CODEWITHSUNDEEP
typescripttypescript-compiler-api
cspotcode
cspotcode

Reputation: 1892

Instantiate TypeScript LanguageService w/plugins via API

How can I use the TypeScript compiler API to instantiate a languageService with language service plugins? I thought that createLanguageService would do the trick, but it doesn't seem to load plugins.

Is this wrapped up in tsserver somewhere? Ideally I want to run everything in-process. Is there some sort of ServerHost I need to instantiate to give the languageService access to require() node_modules?

My motivation: I want to programmatically apply plugin quick-fixes to a codebase from a CLI tool I'm building.

Upvotes: 2

Views: 514

Answers (1)

cspotcode
cspotcode

Reputation: 1892

I think I figured it out. import * as ts from 'typescript/lib/tsserverlibrary'; (same import used when authoring plugins) and create a new ts.server.ProjectService. Then open a source file via projectService.openClientFile which will cause the service to automatically pick up your tsconfig and create a new ConfiguredProject which you can retrieve via various methods. Then configuredProject.getLanguageService().

You have to set serverHost.require or else the service can't load plugins and they'll be skipped. I copied TS's internal implementation from src/server/server.ts

I'm leaving out a lot of messy details, but these are the steps. Intellisense tells you everything else you need to do.

Upvotes: 4

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