message: Update code_style.md
  Remove invalid single quotes item
  Add TypeScript section
  Add item regarding React function components and hooks
diff: @@ -35,12 +35,6 @@ General Style
  - lowerCamelCase for functions and variables.
  - Single line ternary operators are fine.
  - UPPER_SNAKE_CASE for constants
  -- Single quotes for strings by default, for consistency with most JavaScript styles:
  -
  - ```javascript
  - "bad" // Bad
  - 'good' // Good
  - ```
  - Use parentheses or `` ` `` instead of `\` for line continuation where ever possible
  - Open braces on the same line (consistent with Node):
  @@ -164,6 +158,14 @@ ECMAScript
  - Apart from that, newer ES features should be used whenever the author deems them to be appropriate.
  - Flow annotations are welcome and encouraged.
  +TypeScript
  +----------
  +- TypeScript is preferred over the use of JavaScript
  +- Its desirable to convert existing JavaScript files to TypeScript. TypeScript conversions should be done in small
  + chunks without functional changes to ease the review process.
  +- Use full type definitions for function parameters and return values.
  +- Avoid `any` types and `any` casts
  +
  React
  -----
  - Pull out functions in props to the class, generally as specific event handlers:
  @@ -201,6 +203,8 @@ React
  this.state = { counter: 0 };
  }
  ```
  +- Prefer class components over function components and hooks (not a strict rule though)
  +
  - Think about whether your component really needs state: are you duplicating
  information in component state that could be derived from the model?
  