Add types for ethereumjs-tx (#26118)

types/ethereumjs-tx/ethereumjs-tx-tests.ts

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+import EthereumjsTx = require('ethereumjs-tx');
+
+const txParams = {};
+const tx = new EthereumjsTx(txParams);

types/ethereumjs-tx/index.d.ts

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+// Type definitions for ethereumjs-tx 1.0
+// Project: https://github.com/ethereumjs/ethereumjs-tx
+// Definitions by: Leonid Logvinov <https://github.com/LogvinovLeon>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/// <reference types="node"/>
+
+declare class EthereumTx {
+    raw: Buffer[];
+    r: Buffer;
+    s: Buffer;
+    v: Buffer;
+    nonce: Buffer;
+    serialize(): Buffer;
+    sign(buffer: Buffer): void;
+    getSenderAddress(): Buffer;
+    constructor(txParams: any);
+}
+export = EthereumTx;

types/ethereumjs-tx/tsconfig.json

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

types/ethereumjs-tx/tslint.json

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+{ "extends": "dtslint/dt.json" }