エラー関連の改善およびエラークラスの細分化

AGENTS.md

@@ -7,6 +7,7 @@
     - Better Unicode variation selector (UVS) handling
     - Richer shaping controls
     - Vertical metrics accuracy
+    - Better error reporting
     - Predictable type definitions for consumers
 
 ## Repository Orientation
@@ -18,6 +19,9 @@
 
 ## Toolchain & Commands
 - Use Node 20+ and npm (repo ships `package-lock.json`). Install with `npm install`.
+- Two TypeScript configs ship with the repo:
+    - `tsconfig.json` configures editor tooling for the codebase. It enables `allowJs`, `strictNullChecks`, and decorators, but keeps `checkJs` disabled so files opt in via `// @ts-check`.
+    - `tsconfig-types.json` extends the base config and only emits declarations for `src/index.ts` and `src/node.ts` when running `npm run build:types`.
 - Fast feedback loop:
   - `npm run build:js` → Parcel build into `dist/`.
   - `npm run build:types` → `tsc --project tsconfig-types.json` (follows `src/index.ts` & `src/node.ts`, pulls in JS via `allowJs`).

MODIFICATIONS.md

@@ -2,20 +2,33 @@
 
 ## [Unreleased]
 
+### Feature/Dependency Removals
+
 - Remove WOFF format support
     - Also removing the `tiny-inflate` dependency (the indirect dependency may remain)
 - Remove WOFF2 format support
     - Also removing the `brotli` dependency
 - Remove DFont format support
-- Simplify the published TypeScript types by inlining the concrete format exports (`TTFFont`/`TrueTypeCollection`) in place of the old aliases (`Font`/`FontCollection`).
 - Remove the dependencies below by replacing them with new internal helpers (no API changes):
     - `clone` (used by `TTFSubset`)
     - `fast-deep-equal` (used by `CFFDict`)
 
+### Error Improvements
+
+- Replace generic `Error`s with new specific `FontkitError` subclasses
+- Fix some error messages
+- Rename table decode logging helpers from `logErrors`/`isLoggingErrors` to `logWarnings`/`isLoggingWarnings` and downgrade emitted messages to warnings
+
+### Other Changes
+
+- Simplify the published TypeScript types by inlining the concrete format exports (`TTFFont`/`TrueTypeCollection`) in place of the old aliases (`Font`/`FontCollection`).
+
+
 ## [2.0.4-mod.2025.2]
 
 - Improve performance of `CmapProcessor#lookupNonDefaultUVS` by caching variation selector records from `cmap` format 14 subtable
 
+
 ## [2.0.4-mod.2025.1]
 
 - Fix glyph mapping using the cmap format 14 subtable, improving support for UVS in methods like `TTFFont#glyphsForString`