chore: implementing improved peer dependency checks for pre-1.0 packages

Author: georgewrmarshall

yarn.config.cjs

@@ -613,10 +613,23 @@ function expectUpToDateWorkspacePeerDependencies(Yarn, workspace) {
           dependency.range,
         )
       ) {
+        // Ensure peer dependency includes latest breaking changes.
+        //
+        // Technically pre-1.0 versions can make breaking changes in patch releases, but
+        // conventionally we always bump the most significant digit for breaking changes.
+        let peerDependencyRange;
+        if (dependencyWorkspaceVersion.major > 0) {
+          peerDependencyRange = `^${dependencyWorkspaceVersion.major}.0.0`;
+        } else if (dependencyWorkspaceVersion.minor > 0) {
+          peerDependencyRange = `^0.${dependencyWorkspaceVersion.minor}.0`;
+        } else {
+          peerDependencyRange = `^0.0.${dependencyWorkspaceVersion.patch}`;
+        }
+
         expectWorkspaceField(
           workspace,
           `peerDependencies["${dependency.ident}"]`,
-          `^${dependencyWorkspaceVersion.major}.0.0`,
+          peerDependencyRange,
         );
       }
     }