TypeScript Version: 3.3.0-dev.20181213

Search Terms: Project References Composite Project Ambient Definitions

Code (minimum example, see repository link below for complete setup) tsconfig_base.json

{
  "compilerOptions": {
    "target": "es5",
    "module": "none",
    "declaration": true,
    "declarationMap": true,
    "sourceMap": true,
    "strict": true,
    "composite": true
  }
}

utils/tsconfig.json

{
  "extends": "../tsconfig_base.json",
  "include": [
    "*.ts",
    "*.d.ts"
  ]
}

utils/utils.d.ts

declare function leftPad(s: string, n: number): string;

converter/tsconfig.json

{
  "extends": "../tsconfig_base.json",
  "include": [
    "*.ts",
    "*.d.ts"
  ],
  "references": [
    { "path": "../utils" }
  ]
}

converter/length.ts

function formatInches(i: number) {
    if (i < 12) {
        return `${i}"`;
    }
    const ft = Math.floor(i / 12);
    i = i - ft * 12;
    return `${ft}' ${leftPad(i.toString(), 2)}`;
}

Expected behavior: Running tsc -b converter compiles successfully.

Actual behavior:

tsc -b converter --verbose
[13:10:29] Projects in this build:
    * utils/tsconfig.json
    * converter/tsconfig.json

[13:10:29] Project 'utils/tsconfig.json' is up to date because newest input 'utils/moreUtils.ts' is older than oldest output 'utils/moreUtils.js.map'

[13:10:29] Project 'converter/tsconfig.json' is out of date because output file 'converter/length.js' does not exist

[13:10:29] Building project '[...]/converter/tsconfig.json'...

converter/length.ts:18:22 - error TS2304: Cannot find name 'leftPad'.

18     return `${ft}' ${leftPad(i.toString(), 2)}`;
                        ~~~~~~~


Found 1 error.

(Local paths redacted)

As a side note, when compiling the packages into outFiles the compilation works just fine. (This can be seen in @RyanCavanaugh’s example repository from which mine is forked / when reverting to commit 0f66d20 of my example repository.)

Playground Link:

Example Repository: https://github.com/LucaVazz/ts-project-references-for-ambient

Related Issues: #22997 #25600 #26595 #26689 #26867