Conventions used

There are a number of text conventions used throughout this book.

Code in text: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "The newest version of Apollo Client comes with the useQuery Hook."

A block of code is set as follows:

if (loading) return 'Loading...';
if (error) return 'Error! ${error.message}';

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

mkdir src/client/apollo touch src/client/apollo/index.js

Any command-line input or output is written as follows:

mkdir src/client/components

Bold: Indicates a new term, an important word, or words that you see onscreen. For instance, words in menus or dialog boxes appear in bold. Here is an example: "In the top bar, you will find the Prettify button, which tidies your query so that it is more readable."

Tips or Important Notes

Appear like this.