Test that spread removes readonly from properties

tests/baselines/reference/spreadTypeRemovesReadonly.js

@@ -0,0 +1,22 @@
+//// [spreadTypeRemovesReadonly.ts]
+interface ReadonlyData {
+    readonly value: string;
+}
+
+const data: ReadonlyData = { value: 'foo' };
+const clone = { ...data };
+clone.value = 'bar';
+
+
+//// [spreadTypeRemovesReadonly.js]
+var __assign = (this && this.__assign) || Object.assign || function(t) {
+    for (var s, i = 1, n = arguments.length; i < n; i++) {
+        s = arguments[i];
+        for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
+            t[p] = s[p];
+    }
+    return t;
+};
+var data = { value: 'foo' };
+var clone = __assign({}, data);
+clone.value = 'bar';

tests/baselines/reference/spreadTypeRemovesReadonly.symbols

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+=== tests/cases/compiler/spreadTypeRemovesReadonly.ts ===
+interface ReadonlyData {
+>ReadonlyData : Symbol(ReadonlyData, Decl(spreadTypeRemovesReadonly.ts, 0, 0))
+
+    readonly value: string;
+>value : Symbol(ReadonlyData.value, Decl(spreadTypeRemovesReadonly.ts, 0, 24))
+}
+
+const data: ReadonlyData = { value: 'foo' };
+>data : Symbol(data, Decl(spreadTypeRemovesReadonly.ts, 4, 5))
+>ReadonlyData : Symbol(ReadonlyData, Decl(spreadTypeRemovesReadonly.ts, 0, 0))
+>value : Symbol(value, Decl(spreadTypeRemovesReadonly.ts, 4, 28))
+
+const clone = { ...data };
+>clone : Symbol(clone, Decl(spreadTypeRemovesReadonly.ts, 5, 5))
+>data : Symbol(data, Decl(spreadTypeRemovesReadonly.ts, 4, 5))
+
+clone.value = 'bar';
+>clone.value : Symbol(value, Decl(spreadTypeRemovesReadonly.ts, 0, 24))
+>clone : Symbol(clone, Decl(spreadTypeRemovesReadonly.ts, 5, 5))
+>value : Symbol(value, Decl(spreadTypeRemovesReadonly.ts, 0, 24))
+

tests/baselines/reference/spreadTypeRemovesReadonly.types

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+=== tests/cases/compiler/spreadTypeRemovesReadonly.ts ===
+interface ReadonlyData {
+>ReadonlyData : ReadonlyData
+
+    readonly value: string;
+>value : string
+}
+
+const data: ReadonlyData = { value: 'foo' };
+>data : ReadonlyData
+>ReadonlyData : ReadonlyData
+>{ value: 'foo' } : { value: string; }
+>value : string
+>'foo' : "foo"
+
+const clone = { ...data };
+>clone : { value: string; }
+>{ ...data } : { value: string; }
+>data : ReadonlyData
+
+clone.value = 'bar';
+>clone.value = 'bar' : "bar"
+>clone.value : string
+>clone : { value: string; }
+>value : string
+>'bar' : "bar"
+

tests/cases/compiler/spreadTypeRemovesReadonly.ts

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+interface ReadonlyData {
+    readonly value: string;
+}
+
+const data: ReadonlyData = { value: 'foo' };
+const clone = { ...data };
+clone.value = 'bar';