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TypeScript for Enterprise Applications - Part 2

TypeScript for Enterprise Applications - Part 2

Advanced Configuration for TypeScript for applications at the scale of Enterprise.

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Mukesh
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tsconfig.json is a configuration file for TypeScript projects. It is located in the root folder of a TypeScript project and contains compiler options to compile the TypeScript code..

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The tsc cli-tool, if invoked without parameters, starts searching for tsconfig.json in the current directory and moves up the parent directories until it finds the file. Alternatively, you can specify the file's location using the --project parameter.

With the option "strict": true, it ensures strong correctness of a program by enabling these checks:noImplicitAny restricts to define explicit any for a variable.

  • noImplicitThis raises error when there is a this is any implicit any.

  • alwaysStrict JS "use strict" mode.

  • strictBindCallApply restricts bind, call and apply calling underlying function with correct type.

  • strictNullChecks restricts using null explicit.

  • strictFunctionTypes function parameters to be checked for their types.

  • strictPropertyInitialization give value to properties.

  • noUnusedLocals stops you using unused local variables.

  • noUnusedparameters restricts you using unused parameter with prefix "_"

  • noImplicitReturns restricts return type

  • noFallthroughCasesInSwitch returns error if non-empty case doesn't do break or return.

  • types specify @types/* packages to be included.

  • stripInternal information meant only for internal purposes.

  • exactOptionalPropertyTypes It stops using undefined as an optional property.

  • noUncheckedIndexedAccess undeclared keys should be assigned to undefined so they won't go unchecked.

  • noPropertyAccessFromIndexSignature property should be accessed using the "[]" syntax and not the "." syntax.

  • noImplicitOverride should specify 'override' explicitly.

  • allowSyntheticDefaultImports allow commonJS module as ESM module.

  • esModuleInterop manages interoperability of ESM and CJS.

  • skipDefaultLibCheck stops breaking changes from node_modules.

  • useUnknownInCatchVariables errors caught will be promoted to unknown instead of any.

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