@jcoreio/abortable/index.mjs.map

memory-leak-proof function to wrap a promise to reject when a signal is aborted

{"version":3,"file":"index.mjs","names":["newAbortError","DOMException","noop","abortable","promise","signal","Promise","resolve","reject","cleanup","callbacks","removeEventListener","onAbort","then","value","error","aborted","addEventListener"],"sources":["src/index.ts"],"sourcesContent":["export const newAbortError = () =>\n  new DOMException('This operation was aborted', 'AbortError')\n\nconst noop = () => {}\n\nexport function abortable<T>(\n  promise: Promise<T>,\n  signal: AbortSignal | undefined\n): Promise<T> {\n  if (!signal) return promise\n  return new Promise<T>((resolve, reject) => {\n    const cleanup = () => {\n      const callbacks = { resolve, reject }\n      // Prevent memory leaks.  If the input promise never resolves, then the handlers\n      // below would retain this enclosing Promise's resolve and reject callbacks,\n      // which would retain the enclosing Promise and anything waiting on it.\n      // By replacing references to these callbacks, we enable the enclosing Promise to\n      // be garbage collected\n      resolve = noop\n      reject = noop\n      // Memory could also leak if the signal never aborts, unless we remove the abort\n      // handler\n      signal.removeEventListener('abort', onAbort)\n      return callbacks\n    }\n    const onAbort = () => cleanup().reject(newAbortError())\n\n    promise.then(\n      (value) => cleanup().resolve(value),\n      (error) => cleanup().reject(error)\n    )\n    if (signal.aborted) {\n      reject(newAbortError())\n    } else {\n      signal.addEventListener('abort', onAbort)\n    }\n  })\n}\n"],"mappings":"AAAA,OAAO,MAAMA,aAAa,GAAGA,CAAA,KAC3B,IAAIC,YAAY,CAAC,4BAA4B,EAAE,YAAY,CAAC;AAE9D,MAAMC,IAAI,GAAGA,CAAA,KAAM,CAAC,CAAC;AAErB,OAAO,SAASC,SAASA,CACvBC,OAAmB,EACnBC,MAA+B,EACnB;EACZ,IAAI,CAACA,MAAM,EAAE,OAAOD,OAAO;EAC3B,OAAO,IAAIE,OAAO,CAAI,CAACC,OAAO,EAAEC,MAAM,KAAK;IACzC,MAAMC,OAAO,GAAGA,CAAA,KAAM;MACpB,MAAMC,SAAS,GAAG;QAAEH,OAAO;QAAEC;MAAO,CAAC;MACrC;MACA;MACA;MACA;MACA;MACAD,OAAO,GAAGL,IAAI;MACdM,MAAM,GAAGN,IAAI;MACb;MACA;MACAG,MAAM,CAACM,mBAAmB,CAAC,OAAO,EAAEC,OAAO,CAAC;MAC5C,OAAOF,SAAS;IAClB,CAAC;IACD,MAAME,OAAO,GAAGA,CAAA,KAAMH,OAAO,CAAC,CAAC,CAACD,MAAM,CAACR,aAAa,CAAC,CAAC,CAAC;IAEvDI,OAAO,CAACS,IAAI,CACTC,KAAK,IAAKL,OAAO,CAAC,CAAC,CAACF,OAAO,CAACO,KAAK,CAAC,EAClCC,KAAK,IAAKN,OAAO,CAAC,CAAC,CAACD,MAAM,CAACO,KAAK,CACnC,CAAC;IACD,IAAIV,MAAM,CAACW,OAAO,EAAE;MAClBR,MAAM,CAACR,aAAa,CAAC,CAAC,CAAC;IACzB,CAAC,MAAM;MACLK,MAAM,CAACY,gBAAgB,CAAC,OAAO,EAAEL,OAAO,CAAC;IAC3C;EACF,CAAC,CAAC;AACJ","ignoreList":[]}