41 lines
1.3 KiB
TypeScript
41 lines
1.3 KiB
TypeScript
interface TypeMap {
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string: string
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number: number
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bigint: bigint
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boolean: boolean
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object: object
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symbol: symbol
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undefined: undefined
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}
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// Type predicate higher order function for use with e.g. filter or map
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export function isType<T extends keyof TypeMap>(type: T): (v: unknown) => v is TypeMap[T] {
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return (v: unknown): v is TypeMap[T] => typeof v === type
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}
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// Type predicate for object keys
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// Only safe for const objects, as other objects might carry additional, undeclared properties
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export function isKeyOfConstObject<T extends object>(key: string | number | symbol, obj: T): key is keyof T {
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return key in obj
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}
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// Use for exhaustiveness checks in switch/case
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export function assertTypeExhausted(v: never): never {
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throw new Error(`Type should be exhausted but is not. Value "${JSON.stringify(v)}`)
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}
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export function strCamelCaseToSnakeCase(str: string): string {
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return str
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.replace(/\B([A-Z][a-z])/g, ' $1')
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.toLowerCase()
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.trim()
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.replace(/\s+/g, '_')
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}
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export function strReverse(str: string): string {
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return str.split('').reverse().join('')
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}
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export function strTrimRight(str: string, char: string): string {
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return strReverse(strReverse(str).replace(new RegExp(`^[${char}]+`), ''))
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}
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