fix(es/transforms/proposal): Fix type detection (#2431)

swc_ecma_transforms_proposal:
 - Try the type of the LHS of an assignment pattern. (#2428)

Cargo.lock

@@ -2900,7 +2900,7 @@ dependencies = [
 
 [[package]]
 name = "swc_ecma_transforms_proposal"
-version = "0.46.0"
+version = "0.46.1"
 dependencies = [
  "either",
  "serde",

ecmascript/transforms/proposal/Cargo.toml

@@ -6,7 +6,7 @@ edition = "2018"
 license = "Apache-2.0/MIT"
 name = "swc_ecma_transforms_proposal"
 repository = "https://github.com/swc-project/swc.git"
-version = "0.46.0"
+version = "0.46.1"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

ecmascript/transforms/proposal/src/decorators/legacy/metadata.rs

@@ -600,7 +600,9 @@ fn get_type_ann_of_pat(p: &Pat) -> Option<&TsTypeAnn> {
         Pat::Array(p) => &p.type_ann,
         Pat::Rest(p) => &p.type_ann,
         Pat::Object(p) => &p.type_ann,
-        Pat::Assign(p) => &p.type_ann,
+        Pat::Assign(p) => {
+            return p.type_ann.as_ref().or_else(|| get_type_ann_of_pat(&p.left));
+        }
         Pat::Invalid(_) => return None,
         Pat::Expr(_) => return None,
     }

ecmascript/transforms/tests/decorators.rs

@@ -5031,7 +5031,7 @@ var _dec9 = typeof Reflect !== "undefined" && typeof Reflect.metadata === "funct
     Function,
     Boolean,
     Boolean,
-    void 0
+    String
 ]), _dec10 = typeof Reflect !== "undefined" && typeof Reflect.metadata === "function" && Reflect.metadata("design:type", Function), _dec11 = Decorate();
 let Sample = _class = _dec11(_class = _dec10(_class = _dec9(((_class = class Sample {
     constructor(private p0: String, p1: Number, p2: 10, p3: "ABC", p4: boolean, p5: string, p6: number, p7: Object, p8: () => any, p9: "abc" | "def", p10: String | Number, p11: Function, p12: null, p13: undefined, p14: any, p15: (abc: any) => void, p16: false, p17: true, p18: string = "abc"){
@@ -5069,14 +5069,14 @@ let Sample = _class = _dec11(_class = _dec10(_class = _dec9(((_class = class Sam
     _dec1,
     _dec2
 ], Object.getOwnPropertyDescriptor(_class.prototype, "method"), _class.prototype), _dec3 = Decorate(), _dec4 = typeof Reflect !== "undefined" && typeof Reflect.metadata === "function" && Reflect.metadata("design:type", Function), _dec5 = typeof Reflect !== "undefined" && typeof Reflect.metadata === "function" && Reflect.metadata("design:paramtypes", [
-    void 0,
+    typeof Decorate === "undefined" || typeof Decorate.Name === "undefined" ? Object : Decorate.Name,
     typeof Decorate === "undefined" || typeof Decorate.Name === "undefined" ? Object : Decorate.Name
 ]), _applyDecoratedDescriptor(_class.prototype, "method2", [
     _dec3,
     _dec4,
     _dec5
 ], Object.getOwnPropertyDescriptor(_class.prototype, "method2"), _class.prototype), _dec6 = Decorate(), _dec7 = typeof Reflect !== "undefined" && typeof Reflect.metadata === "function" && Reflect.metadata("design:type", Function), _dec8 = typeof Reflect !== "undefined" && typeof Reflect.metadata === "function" && Reflect.metadata("design:paramtypes", [
-    void 0
+    String
 ]), _applyDecoratedDescriptor(_class.prototype, "assignments", [
     _dec6,
     _dec7,

tests/fixture/issue-2428/1/input/.swcrc

@@ -0,0 +1,22 @@
+{
+    "jsc": {
+        "parser": {
+            "syntax": "typescript",
+            "tsx": false,
+            "decorators": true,
+            "dynamicImport": false
+        },
+        "transform": {
+            "legacyDecorator": true,
+            "decoratorMetadata": true
+        },
+        "target": "es2016"
+    },
+    "module": {
+        "type": "commonjs",
+        "strict": false,
+        "strictMode": true,
+        "lazy": false,
+        "noInterop": false
+    }
+}

