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Master Tooling by Hacking the Angular Compiler by Dominic Elm

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AST @elmd_

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Abstract Syntax Tree @elmd_

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@elmd_ NGULAR CLI

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@elmd_ NGULAR CLI Schematics

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@elmd_ ESLint NGULAR CLI Schematics

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@elmd_ ESLint NGULAR CLI Schematics

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@elmd_ ESLint NGULAR CLI Schematics

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@elmd_ AST ESLint NGULAR CLI Schematics

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@elmd_ Dominic Elm thoughtram https://thoughtram.io StackBlitz https://stackblitz.com Google Developer Expert https://bit.ly/2nAqRrZ

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Angular Checklist @elmd_

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@elmd_ @KwintenP Kwinten Pisman Thanks!

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ngx-template-streams? @elmd_

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Angular library that tries to embrace reactivity and supercharges templates with Observables. @elmd_ “

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Click Me @Component({...}) export class AppComponent implements OnInit { clicks$ = new Subject(); ngOnInit() { // we can either manually subscribe // or use the async pipe this.clicks$.subscribe(console.log); } }

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Click Me @Component({...}) export class AppComponent implements OnInit { clicks$ = new Subject(); ngOnInit() { // we can either manually subscribe // or use the async pipe this.clicks$.subscribe(console.log); } }

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Click Me @Component({...}) export class AppComponent implements OnInit { clicks$ = new Subject(); ngOnInit() { // we can either manually subscribe // or use the async pipe this.clicks$.subscribe(console.log); } }

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Click Me @Component({...}) export class AppComponent implements OnInit { clicks$ = new Subject(); ngOnInit() { // we can either manually subscribe // or use the async pipe this.clicks$.subscribe(console.log); } }

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Click Me @Component({...}) export class AppComponent implements OnInit { @ObservableEvent() clicks$: Observable; ngOnInit() { // we can either manually subscribe // or use the async pipe this.clicks$.subscribe(console.log); } }

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Click Me @Component({...}) export class AppComponent implements OnInit { @ObservableEvent() clicks$: Observable; ngOnInit() { // we can either manually subscribe // or use the async pipe this.clicks$.subscribe(console.log); } }

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The Angular Build System @elmd_

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@elmd_ Angular CLI

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Webpack @elmd_

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Webpack @elmd_ Ahead of Time Compiler for the Browser

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Webpack @elmd_ Ahead of Time Compiler for the Browser Common Misconception: It’s not only for JavaScript ⚠

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Webpack *.bundle.js *.bundle.js main.bundle.js App @elmd_ Ahead of Time Compiler for the Browser Common Misconception: It’s not only for JavaScript ⚠

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Webpack @elmd_ webpack.config.js

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Webpack Loader Loader Loader ngc Plugin Plugin AngularCompilerPlugin AngularCompilerPlugin @elmd_ webpack.config.js

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Webpack Loader Loader Loader ngc Plugin Plugin AngularCompilerPlugin Angular Code AngularCompilerPlugin @elmd_ webpack.config.js

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Webpack Loader Loader Loader ngc Plugin Plugin AngularCompilerPlugin Angular Code AngularCompilerPlugin @elmd_ webpack.config.js

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Webpack Loader Loader Loader ngc Plugin Plugin AngularCompilerPlugin Angular Code Resolve Dependencies, Bundle AngularCompilerPlugin @elmd_ webpack.config.js

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Webpack Loader Loader Loader ngc Plugin Plugin AngularCompilerPlugin Angular Code Resolve Dependencies, Bundle Bundle AngularCompilerPlugin @elmd_ webpack.config.js

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webpack.config.js Webpack Loader Loader Loader ngc Plugin Plugin AngularCompilerPlugin Generated Angular Code Resolve Dependencies, Bundle AngularCompilerPlugin @elmd_ WebpackCompilerHost ts.CompilerHost

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webpack.config.js Webpack Loader Loader Loader ngc Plugin Plugin AngularCompilerPlugin Generated Angular Code Resolve Dependencies, Bundle AngularCompilerPlugin ngProgram AOT ts.Program JIT @elmd_ WebpackCompilerHost ts.CompilerHost

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webpack.config.js Webpack Loader Loader Loader ngc Plugin Plugin AngularCompilerPlugin Generated Angular Code Resolve Dependencies, Bundle AngularCompilerPlugin Analysis AOT ngProgram AOT ts.Program JIT @elmd_ WebpackCompilerHost ts.CompilerHost

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webpack.config.js Webpack Loader Loader Loader ngc Plugin Plugin AngularCompilerPlugin Generated Angular Code Resolve Dependencies, Bundle AngularCompilerPlugin Resolve AOT Analysis AOT ngProgram AOT ts.Program JIT @elmd_ WebpackCompilerHost ts.CompilerHost

