Looking to develop a function that can handle duration strings like 12ms, 7.5 MIN, or 400H, and then convert them into milliseconds.
const units = {
MS: 1,
S: 1 * 1000,
MIN: 60 * 1 * 1000,
H: 60 * 60 * 1 * 1000
}
export function toMS(str: string): number {
let regex = /^(?<number>\d+(?:\.\d+)?)(?:\s*(?<unit>MS|S|MIN|H))?$/i
if (!regex.test(str)) {
throw new TypeError(`Expected a duration, got: ${str}`)
}
let match = str.match(regex)
let number = Number(match?.groups?.number)
let unit = (match?.groups?.unit || 'ms').toUpperCase()
return Math.floor(number * units[unit])
}The function toMS() validates the provided string format (number + optional whitespace + optional unit abbreviation) before parsing it with str.match(regex).
All is well until reaching units[unit], which triggers an error:
Element implicitly has an 'any' type because expression of type 'string' can't be used to index typePrior encounters with this type of error were resolved by enforcing types for function arguments and class constructors, but in this case where user input varies, finding a solution remains elusive. Forcing str.match(regex).groups.unit to conform to specific types such as : 'MS | S | MIN | H' seems unattainable.
While one route could involve creating an tsconfig.json file with "noImplicitAny": false, such an approach may not align with the current project requirements.