ember-cached-decorator-polyfill
Polyfill for RFC 566 "@cached decorator".
Installation
ember install ember-cached-decorator-polyfill
For addons, pass the -S flag.
Compatibility
- Ember.js v3.13 or above
- Ember CLI v2.13 or above
- Node.js v10 or above
Summary
Add a @cached decorator for memoizing the result of a getter based onautotracking. In the following example, fullName would only recalculate iffirstName or lastName is updated.
import { tracked, cached } from '@glimmer/tracking';
class Person {
@tracked firstName = 'Jen';
@tracked lastName = 'Weber';
@cached
get fullName() {
return `${this.firstName} ${this.lastName}`;
}
}
For detailed usage instructions, refer to theRFC 566 "@cached decorator".
TypeScript Usage
TypeScript's normal type resolution for an import from @glimmer/trackingwill not find the types provided by this package (since TypeScriptwould attempt to resolve it as node_modules/@glimmer/tracking or underthe Definitely Typed location for @glimmer/tracking).
Once the addition to the @glimmer/tracking API is a documented part of Ember'sAPI, the types will be available upstream, but in the meantime users will needto modify their tsconfig.json to tell TypeScript where these types are.
Add the following to your tsconfig.json:
{
// ...snip...
"paths": {
// ...snip...
"@glimmer/tracking": [
"node_modules/ember-cached-decorator-polyfill",
"node_modules/@glimmer/tracking/dist/types"
],
}
}
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