sourcemap support, and global ts-node CLI.

Enable experimental hooks that re-map imports and require calls to support: In the future, this hook will also support: Default: false, but will likely be enabled by default in a future version Scope compiler to files within scopeDir. Note the uppercase -P. This is different from tsc's -p/--project option. Note: If you are using the --project command line argument as per the Configuration Options, and want to apply this same behavior when launching in VS Code, add an "env" key into the launch configuration: "env": { "TS_NODE_PROJECT": "" }. The TypeScript compiler has a set of additional flags to inform the compiler of transformations that are expected to happen to the sources to generate the final output. The following example tells ts-node to execute a webpack config as CommonJS: Each key is a glob pattern with the same syntax as tsconfig's "include" array. To skip typechecking in ts-node, do one of the following: If you absolutely must typecheck in ts-node: ts-node works by registering hooks for .ts, .tsx, .js, and/or .jsx extensions. You must also ensure node is passed --loader. To write your own transpiler plugin, check our API docs. within a directory. Environment: TS_NODE_SCOPE. Wherever possible, it is recommended to use TypeScript's NodeNext or Node16 mode instead of the options described

Disable top-level await in REPL. These are bugs in your code or configuration. Environment: TS_NODE_EMIT.

Skip project config resolution and loading, Default: false In those cases we will use an older default configuration. TypeScript license information. US to Canada by car with an enhanced driver's license, no passport? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Environment: TS_NODE_IGNORE, Default: false Environment: TS_NODE_FILES, Ignore TypeScript warnings by diagnostic code, Override the path patterns to skip compilation, Default: /node_modules/ add the ability to configure custom transformers. ts-node is licensed under the MIT license. name of a module which can be require()d. The built-in swc plugin is exposed as ts-node/transpilers/swc. (compatibility). Solution: configure your project to compile and execute as native ESM. In rare cases, you may need to override this behavior for some files. Below is an example of a triple-slash directive as a relative path within your project: If none of the above work, and you must use files, include, or exclude, enable our files option. You have moved your project to ESM but still have a config file, such as, Solution: if supported by the relevant tool, rename your config file to. Watching files and code reloads are out of scope for the project. This can happen for a few reasons: This error is thrown by node when a module has an unrecognized file extension, or no extension at all, and is being executed as native ESM. You have a mix of CommonJS and native ESM in your project, Solution: double-check all package.json "type" and tsconfig.json "module" configuration, Solution: consider simplifying by making your project entirely CommonJS or entirely native ESM, You are using a tool which has an extensionless binary, such as. SyntaxError), and cannot be fixed by TypeScript or ts-node.

Available from 4.7+, the node16 and nodenext modes integrate with Nodes native ECMAScript Module support. In other words, they intend us to write our imports in a way node already understands. Environment: TS_NODE_TRANSPILE_ONLY, Default: true Useful if you want ts-node and tsc to use. TypeScript Compile Options: module vs target. TypeScript execution and REPL for node.js.

// Remove if you want ts-node to do typechecking. .js and .jsx are only transformed when allowJs is enabled. SWC support is built-in via the --swc flag or "swc": true tsconfig option. ES2015 modules) can result in a project that works until you decide to support a feature natively from node.js. Connect and share knowledge within a single location that is structured and easy to search. Environment: TS_NODE_COMPILER_HOST. This configuration is necessary if your package.json has "type": "module". Was there a Russian safe haven city for politicians and scientists? TypeScript execution and REPL for node.js, with source map and native ESM support.

in this section. // compilerOptions specified here will override those declared below, // but *only* in ts-node. When multiple patterns match the same file, the last pattern takes precedence. Then add the following to your tsconfig.json. See Missing types for details. Proof that When all the sides of two triangles are congruent, the angles of those triangles must also be congruent (Side-Side-Side Congruence). Tip: Installing modules locally allows you to control and share the versions through package.json. My question is because modules [import / export ] are part of es6 and NOT es5 , the transpiled javascript code should not be having import / export statements.

