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Conditional + annotation causes erroneous typing
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**TypeScript Version:** 33.9.4 & 4.0.0@beta
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**Search Terms:** Type annotation wrongly overrides generic with errors
**Code**
```ts
const createMatrix = <D extends number, T>(
dimensions: D,
initialValues: T | null = null
): Matrix<D, T> => {
const currentDimensionLength = dimensions;
const remainingDimensions = dimensions - 1;
const needsRecursion = remainingDimensions > 0;
const currentMatrix = Array(currentDimensionLength).fill(initialValues);
const finalMatrix = needsRecursion
? currentMatrix.map(() =>
createMatrix(remainingDimensions, initialValues)
)
: currentMatrix;
return finalMatrix as Matrix<D, T>;
};
```
```ts
type Matrix<D extends number, T> = D extends 1
? T[]
: D extends 2
? T[][]
: D extends 3
? T[][][]
: any[][][][];
```
**Expected behavior:**
Adding type annotations to variables should be compatible with the functions return signature, causing no type errors
**Actual behavior:**
Assigning an annotated variable to the return value of the function causes an error. The generic `T` is wrongly inferred to be _any of_ `array wh…
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