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Support for running in worker threads #32

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Description

With the default options the following doesn't work.

const python = pythonBridge();

Instead we get the following error. If I set stdio to ['ignore', 'pipe', 'pipe'] it works without an issue. It'd be nice to either detect the worker thread and use different defaults or catch the error and show a nicer message.

TypeError [ERR_INVALID_OPT_VALUE]: The value "WritableWorkerStdio {
 _writableState: WritableState {
 objectMode: false,
 highWaterMark: 16384,
 finalCalled: false,
 needDrain: false,
 ending: false,
 ended: false,
 finished: false,
 destroyed: false,
 decodeStrings: false,
 defaultEncoding: 'utf8',
 length: 97,
 writing: true,
 corked: 0,
 sync: false,
 bufferProcessing: false,
 onwrite: [Function: bound onwrite],
 writecb: [Function],
 writelen: 97,
 bufferedRequest: null,
 lastBufferedRequest: null,
 pendingcb: 1,
 prefinished: false,
 errorEmitted: false,
 emitClose: true,
 autoDestroy: false,
 bufferedRequestCount: 0,
 corkedRequestsFree: {
 next: null,
 entry: null,
 finish: [Function: bound onCorkedFinish]
 }
 },
 writable: true,
 _events: [Object: null prototype] {},
 _eventsCount: 0,
 _maxListeners: undefined,
 [Symbol(kPort)]: MessagePort {
 active: true,
 refed: true,
 _events: [Object: null prototype] {
 newListener: [Function],
 removeListener: [Function],
 message: [Function]
 },
 _eventsCount: 3,
 [Symbol(kWaitingStreams)]: 1
 },
 [Symbol(kName)]: 'stdout',
 [Symbol(kWritableCallbacks)]: [ [Function: bound onwrite] ]
}" is invalid for option "stdio"
 at internal/child_process.js:996:13
 at Array.reduce (<anonymous>)
 at getValidStdio (internal/child_process.js:922:17)
 at ChildProcess.spawn (internal/child_process.js:340:11)
 at Object.spawn (child_process.js:535:9)
 at Function.pythonBridge (/Users/xo/code/scratch/node_modules/python-bridge/index.js:22:28)
 at PostProcessor.<anonymous> (/Users/xo/code/scratch/workers/post-processor.ts:91:24)
 at step (/Users/xo/code/scratch/workers/post-processor.ts:50:23)
 at Object.next (/Users/xo/code/scratch/workers/post-processor.ts:31:53)
 at /Users/xo/code/scratch/workers/post-processor.ts:25:71
 at new Promise (<anonymous>)
 at __awaiter (/Users/xo/code/scratch/workers/post-processor.ts:21:12)
 at PostProcessor.guessit (/Users/xo/code/scratch/workers/post-processor.ts:96:16)
 at /Users/xo/code/scratch/workers/post-processor.ts:78:29
 at Array.map (<anonymous>)
 at PostProcessor.<anonymous> (/Users/xo/code/scratch/workers/post-processor.ts:77:36)

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