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Azure Core: Enable no-enum rule by default in all ruleset #467

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Mar 22, 2024
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8 changes: 8 additions & 0 deletions .chronus/changes/enable-no-enum-rule-2024-2-21-16-42-36.md
Original file line number Diff line number Diff line change
@@ -0,0 +1,8 @@
---
# Change versionKind to one of: internal, fix, dependencies, feature, deprecation, breaking
changeKind: feature
packages:
- "@azure-tools/typespec-azure-core"
---

Enable `no-enum` rule by default in `all` ruleset
2 changes: 1 addition & 1 deletion packages/typespec-azure-core/src/linter.ts
Original file line number Diff line number Diff line change
Expand Up @@ -110,7 +110,7 @@ export const $linter = defineLinter({
true,
[`@azure-tools/typespec-azure-core/${useStandardNames.name}`]: true,
[`@azure-tools/typespec-azure-core/${friendlyNameRule.name}`]: true,
[`@azure-tools/typespec-azure-core/${noEnumRule.name}`]: false,
[`@azure-tools/typespec-azure-core/${noEnumRule.name}`]: true,
},
extends: ["@typespec/http/all"],
},
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4 changes: 3 additions & 1 deletion packages/typespec-azure-core/src/rules/no-enum.ts
Original file line number Diff line number Diff line change
Expand Up @@ -23,9 +23,11 @@ export const noEnumRule = createRule({
create(context) {
return {
enum: (en: Enum) => {
if (getVersionsForEnum(context.program, en).length > 0) {
const [_, versions] = getVersionsForEnum(context.program, en);
if (versions !== undefined && versions.getVersions()[0].enumMember.enum === en) {
return;
}

context.reportDiagnostic({
format: { enumName: en.name },
target: en,
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22 changes: 22 additions & 0 deletions packages/typespec-azure-core/test/rules/no-enum.test.ts
Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,7 @@ describe("typespec-azure-core: no-enum rule", () => {
},
]);
});

it("allows the version enum", async () => {
await tester
.expect(
Expand All @@ -46,6 +47,27 @@ describe("typespec-azure-core: no-enum rule", () => {
.toBeValid();
});

it("emit warning about other enums in versioned service", async () => {
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@MaryGao MaryGao Mar 25, 2024

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I am wondering why we have this warning in azure scope?

Looking at the swagger, there are a lot of cases where "modelAsString": false in enum extensible and I think they would be taken as fixed.
https://github.com/Azure/azure-rest-api-specs/blob/feature/health-lro/specification/compute/resource-manager/Microsoft.Compute/CloudserviceRP/preview/2020-10-01-preview/cloudService.json#L1483-L1492

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Being an azure scope is the entire point of this linting rule. Actual enums cannot deal with new values being added so azure policy is you shouldn’t use them. There is of course always exceptions.

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Yes

await tester
.expect(
`
@service
@versioned(Versions)
namespace Foo;
enum Versions {
v1, v2
}

enum Bar { a, b}
`
)
.toEmitDiagnostics([
{
code: "@azure-tools/typespec-azure-core/no-enum",
},
]);
});

describe("codefix", () => {
it("codefix simple enum", async () => {
await tester
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