If async function doesn't have await stmt, hasPendingJob return false throw Error

How to catch error in async function? about quickjs-emscripten HOT 1 CLOSED

justjake commented on May 30, 2024

How to catch error in async function?

from quickjs-emscripten.

Comments (1)

justjake commented on May 30, 2024

The result of executing an async function inside the VM is always a QuickJSHandle containing a Promise value. You can convert the promise value to a native promise using QuickJSContext.resolvePromise as demonstrated in this test:

quickjs-emscripten/ts/quickjs.test.ts

Lines 762 to 787 in 75fcb3f

 it("retrieves async function error as a error VM result", async () => { 

 const result = vm.unwrapResult( 

 vm.evalCode(` 

  async function throwOops() { 

  throw new Error('oops') 

  } 

  throwOops() 

  `) 

 ) 

 assert.equal(vm.typeof(result), "object", "Async function returns an object (promise)") 

 const promise = result.consume((result) => vm.resolvePromise(result)) 

 vm.runtime.executePendingJobs() 

 const asyncResult = await promise 

 if (!asyncResult.error) { 

 throw new Error("Should have returned an error") 

 } 

 const error = vm.dump(asyncResult.error) 

 asyncResult.error.dispose() 

 assert.equal(error.name, "Error") 

 assert.equal(error.message, "oops") 

 })

from quickjs-emscripten.

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How to catch error in async function? about quickjs-emscripten HOT 1 CLOSED

Comments (1)

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	it("retrieves async function error as a error VM result", async () => {
	const result = vm.unwrapResult(
	vm.evalCode(`
	async function throwOops() {
	throw new Error('oops')
	}

	throwOops()
	`)
	)

	assert.equal(vm.typeof(result), "object", "Async function returns an object (promise)")

	const promise = result.consume((result) => vm.resolvePromise(result))
	vm.runtime.executePendingJobs()
	const asyncResult = await promise

	if (!asyncResult.error) {
	throw new Error("Should have returned an error")
	}
	const error = vm.dump(asyncResult.error)
	asyncResult.error.dispose()

	assert.equal(error.name, "Error")
	assert.equal(error.message, "oops")
	})