Test

crates/swc_ecma_transforms_proposal/scripts/split-decorator-tests.mjs

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+import typescript from 'typescript'
+import fs from 'fs'
+import module from 'module'
+
+const require = module.createRequire(import.meta.url)
+const ts = fs.readFileSync('./tests/decorator-tests/decorator-tests.ts', 'utf8')
+
+// Convert TypeScript to JavaScript for testing JavaScript VMs
+console.log('Converting TypeScript to JavaScript...')
+
+const program = typescript.createProgram({
+    rootNames: ['./tests/decorator-tests/decorator-tests.ts'],
+    options: { target: typescript.ScriptTarget.ESNext }
+});
+// console.log('program', program)
+const mainFile = program.getSourceFile('./tests/decorator-tests/decorator-tests.ts')
+// console.log('mainFile', mainFile)
+
+const testVarStmt = mainFile.statements.find((s) => s.kind === typescript.SyntaxKind.VariableStatement)
+// console.log('testVarStmt', testVarStmt)
+
+const testVarDecl = testVarStmt.declarationList.declarations[0]
+// console.log('testVarDecl', testVarDecl)
+
+const properties = testVarDecl.initializer.properties
+// console.log('properties', properties)
+
+fs.mkdirSync(`tests/decorator-evanw-split`, { recursive: true });
+
+for (const property of properties) {
+    let name = property.name.getText(mainFile)
+    const value = property.initializer.getText(mainFile)
+
+    name = name.replace(/'/g, '')
+
+    // console.log('name', name)
+    // console.log('value', value)
+
+    const code = `(${value})()`;
+    const transpiiled = typescript.transpile(code, { target: typescript.ScriptTarget.ESNext })
+
+    fs.writeFileSync(`tests/decorator-evanw-split/${name}.js`, transpiiled)
+}
+

crates/swc_ecma_transforms_proposal/tests/decorator-evanw-split/Auto-accessor decorators: Basic (instance auto-accessor).js

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+(() => {
+    const dec = (key, getName, setName) => (target, ctx) => {
+        assertEq(() => typeof target.get, 'function');
+        assertEq(() => typeof target.set, 'function');
+        assertEq(() => target.get.name, getName);
+        assertEq(() => target.set.name, setName);
+        assertEq(() => ctx.kind, 'accessor');
+        assertEq(() => ctx.name, key);
+        assertEq(() => ctx.static, false);
+        assertEq(() => ctx.private, false);
+        assertEq(() => ctx.access.has({ [key]: false }), true);
+        assertEq(() => ctx.access.has({ bar: true }), false);
+        assertEq(() => ctx.access.get({ [key]: 123 }), 123);
+        assertEq(() => {
+            const obj = {};
+            ctx.access.set(obj, 123);
+            return obj[key];
+        }, 123);
+    };
+    const bar = Symbol('bar');
+    const baz = Symbol();
+    class Foo {
+        @dec('foo', 'get foo', 'set foo')
+        accessor foo = 0;
+        @dec(bar, 'get [bar]', 'set [bar]')
+        accessor [bar] = 0;
+        @dec(baz, 'get ', 'set ')
+        accessor [baz] = 0;
+    }
+    var obj = new Foo;
+    obj.foo = 321;
+    assertEq(() => obj.foo, 321);
+    obj[bar] = 4321;
+    assertEq(() => obj[bar], 4321);
+    obj[baz] = 54321;
+    assertEq(() => obj[baz], 54321);
+})();

crates/swc_ecma_transforms_proposal/tests/decorator-evanw-split/Auto-accessor decorators: Basic (private instance auto-accessor).js

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+(() => {
+    let lateAsserts;
+    const dec = (target, ctx) => {
+        assertEq(() => typeof target.get, 'function');
+        assertEq(() => typeof target.set, 'function');
+        assertEq(() => target.get.name, 'get #foo');
+        assertEq(() => target.set.name, 'set #foo');
+        assertEq(() => ctx.kind, 'accessor');
+        assertEq(() => ctx.name, '#foo');
+        assertEq(() => ctx.static, false);
+        assertEq(() => ctx.private, true);
+        lateAsserts = () => {
+            assertEq(() => ctx.access.has(new Foo), true);
+            assertEq(() => ctx.access.has({}), false);
+            assertEq(() => ctx.access.get(new Foo), 0);
+            assertEq(() => {
+                const obj = new Foo;
+                ctx.access.set(obj, 123);
+                return get$foo(obj);
+            }, 123);
+        };
+    };
+    let get$foo;
+    let set$foo;
+    class Foo {
+        @dec
+        accessor #foo = 0;
+        static {
+            get$foo = x => x.#foo;
+            set$foo = (x, y) => { x.#foo = y; };
+        }
+    }
+    lateAsserts();
+    var obj = new Foo;
+    assertEq(() => set$foo(obj, 321), undefined);
+    assertEq(() => get$foo(obj), 321);
+})();

crates/swc_ecma_transforms_proposal/tests/decorator-evanw-split/Auto-accessor decorators: Basic (private static auto-accessor).js

