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Copy pathobservabledecorator.ts
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42 lines (40 loc) · 1.73 KB
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import { defineObservableProperty } from "../types/observableobject"
import { fail } from "../utils/utils"
import { IEnhancer } from "../types/modifiers"
import { createPropDecorator, BabelDescriptor } from "../utils/decorators2"
export type IObservableDecorator = {
(target: Object, property: string, descriptor?: PropertyDescriptor): void
enhancer: IEnhancer<any>
}
export function createDecoratorForEnhancer(enhancer: IEnhancer<any>): IObservableDecorator {
const decorator = createPropDecorator(
true,
(
target: any,
propertyName: string,
descriptor: BabelDescriptor,
_decoratorTarget,
decoratorArgs: any[]
) => {
const initialValue = descriptor
? descriptor.initializer ? descriptor.initializer.call(target) : descriptor.value
: undefined
defineObservableProperty(target, 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
}