Suggestion: a built-in TypedArray interface #15402
Description
I would have expected a TypedArray interface to exist in
the built-in declaration libraries. Instead, there are independent types for
Int8Array, etc, with no common base type.
interface Int8Array { /* ... */ }
interface Int8ArrayConstructor { /* ... */ }
declare const Int8Array: Int8ArrayConstructor;
interface Uint8Array { /* ... */ }
interface Uint8ArrayConstructor { /* ... */ }
declare const Uint8Array: Uint8ArrayConstructor;
// ...It seems sensible that there should be a common TypedArray type, both because
- a TypeScript user might want to declare a variable as a
TypedArray, and - it would reduce repetition in the built-in declaration files
interface TypedArray { /* ... */ }
interface Int8Array extends TypedArray { }
interface Int8ArrayConstructor { /* ... */ }
declare const Int8Array: Int8ArrayConstructor;
interface Uint8Array extends TypedArray { }
interface Uint8ArrayConstructor { /* ... */ }
declare const Uint8Array: Uint8ArrayConstructor;
// ...Is there a good reason why there is no TypedArray type? If not, I can submit a PR.
Use case
Consider the isTypedArray() function from lodash.
Currently, it is declared as follows:
function isTypedArray(value: any): boolean;This proposal would enable an appropriate type-guard, without declaring
a convoluted union type:
function isTypedArray(value: any): value is TypedArray;