Unrecognized self-referencing @scope/package

[Conaclos]

Bug Report

🔎 Search Terms

• self-referencing
• self-referencing package
• node12
• module resolution

🕗 Version & Regression Information

TypeScript 4.5 Beta and TypeScript Nightly

🙁 Actual behavior

Given the next package.json:

{
    "name": "@scope/package",
    "type": "module",
    "main": "./compiled/src/index.cjs",
    "exports": {
        "import": "./compiled/src/index.js",
        "require": "./compiled/src/index.cjs"
    },
    ...
}

And the following tsconfig.json:

{
    "module": "node12",
    ...
}

The following code does not compile:

import * as src from "@scope/package"

The obtained error is Cannot find module '@scope/package' or its corresponding type declarations.

🙂 Expected behavior

TSC currently compile self-referencing package that has unscoped names. TSC should also compile self-referencing scoped packages such as @scope/package.

[IllusionMH]

do you have exports in package.json as required by Node.js?
https://nodejs.org/api/packages.html#packages_self_referencing_a_package_using_its_name

[Conaclos]

Andrii Dieiev (@IllusionMH) Yes. I updated the issue to highlight this. Thanks.

[andrewbranch]

Also just checking that your ... in tsconfig.json does not include moduleResolution (which is implied by module but can be overridden).

[Conaclos]

Andrew Branch (@andrewbranch)
Yes this field is not present.
To be exhaustive, I have the following tsconfigs:

// tsconfig-base.json
{
  "compilerOptions": {
    // https://node.green/#ES2019
    // https://kangax.github.io/compat-table/es2016plus
    "lib": ["ES2019"],
    "module": "node12",
    "target": "ES2019",

    "noEmit": true,

    "sourceMap": true,

    "importHelpers": true,
    "newLine": "lf",
    "stripInternal": true,
    "useDefineForClassFields": true,

    "esModuleInterop": true,
    "importsNotUsedAsValues": "error",
    "isolatedModules": true,
    "preserveValueImports": true,

    "allowUnreachableCode": false,
    "checkJs": true,
    "exactOptionalPropertyTypes": true,
    "forceConsistentCasingInFileNames": true,
    "noFallthroughCasesInSwitch": true,
    "noImplicitOverride": true,
    "noImplicitReturns": true,
    "noPropertyAccessFromIndexSignature": true,
    "strict": true
  }
}

// src/tsconfig.json
{
  "extends": "../tsconfig-base.json",
  "compilerOptions": {
    "outDir": "../compiled/src",
    "noEmit": false,
    "emitDeclarationOnly": true,

    "composite": true,
    "declarationMap": true,

    "types": ["node"]
  },
  "include": ["**/*.ts"]
}

// tests/tsconfig.json
{
  "extends": "../tsconfig-base.json",
  "compilerOptions": {
    //"paths": { "@scope/package": ["../src/index.js"] },
    "types": ["node"]
  },
  "include": ["**/*.ts"],
  "references": [{ "path": "../src" }]
}