Project references have caused TypeScript path aliases to no longer function as expected

In the past, I encountered an issue with package.json not being placed under rootDir. Fortunately, I stumbled upon a helpful question on StackOverflow that addressed this exact problem. By following the recommendations provided in this answer, I managed to resolve that issue. However, my path aliases were still not recognized by tsc when attempting to generate declaration files using tsc --build src

Note: Initially, I did not include declaration-specific properties like "declaration": true or

"emitDeclarationOnly": true
in my tsconfig.json because I was unable to transpile the code in the first place. My main focus at the moment is to get the path aliases working as they present a more complex and distinct issue compared to generating .d.ts files. If this becomes problematic, I will address it later in a comment under the same issue.

Directory Structure:

.
├── src/
│   ├── helpers/
│   │   └── parseOptions.ts
│   ├── eswatch.ts
│   └── tsconfig.json
├── package.json
└── tsconfig.json

./tsconfig.json

{
  "compilerOptions": {
    "rootDir": ".",
    "outDir": ".",
    "resolveJsonModule": true,
    "composite": true,
  },
  "files": ["package.json"],
}

./src/tsconfig.json

{
  "compilerOptions": {
    "rootDir": ".",
    "outDir": "../types",
    "resolveJsonModule": true
  },
  "paths": {
    "@eswatch/*": ["./*"]
  },
  "references": [
    { "path": "../" }
  ]
}

The issue persists where path aliases are not functioning correctly when used with project references. Ideally, these aliases should work seamlessly, leading to the generation of declaration files.

Answer №1

Great news! After some investigation, I discovered a rather silly mistake that had gone unnoticed. It turns out that the paths property in the tsconfig.json file should actually be located within the compilerOptions section instead of being at the root level. Here is the corrected configuration that worked for me:

{
  "compilerOptions": {
    "rootDir": ".",
    "outDir": "../types",
    "resolveJsonModule": true,
    "paths": {
       "@eswatch/*": ["./*"]
     }
  },
  "references": [
    { "path": "../" }
  ]
}

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