typeRoots is not working?

[vvakame]

I want to try to use @types like repository.

TypeScript Version: Version 2.2.0-dev.20161114

Code

$ tree
tree
.
├── package.json
├── src
│   └── index.ts
├── tsconfig.json
└── typings
    └── foo
        └── index.d.ts

$ cat tsconfig.json
{
    "compilerOptions": {
        "module": "commonjs",
        "target": "es5",
        "typeRoots": [
            "./typings"
        ],
        "types": [
            "foo"
        ],
        "noImplicitAny": false,
        "sourceMap": false
    },
    "include": [
        "src/**/*.ts"
    ]
}

$ cat typings/foo/index.d.ts
export function hi(): void;

$ cat src/index.ts
import * as _ from "foo";

$ tsc -p ./tsconfig.json --traceResolution
======== Resolving module 'foo' from '/***/work/src/index.ts'. ========
Module resolution kind is not specified, using 'NodeJs'.
Loading module 'foo' from 'node_modules' folder.
File '/***/word/src/node_modules/foo.ts' does not exist.

...omit...

File '/node_modules/foo/index.jsx' does not exist.
======== Module name 'foo' was not resolved. ========
======== Resolving type reference directive 'foo', containing file '/***/work/__inferred type names__.ts', root directory '/***/work/typings'. ========
Resolving with primary search path '/***/work/typings'
File '/***/work/typings/foo/package.json' does not exist.
File '/***/work/typings/foo/index.d.ts' exist - use it as a name resolution result.
Resolving real path for '/***/work/typings/foo/index.d.ts', result '/***/work/typings/foo/index.d.ts'
======== Type reference directive 'foo' was successfully resolved to '/***/work/typings/foo/index.d.ts', primary: true. ========
src/index.ts(1,20): error TS2307: Cannot find module 'foo'.

tsc can find typings/foo/index.d.ts , but compile was failed...

Expected behavior:

compile successful.

I expect "typeRoots": [] and "typeRoots: ["./node_modules/@types/"]" are equivalent.
I hope I want to use "typeRoots: ["./node_modules/@types/", "./typings/"]"

Actual behavior:

compile failure.

I read wiki, handbook.
related? #11329 #11137

[mhegazy]

this is a duplicate of #11137

typeRoots are only used to resolve /// <reference types=".." /> directives. if you want to import it, then just use baseUrl or add a path mapping entry. you do not need typeRoots in this case.

[vvakame]

thank you for your advice!
I am glad that the documentation is more detailed.