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{"version":3,"file":"private-async-helpers.js","sources":["../../src/directives/private-async-helpers.ts"],"sourcesContent":["/**\n * @license\n * Copyright 2021 Google LLC\n * SPDX-License-Identifier: BSD-3-Clause\n */\n\n// Note, this module is not included in package exports so that it's private to\n// our first-party directives. If it ends up being useful, we can open it up and\n// export it.\n\n/**\n * Helper to iterate an AsyncIterable in its own closure.\n * @param iterable The iterable to iterate\n * @param callback The callback to call for each value. If the callback returns\n * `false`, the loop will be broken.\n */\nexport const forAwaitOf = async <T>(\n iterable: AsyncIterable<T>,\n callback: (value: T) => Promise<boolean>\n) => {\n for await (const v of iterable) {\n if ((await callback(v)) === false) {\n return;\n }\n }\n};\n\n/**\n * Holds a reference to an instance that can be disconnected and reconnected,\n * so that a closure over the ref (e.g. in a then function to a promise) does\n * not strongly hold a ref to the instance. Approximates a WeakRef but must\n * be manually connected & disconnected to the backing instance.\n */\nexport class PseudoWeakRef<T> {\n private _ref?: T;\n constructor(ref: T) {\n this._ref = ref;\n }\n /**\n * Disassociates the ref with the backing instance.\n */\n disconnect() {\n this._ref = undefined;\n }\n /**\n * Reassociates the ref with the backing instance.\n */\n reconnect(ref: T) {\n this._ref = ref;\n }\n /**\n * Retrieves the backing instance (will be undefined when disconnected)\n */\n deref() {\n return this._ref;\n }\n}\n\n/**\n * A helper to pause and resume waiting on a condition in an async function\n */\nexport class Pauser {\n private _promise?: Promise<void> = undefined;\n private _resolve?: () => void = undefined;\n /**\n * When paused, returns a promise to be awaited; when unpaused, returns\n * undefined. Note that in the microtask between the pauser being resumed\n * an an await of this promise resolving, the pauser could be paused again,\n * hence callers should check the promise in a loop when awaiting.\n * @returns A promise to be awaited when paused or undefined\n */\n get() {\n return this._promise;\n }\n /**\n * Creates a promise to be awaited\n */\n pause() {\n this._promise ??= new Promise((resolve) => (this._resolve = resolve));\n }\n /**\n * Resolves the promise which may be awaited\n */\n resume() {\n this._resolve?.();\n this._promise = this._resolve = undefined;\n }\n}\n"],"names":["forAwaitOf","async","iterable","callback","v","PseudoWeakRef","constructor","ref","this","_ref","disconnect","undefined","reconnect","deref","Pauser","_promise","_resolve","get","pause","_a","Promise","resolve","resume","call"],"mappings":";;;;;AAgBa,MAAAA,EAAaC,MACxBC,EACAC,KAEA,UAAW,MAAMC,KAAKF,EACpB,IAA4B,UAAjBC,EAASC,GAClB,MAEH,QASUC,EAEXC,YAAYC,GACVC,KAAKC,EAAOF,CACb,CAIDG,aACEF,KAAKC,OAAOE,CACb,CAIDC,UAAUL,GACRC,KAAKC,EAAOF,CACb,CAIDM,QACE,OAAOL,KAAKC,CACb,QAMUK,EAAbR,cACUE,KAAQO,OAAmBJ,EAC3BH,KAAQQ,OAAgBL,CAwBjC,CAhBCM,MACE,OAAOT,KAAKO,CACb,CAIDG,cACE,QAAAC,EAAAX,KAAKO,SAAL,IAAAI,IAAAX,KAAKO,EAAa,IAAIK,SAASC,GAAab,KAAKQ,EAAWK,IAC7D,CAIDC,eACe,QAAbH,EAAAX,KAAKQ,SAAQ,IAAAG,GAAAA,EAAAI,KAAAf,MACbA,KAAKO,EAAWP,KAAKQ,OAAWL,CACjC"}
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