Is there a way to compile a String containing TypeScript to its JavaScript String equivalent ?
For instance, in Coffeescript (and LiveScript, coco etc) its a (simplified) one-liner:
jsCompiledCode = require('coffee-script').compile('do -> console.log "Hello world"', {bare:true});
Can something similar be implemented for TypeScript, preferably without involving the filesystem ? Are there any implications with referencing other modules that would have to be resolved at compile time ?
You can use the transpileModule() method that comes with TypeScript.
$ npm install typescript
// compile.ts
import * as ts from "typescript";
function tsCompile(source: string, options: ts.TranspileOptions = null): string {
// Default options -- you could also perform a merge, or use the project tsconfig.json
if (null === options) {
options = { compilerOptions: { module: ts.ModuleKind.CommonJS }};
}
return ts.transpileModule(source, options).outputText;
}
// Make sure it works
const source = "let foo: string = 'bar'";
let result = tsCompile(source);
console.log(result); // var foo = 'bar';
When compiling this you will need the tsconfig moduleResolution set to "Node".
This will compile / execute the above example file.
$ tsc compile.ts --moduleResolution Node && node compile.js
There is also some documentation.
import x from './relative/path' and such, is there a way to specify how its imports work?
require() calls. Note: the imported module would neither be bundled nor compiled by default.You can use TypeScript.Api nodejs package : https://npmjs.org/package/typescript.api
In particular check out this function : https://github.com/sinclairzx81/typescript.api#compile
