[ethjs-signer] introduce typings (#18338)

* [ethjs-signer] introduce typings

* split function into two overloads in ethjs-signer package

types/ethjs-signer/ethjs-signer-tests.ts

@@ -0,0 +1,16 @@
+import { sign, recover } from "ethjs-signer";
+
+const nonce = 0;
+const privateKey = '0xecbcd9838f7f2afa6e809df8d7cdae69aa5dfc14d563ee98e97effd3f6a652f2';
+
+const transaction = {
+    to: '0xce31a19193d4b23f4e9d6163d7247243bAF801c3',
+    value: 300000,
+    gasPrice: 2000000,
+    nonce
+};
+
+const signedTransactionString = sign(transaction, privateKey) as string;
+const signedTransaction = sign(transaction, privateKey, true) as any[];
+
+const publicKey = recover(signedTransactionString, -1, signedTransaction[7], signedTransaction[8]);

types/ethjs-signer/index.d.ts

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+// Type definitions for ethjs-signer 0.1
+// Project: https://github.com/ethjs/ethjs-signer/
+// Definitions by: Bryson Thill <https://github.com/doppio>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.3
+
+/// <reference types="node" />
+
+/**
+ * Signs a raw transaction and return it either as a serialized hex string or raw tx object.
+ */
+export function sign(transaction: object, privateKey: string, toObject?: false): string;
+export function sign(transaction: object, privateKey: string, toObject: true): any[];
+
+/**
+ * Recovers a ECDSA public key from a raw transaction.
+ */
+export function recover(rawTx: string | Buffer, v: number, r: Buffer, s: Buffer): Buffer;

types/ethjs-signer/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [ ],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "ethjs-signer-tests.ts"
+    ]
+}

types/ethjs-signer/tslint.json

@@ -0,0 +1,3 @@
+{
+    "extends": "dtslint/dt.json"
+}