no-unused-prop-types does not recognize use of prop inside Array.map()

[ghost]

In the following example, no-unused-prop-types will flag a non-use of arrayOfObjWithFoo.*.foo:

    static PropTypes = {
      arrayOfObjWithFoo: PropTypes.arrayOf(
        PropTypes.shape({ foo: PropTypes.string.isRequired })
      ).isRequired
    };

    render() {
      const fooItems = this.props.arrayOfObjWithFoo.map(objWithFoo => {
        <Item foo={objWithFoo.foo} />
      });
    }

[EvHaus]

Duplicate of #871.

The no-unused-prop-types rule does not support shape props at the moment as such detection is very difficult. If you use shape props, I recommend setting the skipShapeProps option to true on the rule.

[ljharb]

Again, this is still a bug. If it doesn't support shape props, it should not warn on them at all.

[EvHaus]

If you set the skipShapeProps option to true, it should stop warning on all shape props. Is that not working?

[ljharb]

I'm saying that if that option is required for the rule to be usable when using shapes, then the rule should never check shapes.

[EvHaus]

@ljharb That's a valid point. I'll look into whether or not it makes sense to set skipShapeProps to true as a default.

[merlinstardust]

I agree that skipShapeProps should default to true if it can't properly detect usage of props in shape.

The current behavior contradicts the forbid-prop-types rule since that encourages the use of shape instead of object.

[ljharb]

@EvNaverniouk any progress here?

[EvHaus]

@ljharb Just took a few minutes now to look into this but wasn't able to get far. This issue is talking about 2 things:

1. The code snippet @smsenesac originally posted is supposedly throwing an error when it shouldn't.
   I cannot reproduce the failure. I added a test for this here: EvHaus@15e2fd8 but the test isn't failing for me. So I wonder if maybe this has already been fixed in another commit.
2. Setting skipShapeProps to true by default.
   This is already done. See latest master code here: https://github.com/yannickcr/eslint-plugin-react/blob/master/lib/rules/no-unused-prop-types.js#L51

Don't think there are any further action items on this issue. Can we close?

[ljharb]

Seems reasonable.