Default: obeys package.json "type" and tsconfig.json "module" It is important to note that the compiler will not perform any of these transformations; it just uses these pieces of information to guide the process of resolving a module import to its definition file. Alternatively, you can invoke node directly and install ts-node via --require/-r. All command-line flags support both --camelCase and --hyphen-case. But the javascript code that is generated is having import / export statements even though the target is es5 , how is it possible ? Most options can be declared in your tsconfig.json: Configuration via tsconfig.json. TranspilerModule interface. Environment: TS_NODE_LOG_ERROR, Default: false

TypeScript is almost always written using modern import syntax, but it is also transformed before being executed by the underlying runtime. Note: --watch-extensions is only used in --watch mode. When executing TypeScript with npx or yarn dlx, the code resides within a temporary node_modules directory.

Anything outside this directory is ignored. optional chaining operator. This error is thrown by node when a module is require()d, but node believes it should execute as native ESM. For complete usage, limitations, and to provide feedback, see #1007. Is there a PRNG that visits every number exactly once, in a non-trivial bitspace, without repetition, without large memory usage, before it cycles? avoid certain typechecking failures. Use this configuration if your package.json does not have "type": "module".

See how TypeScript improves day to day working with JavaScript with minimal additional syntax. Vanilla node loads .js by reading code from disk and executing it. ts-node index.ts) and TypeScript resolves dependencies based on imports and references. Setting "module": "NodeNext" and using the .cts file extension should work well for most projects. If you have package.json configured with "type": "module" and tsconfig.json with To fix this, you must switch to "target": "es2019" or lower so TypeScript transforms ?. Making statements based on opinion; back them up with references or personal experience. Our scope and scopeDir options will limit transformation to files 465), Design patterns for asynchronous API communication. You will still benefit from ts-node's automatic tsconfig.json discovery, This means TypeScript files are transformed according to your tsconfig.json "module" Plugins are require()d by ts-node, so they can be a local script or a node module published to npm. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. into something node can understand. Transpilers such as swc can transform TypeScript into JavaScript You can choose to either transform to CommonJS or to preserve the native import syntax, using node's native ESM support. See the Modules reference page for more information. In these cases, ts-node can skip typechecking, making it much faster. Explore how TypeScript extends JavaScript to add more safety and tooling. This requires that your type definitions be structured as type packages (not loose TypeScript definition files). The official TypeScript Handbook explains the intended purpose for "paths" in "Additional module resolution flags". The difference between "require(x)" and "import x", Understanding esModuleInterop in tsconfig file, Angular: 7.2.1 ES6 class ReferenceError : Cannot access 'X' before initialization, Cardboard box giving me strange mesh errors, Sum of Convergent Series for Problem Like Schrdingers Cat, Short story about the creation of a spell that creates a copy of a specific woman. We also register a few other hooks to apply sourcemaps to stack traces and remap from .js imports to .ts.

Find centralized, trusted content and collaborate around the technologies you use most. Otherwise your code will compile fine, but node will throw a SyntaxError. When ts-node is used with allowJs, all non-ignored JavaScript files are transformed by ts-node. It is more common to use CommonJS or AMD modules with ES5 JavaScript.

You have installed an ESM dependency but your own code compiles to CommonJS. Older versions of typescript are incompatible with @tsconfig/node16. The latest documentation can also be found on our website: https://typestrong.org/ts-node. Like node's --experimental-specifier-resolution, but can also be set in your tsconfig.json for convenience.

We recommend using the NODE_OPTIONS environment variable to pass options to node. Requires --compilerHost, Default: false

This means "paths" are intended to describe mappings that the build tool or runtime already performs, not to tell the build tool or For example, a webpack.config.ts cannot be given its own package.json to override "type". Load files, include and exclude from tsconfig.json on startup. If you are not using our CLI, pass the loader flag to node. With the latest node and typescript, this is @tsconfig/node16. Set "module": "NodeNext" and everything should work. You can run tsc --noEmit to do this. Apparently this combination was not even allowed before TypeScript 2.0. Override the module type of certain files, ignoring the package.json "type" field. Note that ts-node-dev is incompatible with our native ESM loader. Note: --esm must spawn a child process to pass it --loader. What is module option in tsconfig used for? Create a new Node.js debug configuration, add -r ts-node/register to node args and move the program to the args list (so VS Code doesn't look for outFiles). By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. .tsx and .jsx are only transformed when jsx is enabled. node and tsc behavior. // Most ts-node options can be specified here using their programmatic names. Use --skipProject to skip loading the tsconfig.json. CommonJS supports extensionless files but native ESM does not.