Flow type workers #4903
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Flow type workers #4903
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jfirebaugh
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| */ | ||
| constructor(coord, size, sourceMaxZoom) { | ||
| constructor(coord: any, size: number, sourceMaxZoom: number) { |
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should this be coord: TileCoord?
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This was a rough pass; for many types I just used any where flow would otherwise complain. tile_coord.js hasn't been typed yet.
src/source/tile.js
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| this.state = 'loading'; | ||
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| this.placementThrottler = new Throttler(300, this._immediateRedoPlacement.bind(this)); | ||
| } | ||
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| registerFadeDuration(animationLoop, duration) { | ||
| registerFadeDuration(animationLoop: any, duration: any) { |
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why not duration: number?
src/source/worker.js
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| workerSources: { [string]: { [string]: WorkerSource } }; | ||
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| constructor(self: WorkerGlobalScope) { | ||
| this.self = (self: any); |
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👍 I don't see a cleaner way to do this. Could we stick a // comment here explaining the cast to any?
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Yeah, would be nice if Object.assign(self, {registerWorkerSource: ..., registerRTLTextPlugin: ...}) worked, but it doesn't. I'll comment.
src/symbol/collision_tile.js
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| @@ -91,7 +119,7 @@ class CollisionTile { | |||
| ]; | |||
| } | |||
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| serialize(transferables) { | |||
| serialize(transferables /*: ?Array<Transferable> */): SerializedCollisionTile { | |||
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Why a comment for the parameter type?
anandthakker
approved these changes
Jun 28, 2017
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This adds flow annotations to the majority of the
Worker-related code. I started on #4876, wanted to make some refactors, and realized that it would be better to have the safety of some static type checking as I did.The first commit here switches the eslint
sourceTypeoption tomodule, so that we can use module types without resorting to flow comments.Q: Why not use flow comments?
A: They're ugly, and they're not as good as native type annotations: not syntax highlighted, not linted (e.g. no warnings if you import something and don't use it), no documentation.js support, no IDE integration.
Q: What are the side effects of
"sourceType": "module"?A: AFAICT, it doesn't force us to actually use non-type
import/exportrather than CommonJSrequire, it just means that we can't'use strict'in each file -- this is enforced by eslint because modules are always strict. I worked around this by writing a simplestrictifytransform that puts them back in. (I didn't use the published one because it's buggy and unmaintained.)Q: Shouldn't you be able to use
import typewithout requiring"sourceType": "module"?A: Yes, I think you should be. If you agree, 👍 this bug.
Beyond that, the eslint + flow combo pretty much works. The only issue I've found is that eslint chokes on unnamed parameters in function types. So just name them:
Works
Doesn't Work