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webpack.config.js Webpack Loader Loader Loader ngc Plugin Plugin AngularCompilerPlugin Generated Angular Code Resolve Dependencies, Bundle AngularCompilerPlugin Resolve AOT Analysis AOT ngProgram AOT ts.Program JIT @elmd_ WebpackCompilerHost ts.CompilerHost Type Checking AOT

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webpack.config.js Webpack Loader Loader Loader ngc Plugin Plugin AngularCompilerPlugin Generated Angular Code Resolve Dependencies, Bundle AngularCompilerPlugin Resolve AOT Analysis AOT ngProgram AOT ts.Program JIT Transformer @elmd_ WebpackCompilerHost ts.CompilerHost Type Checking AOT Emit

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webpack.config.js Webpack Loader Loader Loader ngc Plugin Plugin AngularCompilerPlugin Generated Angular Code Resolve Dependencies, Bundle AngularCompilerPlugin Angular Code Resolve AOT Analysis AOT ngProgram AOT ts.Program JIT Transformer @elmd_ WebpackCompilerHost ts.CompilerHost Type Checking AOT Emit

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Cool. But what’s next? @elmd_

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Loader .html @elmd_

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Angular rocks! " Loader .html Angular rocks! " @elmd_

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webpack.config.js Webpack Loader Loader Loader ngc Plugin Plugin AngularCompilerPlugin Angular Code Resolve Dependencies, Bundle Bundle AngularCompilerPlugin @elmd_

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webpack.config.js Webpack Loader Loader Loader ngc Plugin Plugin AngularCompilerPlugin Angular Code Resolve Dependencies, Bundle Bundle AngularCompilerPlugin HTML Loader Custom Loader @elmd_

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Builders @elmd_

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ngx-build-plus @elmd_ Thanks Manfred Steyer

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$ @elmd_

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$ ng add ngx-build-plus $ @elmd_

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$ ng add ngx-build-plus touch extra-webpack-config.js $ $ @elmd_

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module.exports = { module: { rules: [ { test: /\.html$/, use: [ { loader: path.resolve('path/to/custom/html/loader') }, { loader: 'raw-loader' "// import file as a string } ] } ] } }; @elmd_

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$ ng add ngx-build-plus touch extra-webpack-config.js $ $ @elmd_

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$ ng add ngx-build-plus touch extra-webpack-config.js $ touch our-plugin.js $ $ @elmd_

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export default { pre() { "// before build }, post() { "// after build }, config(config: webpack.Configuration) { "// after webpack config was built by the CLI } }; @elmd_

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export default { pre() { "// before build }, post() { "// after build }, config(config: webpack.Configuration) { const acp = findAngularCompilerPlugin(config) as AngularCompilerPlugin; if (!acp) { throw new Error('AngularCompilerPlugin not found'); } const options: AngularCompilerPluginOptions = { ""...acp.options, directTemplateLoading: false "// ""<-- IMPORTANT }; config.plugins = removeCompilerPlugin(config.plugins, acp); const newCompilerPlugin = new AngularCompilerPlugin(options); @elmd_

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export default { pre() { "// before build }, post() { "// after build }, config(config: webpack.Configuration) { const acp = findAngularCompilerPlugin(config) as AngularCompilerPlugin; if (!acp) { throw new Error('AngularCompilerPlugin not found'); } const options: AngularCompilerPluginOptions = { ""...acp.options, directTemplateLoading: false "// ""<-- IMPORTANT }; config.plugins = removeCompilerPlugin(config.plugins, acp); const newCompilerPlugin = new AngularCompilerPlugin(options); @elmd_

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if (!acp) { throw new Error('AngularCompilerPlugin not found'); } const options: AngularCompilerPluginOptions = { ""...acp.options, directTemplateLoading: false "// ""<-- IMPORTANT }; config.plugins = removeCompilerPlugin(config.plugins, acp); const newCompilerPlugin = new AngularCompilerPlugin(options); config.plugins.push(newCompilerPlugin); return config; } }; @elmd_

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if (!acp) { throw new Error('AngularCompilerPlugin not found'); } const options: AngularCompilerPluginOptions = { ""...acp.options, directTemplateLoading: false "// ""<-- IMPORTANT }; config.plugins = removeCompilerPlugin(config.plugins, acp); const newCompilerPlugin = new AngularCompilerPlugin(options); config.plugins.push(newCompilerPlugin); return config; } }; @elmd_

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if (!acp) { throw new Error('AngularCompilerPlugin not found'); } const options: AngularCompilerPluginOptions = { ""...acp.options, directTemplateLoading: false "// ""<-- IMPORTANT }; config.plugins = removeCompilerPlugin(config.plugins, acp); const newCompilerPlugin = new AngularCompilerPlugin(options); config.plugins.push(newCompilerPlugin); return config; } }; @elmd_

