add tests

Author: a-tarasyuk

tests/baselines/reference/ambientPropertyDeclarationInJs.errors.txt

@@ -0,0 +1,27 @@
+/test.js(3,8): error TS2322: Type '{}' is not assignable to type 'string'.
+/test.js(6,4): error TS8009: The 'declare' modifier can only be used in TypeScript files.
+/test.js(6,18): error TS8010: Type annotations can only be used in TypeScript files.
+/test.js(9,18): error TS2339: Property 'foo' does not exist on type 'string'.
+
+
+==== /test.js (4 errors) ====
+    class Foo {
+       constructor() {
+           this.prop = { };
+           ~~~~~~~~~
+!!! error TS2322: Type '{}' is not assignable to type 'string'.
+       }
+    
+       declare prop: string;
+       ~~~~~~~
+!!! error TS8009: The 'declare' modifier can only be used in TypeScript files.
+                     ~~~~~~
+!!! error TS8010: Type annotations can only be used in TypeScript files.
+    
+       method() {
+           this.prop.foo
+                     ~~~
+!!! error TS2339: Property 'foo' does not exist on type 'string'.
+       }
+    }
+    

tests/baselines/reference/ambientPropertyDeclarationInJs.symbols

@@ -0,0 +1,24 @@
+=== /test.js ===
+class Foo {
+>Foo : Symbol(Foo, Decl(test.js, 0, 0))
+
+   constructor() {
+       this.prop = { };
+>this.prop : Symbol(Foo.prop, Decl(test.js, 1, 18), Decl(test.js, 3, 4))
+>this : Symbol(Foo, Decl(test.js, 0, 0))
+>prop : Symbol(Foo.prop, Decl(test.js, 1, 18), Decl(test.js, 3, 4))
+   }
+
+   declare prop: string;
+>prop : Symbol(Foo.prop, Decl(test.js, 1, 18), Decl(test.js, 3, 4))
+
+   method() {
+>method : Symbol(Foo.method, Decl(test.js, 5, 24))
+
+       this.prop.foo
+>this.prop : Symbol(Foo.prop, Decl(test.js, 1, 18), Decl(test.js, 3, 4))
+>this : Symbol(Foo, Decl(test.js, 0, 0))
+>prop : Symbol(Foo.prop, Decl(test.js, 1, 18), Decl(test.js, 3, 4))
+   }
+}
+

tests/baselines/reference/ambientPropertyDeclarationInJs.types

@@ -0,0 +1,28 @@
+=== /test.js ===
+class Foo {
+>Foo : Foo
+
+   constructor() {
+       this.prop = { };
+>this.prop = { } : {}
+>this.prop : string
+>this : this
+>prop : string
+>{ } : {}
+   }
+
+   declare prop: string;
+>prop : string
+
+   method() {
+>method : () => void
+
+       this.prop.foo
+>this.prop.foo : any
+>this.prop : string
+>this : this
+>prop : string
+>foo : any
+   }
+}
+

tests/cases/compiler/ambientPropertyDeclarationInJs.ts

@@ -0,0 +1,16 @@
+// @allowJs: true
+// @checkJs: true
+// @noEmit: true
+// @filename: /test.js
+
+class Foo {
+   constructor() {
+       this.prop = { };
+   }
+
+   declare prop: string;
+
+   method() {
+       this.prop.foo
+   }
+}