npm and error messages

node_modules/friendly-errors-webpack-plugin/src/formatters/defaultError.js

@@ -0,0 +1,43 @@
+'use strict';
+
+const concat = require('../utils').concat;
+const formatTitle = require('../utils/colors').formatTitle;
+
+function displayError(severity, error) {
+  const baseError = formatTitle(severity, severity);
+
+  return concat(
+    `${baseError} ${removeLoaders(error.file)}`,
+    '',
+    error.message,
+    (error.origin ? error.origin : undefined),
+    '',
+    error.infos
+  );
+}
+
+function removeLoaders(file) {
+  if (!file) {
+    return "";
+  }
+  const split = file.split('!');
+  const filePath = split[split.length - 1];
+  return `in ${filePath}`;
+}
+
+function isDefaultError(error) {
+  return !error.type;
+}
+
+/**
+ * Format errors without a type
+ */
+function format(errors, type) {
+  return errors
+    .filter(isDefaultError)
+    .reduce((accum, error) => (
+      accum.concat(displayError(type, error))
+    ), []);
+}
+
+module.exports = format;

node_modules/friendly-errors-webpack-plugin/src/formatters/eslintError.js

@@ -0,0 +1,31 @@
+'use strict';
+
+const concat = require('../utils').concat;
+const chalk = require('chalk');
+
+const infos = [
+  'You may use special comments to disable some warnings.',
+  'Use ' + chalk.yellow('// eslint-disable-next-line') + ' to ignore the next line.',
+  'Use ' + chalk.yellow('/* eslint-disable */') + ' to ignore all warnings in a file.'
+];
+
+function displayError(error) {
+  return [error.message, '']
+}
+
+function format(errors, type) {
+  const lintErrors = errors.filter(e => e.type === 'lint-error');
+  if (lintErrors.length > 0) {
+    const flatten = (accum, curr) => accum.concat(curr);
+    return concat(
+      lintErrors
+        .map(error => displayError(error))
+        .reduce(flatten, []),
+      infos
+    )
+  }
+
+  return [];
+}
+
+module.exports = format;

node_modules/friendly-errors-webpack-plugin/src/formatters/moduleNotFound.js

@@ -0,0 +1,92 @@
+'use strict';
+const concat = require('../utils').concat;
+
+function isRelative (module) {
+  return module.startsWith('./') || module.startsWith('../');
+}
+
+function formatFileList (files) {
+  const length = files.length;
+  if (!length) return '';
+  return ` in ${files[0]}${files[1] ? `, ${files[1]}` : ''}${length > 2 ? ` and ${length - 2} other${length === 3 ? '' : 's'}` : ''}`;
+}
+
+function formatGroup (group) {
+  const files = group.errors.map(e => e.file).filter(Boolean);
+  return `* ${group.module}${formatFileList(files)}`;
+}
+
+
+function forgetToInstall (missingDependencies) {
+  const moduleNames = missingDependencies.map(missingDependency => missingDependency.module);
+
+  if (missingDependencies.length === 1) {
+    return `To install it, you can run: npm install --save ${moduleNames.join(' ')}`;
+  }
+
+  return `To install them, you can run: npm install --save ${moduleNames.join(' ')}`;
+}
+
+function dependenciesNotFound (dependencies) {
+  if (dependencies.length === 0) return;
+
+  return concat(
+    dependencies.length === 1 ? 'This dependency was not found:' : 'These dependencies were not found:',
+    '',
+    dependencies.map(formatGroup),
+    '',
+    forgetToInstall(dependencies)
+  );
+}
+
+function relativeModulesNotFound (modules) {
+  if (modules.length === 0) return;
+
+  return concat(
+    modules.length === 1 ? 'This relative module was not found:' : 'These relative modules were not found:',
+    '',
+    modules.map(formatGroup)
+  );
+}
+
+function groupModules (errors) {
+  const missingModule = new Map();
+
+  errors.forEach((error) => {
+    if (!missingModule.has(error.module)) {
+      missingModule.set(error.module, [])
+    }
+    missingModule.get(error.module).push(error);
+  });
+
+  return Array.from(missingModule.keys()).map(module => ({
+    module: module,
+    relative: isRelative(module),
+    errors: missingModule.get(module),
+  }));
+}
+
+function formatErrors (errors) {
+  if (errors.length === 0) {
+    return [];
+  }
+
+  const groups = groupModules(errors);
+
+  const dependencies = groups.filter(group => !group.relative);
+  const relativeModules = groups.filter(group => group.relative);
+
+  return concat(
+    dependenciesNotFound(dependencies),
+    dependencies.length && relativeModules.length ? ['', ''] : null,
+    relativeModulesNotFound(relativeModules)
+  );
+}
+
+function format (errors) {
+  return formatErrors(errors.filter((e) => (
+    e.type === 'module-not-found'
+  )));
+}
+
+module.exports = format;