Custom Schematics: An Angular Application by the push of a Button with the CLI's code generator

Slides from my talk at ngVikings in Helsinki, March 2018.

# Source Code:
- https://github.com/manfredsteyer/schematics-ngVikings-2018
- https://www.npmjs.com/package/angular-crud

Transcript

1. ManfredSteyer Custom Schematics and CLI: An Angular Application by the push of a Button Manfred Steyer SOFTWAREarchitekt.at ManfredSteyer
2. ManfredSteyer About me… • Manfred Steyer • Blog: SOFTWAREarchitekt.at • Angular Trainings and Consultancy • Google Developer Expert (GDE) Page ▪ 3 Manfred Steyer
3. ManfredSteyer Have you ever tried to … … setup a modern JavaScript project manually? • Compiler/ Transpiler • Package manager and packages • Build chain optimized for bundle size, performance, etc. • Testing tools including code coverage • Linting tools
4. ManfredSteyer Angular CLI
5. ManfredSteyer Using the CLI ng new my-project cd my-project ng generate component my-component
6. ManfredSteyer Vision ng new my-project --collection my-kick-a**-templ cd my-project ng generate my:menu-component side-menu
7. ManfredSteyer Contents • What is Schematics? • How to create custom schematics? • How to use parameters? • How to use templates? • How to scaffold whole projects?
8. ManfredSteyer What is Schematics?
9. ManfredSteyer Schematics Scaffolding Tool used by Angular CLI Schematics: The whole project Schematic: Code Generator Collection: Set of Schematics
10. ManfredSteyer Angular Labs Experimental :: Breaking Changes ahead Give it a try!
11. ManfredSteyer Nrwl Nx
12. ManfredSteyer
13. ManfredSteyer Schematics are atomic (like db transactions) A B D E C F A B D E C F Your Project Staging Area Tree Object
14. ManfredSteyer Schematics are atomic (like db transactions) A B D E C F A B D' E C F Your Project Staging Area Tree Object
15. ManfredSteyer Schematics are atomic (like db transactions) A B D E C F A B D' E C F G Your Project Staging Area Tree Object
16. ManfredSteyer Schematics are atomic (like db transactions) A B D E C F A B D' E C F G Your Project Staging Area Tree Object
17. ManfredSteyer Schematics are atomic (like db transactions) A B D' E C F G A B D' E C F G Your Project Staging Area Tree Object
18. ManfredSteyer How to Create Custom Schematics?
19. ManfredSteyer You can create a schematic … … with a schematic!
20. ManfredSteyer Scaffold Collection npm install -g @angular-devkit/schematics-cli schematics blank --name=hello-world schematics schematic --name=hello-world Contains sample schematics
21. ManfredSteyer
22. ManfredSteyer Surviving Schematics: Rule 1 ;-) "devDependencies": { "@angular-devkit/core": "0.0.29", "@angular-devkit/schematics": "0.0.52", "@schematics/angular": "0.1.17", […] } Use the same versions as your CLI-generated project! + npm install Versions used in CLI 1.6.8
23. ManfredSteyer Project Structure Schematic Rule- Factory
24. ManfredSteyer Rule Factory export function helloWorld(options: any): Rule { […] }
25. ManfredSteyer Rule Factory export function helloWorld(options: any): Rule { return (tree: Tree, _context: SchematicContext) => { _context.logger.debug('Manfred was here!'); tree.create('hello.txt', 'Hello World!'); return tree; }; } Rule
26. ManfredSteyer Testing npm run build schematics .:hello-world
27. ManfredSteyer Testing in Demo App npm install hello-world or npm link ..\hello-world schematics hello-world:hello-world
28. ManfredSteyer Testing in Demo App npm install hello-world or npm link ..\hello-world ng generate hello-world:hello-world
29. ManfredSteyer DEMO
30. ManfredSteyer How to use Parameters?
31. ManfredSteyer Case Study
32. ManfredSteyer Result Optional
33. ManfredSteyer Execution ng g nav:menu side-menu --menu-service
34. ManfredSteyer Project Structure Parameters Rule- Factory
35. ManfredSteyer Option Class in schema.ts export interface MenuOptions { name: string; appRoot: string; path: string; sourceDir: string; menuService: boolean; […] } provided by the CLI custom stuff
36. ManfredSteyer Rule Factory gets Parameter Object export default function (options: MenuOptions): Rule { return (host: Tree, context: SchematicContext) => { […] } }
37. ManfredSteyer Rule Factory gets Parameter Object export default function (options: MenuOptions): Rule { return (host: Tree, context: SchematicContext) => { […] } }
38. ManfredSteyer How to use Templates?
39. ManfredSteyer Project Structure
40. ManfredSteyer Template export interface <%= classify(name) %>Item { title: string; iconClass: string; } passed property passed function
41. ManfredSteyer Template names are templates! passed property passed property passed function
42. ManfredSteyer Rule calling Templates export default function (options: MenuOptions): Rule { […] }
43. ManfredSteyer Rule calling Templates export default function (options: MenuOptions): Rule { return (host: Tree, context: SchematicContext) => { […] } }
44. ManfredSteyer Rule calling Templates export default function (options: MenuOptions): Rule { return (host: Tree, context: SchematicContext) => { const templateSource = apply(url('./files'), [ filterTemplates(options), template({...stringUtils, ...options}), move(options.sourceDir) ]); […] } } passed properties passed functions
45. ManfredSteyer Rule calling Templates export default function (options: MenuOptions): Rule { return (host: Tree, context: SchematicContext) => { const templateSource = apply(url('./files'), [ filterTemplates(options), template({...stringUtils, ...options}), move(options.sourceDir) ]); const rule = chain([ branchAndMerge(chain([ mergeWith(templateSource), […] ])) ]); return rule(host, context); } }
46. ManfredSteyer Scaffolding whole Angular Applications?
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48. ManfredSteyer
49. ManfredSteyer Needed Steps Example covering all cases Finding Variation Points Define Model to Describe Variation Points Write and Test Generator Take time for Reviews! Refactor to use Libraries and Components
50. ManfredSteyer DEMO
51. ManfredSteyer Current State Use it as is or Fork it or Contribute!
52. ManfredSteyer Further information • Great introduction in Angular Blog • https://blog.angular.io/schematics-an-introduction-dc1dfbc2a2b2 • My Tutorial/ Case Study (3 articles so far) • https://goo.gl/kGS6L5 • Angular-Crud (Generator) • https://www.npmjs.com/package/angular-crud
53. ManfredSteyer Conclusion Automate boring tasks! Official Solution in ng world CLI, Nx, Ngrx, … Staging Area, Templates, Rules Create own or tweak existing ones Try it out!
54. ManfredSteyer Contact and Downloads [mail] manfred.steyer@SOFTWAREarchitekt.at [blog] SOFTWAREarchitekt.at [twitter] ManfredSteyer