@dialstack/sdk-dev / js/src / formatWhileTyping

Function: formatWhileTyping()

TypeScript

function formatWhileTyping(raw, previous): string;

Defined in: sdk/js/src/utils/phone-input-format.ts:20

Format a single number field as it is typed.

Formatting applies to insertions only. A deletion is always literal — one keypress removes exactly the one character under the caret and nothing else. Rewriting during a deletion is what makes an input feel possessed: removing the x from 678-555-0199 x123 would also swallow the space, so the next press lands on a digit instead of where the reader was aiming.

Shared by both surfaces because these rules are subtle, the failure mode is a digit silently disappearing, and the two must behave identically.

Parameters

raw

string

previous

string

Returns

string