Add cosmjs-util package with custom gas parsing

.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+
+# Dependency directories
+node_modules/
+
+# TypeScript build output
+dist/
+
+# Editor directories and files
+.vscode/
+.idea/
+*.sublime-project
+*.sublime-workspace
+
+# Environment variables
+.env
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+# Crash reports
+*.crash
+
+# Yarn
+.yarn/
+.pnp.*
+
+# npm
+.npm/
+
+# misc
+.nyc_output/
+.cache/
+.eslintcache

eslint.config.js

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+const eslint = require("@eslint/js");
+const tseslint = require("typescript-eslint");
+
+module.exports = tseslint.config(
+  eslint.configs.recommended,
+  ...tseslint.configs.recommended,
+  {
+    files: ["src/**/*.ts"],
+    languageOptions: {
+      parser: tseslint.parser,
+      parserOptions: {
+        ecmaVersion: 2020,
+        sourceType: "module",
+        project: "./tsconfig.json",
+      },
+    },
+    rules: {
+      // Add any specific rules here
+    },
+  }
+);

package.json

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+{
+  "name": "@LaconicNetwork/cosmjs-util",
+  "version": "1.0.0",
+  "main": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "scripts": {
+    "build": "tsc",
+    "lint": "eslint src/**/*.ts"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "description": "",
+  "devDependencies": {
+    "@typescript-eslint/eslint-plugin": "^8.34.1",
+    "@typescript-eslint/parser": "^8.34.1",
+    "eslint": "^9.29.0",
+    "typescript": "^5.8.3",
+    "typescript-eslint": "^8.34.1"
+  },
+  "dependencies": {
+    "@cosmjs/stargate": "^0.33.1",
+    "@cosmjs/math": "^0.33.1"
+  }
+}

src/index.ts

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+export * from './utils';

src/utils.ts

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+import { GasPrice } from '@cosmjs/stargate';
+import { Decimal } from '@cosmjs/math';
+
+// Ref: https://github.com/cosmos/cosmjs/blob/v0.33.1/packages/stargate/src/fee.ts#L38
+/**
+ * Parses a gas price string with a more flexible denom regex.
+ * This function is a custom implementation to allow for denoms that can start with
+ * numbers or other valid characters, while still supporting an optional dollar sign prefix.
+ *
+ * @param gasPrice The gas price string, e.g., '0.012utoken' or '0.001$mydenom'.
+ * @returns A GasPrice object.
+ * @throws If the gas price string is invalid.
+ */
+export function parseCustomGasPrice (gasPrice: string): GasPrice {
+  // This regex allows the denom to start with an optional '$' followed by any
+  // alphanumeric character or ':', '.', '_', '-'. It must have at least one such character.
+  const matchResult = gasPrice.match(/^([0-9.]+)(\$?[a-zA-Z][a-zA-Z0-9/:._-]*)$/);
+
+  if (!matchResult) {
+    throw new Error('Invalid gas price string');
+  }
+
+  // eslint-disable-next-line @typescript-eslint/no-unused-vars
+  const [_, amount, denom] = matchResult;
+
+  // Basic denom length check (similar to checkDenom in @cosmjs/stargate)
+  if (denom.length < 2 || denom.length > 128) {
+    throw new Error('Denom must be between 2 and 128 characters');
+  }
+
+  const fractionalDigits = 18; // Standard for Cosmos SDK decimals
+  const decimalAmount = Decimal.fromUserInput(amount, fractionalDigits);
+
+  return new GasPrice(decimalAmount, denom);
+}

tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "es2016",
+    "module": "commonjs",
+    "outDir": "./dist",
+    "rootDir": "./src",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "declaration": true
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules", "dist"]
+}