Add verror definitions and tests

verror/verror-tests.ts

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+// Type definitions for verror v1.6.0
+// Project: https://github.com/davepacheco/node-verror
+// Definitions by: Sven Reglitzki <https://github.com/svi3c/>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+/// <reference path="verror.d.ts" />
+
+import VError = require("verror");
+
+var error = new Error("foo");
+var verror1 = new VError(error, "bar");
+var verror2 = new VError.VError(error, "bar");
+var serror = new VError.SError(error, "bar");
+var multiError = new VError.MultiError([verror1, verror2]);
+var werror = new VError.WError(verror1, "foobar");
+
+var cause1: Error = verror1.cause();
+var cause2: Error = werror.cause();

verror/verror.d.ts

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+// Type definitions for verror v1.6.0
+// Project: https://github.com/davepacheco/node-verror
+// Definitions by: Sven Reglitzki <https://github.com/svi3c/>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+declare module "verror" {
+
+    /*
+     * VError([cause], fmt[, arg...]): Like JavaScript's built-in Error class, but
+     * supports a "cause" argument (another error) and a printf-style message.  The
+     * cause argument can be null or omitted entirely.
+     *
+     * Examples:
+     *
+     * CODE                                    MESSAGE
+     * new VError('something bad happened')    "something bad happened"
+     * new VError('missing file: "%s"', file)  "missing file: "/etc/passwd"
+     *   with file = '/etc/passwd'
+     * new VError(err, 'open failed')          "open failed: file not found"
+     *   with err.message = 'file not found'
+     */
+    class VError extends Error {
+        static VError: typeof VError;
+        static SError: typeof SError;
+        static MultiError: typeof MultiError;
+        static WError: typeof WError;
+        cause():Error;
+        constructor(cause: Error, message: string, ...params: any[]);
+        constructor(message: string, ...params: any[]);
+    }
+
+    /*
+     * SError is like VError, but stricter about types.  You cannot pass "null" or
+     * "undefined" as string arguments to the formatter.  Since SError is only a
+     * different function, not really a different class, we don't set
+     * SError.prototype.name.
+     */
+    class SError extends VError {
+    }
+
+    /*
+     * Represents a collection of errors for the purpose of consumers that generally
+     * only deal with one error.  Callers can extract the individual errors
+     * contained in this object, but may also just treat it as a normal single
+     * error, in which case a summary message will be printed.
+     */
+    class MultiError extends VError {
+        constructor(errors: Error[]);
+    }
+
+    /*
+     * Like JavaScript's built-in Error class, but supports a "cause" argument which
+     * is wrapped, not "folded in" as with VError.	Accepts a printf-style message.
+     * The cause argument can be null.
+     */
+    class WError extends Error {
+        cause():Error;
+        constructor(cause: Error, message: string, ...params: any[]);
+        constructor(message: string, ...params: any[]);
+    }
+
+    export = VError;
+}