build(js-legacy): upgrade TypeScript to 6.0 (#88)

Bump typescript to ^6.0.3 and adjust tsconfig for TS6 compatibility:
- set moduleResolution to node10 (Node alias removed in TS6)
- add ignoreDeprecations "6.0" for the renamed option
- pin lib/types explicitly so the default lib set is unaffected
- add rootDir to the cjs/esm build configs

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: clankmaxxing-clod

clients/js-legacy/package.json

@@ -72,7 +72,7 @@
         "ts-node": "^10.9.2",
         "tslib": "^2.8.1",
         "typedoc": "^0.28.19",
-        "typescript": "^5.7.2"
+        "typescript": "^6.0.3"
     },
     "prettier": "@solana/prettier-config-solana"
 }

clients/js-legacy/tsconfig.base.json

@@ -3,7 +3,10 @@
     "compilerOptions": {
         "target": "ESNext",
         "module": "ESNext",
-        "moduleResolution": "Node",
+        "moduleResolution": "node10",
+        "ignoreDeprecations": "6.0",
+        "lib": ["ES2020", "DOM"],
+        "types": ["node"],
         "esModuleInterop": true,
         "isolatedModules": true,
         "noEmitOnError": true,

clients/js-legacy/tsconfig.cjs.json

@@ -2,6 +2,7 @@
     "extends": "./tsconfig.base.json",
     "include": ["src"],
     "compilerOptions": {
+        "rootDir": "./src",
         "outDir": "lib/cjs",
         "target": "ES2016",
         "module": "CommonJS",

clients/js-legacy/tsconfig.esm.json

@@ -2,6 +2,7 @@
     "extends": "./tsconfig.base.json",
     "include": ["src"],
     "compilerOptions": {
+        "rootDir": "./src",
         "outDir": "lib/esm",
         "declarationDir": "lib/types",
         "target": "ES2020",

clients/js-legacy/tsconfig.json

@@ -3,6 +3,7 @@
     "include": ["src", "test"],
     "compilerOptions": {
         "noEmit": true,
-        "skipLibCheck": true
+        "skipLibCheck": true,
+        "types": ["node", "mocha"]
     }
 }