself is a child, add the parent to the parent's parents.\n\tif (isChild(parent)) {\n\t\tfor (let i = 0, n = parent.parents.length; i < n; i++) {\n\t\t\tattach(parent.parents[i], parent)\n\t\t}\n\t}\n}\n\n/**\n * Get whether two values are equal (insofar as @tldraw/state is concerned).\n *\n * @param a The first value.\n * @param b The second value.\n */\nexport function equals(a: any, b: any): boolean {\n\tconst shallowEquals =\n\t\ta === b || Object.is(a, b) || Boolean(a && b && typeof a.equals === 'function' && a.equals(b))\n\treturn shallowEquals\n}\n\nexport declare function assertNever(x: never): never\n\nexport function singleton<T>(key: string, init: () => T): T {\n\tconst symbol = Symbol.for(`com.tldraw.state/${key}`)\n\tconst global = globalThis as any\n\tglobal[symbol] ??= init()\n\treturn global[symbol]\n}\n\n/**\n * @public\n */\nexport const EMPTY_ARRAY: [] = singleton('empty_array', () => Object.freeze([]) as any)\n\n/**\n * Does this signal have any active reactors attached to it? When it changes, will it cause anything to run?\n * @public\n */\nexport function hasReactors(signal: Signal<any>) {\n\tfor (const child of signal.children) {\n\t\tif (child.isActivelyListening) {\n\t\t\treturn true\n\t\t}\n\t}\n\n\treturn false\n}\n"],
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