refactor: enable and fix fp/no-loops

.eslintrc.js

@@ -18,7 +18,7 @@ module.exports = {
     'fp/no-delete': 0,
     'fp/no-get-set': 0,
     'fp/no-let': 0,
-    'fp/no-loops': 0,
+    'fp/no-loops': 'error',
     'fp/no-mutating-assign': 0,
     'fp/no-mutating-methods': 0,
     'fp/no-mutation': 0,
@@ -28,7 +28,6 @@ module.exports = {
     'node/no-sync': 0,
     'unicorn/prefer-spread': 0,
     'unicorn/consistent-destructuring': 0,
-
     // TODO: harmonize with filename snake_case in other Netlify Dev projects
     'unicorn/filename-case': [2, { case: 'kebabCase' }],
   },
@@ -55,6 +54,7 @@ module.exports = {
         'node/no-unsupported-features/es-syntax': 0,
         'unicorn/consistent-destructuring': 0,
         'max-lines': 0,
+        'array-callback-return': ['error', { checkForEach: true }],
       },
     },
     // Example functions

src/commands/env/import.js

@@ -64,9 +64,7 @@ class EnvImportCommand extends Command {
     const table = new AsciiTable(`Imported environment variables`)
 
     table.setHeading('Key', 'Value')
-    for (const [key, value] of Object.entries(importedEnv)) {
-      table.addRow(key, value)
-    }
+    table.addRowMatrix(Object.entries(importedEnv))
     this.log(table.toString())
   }
 }

src/commands/env/list.js

@@ -39,9 +39,7 @@ class EnvListCommand extends Command {
     const table = new AsciiTable(`Environment variables`)
 
     table.setHeading('Key', 'Value')
-    for (const [key, value] of Object.entries(environment)) {
-      table.addRow(key, value)
-    }
+    table.addRowMatrix(Object.entries(environment))
     this.log(table.toString())
   }
 }

src/commands/init.js

@@ -6,7 +6,7 @@ const isEmpty = require('lodash/isEmpty')
 
 const Command = require('../utils/command')
 const { getRepoData } = require('../utils/get-repo-data')
-const { ensureNetlifyIgnore } = require('../utils/gitignore')
+const ensureNetlifyIgnore = require('../utils/gitignore')
 const { configureRepo } = require('../utils/init/config')
 const { track } = require('../utils/telemetry')
 

src/commands/link.js

@@ -6,7 +6,7 @@ const chalk = require('chalk')
 
 const { listSites } = require('../lib/api')
 const Command = require('../utils/command')
-const { ensureNetlifyIgnore } = require('../utils/gitignore')
+const ensureNetlifyIgnore = require('../utils/gitignore')
 const linkPrompt = require('../utils/link/link-by-prompt')
 const { track } = require('../utils/telemetry')
 

src/detectors/utils/jsdetect.js

@@ -33,22 +33,12 @@ const getYarnOrNPMCommand = function () {
 
 const hasRequiredDeps = function (requiredDepArray) {
   const { dependencies, devDependencies } = getPkgJSON()
-  for (const depName of requiredDepArray) {
-    const hasItInDeps = dependencies && dependencies[depName]
-    const hasItInDevDeps = devDependencies && devDependencies[depName]
-    if (!hasItInDeps && !hasItInDevDeps) {
-      return false
-    }
-  }
-  return true
+  const allDependencies = { ...dependencies, ...devDependencies }
+  return requiredDepArray.every((depName) => allDependencies[depName])
 }
+
 const hasRequiredFiles = function (filenameArr) {
-  for (const filename of filenameArr) {
-    if (!existsSync(filename)) {
-      return false
-    }
-  }
-  return true
+  return filenameArr.every((filename) => existsSync(filename))
 }
 
 // preferredScriptsArr is in decreasing order of preference

src/lib/functions/runtimes/js/builders/netlify-lambda.js

@@ -14,6 +14,7 @@ const detectNetlifyLambda = async function ({ packageJson } = {}) {
 
   const matchingScripts = Object.entries(scripts).filter(([, script]) => script.match(/netlify-lambda\s+build/))
 
+  // eslint-disable-next-line fp/no-loops
   for (const [key, script] of matchingScripts) {
     // E.g. ["netlify-lambda", "build", "functions/folder"]
     const match = minimist(script.split(' '))

src/lib/functions/synchronous.js

@@ -2,6 +2,16 @@ const { Buffer } = require('buffer')
 
 const { NETLIFYDEVERR } = require('../../utils/logo')
 
