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{"version":3,"file":"signals-core.js","sources":["../src/index.ts"],"sourcesContent":["function cycleDetected(): never {\n\tthrow new Error(\"Cycle detected\");\n}\n\n// Flags for Computed and Effect.\nconst RUNNING = 1 << 0;\nconst NOTIFIED = 1 << 1;\nconst OUTDATED = 1 << 2;\nconst DISPOSED = 1 << 3;\nconst HAS_ERROR = 1 << 4;\nconst TRACKING = 1 << 5;\n\n// A linked list node used to track dependencies (sources) and dependents (targets).\n// Also used to remember the source's last version number that the target saw.\ntype Node = {\n\t// A source whose value the target depends on.\n\t_source: Signal;\n\t_prevSource?: Node;\n\t_nextSource?: Node;\n\n\t// A target that depends on the source and should be notified when the source changes.\n\t_target: Computed | Effect;\n\t_prevTarget?: Node;\n\t_nextTarget?: Node;\n\n\t// The version number of the source that target has last seen. We use version numbers\n\t// instead of storing the source value, because source values can take arbitrary amount\n\t// of memory, and computeds could hang on to them forever because they're lazily evaluated.\n\t// Use the special value -1 to mark potentially unused but recyclable nodes.\n\t_version: number;\n\n\t// Used to remember & roll back the source's previous `._node` value when entering &\n\t// exiting a new evaluation context.\n\t_rollbackNode?: Node;\n};\n\nfunction startBatch() {\n\tbatchDepth++;\n}\n\nfunction endBatch() {\n\tif (batchDepth > 1) {\n\t\tbatchDepth--;\n\t\treturn;\n\t}\n\n\tlet error: unknown;\n\tlet hasError = false;\n\n\twhile (batchedEffect !== undefined) {\n\t\tlet effect: Effect | undefined = batchedEffect;\n\t\tbatchedEffect = undefined;\n\n\t\tbatchIteration++;\n\n\t\twhile (effect !== undefined) {\n\t\t\tconst next: Effect | undefined = effect._nextBatchedEffect;\n\t\t\teffect._nextBatchedEffect = undefined;\n\t\t\teffect._flags &= ~NOTIFIED;\n\n\t\t\tif (!(effect._flags & DISPOSED) && needsToRecompute(effect)) {\n\t\t\t\ttry {\n\t\t\t\t\teffect._callback();\n\t\t\t\t} catch (err) {\n\t\t\t\t\tif (!hasError) {\n\t\t\t\t\t\terror = err;\n\t\t\t\t\t\thasError = true;\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t\teffect = next;\n\t\t}\n\t}\n\tbatchIteration = 0;\n\tbatchDepth--;\n\n\tif (hasError) {\n\t\tthrow error;\n\t}\n}\n\nfunction batch<T>(callback: () => T): T {\n\tif (batchDepth > 0) {\n\t\treturn callback();\n\t}\n\t/*@__INLINE__**/ startBatch();\n\ttry {\n\t\treturn callback();\n\t} finally {\n\t\tendBatch();\n\t}\n}\n\n// Currently evaluated computed or effect.\nlet evalContext: Computed | Effect | undefined = undefined;\n\n// Effects collected into a batch.\nlet batchedEffect: Effect | undefined = undefined;\nlet batchDepth = 0;\nlet batchIteration = 0;\n\n// A global version number for signals, used for fast-pathing repeated\n// computed.peek()/computed.value calls when nothing has changed globally.\nlet globalVersion = 0;\n\nfunction addDependency(signal: Signal): Node | undefined {\n\tif (evalContext === undefined) {\n\t\treturn undefined;\n\t}\n\n\tlet node = signal._node;\n\tif (node === undefined || node._target !== evalContext) {\n\t\t// `signal` is a new dependency. Create a new node dependency node, move it\n\t\t// to the front of the current context's dependency list.\n\t\tnode = {\n\t\t\t_version: 0,\n\t\t\t_source: signal,\n\t\t\t_prevSource: undefined,\n\t\t\t_nextSource: evalContext._sources,\n\t\t\t_target: evalContext,\n\t\t\t_prevTarget: undefined,\n\t\t\t_nextTarget: undefined,\n\t\t\t_rollbackNode: node,\n\t\t};\n\t\tevalContext._sources = node;\n\t\tsignal._node = node;\n\n\t\t// Subscribe to change notifications from this dependency if we're in an effect\n\t\t// OR evaluating a computed signal that in turn has subscribers.\n\t\tif (evalContext._flags & TRACKING) {\n\t\t\tsignal._subscribe(node);\n\t\t}\n\t\treturn node;\n\t} else if (node._version === -1) {\n\t\t// `signal` is an existing dependency from a previous evaluation. Reuse it.\n\t\tnode._version = 0;\n\n\t\t// If `node` is not already the current head of the dependency list (i.e.\n\t\t// there is a previous node in the list),
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