Ensure sharp.format.heif is AVIF-only for prebuilt binaries

docs/changelog.md

@@ -13,6 +13,9 @@ Requires libvips v8.15.2
   [#4111](https://github.com/lovell/sharp/pull/4111)
   [@project0](https://github.com/project0)
 
+* Ensure `sharp.format.heif` includes only AVIF when using prebuilt binaries.
+  [#4132](https://github.com/lovell/sharp/issues/4132)
+
 ### v0.33.4 - 16th May 2024
 
 * Remove experimental status from `pipelineColourspace`.

lib/utility.js

@@ -75,6 +75,13 @@ if (!libvipsVersion.isGlobal) {
 }
 versions.sharp = require('../package.json').version;
 
+/* istanbul ignore next */
+if (versions.heif && format.heif) {
+  // Prebuilt binaries provide AV1
+  format.heif.input.fileSuffix = ['.avif'];
+  format.heif.output.alias = ['avif'];
+}
+
 /**
  * Gets or, when options are provided, sets the limits of _libvips'_ operation cache.
  * Existing entries in the cache will be trimmed after any change in limits.