Add regression tests

Author: ahejlsberg

tests/baselines/reference/recursiveTypeRelations.errors.txt

@@ -0,0 +1,48 @@
+tests/cases/compiler/recursiveTypeRelations.ts(8,5): error TS2391: Function implementation is missing or not immediately following the declaration.
+tests/cases/compiler/recursiveTypeRelations.ts(27,38): error TS2304: Cannot find name 'ClassNameObject'.
+tests/cases/compiler/recursiveTypeRelations.ts(27,61): error TS2304: Cannot find name 'ClassNameObject'.
+
+
+==== tests/cases/compiler/recursiveTypeRelations.ts (3 errors) ====
+    // Repro from #14896
+    
+    type Attributes<Keys extends string> = {
+        [Key in Keys]: string;
+    }
+    
+    class Query<A extends Attributes<keyof A>> {
+        multiply<B extends Attributes<keyof B>>(x: B): Query<A & B>;
+        ~~~~~~~~
+!!! error TS2391: Function implementation is missing or not immediately following the declaration.
+    }
+    
+    // Repro from #14940
+    
+    type ClassName<S> = keyof S;
+    type ClassNameMap<S> = { [K in keyof S]?: boolean }
+    type ClassNameObjectMap<S> = object & ClassNameMap<S>;
+    type ClassNameArg<S> = ClassName<S> | ClassNameObjectMap<S>;
+    
+    export function css<S extends { [K in keyof S]: string }>(styles: S, ...classNames: ClassNameArg<S>[]): string {
+      const args = classNames.map(arg => {
+        if (arg == null) {
+          return null;
+        }
+        if (typeof arg == "string") {
+          return styles[arg];
+        }
+        if (typeof arg == "object") {
+          return Object.keys(arg).reduce<ClassNameObject>((obj: ClassNameObject, key: keyof S) => {
+                                         ~~~~~~~~~~~~~~~
+!!! error TS2304: Cannot find name 'ClassNameObject'.
+                                                                ~~~~~~~~~~~~~~~
+!!! error TS2304: Cannot find name 'ClassNameObject'.
+            const exportedClassName = styles[key];
+            obj[exportedClassName] = (arg as ClassNameMap<S>)[key]; 
+            return obj;
+          }, {});
+        }
+      });
+      return "";
+    }
+    

tests/baselines/reference/recursiveTypeRelations.js

@@ -0,0 +1,70 @@
+//// [recursiveTypeRelations.ts]
+// Repro from #14896
+
+type Attributes<Keys extends string> = {
+    [Key in Keys]: string;
+}
+
+class Query<A extends Attributes<keyof A>> {
+    multiply<B extends Attributes<keyof B>>(x: B): Query<A & B>;
+}
+
+// Repro from #14940
+
+type ClassName<S> = keyof S;
+type ClassNameMap<S> = { [K in keyof S]?: boolean }
+type ClassNameObjectMap<S> = object & ClassNameMap<S>;
+type ClassNameArg<S> = ClassName<S> | ClassNameObjectMap<S>;
+
+export function css<S extends { [K in keyof S]: string }>(styles: S, ...classNames: ClassNameArg<S>[]): string {
+  const args = classNames.map(arg => {
+    if (arg == null) {
+      return null;
+    }
+    if (typeof arg == "string") {
+      return styles[arg];
+    }
+    if (typeof arg == "object") {
+      return Object.keys(arg).reduce<ClassNameObject>((obj: ClassNameObject, key: keyof S) => {
+        const exportedClassName = styles[key];
+        obj[exportedClassName] = (arg as ClassNameMap<S>)[key]; 
+        return obj;
+      }, {});
+    }
+  });
+  return "";
+}
+
+
+//// [recursiveTypeRelations.js]
+// Repro from #14896
+"use strict";
+exports.__esModule = true;
+var Query = (function () {
+    function Query() {
+    }
+    return Query;
+}());
+function css(styles) {
+    var classNames = [];
+    for (var _i = 1; _i < arguments.length; _i++) {
+        classNames[_i - 1] = arguments[_i];
+    }
+    var args = classNames.map(function (arg) {
+        if (arg == null) {
+            return null;
+        }
+        if (typeof arg == "string") {
+            return styles[arg];
+        }
+        if (typeof arg == "object") {
+            return Object.keys(arg).reduce(function (obj, key) {
+                var exportedClassName = styles[key];
+                obj[exportedClassName] = arg[key];
+                return obj;
+            }, {});
+        }
+    });
+    return "";
+}
+exports.css = css;

tests/cases/compiler/recursiveTypeRelations.ts

@@ -0,0 +1,35 @@
+// Repro from #14896
+
+type Attributes<Keys extends string> = {
+    [Key in Keys]: string;
+}
+
+class Query<A extends Attributes<keyof A>> {
+    multiply<B extends Attributes<keyof B>>(x: B): Query<A & B>;
+}
+
+// Repro from #14940
+
+type ClassName<S> = keyof S;
+type ClassNameMap<S> = { [K in keyof S]?: boolean }
+type ClassNameObjectMap<S> = object & ClassNameMap<S>;
+type ClassNameArg<S> = ClassName<S> | ClassNameObjectMap<S>;
+
+export function css<S extends { [K in keyof S]: string }>(styles: S, ...classNames: ClassNameArg<S>[]): string {
+  const args = classNames.map(arg => {
+    if (arg == null) {
+      return null;
+    }
+    if (typeof arg == "string") {
+      return styles[arg];
+    }
+    if (typeof arg == "object") {
+      return Object.keys(arg).reduce<ClassNameObject>((obj: ClassNameObject, key: keyof S) => {
+        const exportedClassName = styles[key];
+        obj[exportedClassName] = (arg as ClassNameMap<S>)[key]; 
+        return obj;
+      }, {});
+    }
+  });
+  return "";
+}