Set up format and lint configs

.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 2
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.py]
+indent_size = 4

.eslintrc.json

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+{
+  "env": {
+    "es6": true,
+    "jasmine": true,
+    "node": true,
+    "worker": true
+  },
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": {
+    "ecmaVersion": 2018
+  },
+  "plugins": ["@typescript-eslint", "prettier", "simple-import-sort", "import"],
+  "extends": [
+    "eslint:recommended",
+    "plugin:@typescript-eslint/recommended",
+    "prettier/@typescript-eslint",
+    "plugin:prettier/recommended",
+    "plugin:import/typescript"
+  ],
+  "rules": {
+    "curly": ["warn", "multi-line", "consistent"],
+    "no-console": ["warn", { "allow": ["error", "info", "warn"] }],
+    "no-param-reassign": "warn",
+    "no-shadow": "warn",
+    "prefer-const": "warn",
+    "spaced-comment": ["warn", "always", { "line": { "markers": ["/ <reference"] } }],
+    "import/no-cycle": "warn",
+    "simple-import-sort/sort": "warn",
+    "@typescript-eslint/explicit-function-return-type": ["warn", { "allowExpressions": true }],
+    "@typescript-eslint/no-empty-interface": "off",
+    "@typescript-eslint/no-explicit-any": "off",
+    "@typescript-eslint/no-unused-vars": ["warn", { "argsIgnorePattern": "^_", "varsIgnorePattern": "^_" }],
+    "@typescript-eslint/no-use-before-define": "warn"
+  },
+  "overrides": [
+    {
+      "files": "**/*.js",
+      "rules": {
+        "@typescript-eslint/no-var-requires": "off"
+      }
+    },
+    {
+      "files": "**/*.spec.ts",
+      "rules": {
+        "@typescript-eslint/no-non-null-assertion": "off"
+      }
+    },
+    {
+      "files": "jasmine-testrunner.js",
+      "rules": {
+        "@typescript-eslint/camelcase": ["error", { "properties": "never" }]
+      }
+    },
+    {
+      "files": "packages/{iov-bns,iov-tendermint-rpc}/**/*.ts",
+      "rules": {
+        "@typescript-eslint/camelcase": ["error", { "allow": ["v0_[0-9]+"] }]
+      }
+    }
+  ]
+}

.prettierrc.json

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+{
+  "printWidth": 110,
+  "trailingComma": "all"
+}