Error: Type cannot be used to index type after two indexes
See original GitHub issueTypeScript Version: 2.7.1, 2.8.0-dev.20180208
Search Terms: Type cannot be used to index type
Code
interface IExample {
foo: {
bar: {
baz: number;
}
}
}
type F = <
name extends keyof IExample,
val extends keyof IExample[name]
>() => IExample[name][val]['baz']; // ← Type '"baz"' cannot be used to index type 'IExample[name][val]'.
Expected behavior: In version 2.7.0-dev.20171115 this code was checking without errors.
Actual behavior: Now in throws error: Type ‘“baz”’ cannot be used to index type ‘IExample[name][val]’.
Issue Analytics
- State:
- Created 6 years ago
- Reactions:19
- Comments:12 (4 by maintainers)
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Actually, it’s really weird! I’m getting type errors, but TS is getting the derived type right anyway!
ERROR in node_modules/@amcharts/amcharts4/.internal/charts/types/XYChart.d.ts(258,33): error TS2344: Type ‘this[“_xAxisRendererType”]’ does not satisfy the constraint ‘AxisRenderer’. Type ‘AxisRendererX’ is not assignable to type ‘AxisRenderer’. Types of property ‘events’ are incompatible. Type ‘SpriteEventDispatcher<AMEvent<AxisRendererX, IAxisRendererXEvents>>’ is not assignable to type ‘SpriteEventDispatcher<AMEvent<this[“_xAxisRendererType”], this[“_xAxisRendererType”][“_events”]>>’. Type ‘AMEvent<AxisRendererX, IAxisRendererXEvents>’ is not assignable to type ‘AMEvent<this[“_xAxisRendererType”], this[“_xAxisRendererType”][“_events”]>’. node_modules/@amcharts/amcharts4/.internal/charts/types/XYChart.d.ts(264,33): error TS2344: Type ‘this[“_yAxisRendererType”]’ does not satisfy the constraint ‘AxisRenderer’. Type ‘AxisRendererY’ is not assignable to type ‘AxisRenderer’. Types of property ‘events’ are incompatible. Type ‘SpriteEventDispatcher<AMEvent<AxisRendererY, IAxisRendererYEvents>>’ is not assignable to type ‘SpriteEventDispatcher<AMEvent<this[“_yAxisRendererType”], this[“_yAxisRendererType”][“_events”]>>’. Type ‘AMEvent<AxisRendererY, IAxisRendererYEvents>’ is not assignable to type ‘AMEvent<this[“_yAxisRendererType”], this[“_yAxisRendererType”][“_events”]>’. node_modules/@amcharts/amcharts4/.internal/charts/types/XYChart.d.ts(503,31): error TS2344: Type ‘this[“_xAxisRendererType”]’ does not satisfy the constraint ‘AxisRenderer’. node_modules/@amcharts/amcharts4/.internal/charts/types/XYChart.d.ts(513,31): error TS2344: Type ‘this[“_yAxisRendererType”]’ does not satisfy the constraint ‘AxisRenderer’. node_modules/@amcharts/amcharts4/.internal/core/utils/Object.d.ts(60,117): error TS2536: Type ‘Key’ cannot be used to index type ‘Object’. node_modules/@amcharts/amcharts4/.internal/core/utils/Object.d.ts(67,109): error TS2536: Type ‘Key’ cannot be used to index type ‘Object’. node_modules/@amcharts/amcharts4/.internal/core/utils/Object.d.ts(76,116): error TS2536: Type ‘Key’ cannot be used to index type ‘Object’. node_modules/@amcharts/amcharts4/.internal/core/utils/Type.d.ts(25,32): error TS2304: Cannot find name ‘Extract’.
Please… Help Me…