fix: toGenerator should not expand array

Author: antfu

src/index.ts

@@ -8,11 +8,8 @@ const ERROR_PROMISE_IN_SYNC = '[Quansync] Yielded an unexpected promise in sync
 function isThenable<T>(value: any): value is Promise<T> {
   return value && typeof value === 'object' && typeof value.then === 'function'
 }
-function isGenerator<T>(value: any): value is Generator<T> {
-  return value && typeof value === 'object' && typeof value[Symbol.iterator] === 'function'
-}
 function isQuansyncGenerator<T>(value: any): value is QuansyncGenerator<T> {
-  return isGenerator(value) && '__quansync' in value
+  return value && typeof value === 'object' && typeof value[Symbol.iterator] === 'function' && '__quansync' in value
 }
 
 function fromObject<Return, Args extends any[]>(
@@ -114,7 +111,7 @@ export function quansync<Return, Args extends any[] = []>(
  * Converts a promise to a Quansync generator.
  */
 export function toGenerator<T>(promise: Promise<T> | QuansyncGenerator<T> | T): QuansyncGenerator<T> {
-  if (isGenerator(promise))
+  if (isQuansyncGenerator(promise))
     return promise
   return fromPromise(promise)()
 }

test/index.test.ts

@@ -193,6 +193,18 @@ it('yield generator', async () => {
   await expect(multiply.async()).resolves.toBe('strstr')
 })
 
+it('yield toGenerator array', async () => {
+  const run = quansync(function* () {
+    const input = ['1', 2, 3]
+    const result = yield* toGenerator(input)
+    expect(result).toBe(input)
+    return result
+  })
+
+  expect(run.sync()).toEqual(['1', 2, 3])
+  await expect(run.async()).resolves.toEqual(['1', 2, 3])
+})
+
 it('handles tail call', async () => {
   const echo = quansync({
     sync: (v: string) => v,