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ServiceNow Fluent Development

Expert knowledge for authoring ServiceNow Fluent (.now.ts) metadata and TypeScript/JavaScript modules using the ServiceNow SDK.

Key Differences from Legacy ServiceNow

• Fluent = TypeScript DSL for metadata (.now.ts files)
• Use now-sdk for build/sync/install
• Type definitions in @types/servicenow via now-sdk dependencies
• Now.include() references external scripts; SDK objects from @servicenow/sdk/core
• Full-stack React apps via UiPage with client code in src/client/
• Flow/workflow automation available via @servicenow/sdk/automation
• Service Catalog, Email Notifications, Workspaces, and SLAs all supported as Fluent metadata

Core Principles

1. Verify APIs — use Context7 to confirm method signatures; never assume
2. Match field names exactly to @types/servicenow/schema/ (prevents duplicates on install)
3. Use parent constant properties (parent.$id, table.name) — never Now.ID[...] for references
4. Script content is not TypeScript — ServiceNow JavaScript follows its own conventions; do not apply TypeScript validation to it

Critical Patterns

Parent-Child References

// CORRECT
export const menu = ApplicationMenu({ $id: Now.ID['menu'], title: 'App' })
export const module = Record({ table: 'sys_app_module', data: { application: menu.$id } })

export const table = Table({ name: 'x_app_table', schema: {...} })
export const rule = BusinessRule({ table: table.name })

// WRONG — creates a new ID reference instead of pointing to the constant
data: { application: Now.ID['menu'] }

sys_app_module Field Rules

Script Patterns

// TypeScript module import (server-side) — compiled to .js
import { fn } from '../server/module.js'
BusinessRule({ script: fn })

// Now.include() for ServiceNow JavaScript — enables two-way sync
ClientScript({ script: Now.include('./script.client.js') })

// Inline ServiceNow JavaScript (NOT TypeScript)
ClientScript({ script: `function onLoad() { g_form.addInfoMessage('Hi'); }` })

// script tagged template literal
RestApi({ routes: [{ script: script`(function(req,res){ res.setBody({ok:true}) })(request,response)` }] })

Sync directives: @fluent-ignore, @fluent-disable-sync, @fluent-disable-sync-for-file — use sparingly with a comment explaining why.

Full-Stack React Architecture

src/fluent/ui-pages/page.now.ts         → UiPage({ html: htmlEntry, endpoint: 'x_app.do' })
src/fluent/script-includes/*.now.ts     → ScriptInclude with clientCallable: true
src/fluent/script-includes/*.server.js  → Class.create() with client-callable methods
src/client/index.html                   → <sdk:now-ux-globals>, <script src="./main.tsx" type="module">
src/client/main.tsx                     → ReactDOM.createRoot(root).render(<App />)
src/client/app.tsx                      → State, CRUD handlers, components
src/client/services/Service.ts          → GlideAjax or REST service layer
src/client/components/*.tsx             → UI components
src/client/global.d.ts                  → declare global { Window.g_ck, GlideAjax }

Third-party npm libraries (component kits, icons, charts, etc.) are supported — install via npm, import normally in client code, and Rollup bundles them automatically. See references/third-party-libraries.md for the full setup guide including CSS imports, context providers, and build-warning suppression.

GlideAjax vs REST API — Decision Guide

Default: Use GlideAjax for internal ServiceNow apps. See references/client-server-patterns.md for full implementation examples.

Development Workflow

1. Create Table in src/fluent/tables/*.now.ts
2. Create ScriptInclude in src/fluent/script-includes/*.now.ts (with clientCallable: true for GlideAjax)
3. Create UiPage in src/fluent/ui-pages/*.now.ts
4. Create src/client/index.html with <sdk:now-ux-globals>
5. Create src/client/main.tsx (React bootstrap) and src/client/app.tsx (state, handlers)
6. Create service layer in src/client/services/*.ts (GlideAjax or REST)
7. Create components in

Best Practices

• Naming: x_[vendor]_[app]_[name] for tables, snake_case fields, PascalCase exported constants
• Security: Use roles not broad permissions; gs.hasRole() in script-based ACLs; validate all input
• Performance: Async business rules for non-blocking ops; index queried fields; cache expensive ops
• Error handling: abortAction for validation failures; isValidRecord() after get(); gs.error() for logging
• Types: Use GlideRecord<'tablename'> generics in server modules; run for schema files

References

Load these files when you need detailed guidance on specific topics:

• references/client-server-patterns.md — Full GlideAjax and REST implementation code, React entry patterns, navigation module
• references/api-reference.md — All Fluent API objects: Table, BusinessRule, ClientScript, ScriptInclude, RestApi, UiPage, SPWidget, ATF Test, UiPolicy, ImportSet, EmailNotification, Workspace, Sla, helpers; ApplicationMenu + sys_app_module navigation modules with full link-type field matrix and examples
• references/build-workflow.md — now-sdk commands, now-sdk dependencies, tsconfig setup, #now: import alias, trustedModules, build behaviour, verification checklist
• references/troubleshooting.md — Common issues, GlideAjax error diagnosis, instance verification steps
• references/advanced-patterns.md — Record() usage, cross-scope module pattern, server-side logging, common ServiceNow script APIs (GlideRecord, g_form, gs, GlideAggregate)

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