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+(() => {
+    let lateAsserts;
+    const dec = (target, ctx) => {
+        assertEq(() => typeof target.get, 'function');
+        assertEq(() => typeof target.set, 'function');
+        assertEq(() => target.get.name, 'get #foo');
+        assertEq(() => target.set.name, 'set #foo');
+        assertEq(() => ctx.kind, 'accessor');
+        assertEq(() => ctx.name, '#foo');
+        assertEq(() => ctx.static, true);
+        assertEq(() => ctx.private, true);
+        lateAsserts = () => {
+            assertEq(() => ctx.access.has(Foo), true);
+            assertEq(() => ctx.access.has({}), false);
+            assertEq(() => ctx.access.get(Foo), 0);
+            assertEq(() => {
+                ctx.access.set(Foo, 123);
+                return get$foo(Foo);
+            }, 123);
+        };
+    };
+    let get$foo;
+    let set$foo;
+    class Foo {
+        @dec
+        static accessor #foo = 0;
+        static {
+            get$foo = x => x.#foo;
+            set$foo = (x, y) => { x.#foo = y; };
+        }
+    }
+    lateAsserts();
+    assertEq(() => set$foo(Foo, 321), undefined);
+    assertEq(() => get$foo(Foo), 321);
+})();

crates/swc_ecma_transforms_proposal/tests/decorator-evanw-split/Auto-accessor decorators: Basic (static auto-accessor).js

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+(() => {
+    const dec = (key, getName, setName) => (target, ctx) => {
+        assertEq(() => typeof target.get, 'function');
+        assertEq(() => typeof target.set, 'function');
+        assertEq(() => target.get.name, getName);
+        assertEq(() => target.set.name, setName);
+        assertEq(() => ctx.kind, 'accessor');
+        assertEq(() => ctx.name, key);
+        assertEq(() => ctx.static, true);
+        assertEq(() => ctx.private, false);
+        assertEq(() => ctx.access.has({ [key]: false }), true);
+        assertEq(() => ctx.access.has({ bar: true }), false);
+        assertEq(() => ctx.access.get({ [key]: 123 }), 123);
+        assertEq(() => {
+            const obj = {};
+            ctx.access.set(obj, 123);
+            return obj[key];
+        }, 123);
+    };
+    const bar = Symbol('bar');
+    const baz = Symbol();
+    class Foo {
+        @dec('foo', 'get foo', 'set foo')
+        static accessor foo = 0;
+        @dec(bar, 'get [bar]', 'set [bar]')
+        static accessor [bar] = 0;
+        @dec(baz, 'get ', 'set ')
+        static accessor [baz] = 0;
+    }
+    Foo.foo = 321;
+    assertEq(() => Foo.foo, 321);
+    Foo[bar] = 4321;
+    assertEq(() => Foo[bar], 4321);
+    Foo[baz] = 54321;
+    assertEq(() => Foo[baz], 54321);
+})();

crates/swc_ecma_transforms_proposal/tests/decorator-evanw-split/Auto-accessor decorators: Extra initializer (instance auto-accessor).js

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+(() => {
+    let oldAddInitializer;
+    let got;
+    const dec = (target, ctx) => {
+        ctx.addInitializer(function (...args) {
+            got = { this: this, args };
+        });
+        if (oldAddInitializer)
+            assertThrows(() => oldAddInitializer(() => { }), TypeError);
+        assertThrows(() => ctx.addInitializer({}), TypeError);
+        oldAddInitializer = ctx.addInitializer;
+    };
+    class Foo {
+        @dec
+        @dec
+        accessor foo;
+    }
+    assertEq(() => got, undefined);
+    const instance = new Foo;
+    assertEq(() => got.this, instance);
+    assertEq(() => got.args.length, 0);
+})();

crates/swc_ecma_transforms_proposal/tests/decorator-evanw-split/Auto-accessor decorators: Extra initializer (private instance auto-accessor).js

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+(() => {
+    let oldAddInitializer;
+    let got;
+    const dec = (target, ctx) => {
+        ctx.addInitializer(function (...args) {
+            got = { this: this, args };
+        });
+        if (oldAddInitializer)
+            assertThrows(() => oldAddInitializer(() => { }), TypeError);
+        assertThrows(() => ctx.addInitializer({}), TypeError);
+        oldAddInitializer = ctx.addInitializer;
+    };
+    class Foo {
+        @dec
+        @dec
+        accessor #foo;
+    }
+    assertEq(() => got, undefined);
+    const instance = new Foo;
+    assertEq(() => got.this, instance);
+    assertEq(() => got.args.length, 0);
+})();

crates/swc_ecma_transforms_proposal/tests/decorator-evanw-split/Auto-accessor decorators: Extra initializer (private static auto-accessor).js

