Proposal: Add an `isAnimated(val)` existential method

[lelandrichardson]

var Animated = require('animated');
var anim = new Animated.Value(123);
var interp = anim.interpolate({ ... });
Animated.isAnimated(anim) // true
Animated.isAnimated(interp) // true
Animated.isAnimated(123) // false

This would be a good API to provide people for detecting whether or not a given value is an animated value or not. This could be used, for example, to produce PropTypes helpers for the library.

[gre]

Big +1 for this

Le dim. 28 févr. 2016 17:47, Leland Richardson notifications@github.com a
écrit :

var Animated = require('animated');var anim = new Animated.Value(123);var interp = anim.interpolate({ ... });Animated.isAnimated(anim) // trueAnimated.isAnimated(interp) // trueAnimated.isAnimated(123) // false

This would be a good API to provide people for detecting whether or not a
given value is an animated value or not. This could be used, for example,
to produce PropTypes helpers for the library.

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#9.

[browniefed]

Yeah I think this is great, although it'll have to pair nicely with however we decide to move forward with custom animated values. Whether that is just extending AnimatedWithChildren or otherwise.

[lelandrichardson]

@browniefed i'm working on a proposal for that right now. Either way, it should work fine. The test would basically just check: value instanceof Animated, but Animated itself wouldn't be an exported class. However we create new animated shapes, they would inevitably inherit from Animated

[browniefed]

Tis what I figured 👍

[vjeux]

Really smart! I've been struggling to figure out how to encode that. Make it happen :)

[gre]

@lelandrichardson if Animated/AnimatedWithChildren is not exposed, how can a third party library implement his own Animated? Will the library expose ways to create an Animated class?
My use-case is animated over uniforms for gl-react: https://github.com/ProjectSeptemberInc/gl-react/blob/master/src/AnimatedData.js#L42

[lelandrichardson]

@gre can you weigh in on this PR? I'm curious if this would solve your use case. #12