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if (!acp) { throw new Error('AngularCompilerPlugin not found'); } const options: AngularCompilerPluginOptions = { ""...acp.options, directTemplateLoading: false "// ""<-- IMPORTANT }; config.plugins = removeCompilerPlugin(config.plugins, acp); const newCompilerPlugin = new AngularCompilerPlugin(options); config.plugins.push(newCompilerPlugin); return config; } }; @elmd_

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if (!acp) { throw new Error('AngularCompilerPlugin not found'); } const options: AngularCompilerPluginOptions = { ""...acp.options, directTemplateLoading: false "// ""<-- IMPORTANT }; config.plugins = removeCompilerPlugin(config.plugins, acp); const newCompilerPlugin = new AngularCompilerPlugin(options); config.plugins.push(newCompilerPlugin); return config; } }; @elmd_

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Inline templates? @elmd_

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webpack.config.js Webpack Loader Loader Loader ngc Plugin Plugin AngularCompilerPlugin Generated Angular Code Resolve Dependencies, Bundle AngularCompilerPlugin Angular Code Resolve AOT Analysis AOT ngProgram AOT ts.Program JIT Transformer @elmd_ WebpackCompilerHost ts.CompilerHost Type Checking AOT Emit

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webpack.config.js Webpack Loader Loader Loader ngc Plugin Plugin AngularCompilerPlugin Generated Angular Code Resolve Dependencies, Bundle AngularCompilerPlugin Angular Code Resolve AOT Analysis AOT ngProgram AOT ts.Program JIT Transformer @elmd_ WebpackCompilerHost ts.CompilerHost Type Checking AOT Emit Transformer Custom TS Transformer

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TypeScript Transformers @elmd_

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export function transformer(context: ts.TransformationContext) { return (sourceFile: ts.SourceFile) "=> { "// change sourceFile (AST) }; } @elmd_

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let a = 1; @elmd_ VariableStatement VariableDeclaration VariableDeclarationList NumericalLiteral text = “1” text = “a” Identifier SourceFile

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let a = 1; SourceFile VariableStatement VariableDeclaration VariableDeclarationList text = “a” Identifier @elmd_ NumericalLiteral text = “1”

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let a = 1; SourceFile VariableStatement VariableDeclaration VariableDeclarationList NumericalLiteral text = “1” @elmd_ text = “a” Identifier

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let a = 1; SourceFile VariableStatement VariableDeclarationList NumericalLiteral text = “1” @elmd_ text = “a” Identifier VariableDeclaration

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let a = 1; SourceFile VariableStatement VariableDeclarationList NumericalLiteral text = “1” @elmd_ text = “a” Identifier VariableDeclaration

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let a = 1; SourceFile VariableStatement VariableDeclarationList NumericalLiteral text = “1” @elmd_ text = “a” Identifier VariableDeclaration

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SourceFile VariableStatement VariableDeclarationList NumericalLiteral text = “1” @elmd_ text = “a” Identifier VariableDeclaration let a = 1;

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@elmd_

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export function transformer(context: ts.TransformationContext) { return (sourceFile: ts.SourceFile) "=> { /** * Todos: * 1. Find `template` property within @Component decorator * 2. Apply HTML transformation * 3. Update AST node * 4. Return updated SourceFile "*/ }; } @elmd_

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export function transformer(context: ts.TransformationContext) { return (sourceFile: ts.SourceFile) "=> { const template = findInlineTemplate(sourceFile); return updateInlineTemplate(template, sourceFile, context); }; } @elmd_

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export function transformer(context: ts.TransformationContext) { return (sourceFile: ts.SourceFile) "=> { const template = findInlineTemplate(sourceFile); return updateInlineTemplate(template, sourceFile, context); }; } function findInlineTemplate(sourceFile: ts.SourceFile) { return sourceFile.statements[1].decorators[0].expression .arguments[0].properties[0].initializer.text; } @elmd_

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export function transformer(context: ts.TransformationContext) { return (sourceFile: ts.SourceFile) "=> { const template = findInlineTemplate(sourceFile); return updateInlineTemplate(template, sourceFile, context); }; } function findInlineTemplate(sourceFile: ts.SourceFile) { return sourceFile.statements[1].decorators[0].expression .arguments[0].properties[0].initializer.text; } @elmd_

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TSQuery @elmd_ Thanks Craig Spence CSS-like Selectors for the TS AST

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@elmd_ export function transformer(context: ts.TransformationContext) { return (sourceFile: ts.SourceFile) "=> { const template = findInlineTemplate(sourceFile); return updateInlineTemplate(template, sourceFile, context); }; } function findInlineTemplate(sourceFile: ts.SourceFile) { return tsquery.query(sourceFile, INLINE_TEMPLATE_QUERY); }

