Text Measurement

pom uses opentype.js with bundled Noto Sans JP fonts to measure text width and determine line break positions. This approach works consistently across all Node.js environments, including serverless platforms like Vercel or AWS Lambda.

textMeasurement Option

You can specify the text measurement method using the textMeasurement option if needed:


const pptx = await buildPptx(
  xml,
  { w: 1280, h: 720 },
  {
    textMeasurement: "auto", // "opentype" | "fallback" | "auto"
  },
);

Value	Description
`"opentype"`	Always use opentype.js for text width measurement (default)
`"fallback"`	Always use fallback calculation (CJK characters = 1em, alphanumeric = 0.5em estimated)
`"auto"`	Use opentype.js (same as “opentype”, default)

Recommended Settings

All environments: Default ("auto") works fine - bundled fonts ensure consistent results
Reduced bundle size: Use "fallback" if you want to avoid loading bundled fonts (less accurate but smaller bundle)