rollup-plugin-ts Plugin crashes with Error: Debug Failure. False expression: Lexical environment is suspended.

Version: 1.3.6
Rollup Version: 2.32.1
Operating System and version (if applicable): Windows 10 2004
Node Version (if applicable): 12.18.3
Does it work with tsc (if applicable): yes

Reproduction

Clone the following repo, run yarn or npm install, and run yarn start or npm start: https://github.com/arseneyr/rollup-ts-broken

Expected Behavior

Rollup compiles successfully.

Actual Behavior

Fails with:

C:\Users\a\Repos\rollup-ts-broken>yarn start
yarn run v1.22.5
$ rollup -c

index.ts → stdout...
[!] (plugin Typescript) Error: Debug Failure. False expression: Lexical environment is suspended.Error: Debug Failure. False expression: Lexical environment is suspended.
    at Object.startLexicalEnvironment (C:\Users\a\Repos\rollup-ts-broken\node_modules\typescript\lib\typescript.js:96916:22)
    at visitLexicalEnvironment (C:\Users\a\Repos\rollup-ts-broken\node_modules\typescript\lib\typescript.js:78414:17)
    at Object.visitEachChild (C:\Users\a\Repos\rollup-ts-broken\node_modules\typescript\lib\typescript.js:78798:55)
    at Object.childContinuation (C:\Users\a\Repos\rollup-ts-broken\node_modules\@wessberg\rollup-plugin-ts\dist\cjs\index.js:4306:194)
    at visitSourceFile (C:\Users\a\Repos\rollup-ts-broken\node_modules\@wessberg\rollup-plugin-ts\dist\cjs\index.js:4028:20)
    at visitNode$4 (C:\Users\a\Repos\rollup-ts-broken\node_modules\@wessberg\rollup-plugin-ts\dist\cjs\index.js:4034:16)
    at Object.continuation (C:\Users\a\Repos\rollup-ts-broken\node_modules\@wessberg\rollup-plugin-ts\dist\cjs\index.js:4306:433)
    at C:\Users\a\Repos\rollup-ts-broken\node_modules\@wessberg\rollup-plugin-ts\dist\cjs\index.js:4352:37
    at applyTransformers (C:\Users\a\Repos\rollup-ts-broken\node_modules\@wessberg\rollup-plugin-ts\dist\cjs\index.js:2017:37)
    at Object.includeSourceFile (C:\Users\a\Repos\rollup-ts-broken\node_modules\@wessberg\rollup-plugin-ts\dist\cjs\index.js:4343:47)

error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

I'm not entirely sure what's causing this, but I've tried to create as minimal a repro as possible. Looks like some sort of interaction between templated static methods and imported mapped types? It seems to be a result of generating definition files, as it compiles successfully if "declaration": false is set in tsconfig.json.

Otherwise great plugin, thanks for your work!

Oct 22 '20 05:10 arseneyr

Getting the same issue 🙁

Version: 1.3.8 Rollup Version: 2.33.3 Operating System and version (if applicable): Mac OS Node Version (if applicable): 12.16.2 Does it work with tsc (if applicable): yes

Dec 04 '20 03:12 winexy

Got the same issue and think I made some progress. It seems to stem from (A) defining a function that (B) infers it's return type which (C) includes a generic. By either changing the function declaration into a function expression or explicitly adding a return type, I am able to get around the failure in your example repo.

The change is in index.ts:3 from export function f(arg: "a" | "b") { to export const f = function (arg: "a" | "b") {