Interface MeasurerProvider

The contract a per-environment measurer module must satisfy. The active default is resolved via the @sheetxl/sdk/font/FontMeasurer conditional export: browser -> canvas, node -> fontkit, default -> simple (the zero-dependency char counter, the only universally-safe fallback - never pull a native/node-only measurer through default).

Override the active measurer at runtime with setSharedMeasurer (e.g. force the simple measurer in unit tests), or at build time by aliasing the @sheetxl/sdk/font/FontMeasurer import in the bundler config.