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I'm using TypeScript (1.6) with node under the --harmony flag, so I'd like to transpile the es6 module syntax to commonjs.
From what I can tell, I can't do this with TypeScript 1.6. If I set my target to es6, and module to commonjs, I get a TypeScript error -
Cannot compile modules into 'commonjs', 'amd', 'system' or 'umd' when targeting 'ES6' or higher.
Why won't TypeScript compile to commonjs with an ES6 target? I imagine a lot people want to do this since node doesn't support ES6 modules yet.
I'd thought the new moduleResolution compiler option might solve this issue, but it doesn't appear to do anything.
Currently, I'm having to use babel just to transpile the module syntax to commonjs, but I'd like to remove babel from my builds so I can take advantage of source maps.
Is there a way I can achieve this? NOTE: I do not want to transpile to ES5. I want my JS running as ES6 under the harmony flag. Thanks!
977
An ES6 Module can load other ES6 modules using import. An ES6 Module can load CommonJS using import. A CommonJS module can load other CommonJS modules using require. A CommonJS module previously COULD NOT load an ES6 Module, but today it can load an ES6 module using the import() function.
The syntax for importing modules in ES6 looks like this. The reason for this error is that Node js doesn't support ES6 import directly. If you try to use import for importing modules directly in node js it will throw out that error.
It is not deprecated.
While CommonJS and ES6 modules share similar syntax, they work in fundamentally different ways: ES6 modules are pre-parsed in order to resolve further imports before code is executed. CommonJS modules load dependencies on demand while executing the code.
The TypeScript team will add support for what you are looking for in the next release. You can wait for a few weeks/months. Alternatively, you can use a Polyfill for the ES6 module loader:
There are more libraries like the ones above available online just check which one does the job for you until official support for --module with --target es6 arrives.
tsconfig.json
{
"compilerOptions": {
"target":"ES6",
"moduleResolution": "classic",
}
}
import stuff transpiling due to
"moduleResolution": "classic"
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