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Licensed to the Apache Software Foundation (ASF) under one\n// or more contributor license agreements. See the NOTICE file\n// distributed with this work for additional information\n// regarding copyright ownership. The ASF licenses this file\n// to you under the Apache License, Version 2.0 (the\n// \"License\"); you may not use this file except in compliance\n// with the License. You may obtain a copy of the License at\n//\n// http://www.apache.org/licenses/LICENSE-2.0\n//\n// Unless required by applicable law or agreed to in writing,\n// software distributed under the License is distributed on an\n// \"AS IS\" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY\n// KIND, either express or implied. See the License for the\n// specific language governing permissions and limitations\n// under the License.\n\nimport { ReadableInterop, ArrowJSONLike } from '../io/interfaces';\n\n/** @ignore */\ntype FSReadStream = import('fs').ReadStream;\n/** @ignore */\ntype FileHandle = import('fs').promises.FileHandle;\n\n/** @ignore */\nexport interface Subscription {\n unsubscribe: () => void;\n}\n\n/** @ignore */\nexport interface Observer<T> {\n closed?: boolean;\n next: (value: T) => void;\n error: (err: any) => void;\n complete: () => void;\n}\n\n/** @ignore */\nexport interface Observable<T> {\n subscribe: (observer: Observer<T>) => Subscription;\n}\n\n/** @ignore */\nconst [BigIntCtor, BigIntAvailable] = (() => {\n const BigIntUnavailableError = () => { throw new Error('BigInt is not available in this environment'); };\n function BigIntUnavailable() { throw BigIntUnavailableError(); }\n BigIntUnavailable.asIntN = () => { throw BigIntUnavailableError(); };\n BigIntUnavailable.asUintN = () => { throw BigIntUnavailableError(); };\n return typeof BigInt !== 'undefined' ? [BigInt, true] : [<any> BigIntUnavailable, false];\n})() as [BigIntConstructor, boolean];\n\n/** @ignore */\nconst [BigInt64ArrayCtor, BigInt64ArrayAvailable] = (() => {\n const BigInt64ArrayUnavailableError = () => { throw new Error('BigInt64Array is not available in this environment'); };\n class BigInt64ArrayUnavailable {\n static get BYTES_PER_ELEMENT() { return 8; }\n static of() { throw BigInt64ArrayUnavailableError(); }\n static from() { throw BigInt64ArrayUnavailableError(); }\n constructor() { throw BigInt64ArrayUnavailableError(); }\n }\n return typeof BigInt64Array !== 'undefined' ? [BigInt64Array, true] : [<any> BigInt64ArrayUnavailable, false];\n})() as [BigInt64ArrayConstructor, boolean];\n\n/** @ignore */\nconst [BigUint64ArrayCtor, BigUint64ArrayAvailable] = (() => {\n const BigUint64ArrayUnavailableError = () => { throw new Error('BigUint64Array is not available in this environment'); };\n class BigUint64ArrayUnavailable {\n static get BYTES_PER_ELEMENT() { return 8; }\n static of() { throw BigUint64ArrayUnavailableError(); }\n static from() { throw BigUint64ArrayUnavailableError(); }\n constructor() { throw BigUint64ArrayUnavailableError(); }\n }\n return typeof BigUint64Array !== 'undefined' ? [BigUint64Array, true] : [<any> BigUint64ArrayUnavailable, false];\n})() as [BigUint64ArrayConstructor, boolean];\n\nexport { BigIntCtor as BigInt, BigIntAvailable };\nexport { BigInt64ArrayCtor as BigInt64Array, BigInt64ArrayAvailable };\nexport { BigUint64ArrayCtor as BigUint64Array, BigUint64ArrayAvailable };\n\n/** @ignore */ const isNumber = (x: any) => typeof x === 'number';\n/** @ignore */ const isBoolean = (x: any) => typeof x === 'boolean';\n/** @ignore */ const isFunction = (x: any) => typeof x === 'function';\n/** @ignore */\nexport const isObject = (x: any): x is Object => x != null && Object(x) === x;\n\n/** @ignore */\nexport const isPromise = <T = any>(x: any): x is PromiseLike<T> => {\n return isObject(x) && isFunction(x.then);\n};\n\n/** @ignore */\nexport const isObservable = <T = any>(x: any): x is Observable<T> => {\n return isObject(x) && isFunction(x.subscribe);\n};\n\n/** @ignore */\nexport const isIterable = <T = any>(x: any): x is Iterable<T> => {\n return isObject(x) && isFunction(x[Symbol.iterator]);\n};\n\n/** @ignore */\nexport const isAsyncIterable = <T = any>(x: any): x is AsyncIterable<T> => {\n return isObject(x) && isFunction(x[Symbol.asyncIterator]);\n};\n\n/** @ignore */\nexport const isArrowJSON = (x: any): x is ArrowJSONLike => {\n return isObject(x) && isObject(x['schema']);\n};\n\n/** @ignore */\nexport const isArrayLike = <T = any>(x: any): x is ArrayLike<T> => {\n return isObject(x) && isNumber(x['length']);\n};\n\n/** @ignore */\nexport const isIteratorResult = <T = any>(x: any): x is IteratorResult<T> => {\n return isObject(x) && ('done' in x) && ('value' in x);\n};\n\n/** @ignore */\nexport const isUnderlyingSink = <T = any>(x: any): x is UnderlyingSink<T> => {\n return isObject(x) &&\n isFunction(x['abort']) &&\n isFunction(x['close']) &&\n isFunction(x['start']) &&\n isFunction(x['write']);\n};\n\n/** @ignore */\nexport const isFileHandle = (x: any): x is FileHandle => {\n return isObject(x) && isFunction(x['stat']) && isNumber(x['fd']);\n};\n\n/** @ignore */\nexport const isFSReadStream = (x: any): x is FSReadStream => {\n return isReadableNodeStream(x) && isNumber((<any> x)['bytesRead']);\n};\n\n/** @ignore */\nexport const isFetchResponse = (x: any): x is Response => {\n return isObject(x) && isReadableDOMStream(x['body']);\n};\n\n/** @ignore */\nexport const isWritableDOMStream = <T = any>(x: any): x is WritableStream<T> => {\n return isObject(x) &&\n isFunction(x['abort']) &&\n isFunction(x['getWriter']) &&\n !(x instanceof ReadableInterop);\n};\n\n/** @ignore */\nexport const isReadableDOMStream = <T = any>(x: any): x is ReadableStream<T> => {\n return isObject(x) &&\n isFunction(x['cancel']) &&\n isFunction(x['getReader']) &&\n !(x instanceof ReadableInterop);\n};\n\n/** @ignore */\nexport const isWritableNodeStream = (x: any): x is NodeJS.WritableStream => {\n return isObject(x) &&\n isFunction(x['end']) &&\n isFunction(x['write']) &&\n isBoolean(x['writable']) &&\n !(x instanceof ReadableInterop);\n};\n\n/** @ignore */\nexport const isReadableNodeStream = (x: any): x is NodeJS.ReadableStream => {\n return isObject(x) &&\n isFunction(x['read']) &&\n isFunction(x['pipe']) &&\n isBoolean(x['readable']) &&\n !(x instanceof ReadableInterop);\n};\n"]} |