diff --git a/.eslintrc-frontend.yml b/.eslintrc-frontend.yml
deleted file mode 100644
index da884feae6..0000000000
--- a/.eslintrc-frontend.yml
+++ /dev/null
@@ -1,36 +0,0 @@
-env:
-  browser: true
-
-plugins:
-  - import
-  - react-hooks
-
-parser: '@typescript-eslint/parser'
-
-parserOptions:
-  sourceType: 'module'
-
-extends:
-  - 'standard-jsx'
-  - 'standard-react'
-  - './.eslintrc.yml'
-  - 'plugin:@typescript-eslint/recommended'
-  - 'prettier/@typescript-eslint'
-
-settings:
-  react:
-    version: '16.8'
-
-rules:
-  no-console: 'error'
-
-  import/extensions: ['error', 'never', { 'json': 'always', 'yml': 'always' }]
-  react/jsx-sort-props: 'error'
-  react-hooks/rules-of-hooks: 'error'
-  react-hooks/exhaustive-deps: 'error'
-
-  '@typescript-eslint/no-unused-vars': ['error', { 'args': 'none' }]
-
-  # Argh.
-  '@typescript-eslint/explicit-function-return-type': 'off'
-  '@typescript-eslint/no-object-literal-type-assertion': 'off'
diff --git a/.eslintrc.yml b/.eslintrc.yml
index 0a28589d78..aefc96002c 100644
--- a/.eslintrc.yml
+++ b/.eslintrc.yml
@@ -1,22 +1,65 @@
 extends:
-  - standard
-  - prettier
+  - standard-jsx
+  - standard-react
   - plugin:jsdoc/recommended
-
-env:
-  node: true
-  mocha: true
+  - plugin:@typescript-eslint/recommended
+  - prettier/@typescript-eslint
+  - prettier/standard
 
 parserOptions:
   # Override eslint-config-standard, which incorrectly sets this to "module",
   # though that setting is only for ES6 modules, not CommonJS modules.
   sourceType: 'script'
 
+settings:
+  react:
+    version: '16.8'
+
+plugins:
+  - chai-friendly
+  - jsdoc
+  - mocha
+  - no-extension-in-require
+  - sort-class-members
+  - import
+  - react-hooks
+  - promise
+
 overrides:
+  # For simplicity's sake, when possible prefer to add rules to the top-level
+  # list of rules, even if they only apply to certain files. That way the
+  # rules listed here are only ones which conflict.
+
   - files:
-      - gatsby-browser.js
+      - '**/*.js'
+      - '!frontend/**/*.js'
+    env:
+      node: true
+    rules:
+      no-console: 'off'
+      '@typescript-eslint/no-var-requires': off
+
+  - files:
+      - '**/*.@(ts|tsx)'
     parserOptions:
       sourceType: 'module'
+    parser: '@typescript-eslint/parser'
+    rules:
+      # Argh.
+      '@typescript-eslint/explicit-function-return-type': 'off'
+      '@typescript-eslint/no-object-literal-type-assertion': 'off'
+
+  - files:
+      - gatsby-browser.js
+      - 'frontend/**/*.@(js|ts|tsx)'
+    parserOptions:
+      sourceType: 'module'
+    env:
+      browser: true
+    rules:
+      import/extensions:
+        ['error', 'never', { 'json': 'always', 'yml': 'always' }]
+
   - files:
       - 'core/base-service/**/*.js'
       - 'services/**/*.js'
@@ -44,25 +87,29 @@ overrides:
           },
         ]
 
-plugins:
-  - chai-friendly
-  - jsdoc
-  - mocha
-  - no-extension-in-require
-  - sort-class-members
+  - files:
+      - '**/*.spec.@(js|ts|tsx)'
+      - '**/*.integration.js'
+    env:
+      mocha: true
+    rules:
+      mocha/no-exclusive-tests: 'error'
+      mocha/no-mocha-arrows: 'error'
+      mocha/prefer-arrow-callback: 'error'
 
 rules:
   # Disable some rules from eslint:recommended.
-  no-console: 'off'
   no-empty: ['error', { 'allowEmptyCatch': true }]
+
   # Allow unused parameters. In callbacks, removing them seems to obscure
   # what the functions are doing.
-  no-unused-vars: ['error', { 'args': 'none' }]
+  '@typescript-eslint/no-unused-vars': ['error', { 'args': 'none' }]
+  no-unused-vars: off
+
+  '@typescript-eslint/no-var-requires': error
 
   # These should be disabled by eslint-config-prettier, but are not.
   spaced-comment: 'off'
-  standard/object-curly-even-spacing: 'off'
-  one-var: 'off'
 
   # Shields additions.
   no-var: 'error'
@@ -77,14 +124,17 @@ rules:
   new-cap: ['error', { 'capIsNew': true }]
   import/order: ['error', { 'newlines-between': 'never' }]
 
