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Essential Angular

You're reading from   Essential Angular Fast paced guide to Front-end web development with Angular

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Product type Paperback
Published in May 2017
Publisher Packt
ISBN-13 9781788293761
Length 108 pages
Edition 1st Edition
Tools
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Authors (3):
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Narwhal Technologies Inc Narwhal Technologies Inc
Author Profile Icon Narwhal Technologies Inc
Narwhal Technologies Inc
Jeff Cross Jeff Cross
Author Profile Icon Jeff Cross
Jeff Cross
Victor Savkin Victor Savkin
Author Profile Icon Victor Savkin
Victor Savkin
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Toc

Trade-offs

Since AOT is so advantageous, we recommend to use it in production. But, as with everything, there are trade-offs. For Angular to be able to compile your application ahead of time, the metadata has to be statically analyzable. For instance, the following code will not work in the AOT mode:

@Component({
selector: 'talk-cmp',
template: () => window.hide ? 'hidden' : `
{{talk.title}} {{talk.speaker}}
Rating: {{ talk.rating | formatRating }}
<watch-button [talk]="talk"></watch-button>
<rate-button [talk]="talk" (click)="onRate()"></rate-button>
`
})
class TalkCmp {
//...
}

The window.hide property will not be defined. So the compilation will fail to point out the error. A lot of work has been done to make the compiler smarter, so it can understand most of the day-to-day patterns you would use when building your application...

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