errors: extract type detection & use in `ERR_INVALID_RETURN_VALUE` #43558

JakobJingleheimer · 2022-06-24T10:16:18Z

Address issues in error messaging like when value is null (error message previously says something to the effect of expected an object […] but got an object).

BridgeAR

LGTM

Is there no test that requires an update?

aduh95

LGTM. We tend not to test for error messages because we want to be able to change them in semver-patch commits, it’s not surprising that there are no tests to update.

nodejs-github-bot · 2022-06-24T11:31:50Z

CI: https://ci.nodejs.org/job/node-test-pull-request/44830/

JakobJingleheimer · 2022-06-24T13:41:47Z

We tend not to test for error messages because we want to be able to change them in semver-patch commits

Comparison {
5044
    code: 'ERR_INVALID_RETURN_VALUE',
5045
+   message: 'Expected instance of Promise to be returned from the "promiseFn" function but got undefined.',
5046
-   message: 'Expected instance of Promise to be returned from the "promiseFn" function but got type undefined.',
5047
    name: 'TypeError'
5048
  }

What were you saying @aduh95? 😆 I'll update that test tomorrow.

test/parallel/test-assert-async.js

test/errors/test-error-value-type-detection.mjs

aduh95 · 2022-06-26T10:56:18Z

test/errors/test-error-value-type-detection.mjs

+  determineSpecificType(Object.create(null)),
+  'an instance of Object',


Well that's just untrue x) Object.create(null) instanceof Object === false

Technically untrue, yes, but I think being helpful and a tiny bit wrong is better.

I had originally put 'an instance of Object (null Prototype)', but decided that was TMI; if I put that in, would it address your concern? (Or perhaps 'type object (null Prototype)' or any other similar flavour)

Otherwise you end up with a error message like Expected an instance of Map, but instead got [Object: null prototype] {} (which looks ugly and kind of confusing)

Technically untrue, yes, but I think being helpful and a tiny bit wrong is better.

I very much disagree here, I feel quite strongly that error messages must always be technically correct first, to me I believe one can't be helpful if they are misleading.

I think it should not be special cased, type object ([Object: null prototype] {}) is good enough to me. What is it that you don't like about it exactly?

What is it that you don't like about it exactly?

It looks bizarre before your suggested change below—it didn't have type (I think it's better now with your suggestion), it was just got [Object: null prototype] {}); type object (null Prototype) seems more human-friendly to me, and similar to other type outputs (ex type number (2)), but I can live with type object ([Object: null prototype] ...).

Note that the actual output with your suggestion below is type object ([Object: null prototype] ...)

I definitely prefer the former output: limiting the string was only done for primitives and functions. Objects have not been inspected closer and just the most outer layer was inspected. That's not the case anymore and would possibly hide important information. The reason not to add type object is that it should be obvious that it's an object as everything is that's not a primitive (or function). It was therefore a way to limit the output to the necessary information.

Please change that back.

lib/internal/errors.js

…LUE` `new Array(0)` et al → new Array(); tag self in FIXME

test/parallel/test-assert-async.js

lib/internal/errors.js

…TURN_VALUE` type object (…)

…ALID_RETURN_VALUE` de-lint

JakobJingleheimer · 2022-06-26T15:34:19Z

@aduh95 @BridgeAR looks like there's a test helper in common that duplicates the functionality of the new determineSpecificType().

node/test/common/index.js

Lines 732 to 749 in 42ad967

    
           function invalidArgTypeHelper(input) { 
        
             if (input == null) { 
        
               return ` Received ${input}`; 
        
             } 
        
             if (typeof input === 'function' && input.name) { 
        
               return ` Received function ${input.name}`; 
        
             } 
        
             if (typeof input === 'object') { 
        
               if (input.constructor && input.constructor.name) { 
        
                 return ` Received an instance of ${input.constructor.name}`; 
        
               } 
        
               return ` Received ${inspect(input, { depth: -1 })}`; 
        
             } 
        
             let inspected = inspect(input, { colors: false }); 
        
             if (inspected.length > 25) 
        
               inspected = `${inspected.slice(0, 25)}...`; 
        
             return ` Received type ${typeof input} (${inspected})`; 
        
           }

I think it should be de-duplicated. Would it be okay to import the new helper into test/common and re-export it?

aduh95 · 2022-06-26T16:15:14Z

I think it should be de-duplicated. Would it be okay to import the new helper into test/common and re-export it?

What about removing it? If we have tests for determineSpecificType, we probably don't need it at all, from what I can see it's only used to validate exact error messages, which we don't need to do.

JakobJingleheimer · 2022-06-26T17:14:44Z

What about removing it? If we have tests for determineSpecificType, we probably don't need it at all, from what I can see it's only used to validate exact error messages, which we don't need to do.

