@pdfa-lab/fontkit / OpenTypeFont

Type Alias: OpenTypeFont

OpenTypeFont = OpenTypeTrueTypeFont | OpenTypePostScriptFont | OpenTypeNoOutlinesFont

Defined in: src/open-type-font.ts:202

The final Discriminated Union representing any upcast, structurally conformant OpenType font. You will usually get an object implementing the interface with Font.asOpenTypeFont.

Fonts that implement this interface, have all 8 core OpenType tables (@{link requiredOpenTypeTables}) present and successfully decoded.

You can discriminate the different sub types in your code like this:

const openTypeFont = font.asOpenTypeFont();

if (!openTypeFont) {
	// This font is a legacy font without the complete set of OpenType core
	// tables.
} else if (openTypeFont.outlines === 'TrueType') {
	// openTypeFont is now an OpenTypeTrueTypeFont in the scope of this branch.
	// All tables for TrueType outlines are guaranteed to be present.
} else if (openTypeFont.outlines === 'PostScript') {
 	// openTypeFont is now an OpenTypePostScriptFont in the scope of this branch.
	// All tables for PostScript outlines are guaranteed to be present.
} else if (openTypeFont.outlines === 'none') {
	// openTypeFont is now an OpenTypeNoOutlinesFont in the scope of this
	// branch. All 8 OpenType core tables are present.
}