How to Set Up TypeScript in a Node.js Project

Strict mode from day one - the tsconfig that catches bugs before they reach production.

Adding TypeScript to a Node.js project is easy. Configuring it so it actually catches bugs - and doesnt become a workaround exercise of any everywhere - requires intentional setup. This guide covers the tsconfig, path aliases, build tooling, and strict mode settings that make TypeScript worth using.

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Why Strict Mode Matters (And Why Teams Disable It)

Teams disable TypeScript strict mode for one reason: it requires more effort up front to fix type errors. This is precisely the point. Strict mode catches the null reference errors implicit any types and missing property checks that cause runtime bugs in production. The types of errors strict mode catches: strictNullChecks (accessing .length on string | undefined) noImplicitAny (function parameters without types) strictFunctionTypes (callback signature mismatches). Each of these is a real production bug class.

At Valletta Software, we focus on:

tsconfig.json: strict: true - non-negotiable set on day one not after

target: ES2022 module: NodeNext - modern output proper ESM/CJS handling

paths: configure @ aliases - no more ../../../utils/logger

rootDir and outDir: src/ to dist/ - clean separation of source and compiled output

include/exclude: explicit - never accidentally compile node_modules

sourceMap: true - readable stack traces in production that map to TypeScript source

skipLibCheck: true - skip third-party declaration files catches real errors faster

The Build Tooling That Makes TypeScript Fast

tsc is correct tsup and esbuild are fast. Know when to use each.

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Development: ts-node-dev or tsx - hot reload without a build step fast feedback loop

Production build: tsup (esbuild-based) - 10-100x faster than tsc single command bundle

Type checking: tsc --noEmit in CI - type errors fail the build esbuild skips type checking

ESLint plus @typescript-eslint: lint rules beyond type safety - consistent patterns across team

Prettier: automatic formatting - TypeScript formatting debates are not worth having

Declaration files: declaration: true if building a library - consumers get type hints

Incremental builds: incremental: true - tsc build caching for large projects

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How to Set Up TypeScript in a Node.js Project - With Engineers Who Start Strict

Our Node.js engineers configure TypeScript strict mode on project setup. Path aliases tsup for builds tsx for development and @typescript-eslint rules - from the first commit.

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Our Node.js engineers configure TypeScript strict mode, path aliases, tsup for production builds, tsx for development, and @typescript-eslint rules from the first commit.

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