webpack ts-loader error using TS 4.7

[mjbvz]

Bug Report

🔎 Search Terms

• webpack
• ts-loader
• @types

🕗 Version & Regression Information

• This changed between versions TS 4.6-1-rc and 4.7.0-dev.20220223

💻 Code

Clone https://github.com/mjbvz/ts-47-webpack-error

In the project run:

npm i
npm run build

🙁 Actual behavior

The presence of @types/dompurify in the project triggers the following error:

ERROR in ./src/index.ts
Module build failed (from ./node_modules/ts-loader/index.js):
TypeError: path.indexOf is not a function
    at normalizeSlashes (/Users/matb/projects/san/ts-webpack/node_modules/typescript/lib/typescript.js:7691:26)
    at Object.combinePaths (/Users/matb/projects/san/ts-webpack/node_modules/typescript/lib/typescript.js:7757:28)
    at /Users/matb/projects/san/ts-webpack/node_modules/typescript/lib/typescript.js:41922:40
    at Object.firstDefined (/Users/matb/projects/san/ts-webpack/node_modules/typescript/lib/typescript.js:407:26)
    at primaryLookup (/Users/matb/projects/san/ts-webpack/node_modules/typescript/lib/typescript.js:41921:27)
    at Object.resolveTypeReferenceDirective (/Users/matb/projects/san/ts-webpack/node_modules/typescript/lib/typescript.js:41880:24)
    at /Users/matb/projects/san/ts-webpack/node_modules/ts-loader/dist/servicesHost.js:713:18
    at /Users/matb/projects/san/ts-webpack/node_modules/ts-loader/dist/servicesHost.js:128:141
    at Array.map (<anonymous>)
    at Object.resolveTypeReferenceDirectives (/Users/matb/projects/san/ts-webpack/node_modules/ts-loader/dist/servicesHost.js:128:124)

🙂 Expected behavior

This example builds under TS 4.6-rc and TS 4.5. I'm guessing something about the TS internal APIs that ts-loader depends on has changed

[mjbvz]

This seems to be caused by this directive at the top of @types/dompurify:

/// <reference types="trusted-types"/>

I can actually simplify this repo: it seems you just need any triple slash type reference in the project to cause the crash. I also see this when adding /// <reference types="node"/> to src/index.js

[fatcerberus]

Callstack looks the same as #47921, but that one was tagged External.

[RyanCavanaugh]

See e.g. TypeStrong/ts-node#1647

[RyanCavanaugh]

Logged TypeStrong/ts-loader#1421

[johnnyreilly]

I've put together a speculative fix for this issue in ts-loader. @mjbvz would you care to give it a test? It appears to work, but my testing is purely based on your repro repo; I haven't encountered this issue directly myself.

TypeStrong/ts-loader#1422

[typescript-bot]

This issue has been marked as 'External' and has seen no recent activity. It has been automatically closed for house-keeping purposes.