+const addHeaders = (headers, response) => {
+  if (!headers) {
+    return
+  }
+
+  Object.entries(headers).forEach(([key, value]) => {
+    response.setHeader(key, value)
+  })
+}
+
 const handleSynchronousFunction = function (err, result, response) {
   if (err) {
     return handleErr(err, response)
@@ -14,13 +24,9 @@ const handleSynchronousFunction = function (err, result, response) {
   }
 
   response.statusCode = result.statusCode
-  for (const key in result.headers) {
-    response.setHeader(key, result.headers[key])
-  }
-  for (const key in result.multiValueHeaders) {
-    const items = result.multiValueHeaders[key]
-    response.setHeader(key, items)
-  }
+  addHeaders(result.headers, response)
+  addHeaders(result.multiValueHeaders, response)
+
   if (result.body) {
     response.write(result.isBase64Encoded ? Buffer.from(result.body, 'base64') : result.body)
   }

src/utils/detect-functions-builder.js

@@ -12,6 +12,7 @@ const detectFunctionsBuilder = async function (parameters) {
     // eslint-disable-next-line node/global-require, import/no-dynamic-require
     .map((det) => require(path.join(buildersPath, det)))
 
+  // eslint-disable-next-line fp/no-loops
   for (const detector of detectors) {
     // eslint-disable-next-line no-await-in-loop
     const settings = await detector(parameters)

src/utils/detect-server.js

@@ -58,7 +58,6 @@ const serverSettings = async (devConfig, flags, projectDir, log) => {
       }
     })
   } else if (devConfig.framework === '#auto' && !(devConfig.command && devConfig.targetPort)) {
-    const settingsArr = []
     const detectors = detectorsFiles.map((det) => {
       try {
         return loadDetector(det)
@@ -67,10 +66,8 @@ const serverSettings = async (devConfig, flags, projectDir, log) => {
         return null
       }
     })
-    for (const detector of detectors) {
-      const detectorResult = detector(projectDir)
-      if (detectorResult) settingsArr.push(detectorResult)
-    }
+
+    const settingsArr = detectors.map((detector) => detector(projectDir)).filter((el) => el)
     if (settingsArr.length === 1) {
       const [firstSettings] = settingsArr
       settings = firstSettings

src/utils/dev.js

@@ -135,24 +135,25 @@ const injectEnvVariables = async ({ env, log, site, warn }) => {
   const environment = new Map(Object.entries(env))
   const dotEnvFiles = await loadDotEnvFiles({ projectDir: site.root, warn })
 
-  for (const { file, env: fileEnv } of dotEnvFiles) {
-    for (const key in fileEnv) {
+  dotEnvFiles.forEach(({ file, env: fileEnv }) => {
+    Object.keys(fileEnv).forEach((key) => {
       const newSourceName = `${file} file`
       const sources = environment.has(key) ? [newSourceName, ...environment.get(key).sources] : [newSourceName]
 
       environment.set(key, {
         sources,
         value: fileEnv[key],
       })
-    }
-  }
+    })
+  })
 
+  // eslint-disable-next-line fp/no-loops
   for (const [key, variable] of environment) {
     const existsInProcess = process.env[key] !== undefined
     const [usedSource, ...overriddenSources] = existsInProcess ? ['process', ...variable.sources] : variable.sources
     const usedSourceName = getEnvSourceName(usedSource)
 
-    for (const source of overriddenSources) {
+    overriddenSources.forEach((source) => {
       const sourceName = getEnvSourceName(source)
 
       log(
@@ -162,7 +163,7 @@ const injectEnvVariables = async ({ env, log, site, warn }) => {
           )} (defined in ${usedSourceName})`,
         ),
       )
-    }
+    })
 
     if (!existsInProcess) {
       // Omitting `general` env vars to reduce noise in the logs.

