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jsii: Compiler allows class-inherited member to violate interface #3342

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RomainMuller opened this issue Jan 17, 2022 · 1 comment 路 Fixed by #3343
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jsii: Compiler allows class-inherited member to violate interface #3342

RomainMuller opened this issue Jan 17, 2022 · 1 comment 路 Fixed by #3343
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bug This issue is a bug. p1

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@RomainMuller
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馃悰 Bug Report

What is the problem?

The compiler does not check members inherited from a base class against the type's declared interfaces, and consequently allows the contract of said interface to be violated.

export interface IApplicationLoadBalancer {
  readonly vpc?: ec2.IVpc;
}


export class BaseLoadBalancer {
  readonly vpc: ec2.Vpc;
}

export class ApplicationLoadBalancer
  extends BaseLoadBalancer
  implements IApplicationLoadBalancer {
  // Inherits `vpc` from BaseLoadBalancer, but that is not optional,
  // when `IApplicationLoadBalancer` requires it to be optional.
}
@RomainMuller RomainMuller added bug This issue is a bug. p1 labels Jan 17, 2022
@RomainMuller RomainMuller self-assigned this Jan 17, 2022
RomainMuller pushed a commit to aws/aws-cdk that referenced this issue Jan 17, 2022
fix(elbv2): BaseLoadBalancer.vpc is not optional
f5a1bd6 
The `BaseLoadBalancer.vpc` property fulfills the `IApplicationLoadBalancer.vpc` and
`INetworkLoadBalancer.vpc` properties, both of which are optional. A bug in `jsii` (see aws/jsii#3342)
makes this pass type system consistency checks, when it should not be allowed.
@RomainMuller RomainMuller mentioned this issue Jan 17, 2022
Merged
mergify bot pushed a commit to aws/aws-cdk that referenced this issue Jan 18, 2022
fix(elbv2): BaseLoadBalancer.vpc is not optional (#18474)
f511c17 
The `BaseLoadBalancer.vpc` property fulfills the `IApplicationLoadBalancer.vpc` and
`INetworkLoadBalancer.vpc` properties, both of which are optional. A bug in `jsii` (see aws/jsii#3342)
makes this pass type system consistency checks, when it should not be allowed.


----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*
@RomainMuller RomainMuller mentioned this issue Jan 18, 2022
Merged
@mergify mergify bot closed this as completed in #3343 Jan 18, 2022
mergify bot pushed a commit that referenced this issue Jan 18, 2022
fix(jsii): compiler allows inheriting interface-violating members (#3343
b5037b9 
)

The compiler failed to check inherited members from a base class against
interfaces declared on the inheriting class, so that it was possible to
inherit members that changed the signature of the interface declarations
they implemented (typically specializing them: required implementations
of optional properties, etc...).

While this is valid TypeScript (the implementation is allowed to be
strictly more specific than the interface declaration), this is not
allowed by jsii as this results in type models that cannot be
represented in C# (and other languages that do not allow specialization
by implementing or overriding members).

In addition to fixing this issue, this change adds source bindings to
diagnostics generated when property implementations are rejected, and
fixes a logical error in the message for `JSII5010` (`immutable` and
`mutable` were reversed so the message read the wrong way around).

Fixes #3342 

---

By submitting this pull request, I confirm that my contribution is made under the terms of the [Apache 2.0 license].

[Apache 2.0 license]: https://www.apache.org/licenses/LICENSE-2.0
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@andskli andskli mentioned this issue Jan 28, 2022
Merged
TikiTDO pushed a commit to TikiTDO/aws-cdk that referenced this issue Feb 21, 2022
@TikiTDO
fix(elbv2): BaseLoadBalancer.vpc is not optional (aws#18474)
40896ee 
The `BaseLoadBalancer.vpc` property fulfills the `IApplicationLoadBalancer.vpc` and
`INetworkLoadBalancer.vpc` properties, both of which are optional. A bug in `jsii` (see aws/jsii#3342)
makes this pass type system consistency checks, when it should not be allowed.


----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*
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fix(jsii): compiler allows inheriting interface-violating members aws/jsii
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