# Code style guide

## Public APIs

- All public symbols (functions, types, constants) should be annotated with `@public`.
- Any types used in the **signature** of the exported symbol should also be exported.

Example:

```typescript
/**
 * @public
 */
export interface FooResult {
  foo: string;
}

/**
 * @public
 */
export function foo(): FooResult {}
```

- The main entry point of the module should explicitly list exported symbols:

```typescript
// Do 
export { foo, bar } from './foo';

// Don't
export * from './bar';
```

### Deprecating symbols

- Add `@deprecated` to the symbol JSDoc.
- Print warning to the console when the deprecated symbol is used.
- Add migration guide to the docs.

### Writing JSDocs

All public symbols must have JSDoc documentation.
It should be written in full sentences with proper punctuation.
Prefer to add newlines after sentences so that lines don't get too long.

- Use `@public` to mark public APIs.
- Use `@deprecated` to mark deprecated APIs.
- Use `@param name` to mark parameters.
- Don't specify parameter types in JSDoc as it is already specified in the function signature.
- Use `@returns` to provide documentation about return value.
- Use `{@link Foo}` to link to other symbols.

Example:

```typescript
/**
 * Makes a call to a specific method of a specific contract and returns the value or an error if present.
 * The hook will cause the component to refresh when a new block is mined and the return value changes.
 * A syntax sugar for useRawCall that uses ABI, function name, and arguments instead of raw data.
 * If typechain contract is used in call parameter then method name and arguments will be type checked.
 * Result will be typed as well.
 *
 * @public
 * @param call a single call to a contract, also see {@link Call}
 * @returns The hook returns {@link CallResult} type.
 *          That is: undefined when call didn't return yet or a object { value | error } if it did,
 *          value: any[] | undefined - array of results or undefined if error occurred,
 *          error: Error | undefined - encountered error or undefined if call was successful.
 * 
 */
export function useCall<T extends TypedContract, MN extends ContractMethodNames<T>>(
  call: Call<T, MN> | Falsy
): CallResult<T, MN> {
  return useCalls([call])[0]
}

```