Remove node built in from sdk

packages/sdk/.eslintrc.js

 module.exports = {
   extends: '../../.eslintrc.js',
+  overrides: [
+    {
+      files: ['src/**/*.ts'],
+      rules: {
+        'no-restricted-imports': [
+          'error',
+          'assert',
+          'buffer',
+          'child_process',
+          'cluster',
+          'crypto',
+          'dgram',
+          'dns',
+          'domain',
+          'events',
+          'freelist',
+          'fs',
+          'http',
+          'https',
+          'module',
+          'net',
+          'os',
+          'path',
+          'punycode',
+          'querystring',
+          'readline',
+          'repl',
+          'smalloc',
+          'stream',
+          'string_decoder',
+          'sys',
+          'timers',
+          'tls',
+          'tracing',
+          'tty',
+          'url',
+          'util',
+          'vm',
+          'zlib',
+        ],
+      },
+    },
+  ],
 }

packages/sdk/src/l2-provider.ts

-import assert from 'assert'
-
 import { Provider, TransactionRequest } from '@ethersproject/abstract-provider'
 import { serialize } from '@ethersproject/transactions'
 import { Contract, BigNumber } from 'ethers'
 import { predeploys, getContractInterface } from '@eth-optimism/contracts'
 import cloneDeep from 'lodash/cloneDeep'
 
+import { assert } from './utils/assert'
 import { L2Provider, ProviderLike, NumberLike } from './interfaces'
 import { toProvider, toNumber, toBigNumber } from './utils'
 

packages/sdk/src/utils/assert.ts

+export const assert = (condition: boolean, message: string): void => {
+  if (!condition) {
+    throw new Error(message)
+  }
+}

packages/sdk/src/utils/coercion.ts

-import assert from 'assert'
-
 import {
   Provider,
   TransactionReceipt,
@@ -8,6 +6,7 @@ import {
 import { Signer } from '@ethersproject/abstract-signer'
 import { ethers, BigNumber } from 'ethers'
 
+import { assert } from './assert'
 import {
   SignerOrProviderLike,
   ProviderLike,