ZacharyZhang-NY
e74dafcd36
Three independently ugly bugs that all fed the same log flood:
* Electron's `WebFrameMain.send` writes every "Render frame was disposed"
to stderr via `console.error`. When the worker fans a second
agent-event past a reloading renderer, we produced thousands of
identical lines and stalled the main loop on stderr I/O. Added a
`mainFrame.detached` guard so the send is short-circuited before
Electron's own catch block fires, and installed a targeted filter in
`suppress-warnings.ts` (now actually imported from the entry point)
so the specific `console.error("Error sending from webFrameMain:"…)`
noise never reaches the terminal. Any other payload still surfaces.
* `dispatchAgentMessage` accepted the human-reader sentinel as a wake
target when an agent replied to `__board__` — `wakeAgentIfPossible`
then called `db.getAgent("__board__")`, threw, and the dispatcher
kept repeating on every send. Strip `HUMAN_SENDER_ID` at
`resolveMessageWakeTargets`, and keep a defense-in-depth guard in the
heartbeat so a stray caller (future automation fan-out) cannot
reintroduce the crash.
* Pi's skills loader rejects any SKILL.md whose frontmatter `name`
diverges from its parent directory. The four bundled `my-writing-style`
copies declared `name: writing-style-skill`, so every install emitted
a warning and dropped the skill. They also lived as orphan gitlinks
(mode 160000 without .gitmodules), and the global `*.md` gitignore
hid every other SKILL.md from version control. Fixed the frontmatter
to match the dir, converted the dangling submodules to plain trees,
and allowlisted `builtin-skills/**/*.md` so a fresh clone carries the
catalogue instead of silently losing it.
101 lines
2.4 KiB
Markdown
101 lines
2.4 KiB
Markdown
---
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title: Use Value Objects for Domain Concepts
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impact: HIGH
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impactDescription: eliminates primitive obsession, enforces constraints
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tags: entity, value-objects, domain, types
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---
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## Use Value Objects for Domain Concepts
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Replace primitive types with value objects that encapsulate validation and behavior. Value objects are immutable, compared by value, and self-validating.
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**Incorrect (primitive obsession):**
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```typescript
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class Customer {
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constructor(
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public id: string,
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public email: string,
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public phone: string,
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public postalCode: string
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) {}
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changeEmail(newEmail: string): void {
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// Validation scattered or missing
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if (!newEmail.includes('@')) {
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throw new Error('Invalid email')
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}
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this.email = newEmail
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}
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}
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// Callers can pass any string
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const customer = new Customer('123', 'not-an-email', '123', 'invalid')
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```
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**Correct (value objects for domain concepts):**
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```typescript
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class Email {
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private constructor(private readonly value: string) {}
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static create(value: string): Email {
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if (!Email.isValid(value)) {
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throw new InvalidEmailError(value)
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}
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return new Email(value.toLowerCase())
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}
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private static isValid(value: string): boolean {
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return /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(value)
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}
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equals(other: Email): boolean {
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return this.value === other.value
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}
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toString(): string {
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return this.value
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}
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}
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class PhoneNumber {
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private constructor(
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private readonly countryCode: string,
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private readonly number: string
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) {}
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static create(countryCode: string, number: string): PhoneNumber {
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// Validation and normalization
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return new PhoneNumber(countryCode, number.replace(/\D/g, ''))
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}
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}
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class Customer {
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constructor(
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public readonly id: CustomerId,
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private email: Email,
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private phone: PhoneNumber
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) {}
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changeEmail(newEmail: Email): void {
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this.email = newEmail // Already validated
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}
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}
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// Compile-time type safety + runtime validation
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const customer = new Customer(
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CustomerId.create('123'),
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Email.create('user@example.com'),
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PhoneNumber.create('+1', '555-1234')
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)
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```
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**Benefits:**
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- Invalid values cannot exist in the system
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- Domain concepts explicitly named in code
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- Validation logic centralized and reusable
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- Type system prevents mixing up string parameters
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Reference: [Value Object Pattern](https://martinfowler.com/bliki/ValueObject.html)
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