Implement WebResult

.gitignore

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+.idea/
+._*
+.DS_Store
+bun.lockb
+package-lock.json
+node_modules/

index.test.ts

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+import {expect, test} from 'bun:test'
+
+import {WebResult} from './index'
+
+test('base case Ok', () => {
+    const value = 'test'
+
+    const res = WebResult.ok(value)
+
+    const handler = (code: number) => {
+        throw "Shouldn't happen"
+    }
+    expect(res.as_response(handler)).toBe(value)
+})
+
+test('base case Error', () => {
+    const value = 12
+
+    const res = WebResult.error<never>(value)
+
+    const handler = (code: number) => {
+        expect(code).toBe(value)
+        return 'OK'
+    }
+    expect(res.as_response(handler)).toBe('OK')
+})

index.ts

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+import {Result, State} from 'result'
+export {State} from 'result'
+
+// @ts-expect-error
+export class WebResult<T> extends Result<T, number> {
+    public constructor(
+        _data: T | number,
+        _state: State,
+    ) {
+        super(_data, _state)
+    }
+
+    public static ok<T, U>(data: T) : WebResult<T> {
+        return new WebResult<T>(data, State.OK)
+    }
+    public static error<T>(code: number) : WebResult<T> {
+        return new WebResult<T>(code, State.ERROR)
+    }
+
+    public as_response<V>(error: (code: number) => V) : T | V {
+        if (this.state() === State.OK) {
+            // @ts-expect-error
+            return this._data
+        }
+
+        // @ts-expect-error
+        return error(this._data)
+    }
+}

package.json

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+{
+  "name": "webresult",
+  "description": "Extension of Result with a web specific error type",
+  "version": "1.0.0",
+
+  "author": "Pascal Perrenoud <pascal@pband.ch>",
+
+  "module": "index.ts",
+  "type": "module",
+  "files": ["index.ts"],
+
+  "scripts": {
+    "test": "bun test"
+  },
+
+  "dependencies": {
+    "result": "git+https://git.pband.ch/typescript/result.git"
+  },
+  "devDependencies": {
+    "@types/bun": "^1.1.2"
+  },
+  "peerDependencies": {
+    "typescript": "^5.0.0"
+  }
+}

tsconfig.json

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+{
+  "compilerOptions": {
+    // Enable latest features
+    "lib": ["ESNext"],
+    "target": "ESNext",
+    "module": "ESNext",
+    "moduleDetection": "force",
+    "allowJs": true,
+    "checkJs": true,
+
+    // Bundler mode
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "noEmit": true,
+
+    // Best practices
+    "strict": true,
+    "skipLibCheck": true,
+    "noFallthroughCasesInSwitch": true,
+
+    // Some stricter flags (disabled by default)
+    "noUnusedLocals": false,
+    "noUnusedParameters": false,
+    "forceConsistentCasingInFileNames": true,
+    "noPropertyAccessFromIndexSignature": false
+  },
+
+  "include": [
+    "index.ts"
+  ]
+}