node-typescript-compiler
v4.0.0
Published
Exposes typescript compiler (tsc) as a node.js module
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Readme
Exposes the TypesScript compiler (tsc) as a node.js module
Allows you to invoke tsc
from a node script.
This work trivially by spawning tsc
from whenever it can be found, ideally a sibling ../node_modules/typescript
module.
Example use case: I'm using this to build several variants of my modules = node / browser, calling tsc
with slight modifications of target
and lib
.
Note to evaluators: This module is solidly built (not a hack), it works in a straightforward and reliable way and will properly catch and report any possible error. Usage in production is thus possible.
installation
node-typescript-compiler requires the typescript module as a sibling, not included so you can choose your version. (node-typescript-compiler will intelligently try to locate another typescript install if it can't be found as a sibling. This is not recommended)
npm i --save-dev typescript
npm i --save-dev node-typescript-compiler
Node requirements: >=12 since this module is now pure ESM. If needed, the older v3 should work for older node >=4. Not promising anything.
Usage
WARNING You should have a working TypeScript setup with a tsc
+tsconfig.json
before using this tool.
It'll be easier to know where the errors are from: your setup or this tool?
The module exposes a unique function, compile({tscOptions}, [files], [{options}])
:
tscOptions
is a hashmap of tsc options- Note: you're better re-using a
tsconfig.json
and using just{ project: '.' }
to refer to it
- Note: you're better re-using a
files
is an optional array of files to compile, if not implied throughtscOptions
(force it toundefined
if you need the 3rd param)options
is an optional hash of:verbose: boolean
(defaultfalse
) explain what's happening and display more detailed errorsbanner: string
(defaultnode-typescript-compiler:
) what is displayed as the first line of stdout
Example invocation: Compile current project:
import tsc from 'node-typescript-compiler'
await tsc.compile({
'project': '.'
})
--> Will spawn tsc --project .
Example invocation: Compile current project with some options overridden
import tsc from 'node-typescript-compiler'
const tsconfig = { json: require('../tsconfig.json') }
await tsc.compile(
{
...tsconfig.json.compilerOptions,
declaration: false,
outDir: 'dist/es6.amd',
module: 'amd'
},
tsconfig.json.files,
)
--> Will spawn tsc <…non-overriden tsconfig options> --outDir dist/es6.amd --module amd
(boolean "false" values cause the corresponding option to not be added to the invocation string, this is the intended behaviour)
Example invocation: Get help
import tsc from 'node-typescript-compiler'
await tsc.compile({
help: true
})
--> Will spawn tsc --help
(boolean "true" values are not needed thus don't appear on the invocation string, option presence is enough)
Usage notes
This module should be fairly stable. Its behaviour is straightforward and all possible error cases should be caught.
This module will intelligently try to extract the error message from stdout/stderr if possible.
Output is forwarded, with a radix: tsc>
The output is monitored and on detection of an incremental recompilation, a convenient separator will be displayed.
Also the --listFiles
option should lead to a readable output.
This module should work on Windows thanks to using the cross-spawn package. However this has NOT been tested personally by the author.
Design considerations
It seems we could do that more elegantly and at a lower level by directly calling tsc code, as explained here: https://basarat.gitbooks.io/typescript/content/docs/compiler/overview.html
However, that would take a lot of time and effort, and I'm afraid of API changes. So no.
See also
https://www.npmjs.com/package/ntypescript but they have poor doc and don't allow choosing the typescript version (ex. using the unstable "next")