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@jsvision/core / isAsciiSafe

Function: isAsciiSafe() ​

isAsciiSafe(caps): boolean

Defined in: host/width-probe.ts:373

Whether a capability profile already renders as pure ASCII, so the width probe can be skipped with nothing to learn or swap. Pure.

True when UTF-8 output is off (every glyph above U+007F already becomes ?, and probing would only write raw UTF-8 to a non-UTF-8 terminal), or when the glyph flags are already fully degraded (box/half off, ambiguous-wide on).

Parameters ​

caps ​

CapabilityProfile

The capability profile to test.

Returns ​

boolean

True when the probe can be skipped with no loss of fidelity.

Example ​

ts
import { resolveCapabilities, isAsciiSafe, degradeCapsFully } from '@jsvision/core';

isAsciiSafe(resolveCapabilities().profile);         // typically false on a UTF-8 terminal
isAsciiSafe(degradeCapsFully(resolveCapabilities().profile)); // => true