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CONTENTS OF THIS FILE

• Introduction
• Requirements
• Installation
• Font Discovery
• Bad Declarations
• Generic Fonts
• Local Fonts
• Google Fonts
• Google Fonts Locally
• Font Roles
• Using Fonts
• Build Integration

INTRODUCTION

Provide functionality for both adding and managing fonts.

Fonts are declared in YAML by any module or theme, resolved into a plugin, and emitted as CSS through the Neo build pipeline. Each font is exposed as a .font-{selector} utility, and five semantic "roles" (primary, secondary, accent, heading, ui) can be pointed at any declared font from the admin UI.

REQUIREMENTS

This module requires Neo.

INSTALLATION

Install as you would normally install a contributed Drupal module. Visit https://www.drupal.org/node/1897420 for further information.

FONT DISCOVERY

Modules and themes can specify font definitions via a MODULE_THEME_NAME.neo.font.yml file placed in the root of the module/theme. Definitions are discovered and cached, so run drush cr after adding, editing, or removing one.

Every definition supports these top-level properties:

• family (required) The CSS font family name, e.g. "Inter".
• type (required) One of 'local', 'google' or 'generic'.
• generic For 'local'/'google', the id of a generic font whose stack is used as the fallback (e.g. 'sans'). For 'generic', the raw CSS fallback stack itself.
• selector The class suffix for the generated .font-{selector} utility. Defaults to the machine id. It must not be one of the five font role names — see Font Roles.
• faces (required for 'local') The @font-face definitions (see below).
• spec (for 'google') The Google Fonts css2 spec string.

BAD DECLARATIONS

One rule decides what a mistake in a declaration costs: can a font be built from what was written? If it cannot, the problem is a font declaration refusal. If it can, and only the author's expectation is wrong, it is a font declaration report.

Nothing throws at discovery. A refused font is logged at error on the neo_font logger channel — naming the declaring extension, the font key as the YAML spells it, and the reason — and is then dropped: it does not exist for the rest of the request, so there is no .font-{selector} utility for it, no @font-face rule, no entry in the Google link, no option on the settings form, and no role mapping for a role that named it. Every other font is unaffected and the page still renders, so a mistyped face path costs a font rather than the site. A report is logged at warning and the font is built normally.

Prepare is where a refusal is fatal. drush neo:build (and so npm run deploy) re-reads every declaration file and fails the build if any font cannot be built, listing every refusal it found in one message rather than the first — three wrong face paths take one build to find rather than three. A report does not fail the build. Discovery is cached, so a dropped font is logged once per cache rebuild rather than once per request: the log tells you after the fact, the build tells you now, which is why adding or editing a font is a build-time act.

The conditions currently refused are: no 'family'; no 'type'; a 'type' outside 'local', 'google' and 'generic'; a derived id equal to one of the five font role names; and, for a local font, a provider that is neither an installed module nor an installed theme, no 'faces', a face with no 'src', and a 'src' that is not on disk. The only report today is a 'selector' equal to a role name — see Font Roles.

GENERIC FONTS

Generic fonts define the fallback stacks that local and Google fonts point at via their 'generic' property. This module ships 'sans', 'serif', 'mono' and 'cursive'. Use 'cursive' when defining a script font. A generic definition sets 'generic' to the raw CSS stack rather than to another font id.

LOCAL FONTS

A local font definition looks as follows. The 'faces.weight', 'faces.style' and 'faces.unicode' properties are optional. Each 'faces.src' is resolved relative to the declaring module/theme and must exist on disk — a missing file drops that one font at discovery, logging the extension, the font and the full path the check looked at, and refuses the next build. See Bad Declarations. The 'generic' property should be set to one of the generic font ids ('sans', 'serif', 'mono' or 'cursive').

Additional optional face keys: 'format' (e.g. "woff2"), 'ascent-override', 'descent-override' and 'line-gap-override'. font-display defaults to 'swap'; to override it set a 'display' key on the face.

GOOGLE FONTS

Google fonts can be used. The 'spec' property can be found on the Google Fonts site when selecting a font. A Google font is loaded from the Google CDN via a stylesheet link added to the page head (with preconnect hints).

Please see Google Fonts Locally for a better way.

The 'selector' above is optional; it is set here so this CDN-served Inter gets its own .font-inter-cdn utility rather than colliding with the local Inter declared elsewhere.

GOOGLE FONTS LOCALLY

Although Google fonts can be loaded via CDN, the recommended approach is to serve those fonts locally. This avoids the extra request and gives full control over the @font-face declarations. Download the font, place the files in your module/theme, and declare it as a type: local font.

The following website helps to extract the CSS and font files:

https://variable-font-helper.web.app/

FONT ROLES

Five semantic roles are provided: primary, secondary, accent, heading and ui. Each role is mapped to a declared font on the settings page at Administration » Configuration » Neo » Fonts (/admin/config/neo/font, permission "administer neo_font"). The mapping is stored in neo_font.settings.

Roles let a theme reference an intent ("the heading font") rather than a specific font, so the underlying font can be swapped from the admin UI without touching templates or rebuilding assets.

Role names and font selectors share one namespace, so a font declaring a 'selector' equal to a role name writes the same key as that role and one of the two is silently lost. A selector matching a role name is reported as a warning in the log today and will be refused outright in a future release — rename the selector rather than relying on the current behaviour.

USING FONTS

Each declared font produces a .font-{selector} utility bound to that specific font (e.g. .font-inter). Each role produces a font-{role} utility (font-primary, font-heading, font-ui, …) that resolves to whichever font is currently assigned to that role via a CSS variable (--font-{role}-family).

Prefer role utilities in components so fonts stay swappable:

Use a .font-{selector} utility only when you need one specific font regardless of the role configuration.

BUILD INTEGRATION

Fonts are emitted through the Neo build (see the neo_build module):

• Font family utilities and role tokens are registered at build time, so adding a new font or a new .font-{selector} requires rebuilding the Neo assets (both the front and back scopes).
• @font-face rules and the --font-{role}-family variables are injected inline at runtime and are cache-tagged on neo_font.settings, so changing which font a role uses only requires a cache rebuild (drush cr) — no asset rebuild.