[{"_1":2,"_3":-5,"_4":-5},"loaderData",{"_5":6,"_7":8,"_9":10},"actionData","errors","root",{"_168":169,"_170":171},"routes/_app.x.$handle.$name",{"_11":12,"_13":14,"_15":16,"_18":19,"_17":-7,"_127":-5,"_20":128,"_22":129,"_130":131,"_132":133,"_25":134,"_24":-5,"_135":-5,"_136":-5,"_137":54,"_138":139,"_140":54,"_141":-5,"_142":-5,"_143":144},"routes/_app.x.$handle.$name.branch.$branch.code.$",{"_11":12,"_13":14,"_15":16,"_17":-7,"_18":19,"_20":21,"_22":23,"_24":-7,"_25":26,"_27":-5,"_28":-5,"_29":-5,"_30":-5,"_31":-5},"handle","postpostscript","name","interruptibleChain","branchName","main","version","path","","project",{"_34":74,"_13":14,"_46":75,"_76":-5,"_77":45,"_78":79,"_80":79,"_81":-5,"_82":-5,"_83":84,"_85":-5,"_86":45,"_87":-5,"_88":-5,"_89":62,"_90":91,"_92":-5,"_93":-5,"_94":-5,"_95":-5,"_96":97,"_98":97,"_99":100,"_101":100,"_102":100,"_103":97,"_104":97,"_105":106,"_107":108,"_109":110,"_111":54},"tree",[65,66],"file","contents",[32,33],"upstream","pull","ahead","behind","envVars",{"_34":57,"_13":58,"_37":59,"_39":-5,"_40":41,"_42":60,"_44":45,"_46":61,"_17":62,"_49":24,"_51":63,"_53":54,"_55":-5,"_18":64},{"_34":35,"_13":36,"_37":38,"_39":-5,"_40":41,"_42":43,"_44":45,"_46":47,"_17":48,"_49":50,"_51":52,"_53":54,"_55":-5,"_18":56},"id","f25ea5c2-275f-11f0-86ff-569c3dd06744","main.tsx","fileId","f25260be-275f-11f0-86ff-569c3dd06744","parentId","branchId","f24fd81c-275f-11f0-86ff-569c3dd06744","branchVersion",3,"latest",true,"createdAt",["D",1736392468981],2,"fileType","script","content","import type { MaybePromise } from \"https://esm.town/v/postpostscript/typeUtils\";\n\nexport function $chain(method: InterruptibleChainMethod): InterruptibleChain;\nexport function $chain(): InterruptibleChain;\nexport function $chain(\n method?: InterruptibleChainMethod,\n): InterruptibleChain | InterruptibleChain {\n if (!method) {\n const chain = $chain(() => {\n // never called\n return undefined;\n });\n chain.index = -1;\n return chain;\n }\n return new InterruptibleChain(method);\n}\n\nexport class InterruptibleChain {\n index = 0;\n parent: InterruptibleChain | undefined;\n method: InterruptibleChainMethod;\n\n constructor(method: InterruptibleChainMethod) {\n this.method = method;\n }\n\n then(method: InterruptibleChainMethod | InterruptibleChain): InterruptibleChain {\n let _method = typeof method === \"object\" ? subchainMethod(method) : method;\n const child = new InterruptibleChain(_method);\n if (this.index === -1) {\n return child;\n }\n child.index = this.index + 1;\n child.parent = this;\n return child;\n }\n\n init(state: InterruptibleChainState = {\n index: 0,\n value: undefined,\n }) {\n return new InterruptibleChainHandle(this, state);\n }\n}\n\nexport class InterruptibleChainHandle {\n state: InterruptibleChainState;\n chain: InterruptibleChain;\n interrupt: Interrupt | undefined = undefined;\n\n constructor(chain: InterruptibleChain, state: InterruptibleChainState = {\n index: 0,\n value: undefined,\n }) {\n this.chain = chain;\n this.state = state;\n }\n\n get done() {\n return this.state.index === this.chain.index + 1;\n }\n\n async advance(): Promise> {\n if (this.done) {\n throw new Error(\"chain is complete\");\n }\n this.interrupt = undefined;\n let chain: InterruptibleChain = this.chain;\n while (this.state.index < chain.index) {\n chain = chain.parent!;\n }\n let value: T | Interrupt;\n try {\n value = await chain.method(this.state.value, (reason, intermediateState) => {\n return new Interrupt(reason, chain, intermediateState);\n }, this.state.intermediateState);\n } catch (err) {\n if (err instanceof Interrupt) {\n value = err;\n } else {\n value = new Interrupt(err, chain);\n }\n }\n if (value instanceof Interrupt) {\n this.interrupt = value;\n if (value.intermediateState !== undefined) {\n this.state.intermediateState = value.intermediateState;\n } else if (\"intermediateState\" in this.state) {\n delete this.state.intermediateState;\n }\n return this;\n }\n this.state.value = value;\n if (\"intermediateState\" in this.state) {\n delete this.state.intermediateState;\n }\n this.state.index += 1;\n return this;\n }\n\n async untilDone(): Promise<\n {\n done: true;\n value: T;\n handle: InterruptibleChainHandle;\n } | {\n done: false;\n interrupt: Interrupt;\n handle: InterruptibleChainHandle;\n }\n > {\n this.interrupt = undefined;\n while (!