250 new decorator standard (#257)

.github/workflows/build-release.yml

@@ -12,7 +12,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [14.x]
+        node-version: [20.x]
 
     steps:
       - uses: actions/checkout@v2
@@ -31,7 +31,7 @@ jobs:
       - name: Install dependencies
         run: npm install
       - name: Build
-        run: npm run build-nofix
+        run: npm run build
       - name: Run unit tests
         run: npm test
       - name: Create package
@@ -51,7 +51,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [14.x]
+        node-version: [20.x]
 
     steps:
       - name: Download artifact

.github/workflows/build.yml

@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [14.x]
+        node-version: [20.x]
 
     steps:
     - uses: actions/checkout@v2
@@ -35,7 +35,7 @@ jobs:
     - name: npm install, build, and test
       run: |
         npm install
-        npm run build-nofix
+        npm run build
         npm test
       env:
         CI: true

.vscode/ltex.dictionary.en-US.txt

@@ -1,2 +1,3 @@
 VSCode
 accessors
+Liskov

CHANGELOG.md

@@ -4,7 +4,8 @@
 
 * Updated dependencies
 * Updated header year to 2023
-* Project targets ES2022 to utilize the [new language feature](https://devblogs.microsoft.com/typescript/announcing-typescript-5-2/#decorator-metadata)
+* Project targets ES2022 to utilize the [new decorator feature](https://devblogs.microsoft.com/typescript/announcing-typescript-5-2/#decorator-metadata)
+* Updated decorator implementation to track the standard
 * Converted project to utilize ESM
 * Simplified eslint configuration
 * Removed `@override` decorator in favor of [native](https://devblogs.microsoft.com/typescript/announcing-typescript-4-3-beta/#override-and-the-noimplicitoverride-flag) `override` keyword and `@override` [JSDoc tag](https://www.typescriptlang.org/docs/handbook/jsdoc-supported-types.html#override)

README.md

@@ -39,21 +39,29 @@ using this. If you would like an exception to this license per section 7
 
 ## Library Installation
 
-As a dependency run the command:
+The latest version:
 
 `npm install @final-hill/decorator-contracts`
 
-You can also use a specific [version](https://www.npmjs.com/package/@final-hill/decorator-contracts):
+A specific version:
 
-`npm install @final-hill/decorator-contracts@0.24.1`
+`npm install @final-hill/decorator-contracts@x.x.x`
 
-For use in a webpage:
+For use in a browser (no build step) via [unpkg.com](https://unpkg.com/):
 
-`<script src="https://cdn.skypack.dev/@final-hill/decorator-contracts"></script>`
+```html
+<script type="importmap">
+{
+    "imports": {
+        "@final-hill/decorator-contracts": "https://unpkg.com/@final-hill/decorator-contracts"
+    }
+}
+</script>
+```
 
-With a specific [version](https://www.npmjs.com/package/@final-hill/[email protected]):
+Via [skypack.dev](https://www.skypack.dev/):
 
-`<script src="https://cdn.skypack.dev/@final-hill/decorator-contracts@0.24.1"></script>`
+`<script type="module" src="https://cdn.skypack.dev/@final-hill/decorator-contracts"></script>`
 
 ## Usage
 

TODO.md

@@ -1,3 +1,5 @@
+# TODO
+
 Prevent delete
 
 ==========

src/Contracted.mts

@@ -7,7 +7,7 @@
 
 import { ClassRegistration, CLASS_REGISTRY, ClassType, Feature, takeWhile, assertInvariants } from './lib/index.mjs';
 import { assert, checkedMode, Contract, extend } from './index.mjs';
-import { MSG_BAD_SUBCONTRACT, MSG_NO_PROPERTIES, MSG_SINGLE_CONTRACT } from './Messages.mjs';
+import { Messages } from './Messages.mjs';
 
