fix: support declare in classes (#218)

Author: buschtoens

src/index.js

@@ -34,21 +34,25 @@ module.exports = {
         loader: 'babel-loader-8',
         options: {
           plugins: [
-            // Transpile class properties
-            // @see https://github.com/typed-ember/ember-cli-typescript/blob/b2e75abc98beefe635b6cfd8808c887813acb44e/ts/addon.ts#L99
-            require.resolve('@babel/plugin-proposal-class-properties'),
+            // https://github.com/babel/ember-cli-babel/blob/036723709e26aba68eee1d5a9df49f97944e435b/index.js#L359-L385
+            [
+              require.resolve('@babel/plugin-transform-typescript'),
+              { allowDeclareFields: true }
+            ],
+
+            // https://github.com/babel/ember-cli-babel/blob/036723709e26aba68eee1d5a9df49f97944e435b/index.js#L403-L409
+            [
+              require.resolve('@babel/plugin-proposal-decorators'),
+              { legacy: true }
+            ],
 
-            // Transpile new syntax, which is apparently not yet handled by
-            // `@babel/preset-env`.
-            // @see https://github.com/typed-ember/ember-cli-typescript/blob/b2e75abc98beefe635b6cfd8808c887813acb44e/ts/addon.ts#L89-L94
-            require.resolve('@babel/plugin-proposal-optional-chaining'),
-            require.resolve(
-              '@babel/plugin-proposal-nullish-coalescing-operator'
-            )
+            // https://github.com/babel/ember-cli-babel/blob/036723709e26aba68eee1d5a9df49f97944e435b/index.js#L420-L426
+            [
+              require.resolve('@babel/plugin-proposal-class-properties'),
+              { loose: true }
+            ]
           ],
           presets: [
-            // Transpile TypeScript
-            require.resolve('@babel/preset-typescript'),
             // Transpile incompatible syntax for project build targets
             [
               require.resolve('@babel/preset-env'),

src/package.json

@@ -16,11 +16,10 @@
     "lint:js": "eslint --ext ts,js ."
   },
   "dependencies": {
-    "@babel/plugin-proposal-class-properties": "^7.10.4",
-    "@babel/plugin-proposal-nullish-coalescing-operator": "^7.12.1",
-    "@babel/plugin-proposal-optional-chaining": "^7.12.1",
-    "@babel/preset-env": "^7.12.1",
-    "@babel/preset-typescript": "^7.12.1"
+    "@babel/plugin-proposal-class-properties": "^7.12.1",
+    "@babel/plugin-proposal-decorators": "^7.12.1",
+    "@babel/plugin-transform-typescript": "^7.12.1",
+    "@babel/preset-env": "^7.12.1"
   },
   "devDependencies": {
     "@clark/eslint-config-node": "^1.28.2",

tests/ts-module-a/index.ts

@@ -9,4 +9,10 @@ export enum SomeEnum {
   Bar
 }
 
+export class SomeClass {
+  someProperty = true;
+  private somePrivateProperty = true;
+  declare someDeclaredProperty: true;
+}
+
 export type { SomeType } from './types-only';

yarn.lock

@@ -407,6 +407,15 @@
     "@babel/helper-plugin-utils" "^7.10.4"
     "@babel/plugin-syntax-decorators" "^7.10.4"
 
+"@babel/plugin-proposal-decorators@^7.12.1":
+  version "7.12.1"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-proposal-decorators/-/plugin-proposal-decorators-7.12.1.tgz#59271439fed4145456c41067450543aee332d15f"
+  integrity sha512-knNIuusychgYN8fGJHONL0RbFxLGawhXOJNLBk75TniTsZZeA+wdkDuv6wp4lGwzQEKjZi6/WYtnb3udNPmQmQ==
+  dependencies:
+    "@babel/helper-create-class-features-plugin" "^7.12.1"
+    "@babel/helper-plugin-utils" "^7.10.4"
+    "@babel/plugin-syntax-decorators" "^7.12.1"
+
 "@babel/plugin-proposal-dynamic-import@^7.12.1":
   version "7.12.1"
   resolved "https://registry.yarnpkg.com/@babel/plugin-proposal-dynamic-import/-/plugin-proposal-dynamic-import-7.12.1.tgz#43eb5c2a3487ecd98c5c8ea8b5fdb69a2749b2dc"
@@ -518,6 +527,13 @@
   dependencies:
     "@babel/helper-plugin-utils" "^7.10.4"
 
+"@babel/plugin-syntax-decorators@^7.12.1":
+  version "7.12.1"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-syntax-decorators/-/plugin-syntax-decorators-7.12.1.tgz#81a8b535b284476c41be6de06853a8802b98c5dd"
+  integrity sha512-ir9YW5daRrTYiy9UJ2TzdNIJEZu8KclVzDcfSt4iEmOtwQ4llPtWInNKJyKnVXp1vE4bbVd5S31M/im3mYMO1w==
+  dependencies:
+    "@babel/helper-plugin-utils" "^7.10.4"
+
 "@babel/plugin-syntax-dynamic-import@^7.2.0", "@babel/plugin-syntax-dynamic-import@^7.8.0":
   version "7.8.0"
   resolved "https://registry.yarnpkg.com/@babel/plugin-syntax-dynamic-import/-/plugin-syntax-dynamic-import-7.8.0.tgz#3a6c1cd36af923db602df83c5aa72e08bb14353a"
@@ -977,14 +993,6 @@
     "@babel/types" "^7.4.4"
     esutils "^2.0.2"
 
-"@babel/preset-typescript@^7.12.1":
-  version "7.12.1"
-  resolved "https://registry.yarnpkg.com/@babel/preset-typescript/-/preset-typescript-7.12.1.tgz#86480b483bb97f75036e8864fe404cc782cc311b"
-  integrity sha512-hNK/DhmoJPsksdHuI/RVrcEws7GN5eamhi28JkO52MqIxU8Z0QpmiSOQxZHWOHV7I3P4UjHV97ay4TcamMA6Kw==
-  dependencies:
-    "@babel/helper-plugin-utils" "^7.10.4"
-    "@babel/plugin-transform-typescript" "^7.12.1"
-
 "@babel/runtime@^7.12.0", "@babel/runtime@^7.8.4":
   version "7.12.1"
   resolved "https://registry.yarnpkg.com/@babel/runtime/-/runtime-7.12.1.tgz#b4116a6b6711d010b2dad3b7b6e43bf1b9954740"