feat: add @opencode-ai/util package with utility functions

Author: thdxr

packages/util/package.json

@@ -0,0 +1,18 @@
+{
+  "name": "@opencode-ai/util",
+  "version": "0.0.0",
+  "private": true,
+  "type": "module",
+  "exports": {
+    "./*": "./src/*.ts"
+  },
+  "scripts": {
+    "typecheck": "tsc --noEmit"
+  },
+  "dependencies": {
+    "zod": "catalog:"
+  },
+  "devDependencies": {
+    "typescript": "catalog:"
+  }
+}

packages/util/src/fn.ts

@@ -0,0 +1,11 @@
+import { z } from "zod"
+
+export function fn<T extends z.ZodType, Result>(schema: T, cb: (input: z.infer<T>) => Result) {
+  const result = (input: z.infer<T>) => {
+    const parsed = schema.parse(input)
+    return cb(parsed)
+  }
+  result.force = (input: z.infer<T>) => cb(input)
+  result.schema = schema
+  return result
+}

packages/util/src/iife.ts

@@ -0,0 +1,3 @@
+export function iife<T>(fn: () => T) {
+  return fn()
+}

packages/util/src/lazy.ts

@@ -0,0 +1,11 @@
+export function lazy<T>(fn: () => T) {
+  let value: T | undefined
+  let loaded = false
+
+  return (): T => {
+    if (loaded) return value as T
+    loaded = true
+    value = fn()
+    return value as T
+  }
+}

packages/util/tsconfig.json

@@ -0,0 +1,14 @@
+{
+  "compilerOptions": {
+    "target": "ESNext",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "skipLibCheck": true,
+    "allowSyntheticDefaultImports": true,
+    "esModuleInterop": true,
+    "allowJs": true,
+    "noEmit": true,
+    "strict": true,
+    "isolatedModules": true
+  }
+}