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chore(deps): update devdependency expect-type to v0.19.0 #488
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This PR contains the following updates:
0.15.0
->0.19.0
Release Notes
mmkal/expect-type (expect-type)
v0.19.0
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What's Changed
.omit()
to work similarly toOmit
by @aryaemami59 in https://github.com/mmkal/expect-type/pull/54test
import inREADME.md
by @aryaemami59 in https://github.com/mmkal/expect-type/pull/65Full Changelog: mmkal/expect-type@0.18.0...0.19.0
v0.18.0
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What's Changed
.pick
and.omit
by @aryaemami59 in https://github.com/mmkal/expect-type/pull/51New Contributors
Full Changelog: mmkal/expect-type@v0.17.3...0.18.0
v0.17.3
Compare Source
907b8aa
v0.17.2
Compare Source
4b38117
Diff(truncated - scroll right!):
v0.17.1
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.not
and.branded
togethercf38918
(this was actually documented in the v0.17.0 release but really it was only pushed here)
v0.17.0
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#16 went in to - hopefully - significantly improve the error messages produce on failing assertions. Here's an example of how vitest's failing tests were improved:
Before:
After:
Docs copied from the readme about how to interpret these error messages
Error messages
When types don't match,
.toEqualTypeOf
and.toMatchTypeOf
use a special helper type to produce error messages that are as actionable as possible. But there's a bit of an nuance to understanding them. Since the assertions are written "fluently", the failure should be on the "expected" type, not the "actual" type (expect<Actual>().toEqualTypeOf<Expected>()
). This means that type errors can be a little confusing - so this library produces aMismatchInfo
type to try to make explicit what the expectation is. For example:Is an assertion that will fail, since
{a: 1}
has type{a: number}
and not{a: string}
. The error message in this case will read something like this:Note that the type constraint reported is a human-readable messaging specifying both the "expected" and "actual" types. Rather than taking the sentence
Types of property 'a' are incompatible // Type 'string' is not assignable to type "Expected: string, Actual: number"
literally - just look at the property name ('a'
) and the message:Expected: string, Actual: number
. This will tell you what's wrong, in most cases. Extremely complex types will of course be more effort to debug, and may require some experimentation. Please raise an issue if the error messages are actually misleading.The
toBe...
methods (liketoBeString
,toBeNumber
,toBeVoid
etc.) fail by resolving to a non-callable type when theActual
type under test doesn't match up. For example, the failure for an assertion likeexpectTypeOf(1).toBeString()
will look something like this:The
This expression is not callable
part isn't all that helpful - the meaningful error is the next line,Type 'ExpectString<number> has no call signatures
. This essentially means you passed a number but asserted it should be a string.If TypeScript added support for "throw" types these error messagess could be improved. Until then they will take a certain amount of squinting.
Concrete "expected" objects vs typeargs
Error messages for an assertion like this:
Will be less helpful than for an assertion like this:
This is because the TypeScript compiler needs to infer the typearg for the
.toEqualTypeOf({a: ''})
style, and this library can only mark it as a failure by comparing it against a genericMismatch
type. So, where possible, use a typearg rather than a concrete type for.toEqualTypeOf
andtoMatchTypeOf
. If it's much more convenient to compare two concrete types, you can usetypeof
:Kinda-breaking changes: essentially none, but technically,
.branded
no longer returns a "full"ExpectTypeOf
instance at compile-time. Previously you could do this:Now that won't work (and it was always slightly nonsensical), so you'd have to use
// @​ts-expect-error
instead ofnot
if you have a negated case where you needbranded
:What's Changed
New Contributors
Full Changelog: mmkal/expect-type@v0.16.0...v0.17.0
v0.16.0
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What's Changed
this
parameters by @mmkal and @papb in https://github.com/mmkal/expect-type/pull/15Equal
to use the equality check fromReadonlyEquivalent
exclusively by @trevorade in https://github.com/mmkal/expect-type/pull/21Note that #21 has affected behavior for intersection types, which can result in (arguably) false errors:
Full Changelog: mmkal/expect-type@v0.15.0...v16.0.0
Configuration
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🚦 Automerge: Enabled.
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🔕 Ignore: Close this PR and you won't be reminded about this update again.
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