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Typescript

• Understand the Relationship Between TypeScript and JavaScript
• Know Which TypeScript Options You’re Using
• Understand That Code Generation Is Independent of Types
• Get Comfortable with Structural Typing
• Limit Use of the any Type
• Use Your Editor to Interrogate and Explore the Type System
• Think of Types as Sets of Values
• Know How to Tell Whether a Symbol Is in the Type Space or Value Space
• Prefer Type Annotations to Type Assertions
• Avoid Object Wrapper Types (String, Number, Boolean, Symbol, BigInt)
• Distinguish Excess Property Checking from Type Checking
• Apply Types to Entire Function Expressions When Possible
• Know the Differences Between type and interface
• Use readonly to Avoid Errors Associated with Mutation
• Use Type Operations and Generic Types to Avoid Repeating Yourself
• Prefer More Precise Alternatives to Index Signatures
• Avoid Numeric Index Signatures