TypeScript 7 Professional

The TypeScript 7 Professional exam assesses your working knowledge of TypeScript at the level required to maintain and migrate real-world codebases — now rebuilt as a native Go binary that is roughly 10x faster than previous versions.

Topics covered include:

• Generics: constraints, defaults, variance (in/out), indexed access
• Conditional types, infer, mapped types, template literal types
• Utility types: Partial/Required/Pick/Omit/Exclude/Extract/NonNullable/ReturnType/Parameters/InstanceType
• Discriminated unions, exhaustive narrowing, type guards, satisfies/as const
• Migration 5.x→6→7: removed flags and values (es5, amd/umd/systemjs, node10/classic, baseUrl, outFile, downlevelIteration, assert→with) and flags made unconditional (esModuleInterop, stableTypeOrdering)
• New default semantics: strict, module esnext, types: [], rootDir, noUncheckedSideEffectImports, libReplacement
• Parallel builds: --checkers, --builders, --singleThreaded, stableTypeOrdering, watch mode
• Side-by-side operation: @typescript/typescript6, tsc6, API gap in 7.0
• TypeScript 7.1: import attributes in ambient modules, source phase imports, es2026/esnext lib additions

Passing this exam demonstrates professional competency in modern TypeScript and practical readiness for the TypeScript 7 toolchain transition.