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+(() => {
+    let oldAddInitializer;
+    let got;
+    const dec = (target, ctx) => {
+        ctx.addInitializer(function (...args) {
+            got = { this: this, args };
+        });
+        if (oldAddInitializer)
+            assertThrows(() => oldAddInitializer(() => { }), TypeError);
+        assertThrows(() => ctx.addInitializer({}), TypeError);
+        oldAddInitializer = ctx.addInitializer;
+    };
+    class Foo {
+        @dec
+        @dec
+        static accessor #foo;
+    }
+    assertEq(() => got.this, Foo);
+    assertEq(() => got.args.length, 0);
+})();

crates/swc_ecma_transforms_proposal/tests/decorator-evanw-split/Auto-accessor decorators: Extra initializer (static auto-accessor).js

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+(() => {
+    let oldAddInitializer;
+    let got;
+    const dec = (target, ctx) => {
+        ctx.addInitializer(function (...args) {
+            got = { this: this, args };
+        });
+        if (oldAddInitializer)
+            assertThrows(() => oldAddInitializer(() => { }), TypeError);
+        assertThrows(() => ctx.addInitializer({}), TypeError);
+        oldAddInitializer = ctx.addInitializer;
+    };
+    class Foo {
+        @dec
+        @dec
+        static accessor foo;
+    }
+    assertEq(() => got.this, Foo);
+    assertEq(() => got.args.length, 0);
+})();

crates/swc_ecma_transforms_proposal/tests/decorator-evanw-split/Auto-accessor decorators: Return null (instance auto-accessor).js

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+(() => {
+    assertThrows(() => {
+        const dec = (target, ctx) => {
+            return null;
+        };
+        class Foo {
+            @dec
+            accessor foo;
+        }
+    }, TypeError);
+})();

crates/swc_ecma_transforms_proposal/tests/decorator-evanw-split/Auto-accessor decorators: Return null (private instance auto-accessor).js

@@ -0,0 +1,11 @@
+(() => {
+    assertThrows(() => {
+        const dec = (target, ctx) => {
+            return null;
+        };
+        class Foo {
+            @dec
+            accessor #foo;
+        }
+    }, TypeError);
+})();

crates/swc_ecma_transforms_proposal/tests/decorator-evanw-split/Auto-accessor decorators: Return null (private static auto-accessor).js

@@ -0,0 +1,11 @@
+(() => {
+    assertThrows(() => {
+        const dec = (target, ctx) => {
+            return null;
+        };
+        class Foo {
+            @dec
+            static accessor #foo;
+        }
+    }, TypeError);
+})();

crates/swc_ecma_transforms_proposal/tests/decorator-evanw-split/Auto-accessor decorators: Return null (static auto-accessor).js

@@ -0,0 +1,11 @@
+(() => {
+    assertThrows(() => {
+        const dec = (target, ctx) => {
+            return null;
+        };
+        class Foo {
+            @dec
+            static accessor foo;
+        }
+    }, TypeError);
+})();

crates/swc_ecma_transforms_proposal/tests/decorator-evanw-split/Auto-accessor decorators: Shim (instance auto-accessor).js

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+(() => {
+    let get;
+    let set;
+    const dec = (target, ctx) => {
+        function init(x) {
+            assertEq(() => this instanceof Foo, true);
+            return x + 1;
+        }
+        get = function () { return target.get.call(this) * 10; };
+        set = function (x) { target.set.call(this, x * 2); };
+        return { get, set, init };
+    };
+    class Foo {
+        @dec
+        accessor foo = 123;
+    }
+    assertEq(() => Object.getOwnPropertyDescriptor(Foo.prototype, 'foo').get, get);
+    assertEq(() => Object.getOwnPropertyDescriptor(Foo.prototype, 'foo').set, set);
+    var obj = new Foo;
+    assertEq(() => obj.foo, (123 + 1) * 10);
+    obj.foo = 321;
+    assertEq(() => obj.foo, (321 * 2) * 10);
+})();

crates/swc_ecma_transforms_proposal/tests/decorator-evanw-split/Auto-accessor decorators: Shim (private instance auto-accessor).js

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+(() => {
+    let get;
+    let set;
+    const dec = (target, ctx) => {
+        function init(x) {
+            assertEq(() => this instanceof Foo, true);
+            return x + 1;
+        }
+        get = function () { return target.get.call(this) * 10; };
+        set = function (x) { target.set.call(this, x * 2); };
+        return { get, set, init };
+    };
+    let get$foo;
+    let set$foo;
+    class Foo {
+        @dec
+        accessor #foo = 123;
+        static {
+            get$foo = x => x.#foo;
+            set$foo = (x, y) => { x.#foo = y; };
+        }
+    }
+    var obj = new Foo;
+    assertEq(() => get$foo(obj), (123 + 1) * 10);
+    assertEq(() => set$foo(obj, 321), undefined);
+    assertEq(() => get$foo(obj), (321 * 2) * 10);
+})();