 const isContracted = Symbol('isContracted'),
     innerContract = Symbol('innerContract');
@@ -39,21 +39,24 @@ function hasProperties<U>(registration: ClassRegistration, obj: U): boolean {
 function Contracted<
     T extends Contract<any> = Contract<any>,
     U extends ClassType<any> = ClassType<any>
->(contract: T = new Contract() as T): ClassDecorator {
-    return function (Base: U & { [innerContract]?: Contract<any> }) {
-        assert(!Object.getOwnPropertySymbols(Base).includes(isContracted), MSG_SINGLE_CONTRACT);
+>(contract: T = new Contract() as T) {
+    return function (Clazz: U & { [innerContract]?: Contract<any> }, ctx: ClassDecoratorContext<U>) {
+        if (ctx.kind !== 'class')
+            throw new TypeError(Messages.MsgNotContracted);
+
+        assert(!Object.getOwnPropertySymbols(Clazz).includes(isContracted), Messages.MsgSingleContract);
 
         if (contract[checkedMode] === false)
-            return Base;
+            return Clazz;
 
-        const baseContract = Base[innerContract];
+        const baseContract = Clazz[innerContract];
         assert(
             !baseContract ||
             baseContract && contract[extend] instanceof baseContract.constructor,
-            MSG_BAD_SUBCONTRACT
+            Messages.MsgBadSubcontract
         );
 
-        abstract class InnerContracted extends Base {
+        abstract class InnerContracted extends Clazz {
             // prevents multiple @Contracted decorators from being applied
             static readonly [isContracted] = true;
 
@@ -63,12 +66,12 @@ function Contracted<
                 const Class = this.constructor as ClassType<any>,
                     classRegistration = CLASS_REGISTRY.getOrCreate(Class);
 
-                assert(!hasProperties(classRegistration, this), MSG_NO_PROPERTIES);
+                assert(!hasProperties(classRegistration, this), Messages.MsgNoProperties);
 
                 if (!classRegistration.contractsChecked) {
                     // bottom-up to closest Contracted class bind contracts
-                    const ancRegistrations = takeWhile(classRegistration.ancestry(), (cr => cr.Class !== Base));
-                    [classRegistration, ...ancRegistrations, CLASS_REGISTRY.get(Base)!].forEach(registration => {
+                    const ancRegistrations = takeWhile(classRegistration.ancestry(), (cr => cr.Class !== Clazz));
+                    [classRegistration, ...ancRegistrations, CLASS_REGISTRY.get(Clazz)!].forEach(registration => {
                         registration.bindContract(InnerContracted[innerContract]);
                     });
                 }
@@ -88,10 +91,10 @@ function Contracted<
         const classRegistration = CLASS_REGISTRY.getOrCreate(InnerContracted);
         classRegistration.contractsChecked = false;
 
-        Object.freeze(Base);
+        Object.freeze(Clazz);
 
         return InnerContracted;
-    } as ClassDecorator;
+    };
 }
 
 export { isContracted, innerContract };

src/Messages.mts

@@ -5,12 +5,13 @@
  * @see <https://spdx.org/licenses/AGPL-3.0-only.html>
  */
 
-export const ASSERTION_FAILED = 'Assertion failure';
-export const MSG_NO_STATIC = 'Only instance members can be decorated, not static members';
-export const MSG_NO_PROPERTIES = 'Public properties are forbidden';
-export const MSG_NOT_CONTRACTED = 'The current class or one of its ancestors must declare @Contracted(...)';
-export const MSG_MISSING_FEATURE = 'The requested feature is not registered';
-export const MSG_SINGLE_CONTRACT = 'Only a single @Contracted decorator is allowed per class';
-export const MSG_SINGLE_RETRY = 'retry can only be called once';
-export const MSG_INVALID_CONTEXT = 'A contracted feature can not be applied to objects of a different base class';
-export const MSG_BAD_SUBCONTRACT = 'A sub contract must extend a base contract';
+export enum Messages {
+    AssertionFailed = 'Assertion failure',
+    MsgNoProperties = 'Public properties are forbidden',
+    MsgNotContracted = 'The current class or one of its ancestors must declare @Contracted(...)',
+    MsgMissingFeature = 'The requested feature is not registered',
+    MsgSingleContract = 'Only a single @Contracted decorator is allowed per class',
+    MsgSingleRetry = 'retry can only be called once',
+    MsgInvalidContext = 'A contracted feature can not be applied to objects of a different base class',
+    MsgBadSubcontract = 'A sub contract must extend a base contract'
+}

