add hw2

node_modules/quansync/dist/index.mjs

@@ -0,0 +1,102 @@
+const GET_IS_ASYNC = Symbol.for("quansync.getIsAsync");
+class QuansyncError extends Error {
+  constructor(message = "Unexpected promise in sync context") {
+    super(message);
+    this.name = "QuansyncError";
+  }
+}
+function isThenable(value) {
+  return value && typeof value === "object" && typeof value.then === "function";
+}
+function isQuansyncGenerator(value) {
+  return value && typeof value === "object" && typeof value[Symbol.iterator] === "function" && "__quansync" in value;
+}
+function fromObject(options) {
+  const generator = function* (...args) {
+    const isAsync = yield GET_IS_ASYNC;
+    if (isAsync)
+      return yield options.async.apply(this, args);
+    return options.sync.apply(this, args);
+  };
+  function fn(...args) {
+    const iter = generator.apply(this, args);
+    iter.then = (...thenArgs) => options.async.apply(this, args).then(...thenArgs);
+    iter.__quansync = true;
+    return iter;
+  }
+  fn.sync = options.sync;
+  fn.async = options.async;
+  return fn;
+}
+function fromPromise(promise) {
+  return fromObject({
+    async: () => Promise.resolve(promise),
+    sync: () => {
+      if (isThenable(promise))
+        throw new QuansyncError();
+      return promise;
+    }
+  });
+}
+function unwrapYield(value, isAsync) {
+  if (value === GET_IS_ASYNC)
+    return isAsync;
+  if (isQuansyncGenerator(value))
+    return isAsync ? iterateAsync(value) : iterateSync(value);
+  if (!isAsync && isThenable(value))
+    throw new QuansyncError();
+  return value;
+}
+const DEFAULT_ON_YIELD = (value) => value;
+function iterateSync(generator, onYield = DEFAULT_ON_YIELD) {
+  let current = generator.next();
+  while (!current.done) {
+    try {
+      current = generator.next(unwrapYield(onYield(current.value, false)));
+    } catch (err) {
+      current = generator.throw(err);
+    }
+  }
+  return unwrapYield(current.value);
+}
+async function iterateAsync(generator, onYield = DEFAULT_ON_YIELD) {
+  let current = generator.next();
+  while (!current.done) {
+    try {
+      current = generator.next(await unwrapYield(onYield(current.value, true), true));
+    } catch (err) {
+      current = generator.throw(err);
+    }
+  }
+  return current.value;
+}
+function fromGeneratorFn(generatorFn, options) {
+  return fromObject({
+    name: generatorFn.name,
+    async(...args) {
+      return iterateAsync(generatorFn.apply(this, args), options?.onYield);
+    },
+    sync(...args) {
+      return iterateSync(generatorFn.apply(this, args), options?.onYield);
+    }
+  });
+}
+function quansync(input, options) {
+  if (isThenable(input))
+    return fromPromise(input);
+  if (typeof input === "function")
+    return fromGeneratorFn(input, options);
+  else
+    return fromObject(input);
+}
+function toGenerator(promise) {
+  if (isQuansyncGenerator(promise))
+    return promise;
+  return fromPromise(promise)();
+}
+const getIsAsync = quansync({
+  async: () => Promise.resolve(true),
+  sync: () => false
+});
+
+export { GET_IS_ASYNC, QuansyncError, getIsAsync, quansync, toGenerator };