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

CodeInText: 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: "TypeScript has a special keyword called interface, which doesn't exist in ECMAScript."

A block of code is set as follows:

interface ICar {
    make: string;
    model: string;
    year: number;
    vin?: string;
}

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

@Component({
    ...
})
export class AppComponent {
    ...

    handleToggleCard(id: number) {
        const flash = this.flashs.find(flash => flash.id === id);
        flash.show = !flash.show;
    }
}

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

> yarn add bootstrap-scss

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "Afterward, we need to go to the Audits tab in developer tools, as follows."