src/assert.mts

@@ -6,7 +6,7 @@
  */
 
 import AssertionError from './AssertionError.mjs';
-import { ASSERTION_FAILED } from './Messages.mjs';
+import { Messages } from './Messages.mjs';
 import { Constructor } from './index.mjs';
 
 /**
@@ -31,7 +31,7 @@ import { Constructor } from './index.mjs';
  * let name = "Tom"
  * assert(name.trim().length > 0, 'Name is required', TypeError)
  */
-export default function assert(condition: unknown, message = ASSERTION_FAILED, ErrorConstructor: Constructor<Error> = AssertionError): asserts condition {
+export default function assert(condition: unknown, message: string = Messages.AssertionFailed, ErrorConstructor: Constructor<Error> = AssertionError): asserts condition {
     if (Boolean(condition) == false)
         throw new ErrorConstructor(message);
 }

src/lib/ClassRegistration.mts

@@ -5,7 +5,7 @@
  * @see <https://spdx.org/licenses/AGPL-3.0-only.html>
  */
 
-import { MSG_INVALID_CONTEXT, MSG_SINGLE_RETRY } from '../Messages.mjs';
+import { Messages } from '../Messages.mjs';
 import { assert, checkedMode, Contract, innerContract } from '../index.mjs';
 import { assertInvariants, assertDemands, CLASS_REGISTRY, ClassType, Feature, unChecked } from './index.mjs';
 import assertEnsures from './assertEnsures.mjs';
@@ -28,7 +28,7 @@ function checkedFeature(
         const { Class } = registration,
             className = Class.name;
 
-        assert(this instanceof Class, `${MSG_INVALID_CONTEXT}. Expected: this instanceof ${className}. this: ${this.constructor.name}`);
+        assert(this instanceof Class, `${Messages.MsgInvalidContext}. Expected: this instanceof ${className}. this: ${this.constructor.name}`);
 
         const contract = Reflect.get(this, innerContract);
         if (!contract[checkedMode])
@@ -66,7 +66,7 @@ function checkedFeature(
             let hasRetried = false;
             unChecked(contract, () => {
                 rescue.call(this, this, error, [], (...args: any[]) => {
-                    assert(!hasRetried, MSG_SINGLE_RETRY);
+                    assert(!hasRetried, Messages.MsgSingleRetry);
                     hasRetried = true;
                     contract[checkedMode] = true;
                     result = innerCheckedFeature.call(this, ...args);

src/tests/Contract.test.mts

@@ -5,7 +5,7 @@
  * @see <https://spdx.org/licenses/AGPL-3.0-only.html>
  */
 
-import { MSG_BAD_SUBCONTRACT, MSG_SINGLE_CONTRACT } from '../Messages.mjs';
+import { Messages } from '../Messages.mjs';
 import { Contracted, checkedMode, Contract, extend } from '../index.mjs';
 
 interface StackType<T> {
@@ -145,7 +145,7 @@ describe('Only a single contract can be assigned to a class', () => {
             class Foo { }
 
             return new Foo();
-        }).toThrow(MSG_SINGLE_CONTRACT);
+        }).toThrow(Messages.MsgSingleContract);
     });
 });
 
