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'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;
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