-  # Mocha-related.
-  mocha/no-exclusive-tests: 'error'
-  mocha/no-mocha-arrows: 'error'
-  mocha/prefer-arrow-callback: 'error'
-
   # Chai friendly.
   no-unused-expressions: 'off'
   chai-friendly/no-unused-expressions: 'error'
 
   # Disable some rules from jsdoc/recommended.
-  jsdoc/require-jsdoc: 0
+  jsdoc/require-jsdoc: off
+
+  # Disable some from TypeScript.
+  '@typescript-eslint/camelcase': off
+
+  react/jsx-sort-props: 'error'
+  react-hooks/rules-of-hooks: 'error'
+  react-hooks/exhaustive-deps: 'error'
+  jsx-quotes: ['error', 'prefer-double']
diff --git a/core/base-service/lru-cache.js b/core/base-service/lru-cache.js
index 7a4788dd97..3aacf7277d 100644
--- a/core/base-service/lru-cache.js
+++ b/core/base-service/lru-cache.js
@@ -7,6 +7,23 @@ const typeEnum = {
   heap: 1,
 }
 
+// In bytes.
+let heapSize
+function computeHeapSize() {
+  return (heapSize = process.memoryUsage().heapTotal)
+}
+
+let heapSizeTimeout
+function getHeapSize() {
+  if (heapSizeTimeout == null) {
+    // Compute the heap size every 60 seconds.
+    heapSizeTimeout = setInterval(computeHeapSize, 60 * 1000)
+    return computeHeapSize()
+  } else {
+    return heapSize
+  }
+}
+
 function CacheSlot(key, value) {
   this.key = key
   this.value = value
@@ -116,20 +133,4 @@ Cache.prototype = {
   },
 }
 
-// In bytes.
-let heapSize
-let heapSizeTimeout
-function getHeapSize() {
-  if (heapSizeTimeout == null) {
-    // Compute the heap size every 60 seconds.
-    heapSizeTimeout = setInterval(computeHeapSize, 60 * 1000)
-    return computeHeapSize()
-  } else {
-    return heapSize
-  }
-}
-function computeHeapSize() {
-  return (heapSize = process.memoryUsage().heapTotal)
-}
-
 module.exports = Cache
diff --git a/core/server/secret-is-valid.js b/core/server/secret-is-valid.js
index 49cdc27dcd..d0846a061a 100644
--- a/core/server/secret-is-valid.js
+++ b/core/server/secret-is-valid.js
@@ -2,13 +2,6 @@
 
 const serverSecrets = require('../../lib/server-secrets')
 
-function secretIsValid(secret = '') {
-  return (
-    serverSecrets.shields_secret &&
-    constEq(secret, serverSecrets.shields_secret)
-  )
-}
-
 function constEq(a, b) {
   if (a.length !== b.length) {
     return false
@@ -20,4 +13,9 @@ function constEq(a, b) {
   return zero === 0
 }
 
-module.exports = secretIsValid
+module.exports = function secretIsValid(secret = '') {
+  return (
+    serverSecrets.shields_secret &&
+    constEq(secret, serverSecrets.shields_secret)
+  )
+}
diff --git a/frontend/.eslintrc.yml b/frontend/.eslintrc.yml
deleted file mode 100644
index e3f319d833..0000000000
--- a/frontend/.eslintrc.yml
+++ /dev/null
@@ -1 +0,0 @@
-extends: '../.eslintrc-frontend.yml'
diff --git a/services/color-formatters.js b/services/color-formatters.js
index 479cf7447f..ce9fa6e78b 100644
--- a/services/color-formatters.js
+++ b/services/color-formatters.js
@@ -22,14 +22,6 @@ function version(version) {
   }
 }
 
-function downloadCount(downloads) {
-  return floorCount(downloads, 10, 100, 1000)
-}
-
-function coveragePercentage(percentage) {
-  return floorCount(percentage, 80, 90, 100)
-}
-
 function floorCount(value, yellow, yellowgreen, green) {
   if (value <= 0) {
     return 'red'
@@ -44,6 +36,14 @@ function floorCount(value, yellow, yellowgreen, green) {
   }
 }
 
+function downloadCount(downloads) {
+  return floorCount(downloads, 10, 100, 1000)
+}
+
+function coveragePercentage(percentage) {
+  return floorCount(percentage, 80, 90, 100)
+}
+
 function letterScore(score) {
   if (score === 'A') {
     return 'brightgreen'
diff --git a/services/jsdelivr/jsdelivr-hits-github.service.js b/services/jsdelivr/jsdelivr-hits-github.service.js
index fcffb66419..881f99f034 100644
--- a/services/jsdelivr/jsdelivr-hits-github.service.js
+++ b/services/jsdelivr/jsdelivr-hits-github.service.js
@@ -2,7 +2,7 @@
 
 const { schema, periodMap, BaseJsDelivrService } = require('./jsdelivr-base')
 
