Typescript: TS2300: Duplicate identifier

[monolithed]

TypeScript Version: 2.2.1

{
    "compilerOptions": {
        "typeRoots": [
            "./node_modules/@types",
            "./types"
        ],

        "outDir": "cache/",

        "types": [
            "debug",
            "deepmerge",
            "imap",
            "faker",
            "minimist",
            "mocha",
            "nodemailer",
            "node",
            "request",
            "webdriverio"
        ],

        "lib": [
            "es2017",
            "scripthost",
            "webworker",
            "dom"
        ],

        "target": "es2017",
        "module": "commonjs",
        "moduleResolution": "node",
        "noImplicitAny": false,

        "declaration": false,
        "allowJs": true,

        "emitDecoratorMetadata": true,
        "experimentalDecorators": true,
        "sourceMap": true
    },

    "exclude": [
        "./config.js",
        "./config.local.js",
        "./node_modules",
        "./utils",
        "./tasks",
        "./files",
        "./cache"
    ]
}

➜ tsc
/usr/local/lib/node_modules/typescript/lib/lib.dom.d.ts(14171,14): error TS2300: Duplicate identifier 'EventListenerOrEventListenerObject'.
/usr/local/lib/node_modules/typescript/lib/lib.dom.d.ts(14897,6): error TS2300: Duplicate identifier 'AlgorithmIdentifier'.
/usr/local/lib/node_modules/typescript/lib/lib.dom.d.ts(14898,6): error TS2300: Duplicate identifier 'BodyInit'.
/usr/local/lib/node_modules/typescript/lib/lib.dom.d.ts(14920,6): error TS2300: Duplicate identifier 'IDBKeyPath'.
/usr/local/lib/node_modules/typescript/lib/lib.dom.d.ts(14929,6): error TS2300: Duplicate identifier 'RequestInfo'.
/usr/local/lib/node_modules/typescript/lib/lib.dom.d.ts(14930,6): error TS2300: Duplicate identifier 'USVString'.
/usr/local/lib/node_modules/typescript/lib/lib.dom.d.ts(14934,6): error TS2300: Duplicate identifier 'IDBValidKey'.
/usr/local/lib/node_modules/typescript/lib/lib.dom.d.ts(14935,6): error TS2300: Duplicate identifier 'BufferSource'.
/usr/local/lib/node_modules/typescript/lib/lib.webworker.d.ts(72,5): error TS2403: Subsequent variable declarations must have the same type.  Variable 'source' must be of type 'Window', but here has type 'any'.
/usr/local/lib/node_modules/typescript/lib/lib.webworker.d.ts(367,5): error TS2375: Duplicate number index signature.
/usr/local/lib/node_modules/typescript/lib/lib.webworker.d.ts(398,14): error TS2403: Subsequent variable declarations must have the same type.  Variable 'srcElement' must be of type 'Element', but here has type 'any'.
/usr/local/lib/node_modules/typescript/lib/lib.webworker.d.ts(446,5): error TS2375: Duplicate number index signature.
/usr/local/lib/node_modules/typescript/lib/lib.webworker.d.ts(715,14): error TS2403: Subsequent variable declarations must have the same type.  Variable 'source' must be of type 'Window', but here has type 'any'.
/usr/local/lib/node_modules/typescript/lib/lib.webworker.d.ts(1096,14): error TS2403: Subsequent variable declarations must have the same type.  Variable 'responseXML' must be of type 'Document', but here has type 'any'.
/usr/local/lib/node_modules/typescript/lib/lib.webworker.d.ts(1684,14): error TS2300: Duplicate identifier 'EventListenerOrEventListenerObject'.
/usr/local/lib/node_modules/typescript/lib/lib.webworker.d.ts(1710,13): error TS2403: Subsequent variable declarations must have the same type.  Variable 'onmessage' must be of type '(this: Window, ev: MessageEvent) => any', but here has type '(this: DedicatedWorkerGlobalScope, ev: MessageEvent) => any'.
/usr/local/lib/node_modules/typescript/lib/lib.webworker.d.ts(1715,13): error TS2403: Subsequent variable declarations must have the same type.  Variable 'location' must be of type 'Location', but here has type 'WorkerLocation'.
/usr/local/lib/node_modules/typescript/lib/lib.webworker.d.ts(1716,13): error TS2403: Subsequent variable declarations must have the same type.  Variable 'onerror' must be of type 'ErrorEventHandler', but here has type '(this: DedicatedWorkerGlobalScope, ev: ErrorEvent) => any'.
/usr/local/lib/node_modules/typescript/lib/lib.webworker.d.ts(1718,13): error TS2403: Subsequent variable declarations must have the same type.  Variable 'self' must be of type 'Window', but here has type 'WorkerGlobalScope'.
/usr/local/lib/node_modules/typescript/lib/lib.webworker.d.ts(1724,13): error TS2403: Subsequent variable declarations must have the same type.  Variable 'navigator' must be of type 'Navigator', but here has type 'WorkerNavigator'.
/usr/local/lib/node_modules/typescript/lib/lib.webworker.d.ts(1743,6): error TS2300: Duplicate identifier 'AlgorithmIdentifier'.
/usr/local/lib/node_modules/typescript/lib/lib.webworker.d.ts(1744,6): error TS2300: Duplicate identifier 'BodyInit'.
/usr/local/lib/node_modules/typescript/lib/lib.webworker.d.ts(1745,6): error TS2300: Duplicate identifier 'IDBKeyPath'.
/usr/local/lib/node_modules/typescript/lib/lib.webworker.d.ts(1746,6): error TS2300: Duplicate identifier 'RequestInfo'.
/usr/local/lib/node_modules/typescript/lib/lib.webworker.d.ts(1747,6): error TS2300: Duplicate identifier 'USVString'.
/usr/local/lib/node_modules/typescript/lib/lib.webworker.d.ts(1748,6): error TS2300: Duplicate identifier 'IDBValidKey'.
/usr/local/lib/node_modules/typescript/lib/lib.webworker.d.ts(1749,6): error TS2300: Duplicate identifier 'BufferSource'.

I see these errors with lib.webworker

[RyanCavanaugh]

You can't target webworker and dom at the same time -- these are mutually exclusive, and have different types for certain global variables. You'll need two separate compilations, one for the code which runs in your webworker threads, and one for code which runs in the DOM

[monolithed]

@RyanCavanaugh, I got it, thanks! Could you show such errors not like a stack trace?

[RyanCavanaugh]

Not sure what you mean?

[monolithed]

/usr/local/lib/node_modules/typescript/lib/lib.dom.d.ts(14171,14): error TS2300: Duplicate identifier 'EventListenerOrEventListenerObject'.

Usually such error messages are not informative. It would be nice to print something like:

You can't target webworker and dom at the same time -- these are mutually exclusive, and have different types for certain global variables. You'll need two separate compilations, one for the code which runs in your webworker threads, and one for code which runs in the DOM

😉