Add tests

tests/cases/conformance/classes/propertyMemberDeclarations/strictPropertyInitialization.ts

@@ -0,0 +1,77 @@
+// @strict: true
+// @declaration: true
+
+// Properties with non-undefined types require initialization
+
+class C1 {
+    a: number;  // Error
+    b: number | undefined;
+    c: number | null;  // Error
+    d?: number;
+}
+
+// No strict initialization checks in ambient contexts
+
+declare class C2 {
+    a: number;
+    b: number | undefined;
+    c: number | null;
+    d?: number;
+}
+
+// No strict initialization checks for static members
+
+class C3 {
+    static a: number;
+    static b: number | undefined;
+    static c: number | null;
+    static d?: number;
+}
+
+// Initializer satisfies strict initialization check
+
+class C4 {
+    a = 0;
+    b: number = 0;
+    c: string = "abc";
+}
+
+// Assignment in constructor satisfies strict initialization check
+
+class C5 {
+    a: number;
+    constructor() {
+        this.a = 0;
+    }
+}
+
+// All code paths must contain assignment
+
+class C6 {
+    a: number;  // Error
+    constructor(cond: boolean) {
+        if (cond) {
+            return;
+        }
+        this.a = 0;
+    }
+}
+
+class C7 {
+    a: number;
+    constructor(cond: boolean) {
+        if (cond) {
+            this.a = 1;
+            return;
+        }
+        this.a = 0;
+    }
+}
+
+// Properties with string literal names aren't checked
+
+class C8 {
+    a: number;  // Error
+    "b": number;
+    0: number;
+}