(this.done || this.interrupt)) {\n await this.advance();\n }\n if (this.interrupt) {\n return {\n done: false,\n interrupt: this.interrupt,\n handle: this,\n };\n }\n return {\n done: true,\n value: this.state.value,\n handle: this,\n };\n }\n}\n\nexport class Interrupt {\n reason: T;\n chain: InterruptibleChain;\n intermediateState: IntermediateState | undefined;\n\n constructor(reason: T, chain: InterruptibleChain, intermediateState?: IntermediateState) {\n this.reason = reason;\n this.chain = chain;\n this.intermediateState = intermediateState;\n }\n}\n\nexport type IntermediateState = any;\n\nexport type InterruptibleChainMethod = (\n result: P,\n interrupt: (reason: R, intermediateState?: IntermediateState) => Interrupt,\n intermediateState?: IntermediateState,\n) => MaybePromise;\n\nexport type InterruptibleChainState = {\n index: number;\n value: any;\n intermediateState?: IntermediateState;\n};\n\ntype SubchainState = InterruptibleChainState | undefined;\n\nexport function subchainMethod(chain: InterruptibleChain): InterruptibleChainMethod {\n return async (previous, interrupt, intermediateState: SubchainState) => {\n const status = await chain.init(\n intermediateState || {\n index: 0,\n value: previous,\n },\n ).untilDone();\n\n if (status.done) {\n return status.value;\n } else {\n return interrupt(\n `subchain interrupted: ${status.interrupt.reason}`,\n status.handle.state,\n );\n }\n };\n}\n\nexport function join[]>(\n ...chains: Chains\n): InterruptibleChain> {\n let chain: InterruptibleChain = $chain((previous) => [[], previous]);\n\n for (const subchain of chains) {\n chain = chain.then(async ([result, previous], interrupt, intermediateState: SubchainState) => {\n const value = await subchainMethod(subchain)(undefined, interrupt, intermediateState);\n\n if (value instanceof Interrupt) {\n return value;\n }\n\n return [[\n ...result,\n value,\n ], undefined];\n });\n }\n\n chain = chain.then(([result, _]) => result);\n\n return chain as InterruptibleChain>;\n}\n\nexport type InterruptibleChainJoinResult[], Return extends any[] = []> =\n List extends [infer Chain extends InterruptibleChain, ...infer Rest extends InterruptibleChain[]]\n ? InterruptibleChainJoinResult<\n Rest,\n [...Return, (Chain extends InterruptibleChain ? Awaited : never)]\n >\n : Return;\n\nexport function append[]>(\n ...chains: Chains\n): InterruptibleChain> {\n let chain = chains[0];\n\n for (const next of chains) {\n chain = chain.then(next);\n }\n\n return chain;\n}\n\nexport type AppendResult[]> = List extends\n [infer Chain extends InterruptibleChain]\n ? (Chain extends InterruptibleChain ? Awaited : never)\n : (List extends [any, ...infer Rest extends InterruptibleChain[]] ? AppendResult<\n Rest\n >\n : never);","deleted",false,"label",[36],"f25265aa-275f-11f0-86ff-569c3dd06744","README.md","f2526636-275f-11f0-86ff-569c3dd06744",1,["D",1736214381259],0,"# interruptibleChain: simple interface for pausing and resuming execution chains\n\n[⚠️ Moved to GitHub ⚠️](https://github.com/postpostscript/chain)\n\n```ts\nimport { $chain } from \"https://esm.town/v/postpostscript/interruptibleChain\";\n\nconst multiply = $chain()\n .then(() => 1)\n .then((x) => x + 3)\n .then(async (x) => {\n await new Promise((resolve) => setTimeout(resolve, 1000));\n return x * 2;\n });\n\nconst handle = multiply.init();\nconsole.log(await handle.untilDone());\n// { done: true, value: 8, handle: InterruptibleChainHandle { ... } }\n\nconst handle2 = multiply.init({\n index: 2,\n value: 4,\n});\nawait handle2.advance();\nconsole.log(handle2.done, handle2.state);\n// true { index: 3, value: 8 }\n\n/**** Interrupts ****/\n\nconst handle3 = $chain().then(() => {\n throw new Error(\"failed\");\n}).init();\nawait handle3.advance();\nconsole.log(handle3.done, handle3.interrupt);\n// false Interrupt { reason: Error: failed, chain: InterruptibleChain { index: 0 } }\n\nconsole.log(await handle3.untilDone());\n// { done: false, interrupt: Interrupt { ... }, handle: InterruptibleChainHandle { ... } }\n\nconst handle4 = $chain().then((_, interrupt) => {\n return interrupt(\"call me later\");\n}).init();\nawait handle4.advance()\nconsole.log(handle4.done, handle4.interrupt);\n// false Interrupt { reason: \"call me later\", chain: InterruptibleChain { index: 0 } }\n```\n\nMigrated from folder: 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