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@esbuild-kit/esm-loader
Advanced tools
Readme
Node.js loader for loading TypeScript files.
node:
import prefixestsconfig.json
paths
Protip: use with cjs-loader or tsx
esm-loader only transforms ES modules (
.mjs
/.mts
extensions or.js
files inmodule
type packages).To transform CommonJS files (
.cjs
/.cts
extensions or.js
files incommonjs
type packages), use this with cjs-loader.Alternatively, use tsx to handle them both automatically.
npm install --save-dev @esbuild-kit/esm-loader
Pass @esbuild-kit/esm-loader
into the --loader
flag.
node --loader @esbuild-kit/esm-loader ./file.ts
The following properties are used from tsconfig.json
in the working directory:
strict
: Whether to transform to strict modejsx
: Whether to transform JSX
Warning: When set to
preserve
, the JSX syntax will remain untransformed. To prevent Node.js from throwing a syntax error, chain another Node.js loader that can transform JSX to JS.
jsxFactory
: How to transform JSXjsxFragmentFactory
: How to transform JSX FragmentsjsxImportSource
: Where to import JSX functions fromallowJs
: Whether to apply the tsconfig to JS filespaths
: For resolving aliasestsconfig.json
pathBy default, tsconfig.json
will be detected from the current working directory.
To set a custom path, use the ESBK_TSCONFIG_PATH
environment variable:
ESBK_TSCONFIG_PATH=./path/to/tsconfig.custom.json node --loader @esbuild-kit/esm-loader ./file.ts
Modules transformations are cached in the system cache directory (TMPDIR
). Transforms are cached by content hash so duplicate dependencies are not re-transformed.
Set environment variable ESBK_DISABLE_CACHE
to a truthy value to disable the cache:
ESBK_DISABLE_CACHE=1 node --loader @esbuild-kit/esm-loader ./file.ts
Yes. This loader transpiles JSON modules so it's also compatible with named imports.
Node.js has built-in support for network imports behind the --experimental-network-imports
flag.
You can pass it in with esm-loader
:
node --loader @esbuild-kit/esm-loader --experimental-network-imports ./file.ts
In ESM, import paths must be explicit (must include file name and extension).
For backwards compatibility, this loader adds support for classic Node resolution for extensions: .js
, .json
, .ts
, .tsx
, .jsx
. Resolving a index
file by the directory name works too.
import file from './file' // -> ./file.js
import directory from './directory' // -> ./directory/index.js
ESM import resolution expects explicit import paths, whereas CommonJS resolution expects implicit imports (eg. extensionless & directory imports).
As a result of this change, Node.js changes how it imports a path that matches both a file and directory. In ESM, the directory would be imported, but in CJS, the file would be imported.
To use to the CommonJS resolution algorithm, use the --experimental-specifier-resolution=node
flag.
node --loader @esbuild-kit/esm-loader --experimental-specifier-resolution=node ./file.ts
tsx - Node.js runtime powered by esbuild using @esbuild-kit/cjs-loader
and @esbuild-kit/esm-loader
.
@esbuild-kit/cjs-loader - TypeScript & ESM to CJS transpiler using the Node.js loader API.
FAQs
Node.js loader for compiling TypeScript modules to ESM
The npm package @esbuild-kit/esm-loader receives a total of 344,078 weekly downloads. As such, @esbuild-kit/esm-loader popularity was classified as popular.
We found that @esbuild-kit/esm-loader demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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