Jon Staab
80 lines
2.2 KiB
TypeScript
80 lines
2.2 KiB
TypeScript
import {bech32, utf8} from "@scure/base"
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export const now = () => Math.round(Date.now() / 1000)
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export const nth = (i: number) => <T>(xs: T[]) => xs[i]
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export const first = <T>(xs: T[]) => xs[0]
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export const last = <T>(xs: T[]) => xs[xs.length - 1]
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export const prop = (k: string) => <T>(x: Record<string, T>) => x[k]
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export const identity = <T>(x: T) => x
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export const between = (low: number, high: number, n: number) => n > low && n < high
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export const flatten = <T>(xs: T[]) => xs.flatMap(identity)
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export const uniq = <T>(xs: T[]) => Array.from(new Set(xs))
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export const shuffle = <T>(xs: T[]): T[] => xs.sort(() => Math.random() > 0.5 ? 1 : -1)
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export const randomId = (): string => Math.random().toString().slice(2)
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export const isIterable = (x: any) => Symbol.iterator in Object(x)
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export const toIterable = (x: any) => isIterable(x) ? x : [x]
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export const stripProtocol = (url: string) => url.replace(/.*:\/\//, "")
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export const ensurePlural = <T>(x: T | T[]) => (x instanceof Array ? x : [x])
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export const groupBy = <T>(f: (x: T) => string, xs: T[]) => {
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const r: Record<string, T[]> = {}
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for (const x of xs) {
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const k = f(x)
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if (!r[k]) {
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r[k] = []
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}
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r[k].push(x)
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}
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return r
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}
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export const pushToKey = <T>(m: Record<string, T[]> | Map<string, T[]>, k: string, v: T) => {
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if (m instanceof Map) {
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const a = m.get(k) || []
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a.push(v)
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m.set(k, a)
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} else {
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m[k] = m[k] || []
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m[k].push(v)
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}
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return m
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}
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export const hexToBech32 = (prefix: string, url: string) =>
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bech32.encode(prefix, bech32.toWords(utf8.decode(url)), false)
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export const bech32ToHex = (b32: string) =>
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utf8.encode(bech32.fromWords(bech32.decode(b32, false).words))
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// https://github.com/microsoft/TypeScript/issues/4628#issuecomment-1147905253
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export type OmitStatics<T, S extends string> =
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T extends {new(...args: infer A): infer R} ?
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{new(...args: A): R}&Omit<T, S> :
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Omit<T, S>;
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// https://github.com/microsoft/TypeScript/issues/4628#issuecomment-1147905253
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export type OmitAllStatics<T extends {new(...args: any[]): any, prototype: any}> =
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T extends {new(...args: infer A): infer R, prototype: infer P} ?
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{new(...args: A): R, prototype: P} :
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never;
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