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Improve is.infinite TypeScript type

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This commit is contained in:
Younho Choo 2022-01-17 20:21:21 +09:00
parent d2e65aa5b8
commit 7fbfce158e
2 changed files with 22 additions and 4 deletions
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8
source/index.ts
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@ -2,7 +2,7 @@
/// <reference lib="dom"/>
/// <reference types="node"/>
import {Class, TypedArray, ObservableLike, Primitive, Integer} from './types';
import {Class, TypedArray, ObservableLike, Primitive, Integer, PositiveInfinity, NegativeInfinity} from './types';
const typedArrayTypeNames = [
'Int8Array',
@ -334,7 +334,7 @@ export interface NodeStream extends NodeJS.EventEmitter {
is.nodeStream = (value: unknown): value is NodeStream => is.object(value) && is.function_((value as NodeStream).pipe) && !is.observable(value);
is.infinite = (value: unknown): value is number => value === Infinity || value === -Infinity;
is.infinite = (value: unknown): value is NegativeInfinity | PositiveInfinity => value === Infinity || value === -Infinity;
const isAbsoluteMod2 = (remainder: number) => <T extends number>(value: T): value is Integer<T> => is.integer(value) && Math.abs(value % 2) === remainder;
is.evenInteger = isAbsoluteMod2(0);
@ -517,7 +517,7 @@ interface Assert {
domElement: (value: unknown) => asserts value is HTMLElement;
observable: (value: unknown) => asserts value is ObservableLike;
nodeStream: (value: unknown) => asserts value is NodeStream;
infinite: (value: unknown) => asserts value is number;
infinite: (value: unknown) => asserts value is NegativeInfinity | PositiveInfinity;
emptyArray: (value: unknown) => asserts value is never[];
nonEmptyArray: (value: unknown) => asserts value is unknown[];
emptyString: (value: unknown) => asserts value is '';
@ -618,7 +618,7 @@ export const assert: Assert = {
domElement: (value: unknown): asserts value is HTMLElement => assertType(is.domElement(value), AssertionTypeDescription.domElement, value),
observable: (value: unknown): asserts value is ObservableLike => assertType(is.observable(value), 'Observable', value),
nodeStream: (value: unknown): asserts value is NodeStream => assertType(is.nodeStream(value), AssertionTypeDescription.nodeStream, value),
infinite: (value: unknown): asserts value is number => assertType(is.infinite(value), AssertionTypeDescription.infinite, value),
infinite: (value: unknown): asserts value is NegativeInfinity | PositiveInfinity => assertType(is.infinite(value), AssertionTypeDescription.infinite, value),
emptyArray: (value: unknown): asserts value is never[] => assertType(is.emptyArray(value), AssertionTypeDescription.emptyArray, value),
nonEmptyArray: (value: unknown): asserts value is unknown[] => assertType(is.nonEmptyArray(value), AssertionTypeDescription.nonEmptyArray, value),
emptyString: (value: unknown): asserts value is '' => assertType(is.emptyString(value), AssertionTypeDescription.emptyString, value),

18
source/types.ts
View file

@ -68,3 +68,21 @@ declare function setYear<T extends number>(length: Integer<T>): void;
// `${bigint}` is a type that matches a valid bigint literal without the `n` (ex. 1, 0b1, 0o1, 0x1)
// Because T is a number and not a string we can effectively use this to filter out any numbers containing decimal points
export type Integer<Type extends number> = `${Type}` extends `${bigint}` ? Type : never;
/**
Matches the hidden `Infinity` type.
Please upvote [this issue](https://github.com/microsoft/TypeScript/issues/32277) if you want to have this type as a built-in in TypeScript.
@see NegativeInfinity
@category Numeric
*/
// See https://github.com/microsoft/TypeScript/issues/31752
export type PositiveInfinity = 1e999;
/**
Matches the hidden `-Infinity` type.
Please upvote [this issue](https://github.com/microsoft/TypeScript/issues/32277) if you want to have this type as a built-in in TypeScript.
@see PositiveInfinity
@category Numeric
*/
// See https://github.com/microsoft/TypeScript/issues/31752
export type NegativeInfinity = -1e999;