1 files changed, 71 insertions, 0 deletions
diff --git a/src/test/fixtures/namespaced-validators.ts b/src/test/fixtures/namespaced-validators.ts
new file mode 100644
index 000000000..fcafcb139
--- /dev/null
+++ b/src/test/fixtures/namespaced-validators.ts
@@ -0,0 +1,71 @@
+enum AllTheWays {
+  you = 1,
+  can = "can",
+  enum = 2,
+  really,
+  for,
+  namespace,
+  let,
+  of,
+  const,
+  var,
+  while,
+  true = 8,
+}
+
+enum LogLevel {
+  ERROR,
+  WARN,
+  INFO,
+  DEBUG,
+}
+
+/**
+ * This is equivalent to:
+ * type LogLevelStrings = 'ERROR' | 'WARN' | 'INFO' | 'DEBUG';
+ */
+type LogLevelStrings = keyof typeof LogLevel;
+
+function printImportant(key: LogLevelStrings, message: string) {
+  const num = LogLevel[key];
+  if (num <= LogLevel.WARN) {
+    console.log("Log level key is:", key);
+    console.log("Log level value is:", num);
+    console.log("Log level message is:", message);
+  }
+}
+printImportant("WARN", "This is a message");
+
+namespace Validation {
+  export interface StringValidator {
+    isAcceptable(s: string): boolean;
+  }
+  const lettersRegexp = /^[A-Za-z]+$/;
+  const numberRegexp = /^[0-9]+$/;
+  export class LettersOnlyValidator implements StringValidator {
+    isAcceptable(s: string) {
+      return lettersRegexp.test(s);
+    }
+  }
+  export class ZipCodeValidator implements StringValidator {
+    isAcceptable(s: string) {
+      return s.length === 5 && numberRegexp.test(s);
+    }
+  }
+}
+// Some samples to try
+let strings = ["Hello", "98052", "101"];
+// Validators to use
+let validators: { [s: string]: Validation.StringValidator } = {};
+validators["ZIP code"] = new Validation.ZipCodeValidator();
+validators["Letters only"] = new Validation.LettersOnlyValidator();
+// Show whether each string passed each validator
+for (let s of strings) {
+  for (let name in validators) {
+    console.log(
+      `"${s}" - ${
+        validators[name].isAcceptable(s) ? "matches" : "does not match"
+      } ${name}`
+    );
+  }
+}