@@ -202,6 +202,6 @@ describe('A subclass can only be contracted by a subcontract of the base class c
             const badContract = new Contract<Bar>({});
             @Contracted(badContract)
             class Bar extends Foo { }
-        }).toThrow(MSG_BAD_SUBCONTRACT);
+        }).toThrow(Messages.MsgBadSubcontract);
     });
 });

src/tests/invariant.test.mts

@@ -6,7 +6,7 @@
  */
 
 import { AssertionError, checkedMode, Contract, Contracted, extend, invariant } from '../index.mjs';
-import { MSG_INVALID_CONTEXT, MSG_NO_PROPERTIES } from '../Messages.mjs';
+import { Messages } from '../Messages.mjs';
 
 // https://github.com/final-hill/decorator-contracts/issues/30
 describe('The subclasses of a contracted class must obey the invariants', () => {
@@ -448,7 +448,7 @@ describe('Public properties must be forbidden', () => {
             }
 
             return new Foo();
-        }).toThrow(MSG_NO_PROPERTIES);
+        }).toThrow(Messages.MsgNoProperties);
     });
 });
 
@@ -773,6 +773,6 @@ describe('Contracted features can only be applied to objects of the same instanc
     test('different instance error', () => {
         expect(() => {
             foo.inc.apply(bar);
-        }).toThrow(MSG_INVALID_CONTEXT);
+        }).toThrow(Messages.MsgInvalidContext);
     });
 });

src/tests/public-properties.test.mts

@@ -5,7 +5,7 @@
  * @see <https://spdx.org/licenses/AGPL-3.0-only.html>
  */
 
-import { MSG_NO_PROPERTIES } from '../Messages.mjs';
+import { Messages } from '../Messages.mjs';
 import { Contracted } from '../index.mjs';
 
 // https://github.com/final-hill/decorator-contracts/issues/35
@@ -34,6 +34,6 @@ describe('Public properties must be forbidden', () => {
             ) { }
         }
 
-        expect(() => new Point2D(12, 5)).toThrow(MSG_NO_PROPERTIES);
+        expect(() => new Point2D(12, 5)).toThrow(Messages.MsgNoProperties);
     });
 });

src/tests/rescue.test.mts

@@ -5,7 +5,7 @@
  * @see <https://spdx.org/licenses/AGPL-3.0-only.html>
  */
 
-import { MSG_SINGLE_RETRY } from '../Messages.mjs';
+import { Messages } from '../Messages.mjs';
 import { checkedMode, Contract, Contracted, invariant } from '../index.mjs';
 
 /**
@@ -305,7 +305,7 @@ describe('The `retry` argument of the `rescue` declaration can only be called on
             }
         }
         const base = new Base();
-        expect(() => base.method(0)).toThrow(MSG_SINGLE_RETRY);
+        expect(() => base.method(0)).toThrow(Messages.MsgSingleRetry);
     });
 });
 

tsconfig.json

@@ -22,7 +22,6 @@
         "noFallthroughCasesInSwitch": true,
         "baseUrl": "./src",
         "allowSyntheticDefaultImports": true,
-        "experimentalDecorators": true,
         "noImplicitOverride": true
     }
 }

webpack.config.mjs

@@ -51,40 +51,7 @@ export default {
       extensions: ['.mts', '.mjs', '.js', '.ts', '.json'],
       exclude: ['node_modules', 'dist', 'coverage'],
       fix: true,
-      overrideConfigFile: path.resolve(dirName, '.eslintrc.json'),
-
-      overrideConfig: {
-        env: {
-          browser: true,
-          node: true,
-          jest: true,
-          es2022: true
-        },
-        extends: [
-          'eslint:recommended',
-          'plugin:@typescript-eslint/eslint-recommended'
-        ],
-        ignorePatterns: [
-          'node_modules',
-          'dist',
-          '.cache',
-          'coverage'
-        ],
-        parser: '@typescript-eslint/parser',
-        parserOptions: {
-          sourceType: 'module',
-          project: [
-            './tsconfig.json'
-          ]
-        },
-        plugins: [
-          '@typescript-eslint',
-          'header'
-        ],
-        rules: {
-
-        }
-      }
+      overrideConfigFile: path.resolve(dirName, '.eslintrc.json')
     })
   ]
 };