ci: add a tslint rule to require type definitions

ts_src/payments/lazy.ts

@@ -2,12 +2,12 @@ export function prop(object: {}, name: string, f: () => any): void {
   Object.defineProperty(object, name, {
     configurable: true,
     enumerable: true,
-    get() {
+    get(): any {
       const _value = f.call(this);
       this[name] = _value;
       return _value;
     },
-    set(_value) {
+    set(_value: any): void {
       Object.defineProperty(this, name, {
         configurable: true,
         enumerable: true,

ts_src/payments/p2ms.ts

@@ -28,7 +28,7 @@ export function p2ms(a: Payment, opts?: PaymentOpts): Payment {
     throw new TypeError('Not enough data');
   opts = Object.assign({ validate: true }, opts || {});
 
-  function isAcceptableSignature(x: Buffer | number) {
+  function isAcceptableSignature(x: Buffer | number): boolean {
     return (
       bscript.isCanonicalScriptSignature(x as Buffer) ||
       (opts!.allowIncomplete && (x as number) === OPS.OP_0) !== undefined