I think that's right thing to do in the end, but it's used in 104 places, most of which are using things like assert.throws that strict equals error.message under the hood. This would be a fairly significant refactor (and I presume we can't change assert.throws, asserts.rejects, etc), and we would basically have to stop using those assertions.

aduh95 · 2022-06-26T19:19:04Z

What about removing it? If we have tests for determineSpecificType, we probably don't need it at all, from what I can see it's only used to validate exact error messages, which we don't need to do.

I think that's right thing to do in the end, but it's used in 104 places, most of which are using things like assert.throws that strict equals error.message under the hood. This would be a fairly significant refactor (and I presume we can't change assert.throws, asserts.rejects, etc), and we would basically have to stop using those assertions.

I agree it’s not something to do in this PR, so I guess my stance on it is we should leave it as is for now.
FWIW assert.throws supports using regex to check for a pattern rather than an exact string equality (e.g. assert.throws(()=>{throw new Error("this is a test")},{message:/test$/})).

JakobJingleheimer · 2022-06-26T19:25:55Z

Oow! That's good to know, but I think that isn't sufficient because it would do only 1 match, and there are multiple key words that need to match (the type it should've been and the type it received).

I might have to update a whole lotta tests' message checks—test parallel is drip-feeding me the failures.

BridgeAR · 2022-06-26T20:37:32Z

I suggest to keep everything as is. The point to test internal error messages even for concrete errors is actually useful in a couple of cases where it's possible to pass through individual error message content. Yes, it's possible to use a regexp and that would mostly suffice while it would not always detect all issues. We do not have a downside by keeping it as is, so why do that?

JakobJingleheimer · 2022-06-26T22:20:51Z

There is a downside to keeping it as is: it makes the tests rigid and brittle, and creates make-work for inconsequential changes. The error messages are the same aside from the keys words that matter and can change, so checking for those are all the actual matters downstream (especially when upstream tests already guarantee that they're the same).

nodejs-github-bot · 2022-07-01T07:07:35Z

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- Loading data for nodejs/node/pull/43558
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----------------------------------- PR info ------------------------------------
Title      errors: extract type detection & use in `ERR_INVALID_RETURN_VALUE` (#43558)
   ⚠  Could not retrieve the email or name of the PR author's from user's GitHub profile!
Branch     JakobJingleheimer:errors/account-for-specific-types-in-return-value -> nodejs:main
Labels     errors, needs-ci, commit-queue-squash
Commits    5
 - errors: extract type detection & use in `ERR_INVALID_RETURN_VALUE`
 - fixup! errors: extract type detection & use in `ERR_INVALID_RETURN_VA…
 - fixup! fixup! errors: extract type detection & use in `ERR_INVALID_RE…
 - fixup! fixup! fixup! errors: extract type detection & use in `ERR_INV…
 - fixup! fixup! fixup! fixup! errors: extract type detection & use in `…
Committers 1
 - Jacob Smith <[email protected]>
PR-URL: https://github.com/nodejs/node/pull/43558
Reviewed-By: Ruben Bridgewater 
Reviewed-By: Antoine du Hamel 
Reviewed-By: James M Snell 
------------------------------ Generated metadata ------------------------------
PR-URL: https://github.com/nodejs/node/pull/43558
Reviewed-By: Ruben Bridgewater 
Reviewed-By: Antoine du Hamel 
Reviewed-By: James M Snell 
--------------------------------------------------------------------------------
   ⚠  Commits were pushed since the last review:
   ⚠  - fixup! fixup! fixup! fixup! errors: extract type detection & use in `…
   ℹ  This PR was created on Fri, 24 Jun 2022 10:16:18 GMT
   ✔  Approvals: 3
   ✔  - Ruben Bridgewater (@BridgeAR) (TSC): https://github.com/nodejs/node/pull/43558#pullrequestreview-1018314632
   ✔  - Antoine du Hamel (@aduh95) (TSC): https://github.com/nodejs/node/pull/43558#pullrequestreview-1018326931
   ✔  - James M Snell (@jasnell) (TSC): https://github.com/nodejs/node/pull/43558#pullrequestreview-1020506108
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   ⚠  - errors: extract type detection & use in `ERR_INVALID_RETURN_VALUE`
   ⚠  - fixup! errors: extract type detection & use in `ERR_INVALID_RETURN_VA…
   ⚠  - fixup! fixup! errors: extract type detection & use in `ERR_INVALID_RE…
   ⚠  - fixup! fixup! fixup! errors: extract type detection & use in `ERR_INV…
   ⚠  - fixup! fixup! fixup! fixup! errors: extract type detection & use in `…
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BridgeAR

Please do not change the message for objects without constructor (name).

aduh95 · 2022-07-01T12:21:14Z

@BridgeAR can you clarify why? Is it because you worry it might be too breaking or because you think the new message is worse?

BridgeAR · 2022-07-01T12:22:08Z

@aduh95 the latter.

JakobJingleheimer · 2022-07-01T12:39:33Z

@BridgeAR sorry! I didn't mean to sneak something through. Antoine was online, so I DM'd him to ask how to unblock this PR (which is blocking an esm bugfix), and it seemed I had misunderstood your objection (but apparently not).

