TypeScript Roadmap - simpleprog

simpleprog

Foundations

▸ Generic Constraints & extends

▸ Generic Inference & Contextual Typing

▸ Generic Classes & Factories

Core Concepts

▸ Higher-Order Generic Functions

▸ Generic Type Guards & Assertions

▸ Distributive Conditional Types

Intermediate Skills

▸ Mapping with key remapping (TS 4.1+)

▸ Conditional Type Basics

▸ Infer Keyword

Advanced Topics

▸ Recursive Conditional Types

▸ Template Literal Types & Pattern Inference

▸ Mapped Types with as Clauses

Expert Level

▸ Satisfies Operator (TS 4.9+)

▸ Recursive Type Instantiation Limits

▸ Contextual Typing Patterns

Mastery

▸ Best Common Type

▸ Literal Inference (const assertions)

▸ Control Flow Narrowing

Ecosystem

▸ Discriminated Unions

▸ Assert Functions (TS 3.7+)

▸ Type Predicate Functions

Architecture

▸ Mapped Type Basics (in keyof)

▸ Mapping Modifiers (readonly, ?)

▸ Template Literal Types

Optimization

▸ Key Remapping via as

▸ Intrinsic String Types (Uppercase, Lowercase)

▸ Recursive Conditional & Mapped Types

Deployment

▸ Deep Mapped Type Patterns

▸ Class Decorators

▸ Method & Property Decorators

Phase 11

▸ Parameter & Accessor Decorators

▸ Decorator Factory & Metadata

▸ Decorator Order & Composition

Phase 12

▸ Reflect Metadata (reflect-metadata)

▸ emcascript Decorators (Stage 3)

▸ TypeScript Compiler Architecture

Phase 13

▸ SourceFile & AST Nodes

▸ TypeChecker API

▸ Custom Transforms (before/after)

Phase 14

▸ LanguageService & Plugins

▸ Program & Builder

▸ Performance Optimization for Type Checking

Phase 15

▸ Partial, Required, Readonly

▸ Pick, Omit, Extract, Exclude

▸ Record & NonNullable

Phase 16

▸ Parameters, ReturnType, ConstructorParameters

▸ ThisParameterType & OmitThisParameter

▸ Awaited (TS 4.5+)

Phase 17

▸ Custom Utility Type Implementation

▸ Extends Constraint vs Satisfies

▸ Branded/Nominal Types

Phase 18

▸ Type Guards via Branding

▸ Phantom Generics

▸ Exact Type Emulation

Phase 19

▸ Readonly Deep Constraint

▸ Type-Level Arithmetic & Recursion

▸ Structural vs Nominal Typing

Phase 20

▸ Brand Type Pattern

▸ Opaque Types with _brand

▸ Intersection Brand Types

Phase 21

▸ Flavoring (type-level branding)

▸ Brands with Symbols

▸ Real-World: Fluent Validation IDs

Phase 22

▸ Type Instantiation Complexity

▸ Excess Property Checking

▸ Emit vs No-Emit Performance

Phase 23

▸ Project References

▸ Incremental Builds (--incremental)

▸ Isolated Declarations (TS 5.5+)

Phase 24

▸ Type Tracing & Debugging

▸ Type Assertion Testing

▸ Expect-Type Utility

Phase 25

▸ ts-expect-error Directive

▸ Vitest for Type Tests

▸ Compiler API Test Patterns

Phase 26

▸ Type Regression Testing

▸ Testing Distributive Types

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