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TypeScript 3.7 — LanguageService.getEmitOutput returns an empty result #33936
Description
TypeScript version: 3.7.0-dev.20191010
We're trying to build VS Code using TS 3.7. As part of this, we use TypeScript LanguageService.getEmitOutput method to request the emitted d.ts of various files: https://github.com/microsoft/vscode/blob/363b9769412fea0d9aef07fa1801371c14d72741/build/monaco/api.ts#L619
WIth TS 3.6, getEmitOutputends up returning a result. However with TS 3.7, it returns an empty array starting on one file: vs/editor/common/standalone/standaloneBase
Activity
mjbvz commentedon Oct 10, 2019
A few other observations:
getEmitOutputdoes work correctly for a few files before failing onstandaloneBaseemitOnlyDtsFilestofalse, I do see the js file being output forstandaloneBasebut not ad.tsfilesheetalkamat commentedon Oct 10, 2019
Your tsconfig doesn't have "declaration" enabled and hence its not generating it. 11fd654 changed the way emitOnlyDts works because I had mixed forcing d.ts emit to be always generated with API
emitOnlyDtsand that could be why you see it. CurrentlyforceDtsis internal but do you mind making that method as any and passing that as true to see if that resolves the issue?mjbvz commentedon Oct 10, 2019
Thanks. If I monkey patch the TS source to set
forceDtsto true, It does seem to work. I can't figure out how to enableforceDtsfrom our code howeverAdd forceDtsEmit flag to getEmitOutput