-module.exports = class jsDelivrHitsGitHub extends BaseJsDelivrService {
+module.exports = class JsDelivrHitsGitHub extends BaseJsDelivrService {
   static get route() {
     return {
       base: 'jsdelivr/gh',
diff --git a/services/jsdelivr/jsdelivr-hits-npm.service.js b/services/jsdelivr/jsdelivr-hits-npm.service.js
index 96a5787fde..87af8aca11 100644
--- a/services/jsdelivr/jsdelivr-hits-npm.service.js
+++ b/services/jsdelivr/jsdelivr-hits-npm.service.js
@@ -2,7 +2,7 @@
 
 const { schema, periodMap, BaseJsDelivrService } = require('./jsdelivr-base')
 
-module.exports = class jsDelivrHitsNPM extends BaseJsDelivrService {
+module.exports = class JsDelivrHitsNPM extends BaseJsDelivrService {
   static get route() {
     return {
       base: 'jsdelivr/npm',
diff --git a/services/version.js b/services/version.js
index b1d61191dc..e13623f3fb 100644
--- a/services/version.js
+++ b/services/version.js
@@ -11,6 +11,61 @@ const semver = require('semver')
 const { addv } = require('./text-formatters')
 const { version: versionColor } = require('./color-formatters')
 
+function listCompare(a, b) {
+  const alen = a.length,
+    blen = b.length
+  for (let i = 0; i < alen; i++) {
+    if (a[i] < b[i]) {
+      return -1
+    } else if (a[i] > b[i]) {
+      return 1
+    }
+  }
+  return alen - blen
+}
+
+// Take string versions.
+// -1 if v1 < v2, 1 if v1 > v2, 0 otherwise.
+function compareDottedVersion(v1, v2) {
+  const parts1 = /([0-9.]+)(.*)$/.exec(v1)
+  const parts2 = /([0-9.]+)(.*)$/.exec(v2)
+  if (parts1 != null && parts2 != null) {
+    const numbers1 = parts1[1]
+    const numbers2 = parts2[1]
+    const distinguisher1 = parts1[2]
+    const distinguisher2 = parts2[2]
+    const numlist1 = numbers1.split('.').map(e => +e)
+    const numlist2 = numbers2.split('.').map(e => +e)
+    const cmp = listCompare(numlist1, numlist2)
+    if (cmp !== 0) {
+      return cmp
+    } else {
+      return distinguisher1 < distinguisher2
+        ? -1
+        : distinguisher1 > distinguisher2
+        ? 1
+        : 0
+    }
+  }
+  return v1 < v2 ? -1 : v1 > v2 ? 1 : 0
+}
+
+// Take a list of string versions.
+// Return the latest, or undefined, if there are none.
+function latestDottedVersion(versions) {
+  const len = versions.length
+  if (len === 0) {
+    return
+  }
+  let version = versions[0]
+  for (let i = 1; i < len; i++) {
+    if (compareDottedVersion(version, versions[i]) < 0) {
+      version = versions[i]
+    }
+  }
+  return version
+}
+
 // Given a list of versions (as strings), return the latest version.
 // Return undefined if no version could be found.
 function latest(versions, { pre = false } = {}) {
@@ -45,63 +100,6 @@ function latest(versions, { pre = false } = {}) {
   return version
 }
 
-function listCompare(a, b) {
-  const alen = a.length,
-    blen = b.length
-  for (let i = 0; i < alen; i++) {
-    if (a[i] < b[i]) {
-      return -1
-    } else if (a[i] > b[i]) {
-      return 1
-    }
-  }
-  return alen - blen
-}
-
-// === Private helper functions ===
-
-// Take a list of string versions.
-// Return the latest, or undefined, if there are none.
-function latestDottedVersion(versions) {
-  const len = versions.length
-  if (len === 0) {
-    return
-  }
-  let version = versions[0]
-  for (let i = 1; i < len; i++) {
-    if (compareDottedVersion(version, versions[i]) < 0) {
-      version = versions[i]
-    }
-  }
-  return version
-}
-
-// Take string versions.
-// -1 if v1 < v2, 1 if v1 > v2, 0 otherwise.
-function compareDottedVersion(v1, v2) {
-  const parts1 = /([0-9.]+)(.*)$/.exec(v1)
-  const parts2 = /([0-9.]+)(.*)$/.exec(v2)
-  if (parts1 != null && parts2 != null) {
-    const numbers1 = parts1[1]
-    const numbers2 = parts2[1]
-    const distinguisher1 = parts1[2]
-    const distinguisher2 = parts2[2]
-    const numlist1 = numbers1.split('.').map(e => +e)
-    const numlist2 = numbers2.split('.').map(e => +e)
-    const cmp = listCompare(numlist1, numlist2)
-    if (cmp !== 0) {
-      return cmp
-    } else {
-      return distinguisher1 < distinguisher2
-        ? -1
-        : distinguisher1 > distinguisher2
-        ? 1
-        : 0
-    }
-  }
-  return v1 < v2 ? -1 : v1 > v2 ? 1 : 0
-}
-
 // Slice the specified number of dotted parts from the given semver version.
 // e.g. slice('2.4.7', 'minor') -> '2.4'
 function slice(v, releaseType) {