Use TypeScript project reference (#1002)

* Add *.tsbuildinfo to .gitignore

* Bump versions of dependencies, nyc and yargs

* Drop support for node 9 (EOL 2018-06-30)

https://github.com/nodejs/Release

* Add getTransaction snippet

snippets/tsconfig.json

@@ -0,0 +1,13 @@
+{
+  "extends": "../tsconfig-base",
+  "compilerOptions": {
+    "outDir": "./dist",
+    "rootDir": "./src"
+  },
+  "references": [
+    { "path": "../src" }
+  ],
+  "include": [
+    "./src/**/*.ts"
+  ]
+}