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20 lines
439 B
CoffeeScript
20 lines
439 B
CoffeeScript
fs = require 'fs'
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BABEL_PREFIXES = [
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"'use babel'"
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'"use babel"'
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'/** @babel */'
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'/* @flow */'
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]
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PREFIX_LENGTH = Math.max(BABEL_PREFIXES.map((prefix) -> prefix.length)...)
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buffer = Buffer(PREFIX_LENGTH)
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module.exports = (filename) ->
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file = fs.openSync(filename, 'r')
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fs.readSync(file, buffer, 0, PREFIX_LENGTH)
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fs.closeSync(file)
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BABEL_PREFIXES.some (prefix) ->
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prefix is buffer.toString('utf8', 0, prefix.length)
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