function formatMessage(message, isError) {
  var lines = message.split('\n');

  if (lines.length > 2 && lines[1] === '') {
    // Remove extra newline.
    lines.splice(1, 1);
  }

  // Remove webpack-specific loader notation from filename.
  // Before:
  // ./~/css-loader!./~/postcss-loader!./src/App.css
  // After:
  // ./src/App.css
  if (lines[0].lastIndexOf('!') !== -1) {
    lines[0] = lines[0].substr(lines[0].lastIndexOf('!') + 1);
  }

  lines = lines.filter(function(line) {
    // Webpack adds a list of entry points to warning messages:
    //  @ ./src/index.js
    //  @ multi react-scripts/~/react-dev-utils/webpackHotDevClient.js ...
    // It is misleading (and unrelated to the warnings) so we clean it up.
    // It is only useful for syntax errors but we have beautiful frames for them.
    return line.indexOf(' @ ') !== 0;
  });

  // line #0 is filename
  // line #1 is the main error message
  if (!lines[0] || !lines[1]) {
    return lines.join('\n');
  }

  // Cleans up verbose "module not found" messages for files and packages.
  if (lines[1].indexOf('Module not found: ') === 0) {
    lines = [
      lines[0],
      // Clean up message because "Module not found: " is descriptive enough.
      lines[1]
        .replace("Cannot resolve 'file' or 'directory' ", '')
        .replace('Cannot resolve module ', '')
        .replace('Error: ', '')
        .replace('[CaseSensitivePathsPlugin] ', ''),
    ];
  }

  // Cleans up syntax error messages.
  if (lines[1].indexOf('Module build failed: ') === 0) {
    lines[1] = lines[1].replace(
      'Module build failed: SyntaxError:',
      friendlySyntaxErrorLabel
    );
  }

  // Clean up export errors.
  // TODO: we should really send a PR to Webpack for this.
  var exportError = /\s*(.+?)\s*(")?export '(.+?)' was not found in '(.+?)'/;
  if (lines[1].match(exportError)) {
    lines[1] = lines[1].replace(
      exportError,
      "$1 '$4' does not contain an export named '$3'."
    );
  }

  lines[0] = chalk.inverse(lines[0]);

  // Reassemble the message.
  message = lines.join('\n');
  // Internal stacks are generally useless so we strip them... with the
  // exception of stacks containing `webpack:` because they're normally
  // from user code generated by WebPack. For more information see
  // https://github.com/facebookincubator/create-react-app/pull/1050
  message = message.replace(
    /^\s*at\s((?!webpack:).)*:\d+:\d+[\s)]*(\n|$)/gm,
    ''
  ); // at ... ...:x:y

  return message.trim();
}
function formatMessage(message, isError) {
  var lines = message.split('\n');

  if (lines.length > 2 && lines[1] === '') {
    
    lines.splice(1, 1);
  }

  
  
  
  
  
  if (lines[0].lastIndexOf('!') !== -1) {
    lines[0] = lines[0].substr(lines[0].lastIndexOf('!') + 1);
  }

  lines = lines.filter(function(line) {
    
    
    
    
    
    return line.indexOf(' @ ') !== 0;
  });

  
  
  if (!lines[0] || !lines[1]) {
    return lines.join('\n');
  }

  
  if (lines[1].indexOf('Module not found: ') === 0) {
    lines = [
      lines[0],
      
      lines[1]
        .replace("Cannot resolve 'file' or 'directory' ", '')
        .replace('Cannot resolve module ', '')
        .replace('Error: ', '')
        .replace('[CaseSensitivePathsPlugin] ', ''),
    ];
  }

  
  if (lines[1].indexOf('Module build failed: ') === 0) {
    lines[1] = lines[1].replace(
      'Module build failed: SyntaxError:',
      friendlySyntaxErrorLabel
    );
  }

  
  
  var exportError = /\s*(.+?)\s*(")?export '(.+?)' was not found in '(.+?)'/;
  if (lines[1].match(exportError)) {
    lines[1] = lines[1].replace(
      exportError,
      "$1 '$4' does not contain an export named '$3'."
    );
  }

  lines[0] = chalk.inverse(lines[0]);

  
  message = lines.join('\n');
  
  
  
  
  message = message.replace(
    /^\s*at\s((?!webpack:).)*:\d+:\d+[\s)]*(\n|$)/gm,
    ''
  ); 

  return message.trim();
}
function formatMessage ( message , isError ) { var lines = message . split ( '\n' ) ; if ( lines . length > 2 && lines [ 1 ] === '' ) { // Remove extra newline. lines . splice ( 1 , 1 ) ; } // Remove webpack-specific loader notation from filename. // Before: // ./~/css-loader!./~/postcss-loader!./src/App.css // After: // ./src/App.css if ( lines [ 0 ] . lastIndexOf ( '!' ) !== - 1 ) { lines [ 0 ] = lines [ 0 ] . substr ( lines [ 0 ] . lastIndexOf ( '!' ) + 1 ) ; } lines = lines . filter ( function ( line ) { // Webpack adds a list of entry points to warning messages: //  @ ./src/index.js //  @ multi react-scripts/~/react-dev-utils/webpackHotDevClient.js ... // It is misleading (and unrelated to the warnings) so we clean it up. // It is only useful for syntax errors but we have beautiful frames for them. return line . indexOf ( ' @ ' ) !== 0 ; } ) ; // line #0 is filename // line #1 is the main error message if ( ! lines [ 0 ] || ! lines [ 1 ] ) { return lines . join ( '\n' ) ; } // Cleans up verbose "module not found" messages for files and packages. if ( lines [ 1 ] . indexOf ( 'Module not found: ' ) === 0 ) { lines = [ lines [ 0 ] , // Clean up message because "Module not found: " is descriptive enough. lines [ 1 ] . replace ( "Cannot resolve 'file' or 'directory' " , '' ) . replace ( 'Cannot resolve module ' , '' ) . replace ( 'Error: ' , '' ) . replace ( '[CaseSensitivePathsPlugin] ' , '' ) , ] ; } // Cleans up syntax error messages. if ( lines [ 1 ] . indexOf ( 'Module build failed: ' ) === 0 ) { lines [ 1 ] = lines [ 1 ] . replace ( 'Module build failed: SyntaxError:' , friendlySyntaxErrorLabel ) ; } // Clean up export errors. // TODO: we should really send a PR to Webpack for this. var exportError = / \s*(.+?)\s*(")?export '(.+?)' was not found in '(.+?)' / ; if ( lines [ 1 ] . match ( exportError ) ) { lines [ 1 ] = lines [ 1 ] . replace ( exportError , "$1 '$4' does not contain an export named '$3'." ) ; } lines [ 0 ] = chalk . inverse ( lines [ 0 ] ) ; // Reassemble the message. message = lines . join ( '\n' ) ; // Internal stacks are generally useless so we strip them... with the // exception of stacks containing `webpack:` because they're normally // from user code generated by WebPack. For more information see // https://github.com/facebookincubator/create-react-app/pull/1050 message = message . replace ( / ^\s*at\s((?!webpack:).)*:\d+:\d+[\s)]*(\n|$) / gm , '' ) ; // at ... ...:x:y return message . trim ( ) ; }
Cleans up webpack error messages. eslint-disable-next-line no-unused-vars
Cleans up webpack error messages . eslint - disable - next - line no - unused - vars