error TS2304: Cannot find name 'SomeCustomType' while trying to use custom declarations for js modules with no types.

Hello,

I have a node typescript project, below is my tsconfig.json at the root of my project:

<tsconfig.json>

{
    "compilerOptions": {
        "incremental": true,
        "target": "es2017",
        "outDir": "dist",
        "rootDir": "src",
        "moduleResolution": "node",
        "module": "commonjs",
        "declaration": true,
        "declarationDir": "./types",
        "declarationMap": true,
        "inlineSourceMap": true,
        "esModuleInterop": true /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */,
        "resolveJsonModule": true /* Include modules imported with .json extension. */,
        /* Additional Checks */
        "noUnusedLocals": true /* Report errors on unused locals. */,
        "noUnusedParameters": true /* Report errors on unused parameters. */,
        "noImplicitReturns": true /* Report error when not all code paths in function return a value. */,
        "noFallthroughCasesInSwitch": true /* Report errors for fallthrough cases in switch statement. */,
        /* Debugging Options */
        "traceResolution": false /* Report module resolution log messages. */,
        "listEmittedFiles": false /* Print names of generated files part of the compilation. */,
        "listFiles": false /* Print names of files part of the compilation. */,
        "pretty": true /* Stylize errors and messages using color and context. */,
        "lib": ["es2015", "DOM"],
        "types": ["node"],
        "typeRoots": ["node_modules/@types", "src/types"]
    },
    "include": ["src/**/*.ts", "types/self_delarations.d.ts"],
    "exclude": ["node_modules/**"],
    "compileOnSave": true
}

I have exported all declaration files and their maps in types folder which is at the root of my project

As you can see I’ve added a file (types/self_delarations.d.ts) in include array in the above config. this file has types that I add for imported js libraries with no types of their own. here is the contents of self_declarations.d.ts:

<self_delarations.d.ts>

declare module 'my-awesome-js-library' {
    type SomeCustomType = string | boolean;
    const someFunction: () => SomeCustomType;

    export { someFunction, SomeCustomType };
    export default someFunction;
}

The library has one index.js file with the following content:

<node_modules/my-awesome-js-library/index.js>

function someFunction() { return false };

try {
	module.exports = someFunction;
} catch (e) {
	String.someFunction = someFunction;
}

I am consuming this library just fine in my project.

However, I am using dts-bundle-generator as a post build process by running:

dts-bundle-generator -o ./dist/bundle.d.ts ./types/index.d.ts

this tries to generate bundle.d.ts in my dist folder, and generates the following content :

export declare const data2: SomeCustomType;

and this is causing an error: dist/bundle.d.ts(1,29): error TS2304: Cannot find name 'SomeCustomType'.

How can I resolve this issue? I want to be able to add custom types in my types/self_declarations.d.ts file for modules that don’t have their own types.

[Rush]

I have a similar issue. I understand a minimal repro is needed. If I don’t find a solution I’ll try to create one but it may be difficult for more complex projects. I understand it may be difficult to guess what’s wrong without a repro. Anyhow, FYI!

[timocov]

I’m going to close the issue. If you’ll have any question or updates - feel free to ping me.