Cannot parse Flow $Shape

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
45/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
javascript
Domain
documentation, tooling

Research direction

Reproduce the failure with the provided components/Label.js example and inspect react-docgen's Flow parsing entry points; no source file or test is named in the issue. Done means parsing the $Shape-wrapped props and returning the props metadata shown for the unwrapped type, with coverage for this example.

Written by the indexing model from the issue text.

Description

flow help wanted improvement

I don't know whether this applies to all Flow utility types in general, but React makes extensive use of $Shape (and so do we!) - react-docgen (3.0.0-rc.1) seems to fail at parsing this.

Example component props:

// components/Label.js
type Props = $Shape<{
	/** Content to place inside .ui.label element */
	children?: React.Node,
	/** Classes for .ui.label element */
	classes?: string,
	/** Type of the label (icon, favicon, image, notification, state) */
	type?: 'icon' | 'favicon' | 'image' | 'notification' | 'state',
	/** Tooltip (data-content, data-position, data-delay) */
	tooltip?: Tooltip
}>;

With $Shape:

{
    "displayName": "Label",
    "methods": []
}

Without $Shape:

{
	"displayName": "Label",
	"methods": [],
	"props": {
		"children": {
			"required": false,
			"flowType": {
				"name": "ReactNode",
				"raw": "React.Node"
			},
			"description": "Content to place inside .ui.label element"
		},
		"classes": {
			"required": false,
			"flowType": {
				"name": "string"
			},
			"description": "Classes for .ui.label element"
		},
		"type": {
			"required": false,
			"flowType": {
				"name": "union",
				"raw": "'icon' | 'favicon' | 'image' | 'notification' | 'state'",
				"elements": [
					{
						"name": "literal",
						"value": "'icon'"
					},
					{
						"name": "literal",
						"value": "'favicon'"
					},
					{
						"name": "literal",
						"value": "'image'"
					},
					{
						"name": "literal",
						"value": "'notification'"
					},
					{
						"name": "literal",
						"value": "'state'"
					}
				]
			},
			"description": "Type of the label (icon, favicon, image, notification, state)"
		},
		"tooltip": {
			"required": false,
			"flowType": {
				"name": "Tooltip"
			},
			"description": "Tooltip (data-content, data-position, data-delay)"
		}
	}
}
Dominant language
TypeScript
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Merged PRs (30d)
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