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Diffstat (limited to 'alarm/node_modules/graphql/polyfills/arrayFrom.js.flow')
-rw-r--r-- | alarm/node_modules/graphql/polyfills/arrayFrom.js.flow | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/alarm/node_modules/graphql/polyfills/arrayFrom.js.flow b/alarm/node_modules/graphql/polyfills/arrayFrom.js.flow new file mode 100644 index 0000000..73093b7 --- /dev/null +++ b/alarm/node_modules/graphql/polyfills/arrayFrom.js.flow @@ -0,0 +1,58 @@ +// @flow strict +import { SYMBOL_ITERATOR } from './symbols'; + +declare function arrayFrom<T>(arrayLike: Iterable<T>): Array<T>; +// eslint-disable-next-line no-redeclare +declare function arrayFrom<T: mixed>( + arrayLike: mixed, + mapFn?: (elem: mixed, index: number) => T, + thisArg?: mixed, +): Array<T>; + +/* eslint-disable no-redeclare */ +// $FlowFixMe[name-already-bound] +const arrayFrom = + Array.from || + function (obj, mapFn, thisArg) { + if (obj == null) { + throw new TypeError( + 'Array.from requires an array-like object - not null or undefined', + ); + } + + // Is Iterable? + const iteratorMethod = obj[SYMBOL_ITERATOR]; + if (typeof iteratorMethod === 'function') { + const iterator = iteratorMethod.call(obj); + const result = []; + let step; + + for (let i = 0; !(step = iterator.next()).done; ++i) { + result.push(mapFn.call(thisArg, step.value, i)); + // Infinite Iterators could cause forEach to run forever. + // After a very large number of iterations, produce an error. + // istanbul ignore if (Too big to actually test) + if (i > 9999999) { + throw new TypeError('Near-infinite iteration.'); + } + } + return result; + } + + // Is Array like? + const length = obj.length; + if (typeof length === 'number' && length >= 0 && length % 1 === 0) { + const result = []; + + for (let i = 0; i < length; ++i) { + if (Object.prototype.hasOwnProperty.call(obj, i)) { + result.push(mapFn.call(thisArg, obj[i], i)); + } + } + return result; + } + + return []; + }; + +export default arrayFrom; |