38 lines
1.3 KiB
JavaScript
38 lines
1.3 KiB
JavaScript
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export function isPromiseMethod(x) {
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if (x === "then" || x === "catch" || x === "finally") {
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return true;
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}
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return false;
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}
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export function isKVMap(x) {
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if (typeof x !== "object" || x == null) {
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return false;
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}
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const prototype = Object.getPrototypeOf(x);
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return ((prototype === null ||
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prototype === Object.prototype ||
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Object.getPrototypeOf(prototype) === null) &&
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!(Symbol.toStringTag in x) &&
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!(Symbol.iterator in x));
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}
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export const isAsyncIterable = (x) => x != null &&
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typeof x === "object" &&
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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typeof x[Symbol.asyncIterator] === "function";
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export const isIteratorLike = (x) => x != null &&
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typeof x === "object" &&
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"next" in x &&
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typeof x.next === "function";
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const GeneratorFunction = function* () { }.constructor;
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export const isGenerator = (x) =>
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// eslint-disable-next-line no-instanceof/no-instanceof
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x != null && typeof x === "function" && x instanceof GeneratorFunction;
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export const isThenable = (x) => x != null &&
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typeof x === "object" &&
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"then" in x &&
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typeof x.then === "function";
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export const isReadableStream = (x) => x != null &&
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typeof x === "object" &&
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"getReader" in x &&
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typeof x.getReader === "function";
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