| 1 | /* eslint-disable no-param-reassign */
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| 2 | module.exports = message => {
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| 3 | let lines = message.split('\n')
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| 4 |
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| 5 | // Remove webpack-specific loader notation from filename.
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| 6 | // Before:
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| 7 | // ./~/css-loader!./~/postcss-loader!./src/App.css
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| 8 | // After:
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| 9 | // ./src/App.css
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| 10 | if (lines[0].lastIndexOf('!') !== -1) {
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| 11 | lines[0] = lines[0].substr(lines[0].lastIndexOf('!') + 1)
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| 12 | }
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| 13 |
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| 14 | // Webpack adds a list of entry points to warning messages:
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| 15 | // @ ./src/index.js
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| 16 | // @ multi react-scripts/~/react-dev-utils/webpackHotDevClient.js ...
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| 17 | // It is misleading (and unrelated to the warnings) so we clean it up.
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| 18 | // It is only useful for syntax errors but we have beautiful frames for them.
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| 19 | lines = lines.filter(line => line.indexOf(' @ ') !== 0)
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| 20 |
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| 21 | // line #0 is filename
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| 22 | // line #1 is the main error message
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| 23 | if (!lines[0] || !lines[1]) {
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| 24 | return lines.join('\n')
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| 25 | }
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| 26 |
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| 27 | // Cleans up verbose "module not found" messages for files and packages.
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| 28 | if (lines[1].indexOf('Module not found: ') === 0) {
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| 29 | lines = [
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| 30 | lines[0],
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| 31 | // Clean up message because "Module not found: " is descriptive enough.
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| 32 | lines[1]
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| 33 | .replace("Cannot resolve 'file' or 'directory' ", '')
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| 34 | .replace('Cannot resolve module ', '')
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| 35 | .replace('Error: ', '')
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| 36 | ]
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| 37 | }
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| 38 |
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| 39 | // Cleans up syntax error messages.
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| 40 | if (lines[1].indexOf('Module build failed: ') === 0) {
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| 41 | lines[1] = lines[1].replace('Module build failed: SyntaxError:', 'Syntax error:')
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| 42 | }
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| 43 |
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| 44 | // Clean up export errors.
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| 45 | // TODO: we should really send a PR to Webpack for this.
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| 46 | const exportError = /\s*(.+?)\s*(")?export '(.+?)' was not found in '(.+?)'/
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| 47 | if (lines[1].match(exportError)) {
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| 48 | lines[1] = lines[1].replace(
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| 49 | exportError,
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| 50 | "$1 '$4' does not contain an export named '$3'."
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| 51 | )
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| 52 | }
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| 53 |
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| 54 | // Reassemble the message.
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| 55 | message = lines.join('\n')
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| 56 | // Internal stacks are generally useless so we strip them... with the
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| 57 | // exception of stacks containing `webpack:` because they're normally
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| 58 | // from user code generated by WebPack. For more information see
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| 59 | // https://github.com/facebookincubator/create-react-app/pull/1050
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| 60 | message = message.replace(/^\s*at\s((?!webpack:).)*:\d+:\d+[\s)]*(\n|$)/gm, '') // at ... ...:x:y
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| 61 |
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| 62 | return message.trim()
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| 63 | }
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