Unexpected token when running tests with nyc

[rotu]

Upon running tests, nyc is crashing out due to a syntax error.

I believe this is because it's mistakenly trying to parse the TypeScript file as Flow. The file declaredScope.d.ts contains the below code:

declare function declaredScope(
    context: Rule.RuleContext,
    name: string
): Scope.Scope['type'] | undefined;

> cross-env BABEL_ENV=test nyc mocha tests/src

D:/Source/eslint-plugin-import/utils/declaredScope.d.ts: Unexpected token, expected ] (6:15)
node:events:498
      throw er; // Unhandled 'error' event
      ^

Error: spawn nyc ENOENT
    at notFoundError (D:\Source\eslint-plugin-import\node_modules\cross-spawn\lib\enoent.js:11:11)       
    at verifyENOENT (D:\Source\eslint-plugin-import\node_modules\cross-spawn\lib\enoent.js:46:16)        
    at cp.emit (D:\Source\eslint-plugin-import\node_modules\cross-spawn\lib\enoent.js:33:19)
    at ChildProcess._handle.onexit (node:internal/child_process:294:12)
    at Process.callbackTrampoline (node:internal/async_hooks:130:17)
Emitted 'error' event on ChildProcess instance at:
    at cp.emit (D:\Source\eslint-plugin-import\node_modules\cross-spawn\lib\enoent.js:36:37)
    at ChildProcess._handle.onexit (node:internal/child_process:294:12)
    at Process.callbackTrampoline (node:internal/async_hooks:130:17) {
  errno: 'ENOENT',
  code: 'ENOENT',
  syscall: 'spawn nyc'
}

debugger trace:

SyntaxError: Unexpected token, expected ] (6:15)
    at Parser.pp$5.raise (D:\Source\eslint-plugin-import\node_modules\babylon\lib\index.js:4454:13)
    at Parser.pp.unexpected (D:\Source\eslint-plugin-import\node_modules\babylon\lib\index.js:1761:8)
    at Parser.pp.expect (D:\Source\eslint-plugin-import\node_modules\babylon\lib\index.js:1749:33)
    at Parser.pp$8.flowParsePostfixType (D:\Source\eslint-plugin-import\node_modules\babylon\lib\index.js:5783:10)
    at Parser.pp$8.flowParsePrefixType (D:\Source\eslint-plugin-import\node_modules\babylon\lib\index.js:5795:17)
    at Parser.pp$8.flowParseAnonFunctionWithoutParens (D:\Source\eslint-plugin-import\node_modules\babylon\lib\index.js:5800:20)
    at Parser.pp$8.flowParseIntersectionType (D:\Source\eslint-plugin-import\node_modules\babylon\lib\index.js:5815:19)
    at Parser.pp$8.flowParseUnionType (D:\Source\eslint-plugin-import\node_modules\babylon\lib\index.js:5826:19)
    at Parser.pp$8.flowParseType (D:\Source\eslint-plugin-import\node_modules\babylon\lib\index.js:5837:19)
    at Parser.pp$8.flowParseTypeAndPredicateInitialiser (D:\Source\eslint-plugin-import\node_modules\babylon\lib\index.js:5023:17)
    at Parser.pp$8.flowParseDeclareFunction (D:\Source\eslint-plugin-import\node_modules\babylon\lib\index.js:5059:36)
    at Parser.pp$8.flowParseDeclare (D:\Source\eslint-plugin-import\node_modules\babylon\lib\index.js:5079:17)
    at Parser.parseExpressionStatement (D:\Source\eslint-plugin-import\node_modules\babylon\lib\index.js:5921:25)
    at Parser.pp$1.parseStatement (D:\Source\eslint-plugin-import\node_modules\babylon\lib\index.js:1911:17)
    at Parser.parseStatement (D:\Source\eslint-plugin-import\node_modules\babylon\lib\index.js:5910:22)
    at Parser.pp$1.parseBlockBody (D:\Source\eslint-plugin-import\node_modules\babylon\lib\index.js:2268:21)
    at Parser.pp$1.parseTopLevel (D:\Source\eslint-plugin-import\node_modules\babylon\lib\index.js:1778:8)
    at Parser.parse (D:\Source\eslint-plugin-import\node_modules\babylon\lib\index.js:1673:17)
    at parse (D:\Source\eslint-plugin-import\node_modules\babylon\lib\index.js:7305:37)
    at File.parse (D:\Source\eslint-plugin-import\node_modules\babel-core\lib\transformation\file\index.js:485:15)
    at File.parseCode (D:\Source\eslint-plugin-import\node_modules\babel-core\lib\transformation\file\index.js:570:20)
    at D:\Source\eslint-plugin-import\node_modules\babel-core\lib\transformation\pipeline.js:49:12
    at File.wrap (D:\Source\eslint-plugin-import\node_modules\babel-core\lib\transformation\file\index.js:532:16)
    at Pipeline.transform (D:\Source\eslint-plugin-import\node_modules\babel-core\lib\transformation\pipeline.js:47:17)
    at Object.transformFileSync (D:\Source\eslint-plugin-import\node_modules\babel-core\lib\api\node.js:152:10)
    at compile (D:\Source\eslint-plugin-import\node_modules\babel-register\lib\node.js:118:20)
    at loader (D:\Source\eslint-plugin-import\node_modules\babel-register\lib\node.js:144:14)
    at Object.require.extensions.<computed> [as .js] (D:\Source\eslint-plugin-import\node_modules\babel-register\lib\node.js:154:7)
    at NYC._readTranspiledSource (D:\Source\eslint-plugin-import\node_modules\nyc\index.js:166:28)
    at NYC.addFile (D:\Source\eslint-plugin-import\node_modules\nyc\index.js:156:25)
    at NYC.addAllFiles (D:\Source\eslint-plugin-import\node_modules\nyc\index.js:202:14)
    at main (D:\Source\eslint-plugin-import\node_modules\nyc\bin\nyc.js:72:5) {pos: 134, loc: Position, stack: 'SyntaxError: Unexpected token, expected ] (6:…-import\\node_modules\\nyc\\bin\\nyc.js:72:5)', message: 'Unexpected token, expected ] (6:15)'}

[ljharb]

hm, that makes sense. is there a way to tell nyc to strip types, or strip them ourselves?

[rotu]

I am very unfamiliar with nyc but I think adding "*/.d.ts" to the root .nycrc "exclude" list does the trick.

But I don't know why there are several .nycrc files scattered throughout the project. Can these be removed?

[ljharb]

This is a monorepo and each subpackage has its own config.