src/utils/get-global-config.js

@@ -30,6 +30,7 @@ const getGlobalConfigOnce = async function () {
 
 const getGlobalConfig = async function () {
   const retries = 3
+  // eslint-disable-next-line fp/no-loops
   for (let retry = 1; retry <= retries; retry++) {
     try {
       // eslint-disable-next-line no-await-in-loop

src/utils/get-global-config.test.js

@@ -68,7 +68,6 @@ test.serial("should create config in netlify's config dir if none exists and sto
   // Remove config dirs
   await rmdirRecursiveAsync(getPathInHome([]))
   await rmdirRecursiveAsync(getLegacyPathInHome([]))
-
   const globalConfig = await getGlobalConfig()
   globalConfig.set('newProp', 'newValue')
   const configFile = JSON.parse(await readFileAsync(configPath))

src/utils/gitignore.js

@@ -10,69 +10,6 @@ const hasGitIgnore = async function (dir) {
   return hasIgnore
 }
 
-const parser = function (input, fn = (line) => line) {
-  const lines = input.toString().split(/\r?\n/)
-  let section = { name: 'default', patterns: [] }
-  const state = { patterns: [], sections: [section] }
-
-  for (const line of lines) {
-    if (line.charAt(0) === '#') {
-      section = { name: line.slice(1).trim(), patterns: [] }
-      state.sections.push(section)
-      continue
-    }
-
-    if (line.trim() !== '') {
-      const pattern = fn(line, section, state)
-      section.patterns.push(pattern)
-      state.patterns.push(pattern)
-    }
-  }
-  return state
-}
-
-const stringify = function (state) {
-  return parseIgnore.stringify(state.sections, (section) => {
-    if (section.patterns.length === 0) {
-      return ''
-    }
-
-    return `# ${section.name}\n${section.patterns.join('\n')}\n\n`
-  })
-}
-
-const parse = function (input, fn) {
-  const state = parser(input, fn)
-
-  state.concat = (stateInput) => {
-    const newState = parser(stateInput, fn)
-
-    for (const s2 in newState.sections) {
-      const sec2 = newState.sections[s2]
-
-      let sectionExists = false
-      for (const s1 in state.sections) {
-        const sec1 = state.sections[s1]
-
-        // Join sections under common name
-        if (sec1.name === sec2.name) {
-          sectionExists = true
-          sec1.patterns = [...new Set(sec1.patterns.concat(sec2.patterns))]
-        }
-      }
-
-      // Add new section
-      if (!sectionExists) {
-        state.sections.push(sec2)
-      }
-    }
-
-    return state
-  }
-
-  return state
-}
-
 const ensureNetlifyIgnore = async function (dir) {
   const gitIgnorePath = path.join(dir, '.gitignore')
   const ignoreContent = '# Local Netlify folder\n.netlify'
@@ -98,9 +35,4 @@ const ensureNetlifyIgnore = async function (dir) {
   }
 }
 
-module.exports = {
-  parse,
-  stringify,
-  format: parseIgnore.format,
-  ensureNetlifyIgnore,
-}
+module.exports = ensureNetlifyIgnore

src/utils/headers.js

@@ -86,6 +86,7 @@ const parseHeadersFile = function (filePath) {
 
   let path
   let rules = {}
+  // eslint-disable-next-line fp/no-loops
   for (const { line, index } of lines) {
     if (line.startsWith(TOKEN_PATH)) {
       path = line

src/utils/state-config.js

@@ -84,9 +84,9 @@ class StateConfig {
     const config = this.all
 
     if (args.length === 1) {
-      for (const keyPart of Object.keys(key)) {
-        dotProp.set(config, keyPart, key[keyPart])
-      }
+      Object.entries(key).forEach(([keyPart, value]) => {
+        dotProp.set(config, keyPart, value)
+      })
     } else {
       dotProp.set(config, key, val)
     }

tests/utils/dev-server.js

@@ -71,6 +71,7 @@ const startServer = async ({ cwd, offline = true, env = {}, args = [] }) => {
 
 const startDevServer = async (options, expectFailure) => {
   const maxAttempts = 5
+  // eslint-disable-next-line fp/no-loops
   for (let attempt = 1; attempt <= maxAttempts; attempt++) {
     try {
       // eslint-disable-next-line no-await-in-loop

tests/utils/site-builder.js

@@ -150,6 +150,7 @@ const createSiteBuilder = ({ siteName }) => {
       return builder
     },
     buildAsync: async () => {
+      // eslint-disable-next-line fp/no-loops
       for (const task of tasks) {
         // eslint-disable-next-line no-await-in-loop
         await task()