Added tests.

tests/cases/compiler/omitTypeTestErrors01.ts

@@ -0,0 +1,19 @@
+// @declaration: true
+
+interface Foo {
+    a: string;
+    b: number;
+    c: boolean;
+}
+
+export type Bar = Omit<Foo, "c">;
+export type Baz = Omit<Foo, "b" | "c">;
+
+export function getBarC(bar: Bar) {
+    return bar.c;
+}
+
+export function getBazB(baz: Baz) {
+    return baz.b;
+}
+

tests/cases/compiler/omitTypeTests01.ts

@@ -0,0 +1,19 @@
+// @declaration: true
+
+interface Foo {
+    a: string;
+    b: number;
+    c: boolean;
+}
+
+export type Bar = Omit<Foo, "c">;
+export type Baz = Omit<Foo, "b" | "c">;
+
+export function getBarA(bar: Bar) {
+    return bar.a;
+}
+
+export function getBazA(baz: Baz) {
+    return baz.a;
+}
+