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Copy pathobservabledecorator.ts
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55 lines (53 loc) · 2.01 KB
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import {
BabelDescriptor,
IEnhancer,
asObservableObject,
createPropDecorator,
fail,
invariant
} from "../internal"
export type IObservableDecorator = {
(target: Object, property: string | symbol, descriptor?: PropertyDescriptor): void
enhancer: IEnhancer<any>
}
export function createDecoratorForEnhancer(enhancer: IEnhancer<any>): IObservableDecorator {
invariant(enhancer)
const decorator = createPropDecorator(
true,
(
target: any,
propertyName: string,
descriptor: BabelDescriptor | undefined,
_decoratorTarget,
decoratorArgs: any[]
) => {
if (process.env.NODE_ENV !== "production") {
invariant(
!descriptor || !descriptor.get,
`@observable cannot be used on getter (property "${propertyName}"), use @computed instead.`
)
}
const initialValue = descriptor
? descriptor.initializer
? descriptor.initializer.call(target)
: descriptor.value
: undefined
asObservableObject(target).addObservableProp(propertyName, initialValue, enhancer)
}
)
const res: any =
// Extra process checks, as this happens during module initialization
typeof process !== "undefined" && process.env && process.env.NODE_ENV !== "production"
? function observableDecorator() {
// This wrapper function is just to detect illegal decorator invocations, deprecate in a next version
// and simply return the created prop decorator
if (arguments.length < 2)
return fail(
"Incorrect decorator invocation. @observable decorator doesn't expect any arguments"
)
return decorator.apply(null, arguments)
}
: decorator
res.enhancer = enhancer
return res
}