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@elmd_ export function transformer(context: ts.TransformationContext) { return (sourceFile: ts.SourceFile) "=> { const template = findInlineTemplate(sourceFile); return updateInlineTemplate(template, sourceFile, context); }; }

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@elmd_ export function transformer(context: ts.TransformationContext) { return (sourceFile: ts.SourceFile) "=> { const template = findInlineTemplate(sourceFile); return updateInlineTemplate(template, sourceFile, context); }; } function updateInlineTemplate( nodes: Array, sourceFile: ts.SourceFile, context: ts.TransformationContext) { const visitor: ts.Visitor = (node: ts.Node) "=> { "// ast walker function return ts.visitEachChild(node, visitor, context); }; return ts.visitNode(sourceFile, visitor); }

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@elmd_ export function transformer(context: ts.TransformationContext) { return (sourceFile: ts.SourceFile) "=> { const template = findInlineTemplate(sourceFile); return updateInlineTemplate(template, sourceFile, context); }; } function updateInlineTemplate( nodes: Array, sourceFile: ts.SourceFile, context: ts.TransformationContext) { const visitor: ts.Visitor = (node: ts.Node) "=> { "// ast walker function return ts.visitEachChild(node, visitor, context); }; return ts.visitNode(sourceFile, visitor); }

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@elmd_ export function transformer(context: ts.TransformationContext) { return (sourceFile: ts.SourceFile) "=> { const template = findInlineTemplate(sourceFile); return updateInlineTemplate(template, sourceFile, context); }; } function updateInlineTemplate( nodes: Array, sourceFile: ts.SourceFile, context: ts.TransformationContext) { const visitor: ts.Visitor = (node: ts.Node) "=> { "// ast walker function return ts.visitEachChild(node, visitor, context); }; return ts.visitNode(sourceFile, visitor); }

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@elmd_ export function transformer(context: ts.TransformationContext) { return (sourceFile: ts.SourceFile) "=> { const template = findInlineTemplate(sourceFile); return updateInlineTemplate(template, sourceFile, context); }; } function updateInlineTemplate( nodes: Array, sourceFile: ts.SourceFile, context: ts.TransformationContext) { const visitor: ts.Visitor = (node: ts.Node) "=> { "// ast walker function return ts.visitEachChild(node, visitor, context); }; return ts.visitNode(sourceFile, visitor); }

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@elmd_ function updateInlineTemplate( nodes: Array, sourceFile: ts.SourceFile, context: ts.TransformationContext) { const visitor: ts.Visitor = (node: ts.Node) "=> { "// ast walker function return ts.visitEachChild(node, visitor, context); }; return ts.visitNode(sourceFile, visitor); }

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function updateInlineTemplate( nodes: Array, sourceFile: ts.SourceFile, context: ts.TransformationContext) { const visitor: ts.Visitor = (node: ts.Node) "=> { if (nodes.includes(node)) { const prop = node as ts.PropertyAssignment; const currentTpl = prop.initializer.getFullText(); const inlineTpl = ts.createNoSubstitutionTemplateLiteral( updateDirectives(currentTpl, true) ); return ts.updatePropertyAssignment(prop, prop.name, inlineTpl); } return ts.visitEachChild(node, visitor, context); }; return ts.visitNode(sourceFile, visitor); @elmd_

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if (!acp) { throw new Error('AngularCompilerPlugin not found'); } const options: AngularCompilerPluginOptions = { ""...acp.options, directTemplateLoading: false "// ""<-- IMPORTANT }; config.plugins = removeCompilerPlugin(config.plugins, acp); const newCompilerPlugin = new AngularCompilerPlugin(options); config.plugins.push(newCompilerPlugin); return config; } }; @elmd_

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if (!acp) { throw new Error('AngularCompilerPlugin not found'); } const options: AngularCompilerPluginOptions = { ""...acp.options, directTemplateLoading: false "// ""<-- IMPORTANT }; config.plugins = removeCompilerPlugin(config.plugins, acp); const newCompilerPlugin = new AngularCompilerPlugin(options); acp._transformers = [inlineTplTransformer, ""...acp._transformers]; config.plugins.push(newCompilerPlugin); return config; } }; @elmd_

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https://github.com/typebytes/ngx-template-streams @elmd_

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Key Takeaways @elmd_

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Key Takeaways @elmd_ The Angular Compiler doesn’t need to be scary

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Key Takeaways @elmd_ TypeScript Transformers can be used to transform our own source code The Angular Compiler doesn’t need to be scary

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Key Takeaways @elmd_ TypeScript Transformers can be used to transform our own source code ASTs are powerful and the foundation of many tools The Angular Compiler doesn’t need to be scary

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Key Takeaways @elmd_ TypeScript Transformers can be used to transform our own source code ASTs are powerful and the foundation of many tools Tooling and code automation can be so much fun and save lots of time The Angular Compiler doesn’t need to be scary

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Thank You NG-BE! @elmd_