I mentioned your opposition a few times in the above comments, and the dialogue spanned a couple days without you chiming in (and you had approved and didn't change it), so I thought I'd misinterpreted your comments.

I'll revert the change to objects without a constructor name.

…se in `ERR_INVALID_RETURN_VALUE` revert type determination output for objects without a constructor

BridgeAR

Thanks!

BridgeAR · 2022-07-01T13:12:49Z

test/common/index.js

@@ -737,14 +737,15 @@ function invalidArgTypeHelper(input) {
    return ` Received function ${input.name}`;
  }
  if (typeof input === 'object') {
-    if (input.constructor && input.constructor.name) {
+    if (input?.constructor?.name) {


Suggested change

if (input?.constructor?.name) {

if (input.constructor?.name) {

We know for certain that input is an object of some kind (null is already checked above).

BridgeAR · 2022-07-01T13:13:52Z

lib/internal/errors.js

+    return `function ${value.name}`;
+  }
+  if (typeof value === 'object') {
+    if (value?.constructor?.name) {


Suggested change

if (value?.constructor?.name) {

if (value.constructor?.name) {

…ion & use in `ERR_INVALID_RETURN_VALUE` remove superfluous optional property access on constructor

JakobJingleheimer · 2022-07-01T16:46:51Z

@aduh95 or @BridgeAR could one of you approve again? I added Ruben's suggested tweak after he just approved, so I think the commit queue will reject.

nodejs-github-bot · 2022-07-01T16:58:22Z

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- Loading data for nodejs/node/pull/43558
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----------------------------------- PR info ------------------------------------
Title      errors: extract type detection & use in `ERR_INVALID_RETURN_VALUE` (#43558)
   ⚠  Could not retrieve the email or name of the PR author's from user's GitHub profile!
Branch     JakobJingleheimer:errors/account-for-specific-types-in-return-value -> nodejs:main
Labels     errors, needs-ci, commit-queue-squash
Commits    7
 - errors: extract type detection & use in `ERR_INVALID_RETURN_VALUE`
 - fixup! errors: extract type detection & use in `ERR_INVALID_RETURN_VA…
 - fixup! fixup! errors: extract type detection & use in `ERR_INVALID_RE…
 - fixup! fixup! fixup! errors: extract type detection & use in `ERR_INV…
 - fixup! fixup! fixup! fixup! errors: extract type detection & use in `…
 - fixup! fixup! fixup! fixup! fixup! errors: extract type detection & u…
 - fixup! fixup! fixup! fixup! fixup! fixup! errors: extract type detect…
Committers 1
 - Jacob Smith <[email protected]>
PR-URL: https://github.com/nodejs/node/pull/43558
Reviewed-By: Ruben Bridgewater 
Reviewed-By: Antoine du Hamel 
Reviewed-By: James M Snell 
------------------------------ Generated metadata ------------------------------
PR-URL: https://github.com/nodejs/node/pull/43558
Reviewed-By: Ruben Bridgewater 
Reviewed-By: Antoine du Hamel 
Reviewed-By: James M Snell 
--------------------------------------------------------------------------------
   ⚠  Commits were pushed since the last review:
   ⚠  - fixup! fixup! fixup! fixup! fixup! fixup! errors: extract type detect…
   ℹ  This PR was created on Fri, 24 Jun 2022 10:16:18 GMT
   ✔  Approvals: 3
   ✔  - Ruben Bridgewater (@BridgeAR) (TSC): https://github.com/nodejs/node/pull/43558#pullrequestreview-1026202846
   ✔  - Antoine du Hamel (@aduh95) (TSC): https://github.com/nodejs/node/pull/43558#pullrequestreview-1018326931
   ✔  - James M Snell (@jasnell) (TSC): https://github.com/nodejs/node/pull/43558#pullrequestreview-1020506108
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   ⚠  - fixup! fixup! fixup! fixup! fixup! errors: extract type detection & u…
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nodejs-github-bot · 2022-07-01T18:08:10Z

Landed in 5a18304

PR-URL: #43558 Reviewed-By: Ruben Bridgewater <[email protected]> Reviewed-By: Antoine du Hamel <[email protected]> Reviewed-By: James M Snell <[email protected]>

PR-URL: nodejs/node#43558 Reviewed-By: Ruben Bridgewater <[email protected]> Reviewed-By: Antoine du Hamel <[email protected]> Reviewed-By: James M Snell <[email protected]>

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fixup! fixup! errors: extract type detection & use in `ERR_INVALID_RE…

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		determineSpecificType(Object.create(null)),
		'an instance of Object',

	if (input?.constructor?.name) {
	if (input.constructor?.name) {

	if (value?.constructor?.name) {
	if (value.constructor?.name) {

errors: extract type detection & use in ERR_INVALID_RETURN_VALUE #43558

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