tests/fixture/issue-2428/1/input/index.ts

@@ -0,0 +1,10 @@
+
+class Foo {
+    async fnName1(
+        @Arg('GraphQLArgName', { nullable: true }) argName: boolean,
+    ): Promise<number> { }
+
+    async fnName2(
+        @Arg('GraphQLArgName', { nullable: true }) argName: boolean = false,
+    ): Promise<number> { }
+}

tests/fixture/issue-2428/1/output/index.ts

@@ -0,0 +1,85 @@
+"use strict";
+function _applyDecoratedDescriptor(target, property, decorators, descriptor, context) {
+    var desc = {
+    };
+    Object.keys(descriptor).forEach(function(key) {
+        desc[key] = descriptor[key];
+    });
+    desc.enumerable = !!desc.enumerable;
+    desc.configurable = !!desc.configurable;
+    if ("value" in desc || desc.initializer) {
+        desc.writable = true;
+    }
+    desc = decorators.slice().reverse().reduce(function(desc, decorator) {
+        return decorator ? decorator(target, property, desc) || desc : desc;
+    }, desc);
+    if (context && desc.initializer !== void 0) {
+        desc.value = desc.initializer ? desc.initializer.call(context) : void 0;
+        desc.initializer = undefined;
+    }
+    if (desc.initializer === void 0) {
+        Object.defineProperty(target, property, desc);
+        desc = null;
+    }
+    return desc;
+}
+function asyncGeneratorStep(gen, resolve, reject, _next, _throw, key, arg) {
+    try {
+        var info = gen[key](arg);
+        var value = info.value;
+    } catch (error) {
+        reject(error);
+        return;
+    }
+    if (info.done) {
+        resolve(value);
+    } else {
+        Promise.resolve(value).then(_next, _throw);
+    }
+}
+function _asyncToGenerator(fn) {
+    return function() {
+        var self = this, args = arguments;
+        return new Promise(function(resolve, reject) {
+            var gen = fn.apply(self, args);
+            function _next(value) {
+                asyncGeneratorStep(gen, resolve, reject, _next, _throw, "next", value);
+            }
+            function _throw(err) {
+                asyncGeneratorStep(gen, resolve, reject, _next, _throw, "throw", err);
+            }
+            _next(undefined);
+        });
+    };
+}
+var _class, _dec, _dec1, _dec2, _dec3, _dec4, _dec5;
+let Foo1 = ((_class = class Foo {
+    fnName1(argName) {
+        return _asyncToGenerator(function*() {
+        })();
+    }
+    fnName2(argName = false) {
+        return _asyncToGenerator(function*() {
+        })();
+    }
+}) || _class, _dec = function(target, key) {
+    return Arg('GraphQLArgName', {
+        nullable: true
+    })(target, key, 0);
+}, _dec1 = typeof Reflect !== "undefined" && typeof Reflect.metadata === "function" && Reflect.metadata("design:type", Function), _dec2 = typeof Reflect !== "undefined" && typeof Reflect.metadata === "function" && Reflect.metadata("design:paramtypes", [
+    Boolean
+]), _applyDecoratedDescriptor(_class.prototype, "fnName1", [
+    _dec,
+    _dec1,
+    _dec2
+], Object.getOwnPropertyDescriptor(_class.prototype, "fnName1"), _class.prototype), _dec3 = function(target, key) {
+    return Arg('GraphQLArgName', {
+        nullable: true
+    })(target, key, 0);
+}, _dec4 = typeof Reflect !== "undefined" && typeof Reflect.metadata === "function" && Reflect.metadata("design:type", Function), _dec5 = typeof Reflect !== "undefined" && typeof Reflect.metadata === "function" && Reflect.metadata("design:paramtypes", [
+    Boolean
+]), _applyDecoratedDescriptor(_class.prototype, "fnName2", [
+    _dec3,
+    _dec4,
+    _dec5
+], Object.getOwnPropertyDescriptor(_class.prototype, "fnName2"), _class.prototype), _class);