Add test showing mismatched symbol constructor type interop

Author: weswigham

tests/baselines/reference/symbolObserverMismatchingPolyfillsWorkTogether.js

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+//// [symbolObserverMismatchingPolyfillsWorkTogether.ts]
+interface SymbolConstructor {
+    readonly observer: symbol;
+}
+interface SymbolConstructor {
+    readonly observer: unique symbol;
+}
+
+const obj = {
+    [Symbol.observer]: 0
+};
+
+//// [symbolObserverMismatchingPolyfillsWorkTogether.js]
+const obj = {
+    [Symbol.observer]: 0
+};
+
+
+//// [symbolObserverMismatchingPolyfillsWorkTogether.d.ts]
+interface SymbolConstructor {
+    readonly observer: symbol;
+}
+interface SymbolConstructor {
+    readonly observer: unique symbol;
+}
+declare const obj: {
+    [Symbol.observer]: number;
+};

tests/baselines/reference/symbolObserverMismatchingPolyfillsWorkTogether.symbols

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+=== tests/cases/compiler/symbolObserverMismatchingPolyfillsWorkTogether.ts ===
+interface SymbolConstructor {
+>SymbolConstructor : Symbol(SymbolConstructor, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(symbolObserverMismatchingPolyfillsWorkTogether.ts, 0, 0), Decl(symbolObserverMismatchingPolyfillsWorkTogether.ts, 2, 1))
+
+    readonly observer: symbol;
+>observer : Symbol(SymbolConstructor.observer, Decl(symbolObserverMismatchingPolyfillsWorkTogether.ts, 0, 29), Decl(symbolObserverMismatchingPolyfillsWorkTogether.ts, 3, 29))
+}
+interface SymbolConstructor {
+>SymbolConstructor : Symbol(SymbolConstructor, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(symbolObserverMismatchingPolyfillsWorkTogether.ts, 0, 0), Decl(symbolObserverMismatchingPolyfillsWorkTogether.ts, 2, 1))
+
+    readonly observer: unique symbol;
+>observer : Symbol(SymbolConstructor.observer, Decl(symbolObserverMismatchingPolyfillsWorkTogether.ts, 0, 29), Decl(symbolObserverMismatchingPolyfillsWorkTogether.ts, 3, 29))
+}
+
+const obj = {
+>obj : Symbol(obj, Decl(symbolObserverMismatchingPolyfillsWorkTogether.ts, 7, 5))
+
+    [Symbol.observer]: 0
+>[Symbol.observer] : Symbol([Symbol.observer], Decl(symbolObserverMismatchingPolyfillsWorkTogether.ts, 7, 13))
+>Symbol.observer : Symbol(SymbolConstructor.observer, Decl(symbolObserverMismatchingPolyfillsWorkTogether.ts, 0, 29), Decl(symbolObserverMismatchingPolyfillsWorkTogether.ts, 3, 29))
+>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --))
+>observer : Symbol(SymbolConstructor.observer, Decl(symbolObserverMismatchingPolyfillsWorkTogether.ts, 0, 29), Decl(symbolObserverMismatchingPolyfillsWorkTogether.ts, 3, 29))
+
+};

tests/baselines/reference/symbolObserverMismatchingPolyfillsWorkTogether.types

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+=== tests/cases/compiler/symbolObserverMismatchingPolyfillsWorkTogether.ts ===
+interface SymbolConstructor {
+    readonly observer: symbol;
+>observer : unique symbol
+}
+interface SymbolConstructor {
+    readonly observer: unique symbol;
+>observer : unique symbol
+}
+
+const obj = {
+>obj : { [Symbol.observer]: number; }
+>{    [Symbol.observer]: 0} : { [Symbol.observer]: number; }
+
+    [Symbol.observer]: 0
+>[Symbol.observer] : number
+>Symbol.observer : unique symbol
+>Symbol : SymbolConstructor
+>observer : unique symbol
+>0 : 0
+
+};

tests/cases/compiler/symbolObserverMismatchingPolyfillsWorkTogether.ts

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+// @declaration: true
+// @target: es6
+interface SymbolConstructor {
+    readonly observer: symbol;
+}
+interface SymbolConstructor {
+    readonly observer: unique symbol;
+}
+
+const obj = {
+    [Symbol.observer]: 0
+};